Transient glacial incision in the Patagonian Andes from ~6 Ma to present

Transient glacial incision in the Patagonian Andes from ~6 Ma to present
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巴塔哥尼亚安第斯山脉从约 6 Ma 到现在的短暂冰川切割

DOI:
10.1126/sciadv.aay1641
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发表时间:
2020
期刊:
影响因子:
13.6
通讯作者:
Shuster, D. L.
Shuster, D. L.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Willett, C. D.;Ma, K. F.;Brandon, M. T.;Hourigan, J. K.;Christeleit, E. C.;Shuster, D. L.

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我们报道了从1000万年前到现在巴塔哥尼亚安第斯山脉中部的山脉规模的侵蚀速度记录,其中涵盖了从河流到高山冰川景观的转变。来自高山冰川沉积物的72个花岗岩卵石的磷灰石(U-Th)/He年龄在~6 Ma前表现出缓慢的侵蚀,在高山冰川开始后,源区的空间平均侵蚀速率增加了2~3倍,分布在顶部25%的区域增加了15倍。在这一转变之后,侵蚀速率在过去约3 Ma内明显下降。我们将快速侵蚀的脉动归因于局部山谷的加深和扩大,这是高山冰川景观的特征。随后局部侵蚀速率的下降可能代表着岩石抬升和侵蚀之间恢复平衡。
We report a mountain-scale record of erosion rates in the central Patagonian Andes from >10 million years (Ma) ago to present, which covers the transition from a fluvial to alpine glaciated landscape. Apatite (U-Th)/He ages of 72 granitic cobbles from alpine glacial deposits show slow erosion before ~6 Ma ago, followed by a two- to threefold increase in the spatially averaged erosion rate of the source region after the onset of alpine glaciations and a 15-fold increase in the top 25% of the distribution. This transition is followed by a pronounced decrease in erosion rates over the past ~3 Ma. We ascribe the pulse of fast erosion to local deepening and widening of valleys, which are characteristic features of alpine glaciated landscapes. The subsequent decline in local erosion rates may represent a return toward a balance between rock uplift and erosion.
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