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Holocene seismic stratigraphy of the southern arms of Lago Argentino
Journal of South American Earth Sciences ( IF 1.8 ) Pub Date : 2021-07-30 , DOI: 10.1016/j.jsames.2021.103495
Jorge G. Lozano 1, 2 , Donaldo M. Bran 1, 2 , Emanuele Lodolo 3 , Alejandro Tassone 1, 2 , Juan F. Vilas 1, 2
Affiliation  

Lago Argentino hosts various calving glaciers, including the famous Perito Moreno. Although the onland Holocene glacier dynamics is rather well constrained, the paleoenvironments developed in association with a retreating ice front remain largely unknown. A detailed analysis of high-resolution seismic reflection profiles acquired in the southern arms of Lago Argentino has allowed the identification of several unconformities within the lacustrine sedimentary infill. Four seismostratigraphic sequences have been identified in Brazo Rico and three in Brazo Sur. These sequences are separated by three erosive unconformities in Brazo Rico and two in Brazo Sur, and reflect the sedimentation of a pre-Holocene deep basin in a proglacial lake. The older unconformities are associated with instability events within the basin which triggered several mass movements, possibly related to enhanced seismic activity. The younger erosive unconformities were correlated with the “Pearson 1a/Frias 1 advance”, the major glacier advance in the Holocene of the Lago Argentino Basin. This research highlights the importance of studying the glaciolacustrine sediments, representing decisive records of the glacial history and palaeoclimate, which could help unveiling the factors controlling glacier dynamics in the basin and reconstructing the deglacial landscape of the area.



中文翻译:

阿根廷湖南臂全新世地震地层学

阿根廷湖拥有各种冰川,包括著名的佩里托莫雷诺。尽管陆上全新世冰川动力学受到很好的约束,但与后退冰锋相关的古环境仍然很大程度上未知。对在 Lago Argentino 南部臂部获得的高分辨率地震反射剖面进行详细分析,可以识别出湖泊沉积填充物内的几个不整合面。在 Brazo Rico 确定了四个地震地层序列,在 Brazo Sur 确定了三个。这些层序被 Brazo Rico 的三个侵蚀不整合面和 Brazo Sur 的两个侵蚀不整合面隔开,反映了一个前冰河湖中全新世前深盆地的沉积。较老的不整合面与盆地内的不稳定事件有关,该事件引发了几次质量运动,可能与地震活动增强有关。较年轻的侵蚀不整合与“Pearson 1a/Frias 1 推进”相关,这是 Lago Argentino 盆地全新世的主要冰川推进。这项研究强调了研究冰湖沉积物的重要性,它是冰川历史和古气候的决定性记录,有助于揭示控制盆地冰川动力学的因素,重建该地区的冰消期景观。

更新日期:2021-08-09
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