| 华南东南沿海地区岩石圈电性结构 |
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| 引用本文： | 刘国兴,韩凯,韩江涛.华南东南沿海地区岩石圈电性结构[J].吉林大学学报(地球科学版),2012,42(2):536-544. |
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| 作者姓名： | 刘国兴 韩凯 韩江涛 |
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| 作者单位： | 吉林大学地球探测科学与技术学院,长春,130026;吉林大学地球探测科学与技术学院,长春,130026;吉林大学地球探测科学与技术学院,长春,130026 |
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| 基金项目： | 国土资源部专项(Sinoprobe02-04) |
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| 摘 要： | 为了研究华南东南沿海地区的壳幔电性结构及其动力学背景,布设了4条大地电磁测深剖面,获得了相应的二维地电模型,并结合相关地质和地球化学信息对地电模型进行了研究。结果表明:研究区西部地壳由于碰撞汇聚作用变厚,东部地壳由于太平洋板块的俯冲作用剧烈减薄。华南东南沿海地区的岩石圈并不是简单的呈现"西厚东薄"的特征,研究区东西两端岩石圈厚度超过100km,推测西段岩石圈增厚主要形成于陆内挤压造山或陆内碰撞汇聚造山作用,而东端岩石圈增厚可能由于大洋板块俯冲时洋壳残留物叠置在岩石圈的下部所形成,而中部岩石圈的减薄与软流圈物质上侵有关,造成此区域大规模软流圈物质上侵的动力来自于太平洋板块俯冲产生的深部热扰动。
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| 关 键 词： | 大地电磁 东南沿海地区 电性结构 壳幔结构 动力学 岩石圈 |
Lithosphere Electrical Structure in Southeast Coastal Region ,South China |
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| Liu Guo xing
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Han Kai
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Han Jiang-tao.Lithosphere Electrical Structure in Southeast Coastal Region ,South China[J].Journal of Jilin Unviersity:Earth Science Edition,2012,42(2):536-544. |
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| Authors: | Liu Guo xing Han Kai Han Jiang-tao |
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| Institution: | College of GeoExploration of Science and Technology,Jilin University,Changchun 130026,China |
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| Abstract: | Four magnetotelluric sounding profiles were designed and relevant 2D electrical structure models were obtained in order to research the electrical structure of crust-mantle in southeast coastal region of South China.These electrical structures combined with geological background and geochemical information reveal that the west part of crust in this area became thicker because of the collision and aggregate effect,while the thickness of east section decreased rapidly due to Pacific plate subduction.The lithosphere structure in southeast coastal region of China does not simply have "west thick and east thin"feature.Lithosphere thicknesses at two ends of research area exceed 100 km.It is speculated that the thickness increeasing in western end is due to intracontinental compression orogeny or intracontinental collision and convergence orogeny,the thickness changes in east section may be the result of the oceanic crust retentions under the lithosphere when the period of oceanic plate subduction or the Pacific ancient land mass retentions under the lithosphere.The lithosphere gets thiner in central part may relates to the intrusion of asthenospheric material.The power of upper intrusion of asthenospheric material in large scale came from deep thermal disturbance formed by Pacific plate subduction. |
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| Keywords: | magnetotellurics southeast coastal region electrical structure crust-mantle structure dynamics lithosphere |
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