Varying Shear Wave Splitting Parameters Suggest Interaction Between Lithosphere and Asthenosphere in Arxan‐Chaihe Volcanic Field, NE China

Varying Shear Wave Splitting Parameters Suggest Interaction Between Lithosphere and Asthenosphere in Arxan‐Chaihe Volcanic Field, NE China
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不同的剪切波分裂参数表明中国东北阿尔山柴河火山田岩石圈和软流圈之间的相互作用

DOI:
10.1029/2022gl099129
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发表时间:
2022-07
影响因子:
5.2
通讯作者:
Fengxue Zhang
Fengxue Zhang
中科院分区:
地球科学1区
文献类型:
--
作者:
Zhengyang Qiang;Qingju Wu;Yonghua Li;Fengxue Zhang

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阿尔山-柴河火山区27个临时台站两年多的宽频带地震资料为研究中国东北板内地区地幔变形及相关地球动力学过程提供了宝贵的机会。我们估计了22个台站的153对高质量的剪切波分裂参数和19个台站的98个非分裂测量值。ACVF中的大多数台站的特征是NNW-SSE走向的快速方向,具有可变的分裂延迟时间,这表明岩石圈内的岩石化伸展变形被与火山活动相关的热地幔上侵局部热擦除。在46.5°N以南地区,快极化出现急剧摆动,并出现近NW-SE和W-E两个方向的快极化,这可能与岩石圈拆沉引起的局部地幔对流有关。
Over 2 years of broadband seismic data from 27 temporary stations deployed in the Arxan-Chaihe Volcanic Field (ACVF) provides us a valued opportunity to study mantle deformation and related geodynamic processes in NE China intraplate region. We estimated 153 pairs of high-quality teleseismic shear wave splitting parameters at 22 stations and 98 non-splitting measurements at 19 stations. Most of the stations in ACVF are characterized by NNW–SSE trending fast directions with variable splitting delay times, suggesting the fossilized extensional deformation within the lithosphere is locally thermal erased by the hot mantle upwellings associated with the volcanism. In the region south of the 46.5°N, a sharp swing of fast polarization occurs, and both nearly NW-SE and W-E oriented fast directions are observed, which could be explained by small local mantle convection caused by the lithospheric delamination.
蒙古中南部地区复杂的地震各向异性及其地球动力学意义
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