藏南萨迦拉轨岗日淡色花岗岩特征及与变质核杂岩的关系

张金阳; 廖群安; 李德威; 张雄华; 袁晏明

Volume 28 Issue 6

Nov. 2003

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Article Navigation > Earth Science > 2003 > 28(6): 695-701

ZHANG Jin-yang, LIAO Qun-an, LI De-wei, ZHANG Xiong-hua, YUAN Yan-ming, 2003. Laguigangri Leucogranites and Its Relation with Laguigangri Metamorphic Core Complex in Sajia, South Tibet. Earth Science, 28(6): 695-701.

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Laguigangri Leucogranites and Its Relation with Laguigangri Metamorphic Core Complex in Sajia, South Tibet

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2003-05-15
Publish Date: 2003-11-25

Abstract

Abstract

Laguigangri metamorphic core complexes (MCC) occurred in paternoster shape in south Tibet. Leucogranites, distributed in the core or detachment of the MCC, form the famous northern Himalayan leucogranites belt. They actively emplaced and occurred in two periods: early biotite leucogranites and late muscovite leucogranites. With high SiO₂ and Al₂O₃, the leucogranites have muscovite±tourmaline±garnet aluminous minerals and so do S-type granites. The crystalline of the northern Himalayan leucogranites is dated 17-10 Ma, whose source is the para-metamorphical rocks in the high Himalayan crystalline basement on top of the MCT. The magma resulted from decompression during the conversion of the structural mechanism. Simultaneously, the pressure decompression caused more plastic lower crust and the liquid layer in younger orogen to rise to the upper crust and formed the MCC. It is found that the magma speeds the formation of the MCC.
- metamorphic core complex,
- leucogranites,
- Laguigangri,
- Sajia of Tibet

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References(17)

References

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