The Late Neogene 87Sr/86Sr Record of Lowland Himalayan Rivers
The Late Neogene 87Sr/86Sr Record of Lowland Himalayan Rivers
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DOI：
10.1126/science.276.5320.1828
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发表时间：
1997-06
期刊：
影响因子：
56.9
通讯作者：
J. Quade;L. Roe;P. DeCelles;T. Ojha
中科院分区：
文献类型：
--
作者：
J. Quade;L. Roe;P. DeCelles;T. Ojha
来自祖先喜马拉雅河沉积物的化石贝壳和古土壤碳酸盐提供了新近纪晚期低地喜马拉雅河水的 87 Sr/ 86 Sr 记录。重建后的 87 Sr/ 86 Sr 河流价值在中新世晚期急剧增加，可能标志着高 87 Sr/ 86 Sr 金属灰岩的开始剥露，更多地发生在喜马拉雅山中部，而不是喜马拉雅山西部。这些结果意味着海洋 87 Sr/ 86 Sr 记录可能不能代表硅酸盐风化或风化导致的大气 CO 2 消耗。
Fossil shells and paleosol carbonate from ancestral Himalayan river deposits provide a 87 Sr/ 86 Sr record of lowland Himalayan river water during the late Neogene. Reconstructed 87 Sr/ 86 Sr river values increased sharply in the late Miocene, probably marking the beginning of exhumation of high- 87 Sr/ 86 Sr metalimestones, more in the central than in the western Himalayas. These results imply that the marine 87 Sr/ 86 Sr record may not be a proxy for silicate weathering or consumption of atmospheric CO 2 resulting from that weathering.