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Palynological assemblages from the Majaditas Formation (Carboniferous), Argentina: An example of reworking in glacial sediments J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-04-10 Silvia N. Césari, Carlos O. Limarino, María F. Gaido, Marcelo Cegarra, Gabriela Anselmi
Reworked palynomorphs are commonly found in sedimentary deposits of glacial environments. However, instances of reworking were few times identified in the Carboniferous assemblages of central-western Argentina. In this study, two well-preserved palynological assemblages recovered from shales bearing dropstones of the Majaditas Formation in San Juan province are described for the first time. The palynoflora
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A new metatherian (Mammalia) from the Itaboraí basin (Early Eocene), Brazil: Implications to trophic niche partitioning between large-sized “didelphoid-like” metatherians J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-04-09 L.M. Carneiro, H. Bampi, C.C. Rangel, B.M.G. Guimarães, R.C. Silva, É.V. Oliveira
The Itaboraí Basin, municipality of Itaboraí, Rio de Janeiro state, Brazil, preserved an Early Eocene vertebrate assemblage. Among its representatives, Metatheria comprises its most diverse clade, with a minimum of 29 genera and 43 species. Considering this diversity, large-sized taxa (based on didelphid standards, i.e., between 1 kg and 3.3 kg) are represented by , and , each considered to have explored
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Representatives of the order Pilosa and Cingulata, Furna do Cazuza (Pleistocene-Holocene), Paripiranga, Bahia, Northeastern Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-04-05 Johnson Sarmento de Oliveira Nascimento, Jorge Luiz Lopes da Silva, Paula Sucerquia
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Holocene sedimentary processes in the Turbio river valley (Chile, 30°S): Paleoclimatic implications for the semi-arid Andes J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-04-04 M. San Juan, T. Villaseñor, V. Flores-Aqueveque, E. Honores, S. Moreiras, J.L. Antinao, A. Maldonado
The Holocene sedimentary history of the Turbio River valley in semi-arid north-central Chile and its relationship to climate variability is presented in this study. Fluvial landforms and sedimentary deposits serve as essential records for studying the long-term dynamics of fluvial systems in response to external factors such as tectonic and climatic influences. The study area, located in the Andean
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Characterization of subaerial lava flows of the presalt strata in the Santos Basin based on basic well logs J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-04-01 Filipe Vidal Cunha Santa Rosa Soares de Oliveira, Isabela de Oliveira Carmo, Juliana Costa, Bruno Tosta Bittencourt, Wagner Moreira Lupinacci, Antonio Fernando Menezes Freire
It is hard to identify volcanic morphologies using well logs to support technical decisions during well drilling and the acquisition of geological information. Therefore, this study was carried out on the volcanic sequence present in the Presalt interval of the Santos Basin, Brazil, which is referred to as the Camboriú Formation. This section was described in a previous study using image well logs
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Sedimentary facies and palynoflora of the Andirá and Arari formations in the Autazes region, Amazonas Basin J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-30 Ziomar Costa e Silva Junior, Emílio Alberto Amaral Soares, Rodolfo Dino, Luzia Antonioli
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Neoproterozoic lithospheric structures at the Borborema Province: Integration of magnetotelluric resistivity sections and their relations to neighboring lithospheric blocks of the Parnaíba Basin and São Francisco Craton J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-29 Roberto Gonçalves de Souza Filho, José Carlos Sícoli Seoane
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Volcano tectonic setting of the Salares Norte Au–Ag epithermal belt, central Andes of northern Chile J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-28 J. Clavero, P. Pérez-Flores, F. Rojas, D. Huete-Verdugo, B. Droguett, V. Ramírez
The Salares Norte (SN) Au–Ag belt is here defined as an Upper Miocene-Pliocene metallogenic area, extending for nearly 200 km, located NE of the northern end of the Upper Oligocene-Lower Miocene Maricunga Belt in the central Andes of northern Chile. The belt is located just east of the main reverse NS fault systems which are part of the Sierra Castillo, Potrerillos Mine and Claudio Gay Cordillera faults
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Shear zone-hosted hypogene high-grade iron deposit: The Cuité case study J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-26 Flávia Cristina Silveira Braga, Carlos Alberto Rosière, João Orestes Schneider Santos, Igor Vasconcelos Santana
The Cuité iron ore deposit consists of high-grade schistose lenses (>60 wt% Fe) hosted in a tectonic sliver of iron formation associated to mica schist (Serra da Serpentina Group). It is located at the southeastern border of the São Francisco Craton, enclosed by sheared Sthaterian granitoids (Borrachudos Suite), Neoarchean ortogneiss (Guanhães Complex), quartz and pegmatite veins. The iron formation
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New Silurian craniopsids (Brachiopoda, Craniiformea) from the Precordillera basin of western Argentina and their associated faunas J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-24 Juan L. Benedetto, Fernando J. Lavié, María J. Salas
The craniopsid brachiopod is reported for the first time from the Silurian of the Precordillera basin of West-Central Argentina. It is represented by two new species, , from the lower part of the Los Espejos Formation (lower Ludlow), and , from the upper part of the same formation (Ludfordian-Pridoli). The fauna comes from laminated mudstones and bioturbated siltstones indicating outer-shelf deposition
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Climatic variation of the last 29.000 years BP in the northern Santos basin (Rio de Janeiro Shelf) inferred by an alternation of cysts Tuberculodinium vancampoae and Operculodiniumcentrocarpum J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-23 Taísa Souza, Javier Helenes, Marcelo Araujo Carvalho, Cintia Ferreira Barreto, José Antônio Baptista Neto
During the transition from the Pleistocene to the Holocene, significant changes occurred on the Brazilian continental shelf. In this study, we investigated the environmental changes that occurred during this period through the quantification and classification of cosmopolitan dinoflagellate cysts. We used three cores collected in the northern part of the Santos Basin and analyzed a total of 42 samples
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Palynological, palynofaciological and organic geochemistry analysis of oligocene microclastics sediments from the tremembé formation - São Paulo State, Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-15 Raquel Barbosa Xavier Nicolau, Luzia Antonioli, Rodolfo Dino, Helena Antunes Portela, Giovanni de Oliveira Eneas
Samples of outcrops from the mining companies Extrativa Santa Fé Ltda and Aligra - Indústria e Comércio de Argila Ltda provided the base material for this investigation into palynological, palynofaciological and organic geochemistry analyses of the Taubaté Basin, São Paulo State. The sediments belong to the Tremembé Formation and comprise microclastic rocks. The Tremembé Formation is known for its
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Dynamic re-sedimentation of lacustrine carbonates in the Búzios Field, pre-salt section of Santos Basin, Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-15 Sabrina D. Altenhofen, Amanda G. Rodrigues, Leonardo Borghi, Luiz F. De Ros
The huge oil accumulations in the South Atlantic Pre-Salt section have driven studies that seek a greater understanding of the origin and evolution of these important reservoirs. Lacustrine carbonate intraclastic deposits correspond to the main reservoirs in the Búzios Field, currently with the highest daily production wells in the world, and in other Santos Basin fields. However, few studies were
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Organic geochemistry and palynofacies of the Devonian: A correlation between Paraná and Parnaíba basins, Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-14 Lauro Tiago Souza Santos, Jucelino Balbino da Silva Júnior, José Roberto Cerqueira, Consuelo Navarro Lima de Andrade, Luciele Sá Mascarenhas, Hélio Jorge Severiano Ribeiro, Karina Santos Garcia, Antônio Fernando de Souza Queiroz
A study on the characterization of the depositional paleoenvironment and the potentiality for hydrocarbon generation was carried out in Praguian-Emsian shale samples from Ponta Grossa Formation using data from organic geochemistry and palynofacies. The shales of the Ponta Grossa Formation presented contents of total organic carbon (TOC) with values up to 1.82%, poor to medium hydrocarbons source potential
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Long-term responses of maar lakes water level to climate and groundwater variability in central Mexico J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-14 Raúl A. Silva-Aguilera, Oscar Escolero, Javier Alcocer, Alex Correa Metrio, Gloria Vilaclara, Socorro Lozano García
Besides water level (WL) variability, several lakes worldwide have shown water level decline trends and total desiccation. In maar lakes, there is paleoenvironmental evidence of water level responses to climate and groundwater inflow changes; however, historical studies are scarce. Understanding the relative contributions of natural variability and anthropogenic impacts to the decline of lakes' water
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Paleoenvironmental, paleontological, magmatic and tectonic evolution of the Mio-Pleistocene Andean Basins in Southern South America J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-13 Patricia L. Ciccioli, Carlos O. Limarino, Sergio A. Marenssi
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A window on the lithospheric mantle beneath the eastern Trans-Mexican volcanic belt: Insights from pargasite-bearing mantle xenocrysts from the Holocene Ocotenco maar volcano J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-12 Federico Lucci, Jaime Alberto Cavazos-Alvarez, John Charles White, Giovanni Sosa-Ceballos, Daniela Ruospo, Noemí Salazar Hermenegildo, Dario Torres-Sánchez, Gerardo Carrasco-Núñez
In this short communication, we report and discuss for the first time the occurrence of pargasite-bearing pyroxenite mantle macro-xenocrysts in a basaltic-andesite juvenile material erupted from the Holocene Ocotenco maar at the Serdán-Oriental Basin Volcanic field, situated in the eastern sector of the Trans-Mexican Volcanic Belt. Through an integrated approach based on microtextural observations
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Palynological data from the hauterivian Avilé Member, Pampa Tril section, Agrio Formation, Neuquén Basin, Argentina J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-11 Mercedes B. Prámparo, Gonzalo D. Veiga
The present contribution provides data to the palynological characterization of the non-marine deposits of the Avilé Member, Agrio Formation (Pampa Tril and San Eduardo sections), Neuquén Basin, Argentina. The Avilé Member, which represent a low-order regressive event, is one of the most important hydrocarbon reservoirs in the subsurface of the eastern part of the basin. A continental palynological
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Multistage mineralizing episodes of the Proterozoic world-class Volta Grande gold deposit, Amazonian Craton, northern Brazil: Implications for the Bacajá Domain metallogenesis J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-08 Hugo Paiva Tavares de Souza, Carlos Marcello Dias Fernandes, Ricardo de Freitas Lopes, Stéphane Amireault, Raquel Souza da Cruz Saraiva, Brenda Gomes Silva Paresqui
The easternmost region of the Amazonian Craton in northern Brazil has been the focus of several mining exploration surveys, which led to the identification of the world-class Volta Grande gold deposit (∼6.0 Moz@1.02 g/t). The deposit is inserted in the Bacajá Domain (2.24–2.0 Ga), and part of the mineralization occurs in Proterozoic mylonite, gneiss, and associated metamafic rocks that underwent greenschist
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Ostracods response to environmental anthropogenic disruption in a neotropical karstic lake in southern Mexico J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-06 C.M. Chávez-Lara, M. Caballero-Miranda, B. Prado
Ostracods are sensitive to environmental changes and represent a powerful tool to assess anthropogenic impact such as land use changes and deforestation. In this work we present ostracod, ephippia, diatom and geochemical data of Lake San Lorenzo sediments dating from 1956 to 2013. The ostracod assemblage consists of , , and an unidentified species. This Unknown species rapidly adapted to the new environmental
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Chemostratigraphic correlation of Devonian-Carboniferous sedimentary sequences at Roboré SUB-BASIN, Bolivia J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-05 G.J. Garbán, H. Ostera, R. Mayta
A chemostratigraphic analysis was performed on cutting samples from Devonian-Carboniferous intervals belonging to three wells located in the Roboré sub-Basin, east of Chaco Plain, southeast Bolivia.
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Neoarchean magmatism and Rhyacian reworking in the northeast of the Amapá Block, southeastern Guiana Shield, Brazil: Geochemistry, U–Pb geochronology, and Hf–Nd isotopes J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-03 João Alberto Evangelista Pinto, Jean Michel Lafon, João Marinho Milhomem Neto
This study investigates the age, geochemical nature, sources, and Rhyacian reworking of the Neoarchean magmatism at the northeastern portion of the Amapá Block, southeastern Guiana Shield (northeast Amazonian Craton). This block consists of a large Archean continental landmass strongly reworked during the Transamazonian orogeny (2.26–1.95 Ga). We provide the very first geochemical results for Archean
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Comments on Palanisamy et al. (2024) “Spatio-temporal analysis of shoreline changes and future forecast using remote sensing, GIS and kalman filter model: A case study of Rio de Janeiro, Brazil” J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-02 João Wagner Alencar Castro, Daniel Fernandes, Willian Cruz Gouvea Junior, Frederico Maciel Pinheiro Sampaio de Miranda, Lucas Lavo Antonio Jimo Miguel
This work presents a comment on the paper “Spatio-temporal analysis of shoreline changes and future forecast using remote sensing, GIS and Kalman filter model: A case study of Rio de Janeiro, Brazil”. Results obtained by Palanisamy et al. (2023) differ from other works on the coastline of Rio de Janeiro. Images from the Landsat 1–3 Multispectral Scanner (MSS) satellite and Landsat 5–9 images were inappropriately
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A new fossil species of a liverwort of the Frullania genus (Frullaniaceae, Marchantiophyta) from the Miocene amber of Simojovel de Allende, Chiapas, Mexico J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-01 Catalina Juárez-Martínez, Víctor Manuel Córdova-Tabares, Emilio Estrada-Ruiz
The fossil record based on liverworts in Mexico remains poorly studied. To date, they have been documented only in Miocene amber deposits from Chiapas, southern Mexico. From this same amberiferous locality, here we described a new fossil species belonging to the genus. This plant is characterized by irregular, terminal branching of the type. Lobes obliquely oblong-rounded with rounded apex, sometimes
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Pleistocene–Holocene climatic events on the inner coastal plain of southernmost Brazil in relation to marine isotopic stages J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-03-01 Veridiana Ribeiro, Margot Guerra-Sommer, Rualdo Menegat, Jefferson Cardia Simões, Lidia Aumond Kuhn, Eduardo Guimarães Barboza, Gabrielli Teresa Gadens Marcon
The reconstruction of climatic conditions through continental records controlled by radiometric dating in a single columnar profile from Águas Claras peatland (30°06′24.39″ S; 50°49′04.90″) in the inner portion of the coastal plain of in Rio Grande do Sul State, Brazil (CPRS) within the Late Pleistocene/Holocene (38,900–38,155 cal yr B.P. to 1590–1515 cal yr B.P.) allow conjecturing that the continental
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Origin and evolution of shallowing-upward clastic successions: A case example from the Lower Cretaceous Agrio Formation, Neuquén Basin, Argentina J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-29 Ainara Irastorza, Carlos Zavala, Débora Mical Campetella, Martin Turienzo, Natalia Sánchez, Trinidad Durán, Gaspar Peñalva
Shallowing-upward clastic successions are very common in ancient shelfal systems. These deposits are commonly described as “parasequences” controlled by high-frequency sea-level changes. Nevertheless, the real significance of these parasequences in terms of depositional environments is controversial. This contribution discusses the origin of shallowing-upward successions from the middle-late Hauterivian
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Living benthic foraminifera and organic matter compounds as proxies to characterize the trophic state in an impacted hypersaline environment: Araruama Lagoon - Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-27 Lazaro Laut, Amanda Vilar, Thiago Carelli, Julia Sambugaro, Maria Virginia Alves Martins, Pierre Belart, Luiz Fontana, Vanessa Laut
Recognizing the tolerance levels of foraminifera species towards organic matter components is a crucial aspect of biomonitoring in diverse coastal environments, including hypersaline ecosystems. Despite the importance of this information, there remains limited knowledge about the biodiversity and ecological relationships of these organisms in hypersaline environments, hindering their application in
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Aptian-Albian paleoenvironmental geochemistry: Araripe Basin, Northeastern Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-27 Igor Hamid Ribeiro Azevedo, Luiz Drude Lacerda, Antônio Álamo Feitosa Saraiva, Alcides Nóbrega Sial, Ana Paula Aquino Benigno, José Edvar Aguiar
The geochemical record of the early Aptian and the transition to the Albian exposes the presence of Hg/TOC anomalies, revealing the interference of LIPs in paleoenvironmental changes in the Araripe basin. Redox-sensitive (V, Fe, Cr, Mn, Pb, V/Cr, V/V + Ni and V/Ni) and paleoproductivity (Cu, Zn, Ni and Ba) proxies in the Santana Group (Barbalha, Crato and Romualdo formations) indicate conditions ranging
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Characterization of seismicity and precursor monitoring in northern Baja California using RESNOM data J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-27 F. Alejandro Nava Pichardo, Lenin Ávila-Barrientos, M. Alejandra Nuñez-Leal, Luis H. Mendoza Garcilazo
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Geochemical and isotopic evidence for early neoproterozoic (ca. 1000 Ma) subduction-related magmatism in the central Borborema Province, Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-27 Mariana S. Paixão, Lauro Cézar M. Lira Santos, Elton L. Dantas, Peter A. Cawood
Early Neoproterozoic (1000-920 Ma) rocks related to the Cariris Velhos event in the central Borborema Province have been linked to either continental rifting or accretionary-collisional orogenesis. The Serra do Jatobá Suite is located in the southwestern part of the Alto Pajeú Terrane along with coeval metasedimentary sequences and Ediacaran granites. This suite is composed of alkali-calcic, meta-to
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Upper Cretaceous Crustacea from Central Cuba J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-24 Francisco J. Vega, Torrey Nyborg, Alessandro Garassino, Giovanni Pasini, Javier Aguilar-Pérez, Carlos R. Borges-Sellén, Alberto F. Arano-Ruiz, Servilio J. Quintero-Vázquez, Roberto Manuel Gutiérrez-Domech
We report new occurrences and additions to previously described species of decapod crustaceans from the Late Cretaceous (Campanian-Maastrichtian) of Cuba. Three of the eight species herein described and illustrated were published previously: Arano-Ruiz et al.2018; Vega et al., 2020; and Vega et al., 2021; however additional specimens are included. New records include one indeterminate lobster, two
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Lithofacies association and stratigraphy of the Quixaba and Remédios formations, Fernando de Noronha archipelago, Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-24 Maria Clara Parreira Murta, Antônio Gilberto Costa, Fábio Soares de Oliveira
This paper is the first ever written about aspects of the Physical volcanology of the Fernando de Noronha Archipelago, Brazil. It contributes to the understanding of the evolution of the volcanism that occurred in the Archipelago between ∼12 and ∼1.2 Ma, and of the South Atlantic Ocean. The conclusions of our study are:
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Evidence of Siderian juvenile-like contribution to the continental arc magmatism in the Western Guanambi-Correntina block, São Francisco Craton (Brazil) J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-23 Guilherme Bozelli Pontes, Mahyra Tedeschi, Humberto Reis, Henrique Bruno, Cristiano Lana, Cláudio de Morrison Valeriano
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Provenance of volcano-sedimentary features using tourmaline and REE compositional analysis, in the Paraná Basin, southern Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-22 Isaque C. Rodrigues, Ana M.P. Mizusaki, Glaucia N. Queiroga, Cassiana R.L. Michelin, Fernando R. Rios
The present research focuses on sediments' compositional analysis, in the Paraná Basin, to demonstrate provenance contributions for the volcano-sedimentary features distributed along three regions of the Basin's border. In this context, the analyzed sediments, which are generally attributed to the Botucatu Formation, interact with volcanic lava flows from the Serra Geral Formation, establishing a volcano-sedimentary
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Three-stage, 70 Myr exhumation of HP/LT rocks on Margarita, Venezuela: Caribbean intra-forearc shear, Grenada Basin rifting, and continental obduction J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-21 Walter V. Maresch, James Pindell, Rolf Kluge, Albrecht Baumann, Diego Villágomez Díaz, Manfred R. Brix, Stuart N. Thomson, Klaus Peter Stanek, Hans-Peter Schertl, Friedemann Grafe
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From São Francisco Craton to Jacuipe basin, passing trough the South Tucano and Recôncavo grabens: New insights from wide-angle-MCS data J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-17 Daniel Aslanian, Flora Gallais, Mikael Evain, Philippe Schnürle, Joao Pinheiro, Alexandra Afilhado, Afonso Loureiro, Nuno Dias, J.A. Cupertino, Adriano Viana, Maryline Moulin
The structure and nature of the crust underlying the Northeast Brazilian margins have been investigated based on the interpretation of 12 wide-angle seismic profiles acquired during the SALSA (Sergipe ALagoas Seismic Acquisition) experiment in 2014. In this study, we present the coincident analyses of 2 marine seismic reflection and refraction data, SL07 and SL 08, that have been acquired using 15
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The missing sedimentological section linking the Neogene and quaternary of the Tandilia system and the Salado basin, Buenos Aires province, Argentina J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-17 María Soledad Gualde, María Julia Arrouy, Marcelo Zárate, Sebastian Dietrich, Camila Ailén Gregorini
The Tandilia system and the Salado basin are two adjacent morphostructural units located within the Argentine Pampean plain, each exhibiting distinct and independent geological histories. The Tandilia system preserves outcrops of Argentina's oldest Proterozoic rocks, while the sedimentary record of the Salado basin began during the Jurassic period. However, starting in the Cenozoic era, both units
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Cenozoic morphotectonic evolution of the eastern edge of Paraná Sedimentary Basin, southern Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-16 Emerson Sanches, Eduardo Salamuni, Clauzionor Lima da Silva, Marcilene dos Santos, Jéssica Miranda dos Santos, William Rudolf Lopes Peyerl
The Paraná Sedimentary Basin (PSB) is one of the most important geotectonic structures on the South American continent and its tectono-sedimentary evolution has been widely investigated, especially during the Paleozoic and Mesozoic. However, the post-rift Cenozoic dynamics need further studies to fully understand its evolution. Hence, this research aims to add data and interpretations regarding the
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Extending the mid-18th century eruptive record of the Cordón Caulle Volcanic Complex (40,5° S) through the study of three lake sedimentary sequences J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-16 D. Soledad Sosa, Romina Daga, Alejandro Demichelis, Walter Alfonzo, Sergio Ribeiro Guevara
The research focuses on the characterization of a tephra level extracted from sedimentary sequences obtained from three lacustrine environments from the northern Patagonia Andean range to define the volcano of origin. The dating of the tephra level corresponds to the mid-18th century but there is no scientific record nor geological evidence of this event. The sediment sequences were collected from
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Impacts of anthropocene sea-level rise on people, environments, and archaeological sites in Marajó Island, Brazilian Amazonia J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-16 Renata Jordan Henriques, Fábio Soares de Oliveira, Carlos Ernesto Gonçalves Reynaud Schaefer, Paulo Roberto Canto Lopes, Eduardo Osório Senra, Valéria Ramos Lourenço, Márcio Rocha Francelino
Coastal marine systems worldwide present several risks through the global sea-level rise (SLR) trends. The Amazon Delta and Estuary (ADE) in Pará state, Brazil, is a mainland archipelago with variable landscapes and vulnerable archaeological sites in the context of global climate change. We aimed to recognize the human and environmental conditions knowledge for support directives to mitigate possible
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Geomagnetic full vector fluctuation in Mexico over the last two centuries: Anomalous record between 1840 and 1940? J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-15 Germán Guillén-Arandía, Rafael García-Ruiz, Avto Goguitchaichvili, Vadim Kravchinsky, Juan Morales
Study of the paleosecular variation of the Earth's Magnetic Field is an almost unique way to estimate the critical conditions at the core-mantle boundary. The continuous and quasi-periodic changes in the magnitude and directions (declination and inclination) could be detected from direct instrumental measurements or through the remanent magnetization of volcanic and sedimentary rocks. Burned archaeological
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Longshore sediment transport rate in Formosa Bay, Rio de Janeiro State - Southeast Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-15 Daniel Fernandes, João Wagner Alencar Castro
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Conglomerate geomorphology in the Precambrian Camaquã basin of southernmost Brazil: Contribution to a global panorama J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-14 André Weissheimer de Borba, Anderson Augusto Volpato Sccoti, Felipe Guadagnin
This paper presents the geomorphological features of four areas of subtropical, southernmost Brazil displaying striking landforms developed upon Precambrian Camaquã Basin conglomerates in the southern Brazilian shield areas. The distinctive and unique features of the cuesta, the canyon, the inselberg, and the cap-shaped hills are important examples of such conglomerate geomorphology in South America
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From 3.4 Ga TTG generation to 2.9 Ga crustal anatexis: The Archean crustal evolution of Porteirinha Complex (SE, Brazil) J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-14 Diogo Gabriel Sperandio, Matheus Kuchenbecker, Danilo Barbuena, Amós Martini
The Porteirinha Block (PB) provides an important record of the origin and evolution of South American crust. The PB records the generation of Paleoarchean TTG, Mesoarchean anatexis, and Paleoproterozoic crustal reworking. It is exposed as a basement inlier in the Araçuaí Orogen as a result of a tectonic involvement of the continental margins of São Francisco Congo Paleocontinent (PSFC) during the collisional
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Analysis of the relationship between land use change and piezometric levels in the basin of Mexico J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-14 Gachuz Serrano Nohemi, Olea-Olea Selene, Escolero Oscar, Medina-Ortega Priscila
This study was based on remote sensing monitoring, particularly Landsat data, to identify land use changes (agricultural and urban) in the study area over five periods: 1973, 1986, 1994, 2001, and 2014. In addition, data on piezometric levels from the same periods were utilized to analyze and assess the relationship between these levels and land use changes. The aim was to understand the changes in
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Innovative methodology for estimating Mountain-Front Recharge in data-scarce regions: A case study in Mexico City J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-13 Juan Camilo Montaño-Caro, Oscar Escolero, Eric Morales-Casique, Raúl Silva-Aguilera, Sandra Blanco-Gaona, Jose Roberto Florez-Peñaloza
Despite the critical role mountainous regions play in the hydrological cycle, the scarcity of subsurface hydrogeological data hampers accurate estimations of mountain-front recharge (MFR) and its components. This research proposes a cost-effective and replicable methodology for the preliminary estimation of MFR components in conditions of data scarcity. The proposed methodology, encompassing three
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Contrasting short-term shoreline behaviour after the construction of sinusoidal groynes in NE Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-13 Yan Gurgel Vasconcelos, Davis Pereira de Paula, Óscar Manuel Ferreira, Melvin M. Leisner
Coastal structures, such as groynes and breakwaters, disrupt coastal processes and often promote sediment accumulation updrift and erosion downdrift. However, complex or different groyne designs, such as curved groynes can lead to different behaviours that are still poorly understood. This study investigated the short-term morphological changes caused by the construction of three sinusoidal groynes
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First fossil record of a Turkey vulture (Cathartes aura) in northeast of Brazil: Taxonomy, ichnology, and taphonomic history J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-09 Ronaldo Araujo Leoni, Laís Alves-Silva, João Paulo da Costa, André Vieira de Araújo, Hermínio Ismael de Araújo-Júnior, Mário André Trindade Dantas
Aves are relatively rare as fossils in cave environments in Brazil, particularly in the Northeast region, where, until now, only one individual has been registered in a cave in Bahia. Here we focus on the taxon identification, ichnology, and biostratinomic analysis of avian remains discovered at Toca da Boa Vista cave, Campo Formoso, Bahia, Brazil. Taxonomic and anatomical identification of the elements
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Chronological sequence of charcas igneous complex and their relationships with Zn–Pb–Ag mineralization events, San Luis Potosi state, Mexico J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-06 J.E. Garcia Dobarganes-Bueno, G. Levresse, J. Estrada-Carmona, A.F. Nieto-Samaniego, E. Deloule, T. Orozco-Esquivel
The Charcas Intrusive Complex (CIC), comprised of monzogranites and granodiorites is located at the eastern edge of the Mesa Central in México. The CIC was dated by U/Pb on zircon crystals, from Tithonian to Rupelian ages and three distinct magmatic pulses were identified: (1) Tithonian (∼150 Ma), (3) Ypresian to Lutetian (∼55–∼44 Ma), and (3) Rupelian (∼30–∼27 Ma). The Early Cretaceous to Lutetian
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Exploring a CNN model for earthquake magnitude estimation using HR-GNSS data J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-05 Claudia Quinteros-Cartaya, Jonas Köhler, Wei Li, Johannes Faber, Nishtha Srivastava
High-rate Global Navigation Satellite System (HR-GNSS) data can be highly useful for earthquake analysis as it provides continuous high-frequency measurements of ground motion. This data can be used to analyze diverse parameters related to the seismic source and to assess the potential of an earthquake to prompt strong motions at certain distances and even generate tsunamis. In this work, we present
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Depositional facies of Cambrian Series 2 – Miaolingian transition in the El Sahuaral Hill, central Sonora, Mexico: Paleoenvironments and regional stratigraphic correlation J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-04 Héctor Arturo Noriega-Ruiz, Francisco Javier Cuen-Romero, Frederick A. Sundberg, José Alfredo Ochoa-Granillo, Rogelio Monreal, Francisco Javier Grijalva-Noriega, Blanca Estela Buitrón-Sánchez, Juan José Palafox-Reyes
Studies on lower Paleozoic sedimentary facies are scarce in northwestern Mexico, and the information is mainly restricted to Ordovician sequences in central Sonora. Series 2 – Miaolingian detrital-carbonate deposits of the El Sahuaral Hill located in central Sonora, northwestern Mexico, were analyzed for siliciclastic and carbonate microfacies, and biofacies based on the presence of trilobites. This
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Paleosol distribution and morphology along a late Cretaceous distributive fluvial system in the Bauru Basin, Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-01-30 Emerson Ferreira de Oliveira, Alessandro Batezelli, Yuri Lopes Zinn
Distributive Fluvial Systems (DFS) are fan-shaped landforms constituted by a radial system of channels that diverge downstream from an active apex, where the drainage emerges from the confinement valley. In such landforms, elevation, distance from fluvial channels, sedimentation rates, surface stability, and plant cover control weathering processes and soil development, but these features are obliterated
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Changes in Lu/Lc and vegetation around the Acapulco Bay at southwest Mexico from the hurricane Otis (October 25, 2023) J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-03 Priyadarsi D. Roy, Logesh Natarajan, Lakshumanan Chokkalingam
Impact of the category 5 hurricane Otis on October 25, 2023, were revealed through changes in land use/land cover (Lu/Lc) and vegetation density (NDVI) in an area of ca.640.5 km, surrounding the Acapulco Bay at southwest Mexico. Waterlogging (ca.110 km) mostly occurred in the crop land, fallow land and forest located in the swamps as well as on coastal barrier of the Tres Palos Lagoon (SE of the Bay)
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Delineation of the boundaries of San Blas basin, Mexico, merging gravity, magnetic, and seismic data J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-03 M. Camacho-Ascanio, R. Alvarez
The San Blas Basin (SBB) is located within what is referred to as the Mazatlán Basin, in the offshore west of Mexico. The SBB is positioned in the southern part of the Mazatlán Basin, within a region that remains poorly understood. Specifically, details about its shape and size are currently unknown, and only a few studies have provided some understanding of its limits. To ascertain the extent of the
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Estimated evaporation of lakes by climate reanalysis data and artificial neural networks J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-03 Eduardo Morgan Uliana, Uilson Ricardo Venâncio Aires, Marionei Fomaca de Sousa Junior, Demetrius David da Silva, Michel Castro Moreira, Ibraim Fantin da Cruz, Handrey Borges Araujo
Evaporation, together with precipitation, is the most important component of the hydrological cycle, and knowledge of the local values of lake evaporation has applications in reservoir design and management. The objective of this study was to estimate lake evaporation at locations without meteorological monitoring using ERA5 reanalysis data and artificial neural networks (ANNs). Data from 32 automatic
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Deformational structures in the lower Barra Velha formation, Aptian, Atapu field, Santos Basin J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-02 Silvia Amorim Terra, Andre Ribeiro, Manuella Virgolino Mafia, Felipe Nepomuceno, Douglas Renato Lima da Silva, Leonardo Borghi
The Barra Velha Formation, an Aptian Pre-salt unit of the Santos Basin, southeastern Brazil, is well-known for containing an important hydrocarbon reservoir. In the Atapu field, the lower part of the formation consists of laminated lutite (carbonate, siliciclastic, and hybrid), microbialite, and tufa rocks. The succession records muddy and in situ carbonate deposition in a low energy and shallow alkaline
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3D geoelectric modeling to characterize ferruginous caves in Brazil, using numerical and physical simulation J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-01-31 Luiz Henrique Cardoso, Luis de Almeida Prado Bacellar, Nilciléia Cristina de Magalhães Oliveira, Álvaro Simões Maciel
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Mineralogical evaluation of a new global ilmenite resource from the coast of southern Brazil J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-01 Cássia Fatima Wust, Monique Aparecida Marchese Rizzi, Lucy Takehara, Glaucia Nascimento Queiroga, Tiago Jonatan Girelli, Farid Chemale Junior
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Sedimentology and stratigraphic evolution of the Early Cretaceous regressive cycle at the northern edge of the Austral-Magallanes Basin, Santa cruz, Argentina J. South Am. Earth Sci. (IF 1.8) Pub Date : 2024-02-01 Mauro Nicolás Valle, José Matildo Paredes, Nicolás Foix, Maximiliano José Pérez Frasette
The northern edge of the Austral-Magallanes Basin in southern Patagonia (Argentina) contains a 200–300 m thick regressive section of Barremian-Aptian age. The conformably stratigraphic sequence consists of outer-shelf deposits of the Río Mayer Formation, evolving to a shallowing-upward, mixed-energy deltaic sequences of the Río Belgrano Formation, covered by fluvial deposits of the Río Tarde Formation