Middle to Late Pleistocene stability of the central East Antarctic Ice Sheet at the head of Law Glacier
Middle to Late Pleistocene stability of the central East Antarctic Ice Sheet at the head of Law Glacier
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劳冰川顶部南极东部中部冰盖的中晚更新世稳定性
作者：
Kaplan, M.R.;Licht, K.J.;Winckler, G.;Schaefer, J.M.;Bader, N.;Mathieson, C.;Roberts, M.;Kassab, C.M.;Schwartz, R.;Graly, J.A.
在海洋同位素第二阶段（MIS 2）之前，流出冰川排出东南极冰盖（EAIS）的过去行为仍然没有得到解决。蓝色冰碛的研究提供了一个相对未开发的方法来了解前EAIS活动。我们聚焦于南极洲中部山脉的阿切纳尔山附近的蓝色冰碛，该山脉位于极地高原的边缘。保存完好的冰碛由准连续或丘状沉积物脊，形成的顶部向上流动，升华冰沿着法冰川的边缘。10铍，26铝，和3他宇宙成因的核素年龄从脊的巨石是连贯的，一般是逐步老与距离相对干净的冰法冰川边缘。最接近劳冰川边缘的冰碛物的年代晚于MIS 2;更远的地方，它们的年代可以追溯到最后一个冰川周期，距离更远的地方，它们的年龄已经有几十万年了。我们的结论是，宇宙成因的一些蓝色冰碛的年龄可以提供年龄限制的出口冰川，排水南极洲中部东部冰盖，包括MIS 2之前的头部的变化。此外，地貌，宇宙成因核素和沉积学证据表明，东南极极地高原邻近的中部横贯南极山脉已经相对稳定至少200 k. y。
Past behavior of outlet glaciers draining the East Antarctic Ice Sheet (EAIS) remains unresolved prior to Marine Isotope Stage 2 (MIS2). Study of blue ice moraines provides a relatively untapped approach to understand former EAIS activity. We focus on a blue ice moraine near Mount Achernar in the central Transantarctic Mountains, at the edge of the polar plateau. The well-preserved moraine consists of quasi-continuous or hummocky sediment ridges that form on top of upward-flowing, sublimating ice along the margin of Law Glacier.10Be,26Al, and3He cosmogenic nuclide ages on boulders from the ridges are coherent and in general are progressively older with distance from the relatively clean ice of the Law Glacier margin. Moraines closest to the Law Glacier margin postdate MIS2; farther away, they date to the last glacial cycle, and with more distance they are hundreds of thousands of years old. We conclude that cosmogenic dating of some blue ice moraines can provide age limits for changes at the heads of outlet glaciers that drain the central East Antarctic Ice Sheet, including prior to MIS2. Furthermore, the geomorphological, cosmogenic nuclide, and sedimentological evidence imply that the East Antarctic polar plateau adjacent to the central Transantarctic Mountains has been relatively stable for at least 200 k.y.
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雷达探测到的南极洲彭萨科拉山脉冰川地层：对近期冰流和积聚变化的影响
影响因子：
2.9
作者：
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影响因子：
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作者：
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DOI：
10.1016/j.palaeo.2011.01.027
发表时间：
2012-06
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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影响因子：
16.6
作者：
Tao Sun;R. Socki;David L. Bish;Ralph P. Harvey;Huiming Bao;P. Niles;Ricardo Cavicchioli;Eric Tonui
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