Pilar Jeanneret, Stella Maris Moreiras, Silke Merchel, Frank Preusser, Jan-Hendrik May, Andreas Gärtner, María Julia Orgeira
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A comprehensive geomorphological map of glacial landforms was created, along with sedimentological studies of outwash terraces. Additionally, numerical ages were obtained for both landforms using terrestrial cosmogenic nuclides for moraine boulders and luminescence dating for sandy layers in the outwash terraces. Our findings reveal at least two glacial advances since the Last Glacial Maximum (LGM), each associated with distinct outwash levels. The Río Blanco Advance occurred during the LGM, and the Laguna Advance is assigned to the late stages of the LGM, both with their corresponding outwash terraces. Additionally, the Amarillo Advance is believed to have occurred during the Holocene period and an older Marine Istope Stage 5 d named Guanaquito Advance. 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引用次数: 0
摘要
冰川波动在山区环境的地貌上留下了明显的印记,如冰碛物和冲积阶地,可以重建过去的环境变化。阿根廷亚热带安第斯山脉的山谷环境历史复杂多变,受气候和构造作用的影响,各种地表过程相互作用,影响了冰川沉积物的保存,这给揭示这些山谷的环境历史带来了挑战。因此,与安第斯山脉的其他地区相比,对该地区过去冰川的研究很少。这项研究的重点是阿根廷圣胡安省南部的布兰科河流域下段和额尔科迪勒拉山脉的山麓地带。绘制了冰川地貌综合地貌图,并对冲积阶地进行了沉积学研究。此外,还利用陆地宇宙成因核素对冰碛巨石和冲积阶地沙层进行了荧光测年,从而获得了这两种地貌的数值年龄。我们的研究结果表明,自末次冰川极盛时期(LGM)以来,至少有两次冰川运动,每次都与不同的冲积层有关。里奥布兰科冰川大进发生在末次冰川大期,拉古纳冰川大进发生在末次冰川大期晚期,两者都有相应的冲积阶地。此外,阿马里洛推进期被认为发生在全新世时期,而更早的海洋岩层第 5 阶段 d 则被命名为瓜纳基托推进期。所提供的数据为我们提供了有关全新世以来冰川波动的宝贵数字信息,同时也揭示了冰川下沉对山麓地貌的影响。
Chronology of Late Pleistocene glacial advances in a Mount Mercedario catchment, Subtropical Andes of Argentina (32° S)
Glacial fluctuations leave distinct imprints on the landscapes of mountain environments, such as moraines and outwash terraces, that allow the reconstruction of past environmental changes. Unraveling the environmental history of the valleys of the Subtropical Andes of Argentina poses challenges due to the complex interplay of various surficial processes driven by both climatic and tectonic forces, which affects the preservation of glacial deposits. Consequently, there are few studies on past glaciations in this region compared to the rest of the Andes. This study focused on the lower section of the Blanco River Basin and the piedmont of the Frontal Cordillera in the south of San Juan Province, Argentina. A comprehensive geomorphological map of glacial landforms was created, along with sedimentological studies of outwash terraces. Additionally, numerical ages were obtained for both landforms using terrestrial cosmogenic nuclides for moraine boulders and luminescence dating for sandy layers in the outwash terraces. Our findings reveal at least two glacial advances since the Last Glacial Maximum (LGM), each associated with distinct outwash levels. The Río Blanco Advance occurred during the LGM, and the Laguna Advance is assigned to the late stages of the LGM, both with their corresponding outwash terraces. Additionally, the Amarillo Advance is believed to have occurred during the Holocene period and an older Marine Istope Stage 5 d named Guanaquito Advance. The provided data add valuable numerical information about glacial fluctuations since the LGM and also reveal the impact of glacial downwasting on piedmont landforms.
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.