| ABNORMAL GEOMAGNETIC FIELD RESPONSE AT INTRAPLATE TECTONIC BOUNDARY IN CONTINENT AND CONTINENTAL MARGIN IN SOUTHEASTERN CHINA |
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| 作者姓名： | TENG Jiwen* and YAN Yafen |
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| 作者单位： | Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China |
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| 基金项目： | 国家自然科学基金，a special fund |
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| 摘 要： | South China landmass is located at the southeastern end of Eurasia, adjoining Qinghai-TibetPlateau in the west, bordering Qinling-Dabie orogen in the north and the West Pacific in the east, andbeing connected to South China Sea in the south, hence the topography landscape shows transition froman inland type to a continental marginal type. Ever since Late Achaeozoic to Early Proterozoic,Cathaysia and Yangtze blocks has undergone multiple stages of splitting and amalgamation, and did notfi…
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ABNORMAL GEOMAGNETIC FIELD RESPONSE AT INTRAPLATE TECTONIC BOUNDARY IN CONTINENT AND CONTINENTAL MARGIN IN SOUTHEASTERN CHINA |
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| TENG Jiwen* and YAN Yafen.ABNORMAL GEOMAGNETIC FIELD RESPONSE AT INTRAPLATE TECTONIC BOUNDARY IN CONTINENT AND CONTINENTAL MARGIN IN SOUTHEASTERN CHINA[J].Geotectonicaet Metallogenia,2004,28(2):93-117. |
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| Authors: | TENG Jiwen YAN Yafen |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029,China |
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| Abstract: | We used matched filter, spectrum analysis, and continuation methods of potential field for data processing and obtained the geomagnetic field distribution about the continent and continental margin in southeast China. On the basis of grid data, inversion was conducted and magnetic field distribution and magnetic structure on bedding of different depths were obtained. The new results show that: 1. The magnetic field characteristics are largely different in horizontal and vertical directions and they can be divided into zones according to the continental blocks of Yangtze, Cathaysia, Kangdian (Sichuan-Yunnan)and Qinling-Dabie. 2. The Tanlu fault extends southward along the Ganjiang fault and the Wuchuan-Sihui fault after it crossed over the Yangtze River and was offset locally in the east-west direction. The Tanlu fault finally slips into the South China Sea at Hainan Island. 3. The boundary between Yangtze and Cathaysia blocks starts from Hangzhou Bay in the east, extends along Jiangshao fault and passes through Nanchang, Changsha, and Guilin, and finally enters the sea at Qinzhou, Guangxi. 4. The distribution of buried structure zone is located at 24.5°-26°N. |
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| Keywords: | geomagnetic field landmass effect of boundary field deep process intraplate tectonic zone |
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