Isotopic characteristics of river sediments on the Tibetan Plateau
Isotopic characteristics of river sediments on the Tibetan Plateau
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青藏高原河流沉积物同位素特征
DOI：
10.1016/j.chemgeo.2009.10.015
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发表时间：
2010-01
期刊：
影响因子：
3.9
通讯作者：
Lu, Huayu
中科院分区：
文献类型：
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作者：
Yin, Hongwei;Zhang, Kaijun;Yang, Jiedong;Xu, Shijin;Wu, Weihua;Lu, Huayu
系统采集了青藏高原不同构造单元河流中40个现代碎屑沉积物样品，测定了它们的Sr-Nd同位素组成。同位素特征为青藏高原碎屑岩的古构造亲缘关系和松潘-甘孜复理石杂岩的物源问题提供了新的认识。祁连地体和喜马拉雅地体的εNd（0）值较负（分别为-14.3 ~-11.8和-20.64 ~-13.26），87 Sr/86 Sr值较高（分别为0.719674 ~ 0.738818和0.721020 ~ 0.824959），反映了这两个地体的古老和成熟陆壳成因。拉萨地体南部的εNd（0）值（-8.82 ~-3.8）和87 Sr/86 Sr值（0.711504 ~ 0.719489）较低，反映了新特提斯地幔和喜马拉雅古陆壳的共同作用。祁连地体的Sr-Nd同位素组成与扬子地块相似，表明祁连地体可能与扬子地块分离。松潘-甘孜地体的Sr-Nd同位素特征与扬子变质作用相似，而与华北变质作用、东昆仑-柴达木变质作用和中羌塘变质作用的Sr-Nd同位素特征明显不同，表明松潘-甘孜地体中广泛分布的复理石杂岩的物质来源于扬子变质作用。
We systematically collected 40 modern clastic sediment samples from rivers in different tectonic units of the Tibetan Plateau and measured their Sr–Nd isotopic compositions. The isotopic characteristics provide insight into the controversial paleo-tectonic affinity of terranes of the Tibetan Plateau and the provenance of Songpan–Ganzi flysch complex. The Qilian Terrane and Himalaya Terrane have more negative εNd(0) values (from −14.3 to −11.8 and from −20.64 to −13.26, respectively) and high87Sr/86Sr values (from 0.719674 to 0.738818 and from 0.721020 to 0.824959, respectively), reflecting old and mature continental crust origin of these two terranes. The southern Lhasa Terrane is more radiogenic in εNd(0) values (from −8.82 to −3.8) and low in87Sr/86Sr values (from 0.711504 to 0.719489), implying the combined impact of the Neo-Tethys mantle and Himalaya old continental crust. Sr–Nd isotopic compositions of the Qilian Terrane are similar to those in the Yangtze Craton, indicating that the Qilian Terrane was probably separated from the Yangtze Craton. Sr–Nd isotopic characteristics of the Songpan–Ganzi Terrane are similar to the Yangtze Craton and are remarkably different to those in the North China Craton, eastern Kunlun–Qaidam and the central Qiangtang metamorphic belt, implying that the widely distributed flysch complex of the Songpan–Ganzi Terrane was sourced from the Yangtze Craton.
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DOI：
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发表时间：
2011-12
期刊：
--
影响因子：
--
作者：
X. Mo;Z. Luo;J. Deng;X. Yu;C. Liu;W. Yuan;X. Bi
通讯作者：
X. Mo;Z. Luo;J. Deng;X. Yu;C. Liu;W. Yuan;X. Bi
影响因子：
3.9
作者：
Zhenbing She;Changqian Ma;R. Mason;Jian-wei Li;Guocan Wang;Yuhong Lei
通讯作者：
Zhenbing She;Changqian Ma;R. Mason;Jian-wei Li;Guocan Wang;Yuhong Lei
DOI：
10.1098/rsta.1988.0124
发表时间：
1988-12
期刊：
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
影响因子：
--
作者：
N. Harris;Xu Ronghua;C. Lewis;Jin Chengwei
通讯作者：
N. Harris;Xu Ronghua;C. Lewis;Jin Chengwei
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
4.9
作者：
M. Searle;Jon Cox
通讯作者：
M. Searle;Jon Cox