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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Geodynamic significance of leucogranite intrusions in the Lohit batholith near Walong, eastern Arunachal Pradesh, India
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Geodynamic significance of leucogranite intrusions in the Lohit batholith near Walong, eastern Arunachal Pradesh, India

机译：印度阿鲁纳恰尔邦东部瓦隆附近Lohit基岩中白云石侵入的地球动力学意义

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摘要

The Trans Himalayan Lohit batholith in the eastern part of Arunachal Pradesh exhibits a zone of intense shearing at Walong area in Anzaw district. Along the zone, intrusions of leucogranites are well documented in the area between Yasong and Walong of the Lohit valley. Sillimanite and garnet-bearing gneisses of the Yasong area represent the lithology of the host Asian crust. The 5 km wide leucogranite intrusion in the shear zone indicates tight to open asymmetric shear-related folds with boudinaged limbs and veins showing extension fractures. The pre-existing folds of the deformed Lohit batholith show transposition from the wall to the interior of the subvertical high-strain shear zone with a dominant dextral sense. The two-feldspar thermometry of the leucogranites gives a temperature range of 400 +/- 50 degrees C. This temperature of inversion from K-feldspar to microcline must have prevailed at high stress conditions at the time of emplacement of leucogranites. Melting of the metapelitic crust at higher temperatures is related to shear heating towards the end phase of development of NW-SE trending dextral shear zone in the region.
机译：阿鲁纳恰尔邦东部的喜马拉雅山麓海基岩基岩在安扎地区的瓦隆地区表现出强烈的剪切带。沿该带，在Lohit谷Yasong和Walong之间的区域中，无色花岗岩的侵入已得到充分记录。 Yasong地区的硅线石和含石榴石的片麻岩代表了东亚地壳的岩性。剪切带中5 km宽的白云石侵入体表明，紧致的，不对称的，与剪切有关的褶皱与四肢弯曲的脉和四肢显示出延伸性骨折。变形的Lohit基岩的先前存在的褶皱表现出从壁向具有垂直右旋意义的亚垂直高应变剪切带内部的移位。无色花岗岩的两长石测温法测得的温度范围为400 +/- 50摄氏度。从高钾长石转变为微晶的温度一定要在高应力条件下发生。变质岩地壳在较高温度下的熔化与该区域西北向东南趋势性右旋剪切带发展结束阶段的剪切加热有关。

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