Erosion history of the Tibetan Plateau since the last Interglacial: constraints from the first studies of cosmogenic 10Be from Tibetan bedrock
- Lal, Devendra
- Harris, Nigel B.W.
- Sharma, Kewal K.
- Gu, Zhaoyan
- Ding, L.
- Lui, Tungsheng
- Dong, Weiquan
- Caffee, Marc W.
- Jull, A.J.T.
DOIAbstract
The cosmogenic 10Be exposure histories of in situ bedrock surfaces from the Tibetan Plateau indicate low erosion rates of <30 mm/ka in southern and central Tibet during the last interglacial–glacial cycle that contrast strongly with unusually rapid erosion rates (60–2000 mm/ka) for Kunlun in northern Tibet during the Holocene, comparable with published values from the Himalaya. By comparing apatite fission-track ages with cosmogenic data, erosion rates in southern Tibet appear to be decelerating since the Miocene, whereas in the Kunlun, erosion rates have accelerated over the same timescale. Such secular changes suggest that the southern and central regions of the plateau had formed their present flat relief by the Pleistocene. Unusually hi...
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