Submerged imprint of glacier dynamics in the NW sector of Lago Viedma (southern Patagonia, Argentina)

IF 1.9 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Journal of Quaternary Science Pub Date : 2024-06-12 DOI:10.1002/jqs.3625

F. B. Restelli, J. G. Lozano, D. M. Bran, S. Bunicontro, E. Lodolo, A. A. Tassone, J. F. Vilas

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Abstract

Lago Viedma is a proglacial lake into which the Viedma Glacier flows from the Southern Patagonian Ice Field. This glacier has rapidly lost mass in recent times, and its deglacial history is reflected in the lake's subsurface. New high-resolution multi-channel seismic profiles acquired in the northwestern sector of the lake have allowed us to reconstruct the bathymetry of the area and identify several small sub-basins, which have a maximum depth of 240 m in this sector. Four seismic facies have been recognized, separated by erosional unconformities, reflecting the depositional conditions in this sector of the basin during different Quaternary sedimentation phases. There is a transitional phase from ice-contacted deposits to subglacial deposits, probably associated with a subglacial fan, and finally a phase of lacustrine sedimentation. In addition, three depositional stages were identified within the lacustrine deposits, indicating a different sedimentary input, and the morphologies observed at the lake bottom suggest the existence of at least ten stagnations of the glacial margin. This study helps to improve the history of the retreat of the Viedma Glacier in this area during the Pleistocene/Holocene and provides a basis for further geophysical measurements aimed at mapping this remote lacustrine environment.

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维德玛湖（阿根廷巴塔哥尼亚南部）西北部冰川动力学的沉没印记

维德玛湖（Lago Viedma）是一个冰川湖，维德玛冰川从南巴塔哥尼亚冰原流入该湖。该冰川在近代迅速消融，其冰川消融史反映在湖泊的地表下。在湖泊西北部获得的新的高分辨率多道地震剖面使我们得以重建该地区的水深，并确定了该地区最大深度为 240 米的几个小亚盆地。我们确认了四个地震面，它们被侵蚀不整合所分隔，反映了该流域在不同第四纪沉积阶段的沉积条件。有一个从冰雪接触沉积到亚冰川沉积的过渡阶段，可能与亚冰川扇有关，最后是湖泊沉积阶段。此外，在湖沼沉积物中还发现了三个沉积阶段，表明有不同的沉积输入，而在湖底观察到的形态则表明冰川边缘存在至少十次停滞。这项研究有助于完善更新世/全新世期间维德玛冰川在这一地区的消退史，并为旨在绘制这一偏远湖泊环境地图的进一步地球物理测量提供依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Quaternary Science 地学-地球科学综合

CiteScore

4.70

自引率

8.70%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.