The Current Situation and Advance of Research on the Source Rock for the Strontium Isotope in the Himalayan Rivers
Received date: 2005-03-10
Revised date: 2005-09-29
Online published: 2006-03-15
The variation of the marine Sr isotope is largely caused with the input of the river Sr isotope. In the global rivers, the rivers draining through the Himalayan (Ganga-Brahmaputra rivers) possess the typical Sr isotope character, i.e. high 87Sr/86Sr ratio and high [Sr] concentration, which obviously differentiates from other rivers. The Ganga- Brahmaputra, the fourth largest river in the world, is important source for the marine Sr. Currently, it is still controversial for the source rock resulting in the Sr isotope anomaly in the Ganga Brahmaputra rivers. Basically, there appear three opinions for the source rock, the first opinion advocates that the source rock is the silicate rock, the second the carbonate, and the third both the silicate and carbonate. In the recent years, our research has disclosed that the Sr in the High Himalayan rivers possesses the feature of the high 87Sr/86Sr ratio and low [Sr] concentration, which is intensely affected by the specific geology in the drainage. The study on the metamorphic rocks ( schist, gneiss ) and the granites and the minerals indicates that in the biotite in the Central Crystal Series, the 87Sr/86Sr has the positive relationship with [Rb], and that the biotite also has the high 87Sr/86Sr ratio and low [Sr] concentration. The biotite is readily weathered and should be the primary source to the radioactive 87Sr of the High Himalayan rivers. The Sr anomaly (high 87Sr/86Sr ratio and high [Sr]) in the Ganga- Brahmaputra is possibly attributed to the mixing balance of the rivers draining through the whole Himalayan.
Key words： Marine Sr isotope; Himalayan; River Sr abnormally; Source rock tracing.
Qin Jianhua,Ran Jing,Shen Ganfu,Du Gu . The Current Situation and Advance of Research on the Source Rock for the Strontium Isotope in the Himalayan Rivers[J]. Advances in Earth Science, 2006 , 21(03) : 262 -268 . DOI: 10.11867/j.issn.1001-8166.2006.03.0262
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