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首页> 外文期刊>Geochemistry, geophysics, geosystems >Mantle Deformation in the Eastern Himalaya, Burmese Arc and Adjoining Regions
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Mantle Deformation in the Eastern Himalaya, Burmese Arc and Adjoining Regions

机译：喜马拉雅东部的地幔变形，缅甸弧和毗邻的地区

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摘要

This study presents new results of shear wave splitting at 56 broadband stations installed in the Eastern Himalaya, Burmese Arc, and adjoining regions. The fast polarization directions (FPDs) within the Himalaya, Burmese Arc and the foredeep are parallel to the strike of the orogens, suggesting a coherently deformed lithospheric mantle under compression. The FPDs follow the Main Boundary Thrust and the Main Central Thrust in the central segment of the Arunachal Himalaya. Smaller delay times (～0.7 s) can be best explained by multiple layers of anisotropy, where combined effects of the anisotropic fabric of a coherently deformed lithosphere of the Arunachal Himalaya and plate motion related strain are playing a role. Null measurements in the Siang window may be due to the Indian plate interaction with Eurasia and Burma plates, causing different layers of anisotropy. Another possibility is the coincidence of source polarization direction with the fast axis. In the Bengal Basin, the Nulls could be due to annihilation of frozen anisotropy in the downwelling Indian lithosphere and the APM-related strain, or a highly heterogeneous mantle affected by the Kereguelen plume magmatism, at ～116 Ma.
机译：本研究介绍了在东部喜马拉雅山，缅甸弧和相邻地区安装的56个宽带站的剪力波分裂的新结果。喜马拉雅，缅甸弧线和牙齿的快速偏振方向（FPDS）与OROGENS的撞击平行，暗示压缩下的相干的​​岩石罩。 FPD遵循主边界推力和阿鲁纳恰山脉中央部门的主要中心推力。较小的延迟时间（〜0.7秒）可以通过多层各向异性解释，其中ArunAnal Himalaya和板式运动相关菌株的相干变形岩石岩层的各向异性织物的组合效应正在发挥作用。杉木窗口中的空测量可能是由于印度板与欧亚和缅甸板的相互作用，导致不同层次的各向异性。另一种可能性是源极化方向与快速轴的重合。在孟加拉盆地中，缺血可能是由于沉船在贫寒印度岩石圈和APM相关的菌株中的冷冻各向异性，或受到Kereguelen羽流岩浆影响的高度异质地幔，在〜116 mA。

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