| 西藏南部花岗岩类中重结晶的黑云母与板块碰撞的关系 |
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| 引用本文： | 张玉泉,谢应雯,许荣华.西藏南部花岗岩类中重结晶的黑云母与板块碰撞的关系[J].地球化学,1982(1):90-95. |
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| 作者姓名： | 张玉泉 谢应雯 许荣华 |
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| 摘 要： | Recrystallized biotite occurs in granitoid rocks from some plutens in the Lhagoi Kangri and Kangdese belts in southern Xizang. These plutons are characterized by well-developed micro-fractures, orientational arrangement of dark minerals showing gneissose structures to varing extents. This is consistent with the fact that K-Ar ages of crystallized biotite (30--17 my) are much younger as compared with the host rooks. Recrystallized biotites are mostly recognized along the tectonic suture line between the Indian plate and the Eurasian continental plate, i.e., in the neighborhood of the Yarlung Zangbo River and its north bank as well as in the Lhagoi Kangri Ranges.The authors postulate that when drifting north-northeastward, the Indian sub-continental plate was conteracted by the Kangdese belt as a result of the subduction of the Indian plate underneath the Eurasian Continental plate, causing a dramatic increase instress on the southern side, i.e., near the tectanic suture line, of the rock belt followed by the rising of temperature which resulted in the recrystallization of biotite in some plutons.
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| 关 键 词： | 花岗岩 重结晶 黑云母 板块碰撞 |
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