Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications
Xia, Shaohong1; Shen, Yusong1; Zhao, Dapeng1; Qiu, Xuelin1; shxia@scsio.ac.cn
2015
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
卷号109页码:20-28
摘要In order to clarify lateral variations in the crustal structure and composition of the Cathaysia block in South China which was affected by violent Mesozoic and Cenozoic tectono-magmatic activities, we studied the crustal thickness and the Poisson's ratio in this region using the H-kappa stacking method of teleseismic receiver functions. Our results show that the Poisson's ratio varies between 0.20 and 0.29 and the crustal thickness ranges from 26 to 34 km in the Cathaysia block. The crustal thickness and Poisson's ratio show considerable variations across the Lishui-Haifeng Fault. The Southeast Coast Magmatic Belt is characterized by Poisson's ratios >0.25 and a crustal thickness of 28-33 km, reflecting probably intermediate to mafic compositions of the crust. The southwestern part of the Cathaysia Fold Belt exhibits a crustal thickness of 27-30 km and Poisson's ratios <0.25, reflecting a more felsic crust. However, the northeastern part of the Cathaysia Fold Belt is characterized by an almost flat Moho at a depth of similar to 31 km and a strong variation of Poisson's ratio from 0.22 to 0.27. Our results revealed an ESE-WNW trending boundary between the southwestern and northeastern parts of the Cathaysia Fold Belt, which is consistent with previous results of geochemical studies. The lateral variations in the crustal thickness and composition of the Cathaysia block may reflect not only the lithological variations of the crustal rocks but also significant effects of tectonism and magmatism on the interior of the Cathaysia block during the Mesozoic and Cenozoic. (C) 2015 Elsevier Ltd. All rights reserved.
部门归属LMB
关键词Crustal Structure Cathaysia Block Poisson's Ratio The Moho Discontinuity Magmatism Mesozoic Distant Earthquakes
学科领域Geology
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/14784
专题中科院海洋生物资源可持续利用重点实验室
通讯作者shxia@scsio.ac.cn
作者单位1.[Xia, Shaohong
2.Qiu, Xuelin] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
3.[Shen, Yusong] Earthquake Adm Guangdong Prov, Guangzhou 510070, Guangdong, Peoples R China
4.[Zhao, Dapeng] Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
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Xia, Shaohong,Shen, Yusong,Zhao, Dapeng,et al. Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications[J]. JOURNAL OF ASIAN EARTH SCIENCES,2015,109:20-28.
APA Xia, Shaohong,Shen, Yusong,Zhao, Dapeng,Qiu, Xuelin,&shxia@scsio.ac.cn.(2015).Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications.JOURNAL OF ASIAN EARTH SCIENCES,109,20-28.
MLA Xia, Shaohong,et al."Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications".JOURNAL OF ASIAN EARTH SCIENCES 109(2015):20-28.
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