Three‐Dimensional Crustal Structures of the Shanxi Rift Constructed by Rayleigh Wave Dispersion Curves and Ellipticity: Implication for Sedimentation, Intraplate Volcanism, and Seismicity
Three‐Dimensional Crustal Structures of the Shanxi Rift Constructed by Rayleigh Wave Dispersion Curves and Ellipticity: Implication for Sedimentation, Intraplate Volcanism, and Seismicity
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瑞利波色散曲线和椭圆度构建的山西裂谷三维地壳结构：对沉积、板内火山活动和地震活动的影响
DOI：
10.1029/2020jb020146
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发表时间：
2020-11
期刊：
影响因子：
--
通讯作者：
Shida Sun
中科院分区：
文献类型：
--
作者：
Hongrui Xu;Yinhe Luo;Yingjie Yang;Weisen Shen;Xiaofei Yin;Guoxiong Chen;Xiaozhou Yang;Shida Sun
山西裂谷是世界上最大的新生代大陆裂谷之一。它是中国地震最频繁的地区之一，具有以少量岩浆为特征的火山活动。为了研究山西裂谷的大陆裂谷机制、板内火山作用和地震活动，我们通过联合反演瑞利波色散曲线和椭圆度测量，构建了以地壳为焦点的高分辨率三维岩石圈剪切速度（Vs）模型。与已发表的模型相比，我们的 3D Vs 模型提高了浅层结构的分辨率。我们的模型揭示了几个重要的速度特征。 (1) 大同盆地沉积层比晋南裂谷厚得多，表明大同盆地的沉积速率较高，这可能与大同盆地地区近几Ma的软流圈上涌以及被动裂谷有关。 (2)在大同火山下方的中地壳中观察到低速体，表明中地壳存在少量的部分熔融。 （3）大同盆地中下地壳速度较低，与地壳内深部地震自山西裂谷南向北变浅相一致，表明较高的温度可能使脆性过渡带抬升，导致山西裂谷地震震源深度由南向北变浅。
The Shanxi Rift is one of the world's largest Cenozoic continental rifts. It is one of the most earthquake prone areas in China and has volcanic activities characterized by small volumes of magma. In order to study continental rifting mechanism, intraplate volcanism, and seismicity of the Shanxi Rift, we construct a high‐resolution 3‐D lithospheric shear velocity (Vs) model with a focus of the crust by jointly inverting Rayleigh wave dispersion curves and ellipticity measurements. Compared with published models, our 3‐D Vs model has improved the resolution for shallow structures. Our model reveals several significant velocity features. (1) The sedimentary layer of the Datong Basin is much thicker than those in the southern Shanxi Rift, implying that the sedimentation rate of the Datong Basin is higher, which could be attributed in part to asthenosphere upwelling beneath the Datong Basin area in the past few Ma in addition to passive rifting. (2) A low‐velocity body is observed in the middle crust beneath the Datong Volcanoes, suggesting the presence of a small amount of partial melting in the middle crust. (3) Lower velocities in the middle and lower crust beneath the Datong Basin are coincident with the shallowing of deep earthquakes from the southern to northern Shanxi Rift in the crust, suggesting that higher temperature may elevate the brittle‐to‐ductile transition zone, leading to the shallowing of focal depths of earthquakes in the Shanxi Rift from south to north.
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影响因子：
5.3
作者：
Weilai Wang;Jianping Wu;L. Fang;Guijuan Lai;Y. Cai
通讯作者：
Weilai Wang;Jianping Wu;L. Fang;Guijuan Lai;Y. Cai
DOI：
10.1002/jgrb.50191
发表时间：
2013-05
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
--
作者：
Youcai Tang;Y. Chen;Shiyong Zhou;J. Ning;Z. Ding
通讯作者：
Youcai Tang;Y. Chen;Shiyong Zhou;J. Ning;Z. Ding
影响因子：
2.9
作者：
Yaotian Yin;Sheng Jin;Wenbo Wei;G. Ye;J. Jing;Letian Zhang;Hao Dong;C. Xie;Hongda Liang
通讯作者：
Yaotian Yin;Sheng Jin;Wenbo Wei;G. Ye;J. Jing;Letian Zhang;Hao Dong;C. Xie;Hongda Liang
影响因子：
2.8
作者：
Bensen, G. D.;Ritzwoller, M. H.;Yang, Y.
通讯作者：
Yang, Y.
影响因子：
64.8
作者：
G. Peltzer;P. Tapponnier;Zhitao Zhang;Xuxian Qin
通讯作者：
G. Peltzer;P. Tapponnier;Zhitao Zhang;Xuxian Qin