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What drove late Mesozoic extension of the northern China-Mongolia tract?

What drove late Mesozoic extension of the northern China-Mon...

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中国科学院地质与地球物理研究所2003学术年会

作者： Qing-Ren Meng~* Institute of Geology and Geophysics,Chinese Academy of Sciences,PO Box 9825,Beijing 100029,China

The northern China-Mongolia tract exhibited a tectonic transition from contractional to extensional deformation in late Mesozoic *** Middle to early Late Jurassic crustal shortening is widely thought to have resulted from collision of an amalgamated North China-Mongolia block and the Siberian plate,but widespread late Late Jurassic-Early Cretaceous extension has not been satisfactorily explained by existing *** prominent features of the extensional tectonics of the northern China-Mongolia tract are:(1) Late Jurassic voluminous volcanism prior to Early Cretaceous large-magnitude rapid extension;(2) overlapping in time of contractional deformation in the yinshan-Yanshan belt with development of extension-related basins in the interior of the northern China-Mongolia tract;and(3) widespread occurrence of alkali granitic plutonism. extensional basins and metamorphic core complexes in the Early Cretaceous.A new explanation is advanced in this study for this sequence of *** collision of amalgamated North China-Mongolia with Siberia led to crustal overthickening of the northern China-Mongolia tract and formation of a high-standing *** breakoff at depth of the north-dipping Mongol-Okhotsk oceanic slab is suggested as the main trigger for late Mesozoic lithospheric extension of that *** breakoff resulted in mantle lithospheric stretching of the adjacent northern China-Mongolia tract with subsequent ascent of hot asthenosphere and magmatic underplating at the base of the ***,these phenomena triggered gravitational collapse of the previously thickened crust,leading to late Late Jurassic-Early Cretaceous crustal extension,and importantly, coeval contraction along the southern margin of the plateau in the yinshan-Yanshan *** proposed model provides a framework for interpreting the spatial and temporal relationships of distinct processes and reconciling some seemingly contradictory phenomena,such as the synchronous ext

关键词： Crustal extension Gravitational collapse yinshan Daqing Shan Northern China and Mongolia

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