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《中国科学院地质与地球物理研究所二○○四学术论文汇编·第二卷(青藏高原·岩石圈)》2004年
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Time range of Mesozoic tectonic regime inversion in eastern North China Block

【摘要】:正An important tectonic inversion took place in eastern North China Block(NCB) during Mesozoic,which caused a great lithosphere thinning,reconstruction of basin-range series, powerful interaction between mantle and crust,a vast granitic intrusion and volcanism,and large-scale metallogenic explosion.The time range of the Mesozoic tectonic regime inversion in the eastern North China Block is one of the key issues to understand mechanism of tectonic regime inversion.Our updated results for recognizing the time range are mainly obtained from the following aspects:structural analyses along northern and southern margins of the NCB and within the NCB for revealing tectonic inversion from compression to extension and structural striking from~EW to NNE;geothermic analyses of the eastern sedimental basins for a great change of thermal history and regime;basin analysis for basin inversion from compression to extension and basin migration from~EW to NNE;petrological and geochemical studies of volcanic rocks and lowermost crust xenoliths for recognizing peak period of mantle upwelling and intense interaction between mantle and crust,and main metallogenic epoch.All the studies of the above give the same time range from~150—140 Ma to~110—100Ma,peaking at~120 Ma.

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