从斯怀兹冰川和松树岛冰川之间新发现的西弗岛花岗岩中获得的地质启示

IF 1.8 4区 地球科学 Q3 ENVIRONMENTAL SCIENCES
James W. Marschalek, Stuart N. Thomson, Claus-Dieter Hillenbrand, Pieter Vermeesch, Christine Siddoway, Andrew Carter, Keir Nichols, Dylan H. Rood, Ryan A. Venturelli, Samantha J. Hammond, Julia Wellner, Tina van de Flierdt
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引用次数: 0

摘要

大尺度地质结构控制着南极西部冰原(WAIS)冰床的长期发展,进而控制着南极西部冰原的流动。然而,完全的冰覆盖掩盖了阿蒙森海区南极洲西部冰原的两个主要出口--斯韦思冰川和松岛冰川下断层和地质边界的年龄和确切位置。在这里,我们描述了这两个冰川之间唯一的岩石露头的特征,2010 年代早期,由于缓慢流动的沿岸冰川退缩,该岩石露头形成了新的西弗岛。该岛由花岗岩组成,锆石 U-Pb 年代为约 177-174 Ma,初始ɛNd、87Sr/86Sr 和ɛHf 同位素组成分别为 -2.3、0.7061 和 -1.3。这些特征与瑟斯顿岛/南极半岛地壳块岩相似,有力地表明西弗岛花岗岩属于该区,并将该地壳块岩与玛丽-伯德陆区的边界置于瑟维斯冰川或其东部剪切缘之下。低温热年代学数据显示,花岗岩在形成后经历了快速冷却,在大约 100-90 Ma 时再次快速冷却,然后一直接近地球表面,直到现在。这些数据有助于确定松岛冰川下主要构造结构的垂直位移年代为晚白垩世。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geological insights from the newly discovered granite of Sif Island between Thwaites and Pine Island glaciers

Large-scale geological structures have controlled the long-term development of the bed and thus the flow of the West Antarctic Ice Sheet (WAIS). However, complete ice cover has obscured the age and exact positions of faults and geological boundaries beneath Thwaites Glacier and Pine Island Glacier, two major WAIS outlets in the Amundsen Sea sector. Here, we characterize the only rock outcrop between these two glaciers, which was exposed by the retreat of slow-flowing coastal ice in the early 2010s to form the new Sif Island. The island comprises granite, zircon U-Pb dated to ~177–174 Ma and characterized by initial ɛNd, 87Sr/86Sr and ɛHf isotope compositions of -2.3, 0.7061 and -1.3, respectively. These characteristics resemble Thurston Island/Antarctic Peninsula crustal block rocks, strongly suggesting that the Sif Island granite belongs to this province and placing the crustal block's boundary with the Marie Byrd Land province under Thwaites Glacier or its eastern shear margin. Low-temperature thermochronological data reveal that the granite underwent rapid cooling following emplacement, rapidly cooled again at ~100–90 Ma and then remained close to the Earth's surface until present. These data help date vertical displacement across the major tectonic structure beneath Pine Island Glacier to the Late Cretaceous.

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来源期刊
Antarctic Science
Antarctic Science 地学-地球科学综合
CiteScore
3.60
自引率
6.20%
发文量
42
审稿时长
3 months
期刊介绍: Antarctic Science provides a truly international forum for the broad spread of studies that increasingly characterise scientific research in the Antarctic. Whilst emphasising interdisciplinary work, the journal publishes papers from environmental management to biodiversity, from volcanoes to icebergs, and from oceanography to the upper atmosphere. No other journal covers such a wide range of Antarctic scientific studies. The journal attracts papers from all countries currently undertaking Antarctic research. It publishes both review and data papers with no limits on length, two-page short notes on technical developments and recent discoveries, and book reviews. These, together with an editorial discussing broader aspects of science, provide a rich and varied mixture of items to interest researchers in all areas of science. There are no page charges, or charges for colour, to authors publishing in the Journal. One issue each year is normally devoted to a specific theme or papers from a major meeting.
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