Transient glacial incision in the Patagonian Andes from ~6 Ma to present
Transient glacial incision in the Patagonian Andes from ~6 Ma to present
复制标题
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.
中科院分区:
文献类型:
--
作者:
Willett, C. D.;Ma, K. F.;Brandon, M. T.;Hourigan, J. K.;Christeleit, E. C.;Shuster, D. L.
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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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
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DOI:
--
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期刊:
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