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认知地球物质运动的大陆动力学方法
投稿时间:2019-12-08  修订日期:2019-12-29  点此下载全文
引用本文:杨文采,曾祥芝.2020.认知地球物质运动的大陆动力学方法[J].地质论评,66(1):1-12,[DOI]:.
YANG Wencai,ZENG Xiangzhi.2020.Continental dynamics with cognition of Earth matter movement[J].Geological Review,66(1):1-12.
DOI:10.16509/j.georeview.2020.01.001
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作者单位E-mail
杨文采 浙江大学地球科学学院 杭州 310027 Email:Yang007@zju.edu.cn 
曾祥芝 中国地质大学(武汉)武汉430074  
基金项目:注:本文为国家自然科学基金资助项目(编号:41574111)和中国地质调查局项目(编号:12120113093800)的成果
中文摘要:20世纪70年代板块构造学建立以后,全球地球物理调查取得了足够多的观测数据,对地壳上地幔构造进行了准确的物性成像,为克服板块构造学的存在问题的大陆动力学研究提供了可实现的基础。在地壳—上地幔物性成像的基础上,大陆动力学的研究方法首先是综合多学科数据进行全球对比。结合古地理和古地磁数据,全球对比的内容包括地幔的速度变化、电阻率扰动和位场反映的介质密度和磁性扰动异常等,它们在大陆动力学研究中,为研究地球物质运动的非板块模式提供了大量证据。多学科全球对比研究结果表明,大陆和大洋岩石圈的力学性质和物质运动形式大不相同,必须跳出板块的概念来研究大陆动力学作用过程。同时,岩石圈本身没有板块运动的动力来源,必须和软流圈物质运动一起研究,才能全面理解岩石圈的行为和物质运动的规律性。从最近几年的地幔地球物理三维成像成果看到,对于地球表面难以观察的软流圈和地下深部,对比三维的地震波速和电阻率扰动图像,可以获得关于上地幔物质运动的信息,认知已经发生在地壳—上地幔的物质运动特征。本文中介绍了几个典型例子。
中文关键词:大陆动力学  研究方法  物性成像  全球对比  物质运动
 
Continental dynamics with cognition of Earth matter movement
NameInstitution
YANG WencaiZhejiang University, School of Geosciences, Hangzhou, 310027
ZENG XiangzhiChina Geology University (Wuhan), Wuhan, 430074
Abstract:After the establishment of plate tectonics in the 1970s, the global geophysical survey of the crust and mantle obtained sufficient observation data and accurate images of physical parameters of underground structures in the earth's crust and mantle,which provided an achievable basis for the study of continental dynamics to overcome the problems exist in plate tectonics. Based on the geophysical imaging of the mantle and crust, the researches of continental dynamics aims mainly to combination with multidisciplinary data for global comparison. Combined with paleogeography and geomagnetic data, the global comparison includes the seismic velocity disturbances, resistivity disturbance and the medium density and magnetization anomalies, which provide a great deal of evidences for the study of the non plate pattern of the earth's material motion in the study of continental dynamics. The multidisciplinary results of global comparative studies show that the mechanical properties of continental and oceanic lithospheres are very different from the physical properties, and it is necessary to study the matter motion in the shallow mantle by jumping out of the concept of plates. At the same time, the lithosphere itself has no power source of plate motion, and must be studied together with the movement of asthenosphere materials in order to fully understand the behavior of the lithospheric movement. From the results of the geophysical 3D imaging in recent years, we can obtain information about the movement of matter and the characteristics of the material movement that has occurred in the deep crust and mantle by comparing the three dimensional seismic wave velocity and resistivity disturbance images that are difficult to observe on the earth's surface. Several typical examples are presented in the paper.
keywords:continental dynamics  research methods  physical attribute imaging  global comparison  matter motion
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