The Current Situation and Advance of Research on th e Source Rock for the Strontium Isotope in the Him alaya n Rivers

doi:10.11867/j.issn.1001-8166.2006.03.0262

Advances in Earth Science ›› 2006, Vol. 21 ›› Issue (3): 262-268. doi: 10.11867/j.issn.1001-8166.2006.03.0262

Special Issue: 青藏高原研究——青藏科考虚拟专刊；

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The Current Situation and Advance of Research on th e Source Rock for the Strontium Isotope in the Him alaya n Rivers

Received:2005-03-10 Revised:2005-09-29 Published:2006-03-15

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The variation ofthe m arine Srisotope is large ly caused with the inputofthe river Srisotope . In the global rivers ， the rivers draining through the Him alayan （ Ganga- Brahm aputra rivers ） possess the typical Sr isotope
character ， i. e . high 8 7 Sr / 8 6 Srratio and high ［Sr］ concentration ， which obviously differentiates from other ri vers.
The Ganga- Brahm aputra ， the fourth largest river in the world ， is im portantsource for the m arine Sr. Current ly，it is stillcontroversial for the source rock res ulting in the Srisotope anom aly in the Ganga- B rahm aputra rivers. Basi-cally ， there appearthree opinions for the source roc k， the first opinion advocates thatthe source ro ck is the silicate rock ， the second the carbonate ， and the third both the silicate and carbonate. In the recentyears ， ourresearch has disclosed thatthe Sr in the High Him alayan riv ers possesses the feature of the high 87 Sr / 86 Sr ratio and low ［Sr］
concentration ， which is intensely affected by the specific ge ology in the drainage. The study on the m etam or phic rocks （ schist ， gneiss ） and the granites and the m inerals indicates th atin the biotite in the Central Crystal Series ，the 8 7 Sr / 8 6 Sr has the positive relationship with ［Rb］， and that the biotite also has the high 8 7 Sr / 8 6 Sr ratio and low［Sr］ concentration. The biotite is readily weathe red and should be the prim ary source to the radi oactive 87 Sr oftheHigh Him alayan rivers. The Sr anom aly （ high 8 7 Sr / 86 Srratio and high ［Sr］） in the Ganga- Brahm aputra is possi-bly attributed to the m ixing balance ofthe riv ers draining through the whole Him alayan.

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