| Seismic Velocity Structure and Composition of the Continental Crust of Eastern China |
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| 作者姓名： | WANG Yang CAO Jiamin and ZHU Jieshou Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong School of Earth Sciences and Resources China University of Geosciences Beijing |
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| 作者单位： | WANG Yang，CAO Jiamin and ZHU Jieshou Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou，Guangdong 510640; School of Earth Sciences and Resources，China University of Geosciences，Beijing 100083Department of Geophysics，Chengdu University of Technology，Chengdu，Sichuan 610059 |
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| 摘 要： | On the basis of a one-by-one latitude-longitude grid three-dimensional seismic velocity model, the crustal P-wave velocity structure in eastern China (105-125°E and 18-41°N) is obtained, and a set of geotherms for each grid is established for P-T correction on P-wave velocities. The average depths of sub-crustal layers and their average P-wave velocities of 18 tectonic units in eastern China are exhibited. Our result presents a 32-34 km thick crust beneath eastern China, which is thinner than previous studies, with an average velocity of 6.54 km/s, corresponding to a 5 kg/m3 variation in crustal mean density. The thicker upper but thinner middle and lower crust results in a lower average seismic velocity of eastern China. An intermediate crustal composition with a SiO2 content of 59.7 wt% has been estimated. However, there exists a significant lateral variation in the crustal structures among the tectonic units of eastern China. The structure and composition features of some regions in eastern China in
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| 关 键 词： | 地壳成分 地震速率构造 等温线 中国东部 密度 |
Seismic Velocity Structure and Composition of the Continental Crust of Eastern China |
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| Authors: | WANG Yang CAO Jiamin and ZHU Jieshou Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong School of Earth Sciences and Resources China University of Geosciences Beijing |
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| Institution: | WANG Yang,CAO Jiamin and ZHU Jieshou Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong,School of Earth Sciences and Resources,China University of Geosciences,Beijing Department of Geophysics,Chengdu University of Technology,Chengdu,Sichuan |
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| Abstract: | Abstract On the basis of a one‐by‐one latitude‐longitude grid three‐dimensional seismic velocity model, the crustal P‐wave velocity structure in eastern China (105–125°E and 18–41°N) is obtained, and a set of geotherms for each grid is established for P‐T correction on P‐wave velocities. The average depths of sub‐crustal layers and their average P‐wave velocities of 18 tectonic units in eastern China are exhibited. Our result presents a 32–34 km thick crust beneath eastern China, which is thinner than previous studies, with an average velocity of 6.54 km/s, corresponding to a 5 kg/m3 variation in crustal mean density. The thicker upper but thinner middle and lower crust results in a lower average seismic velocity of eastern China. An intermediate crustal composition with a SiO2 content of 59.7 wt% has been estimated. However, there exists a significant lateral variation in the crustal structures among the tectonic units of eastern China. The structure and composition features of some regions in eastern China indicate that extension has played an important role in the continental crust evolution of eastern China. |
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| Keywords: | crustal composition seismic velocity structure geotherm density eastern China |
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