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Destruction geodynamics of the North China Craton and its Paleoproterozoic plate tectonics

Chinese Science Bulletin 2009年第19期54卷 3354-3366页

作者： ZHU RiXiang ZHENG TianYu Paleomagnetism and Geochronology Laboratory (SKL-LE) Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Much attention has been paid in the last two decades to the physical and chemical processes as well as temporal-spatial variations of the lithospheric mantle beneath the North China Craton. In order to provide insights into the geodynamics of this variation, it is necessary to thoroughly study the state and structure of the lithospheric crust and mantle of the North China Craton and its adjacent regions as an integrated unit. Based on the velocity structure of the crust and upper mantle constrained from seismological studies, this paper presents various available geophysical results regarding the lithosphere thickness, the nature of crust-mantle boundary, the upper mantle structure and deformation characteristics as well as their tectonic features and evolution systematics. Combined with the obtained data from petrology and geochemistry, a mantle flow model is proposed for the tectonic evolution of the North China Craton during the Mesozoic-Cenozoic. We suggest that subduction of the Pacific plate made the mantle underneath the eastern Asian continent unstable and able to flow faster. Such a regional mantle flow system would cause an elevation of melt/fluid content in the upper mantle of the North China Craton and the lithospheric softening, which, subsequently resulted in destruction of the North China Craton in different ways of delamination and thermal erosion in Yanshan, Taihang Mountains and the Tan-Lu Fault zone. Multiple lines of evidence recorded in the crust of the North China Craton, such as the amalgamation of the Archean eastern and western blocks, the subduction of Paleo-oceanic crust and Paleo-continental residue, indicate that the Earth in the Paleoproterozoic had already evolved into the plate tectonic system similar to the present plate tectonics.

关键词：地球动力学筑造学研究调查

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Interim IAGOD Conference on “Metallogeny of the Pacific Northwest： Tectonics, Magmatism, and Metallogeny of Active Continental Margins”

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Episodes 2005年第3期28卷 215-217页

作者： Dr.Galina A. Gonevchuk Dr. Reimar Seltmann Secretary of Russion Far East IAGOD Group Far East Geologicla Insticute of the Far Eastern Branch of Russion Academy of Sciences 159 Prospecr 100-Ietya Vladivostok 690022 RUSSIA Leader IGCP-473 Head CERCAMS Natural History Museum Department of Mineralogy CERCAMS （Centre for Russian and Central Asian Mineral Studies） Cromwell Road London SW75BD UNITED KINGDOM

In September 2004, the Far East Geological Institute （FEGI FEB RAS） Vladivostok hosted the interim conference of the Interna- tional Association on the Genesis of Ore Deposits （IAGOD）. The conference was devoted to the topic ＂Metallogeny of the Pacific Northwest＂. The Russian National IAGOD Group and the Far Eastern Branch of the Russian Academy of Sciences （FEB RAS） took an active part in the preparation of the conference. The Far East Geological Institute which ranks among the oldest academic institutions in the Russian Far East simultaneously celebrated its 45th anniversary in September 2004. The Organizing Committee of the conference was chaired by Professor Alexander I. Khanchuk, Director of FEGI and Corresponding Member of the Russian Academy of Sciences. The IAGOD General Assembly on their meeting in Florence, August 2004, elected Prof. Khanchuk the IAGOD＇s President for the period from 2004 to 2008. The conference was sponsored by the Far Eastern Branch of Russian Academy of Sciences （FEB RAS）, the Russian Foundation for Basic Research （RFBR）, the International Association on the Genesis of Ore Deposits （IAGOD, the Society of Economic Geologists （SEG）, and the International Geoscience Programme （IGCP Projects 473 and 486）.

关键词：矿床成因筑造学国际会议学术交流行业管理

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