北喜马拉雅淡色花岗岩地球化学: 区域对比、岩石成因及其构造意义

张宏飞; NigelHarris; RandallParrish; 张利; 赵志丹; 李德威

Volume 30 Issue 3

May 2005

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Article Navigation > Earth Science > 2005 > 30(3): 275-288

ZHANG Hong-fei, Nigel Harris, Randall Parrish, ZHANG Li, ZHAO Zhi-dan, LI De-wei, 2005. Geochemistry of North Himalayan Leucogranites: Regional Comparison, Petrogenesis and Tectonic Implications. Earth Science, 30(3): 275-288.

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Geochemistry of North Himalayan Leucogranites: Regional Comparison, Petrogenesis and Tectonic Implications

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Department of Earth Sciences, The Open University, Milton Kynes, MK76AA, UK
3.
NERC Isotope Geosciences Laboratory, Keyworth, Nottingham, NG125GG, UK
4.
School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2005-01-21
Publish Date: 2005-05-25

Abstract

Abstract

The North Himalayan antiform is exposed a series of gneiss domes, intruded by the North Himalayan leucogranites(NHL)with magma emplacement ages from 27.5 to 10 Ma. The NHL are dominated by two-mica granites. They have SiO₂=70.97%-74.54%, K₂O+ Na₂O=6.27%-8.09%, K₂O/Na₂O=0.91-1.36 and A/CNK=1.10-1.33. However, they display wide variations of trace element composition with Rb=(41-322)×10^-6, Sr=(26-139)×10^-6, Ba= (135-594)×10^-6, (La/Yb)_N=0.97-17.31, Eu/Eu^* =0.29-0.72. Each body reveals distinct inter-granite trace element characteristics suggesting that each body results from distinctive conditions. The granites from the NHL resemble the two-mica granites from the High Himalayan leucogranites(HHL), but are distinct from tourmaline-muscovite granites from the HHL in their Ti, Mg, Ca, Ba contents and Rb/Sr ratio. The NHL have(⁸⁷Sr/⁸⁶Sr)_t=0.734 4-0.850 3(for t=10 Ma) and ε_Nd(10 Ma)=-12.5 to-19.3, which are indistinguishable from the HHL. Both the NHL and the HHL were derived from the anatexis of the High Himalayan Crystalline Series(HHCS)under the condition of fluid-absent melting, induced by muscovite breakdown due to decompression. The magma emplacement ages and the geological setting of the NHL are quite distinct from those of the HHL. Whilst the HHL resulted from southwards extrusion of the tectonic wedge of the HHCS during the Miocene, the NHL appear to have been generated over a much longer timespan, involving early melting during crustal thickening and subsequent melting during the exhumation of the gneiss domes. Thus the NHL and the HHL have different tectonic implications.
- leucogranite,
- geochemistry,
- petrogenesis,
- tectonic implication,
- North Himalaya,
- High Himalaya

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References(53)

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