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Upper Visean (Mississippian) coral biostromes during onset of the late Palaeozoic Ice Age: A record from the equatorial eastern Palaeotethys
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2024-03-12 , DOI: 10.1016/j.palaeo.2024.112148 Le Yao , Hui Wang , Markus Aretz , Wei Lin , Xiangdong Wang
Palaeogeography, Palaeoclimatology, Palaeoecology ( IF 3 ) Pub Date : 2024-03-12 , DOI: 10.1016/j.palaeo.2024.112148 Le Yao , Hui Wang , Markus Aretz , Wei Lin , Xiangdong Wang
The late Visean-Serpukhovian is a critical time in reef evolution and climate history, characterized by the gradual collapse of coral reef systems during the onset of the main glaciation phase of the late Palaeozoic Ice Age (LPIA). However, detailed palaeoecological variations of coral reefs during the collapse phase are not well understood. In this study, about one-meter thick coral biostromes are reported from the upper Visean Shangsi Formation in the Yashui section, central Guizhou Province, South China. Coral colonies are primarily in growth position resulting in the classification of autobiostrome and autoparabiostrome. Dominant colonial rugose coral species are and , respectively. The biostromal framework is simple and primarily constructed by bafflestones with slightly positive relief. Diversified dwellers are found between coral skeletons, including abundant foraminifers, crinoids, calcareous algae and brachiopods with less bryozoans, tabulate and solitary rugose corals, gastropods and ostracods. Relative sea-level fluctuations control the growth and demise of the Yashui biostromes, evidenced from changes in both microfacies and biotic assemblages from their underlying to overlying strata. The biostrome developed in relative deeper water depth than that of the biostrome, between storm wave-base and fair-weather wave-base on a shallow photic open-marine shelf. The biostrome in South China (eastern Palaeotethys) has similar biotic composition, colony preservation and depositional environments to coeval coral biostromes in Ireland (western Palaeotethys). The Yashui coral biostromes formed shortly after the LPIA onset, evidenced in small-scaled eustatic fluctuations and a positive shift in brachiopod oxygen isotopic signatures.
更新日期：2024-03-12
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