中国大陆岩石圈与中新生代盆地构造-热体制

The tectonic-thermoregime of lithosphere and Meso-Cenozoic basin in China's Mainland.

运用横贯中国大陆主要造山带与盆地的6条区域地质-地球物理解释地学大断面,结合岩石学研究成果,在综合分析中新生代以来岩石圈壳幔结构组成、岩石圈尺度大地构造意义的基础上,探讨不同类型盆地在岩石圈尺度构造-热体制方面的差异特征,认为:塔里木、准葛尔、四川盆地成因的构造-热体制为大陆深俯冲;柴达木、酒泉盆地成因构造-热体制为:早期岩石圈减薄诱发走滑拉分和晚期构造挤压反转;临汾、银川新生代盆地对应岩石圈热胀-拉伸;松辽盆地以岩石圈压扭性热胀与地幔热收缩为特色;渤海湾盆地则以岩石圈地I幔减薄与增厚波动为特征。这样一种区域性岩石圈尺度的伸展、压缩或压缩兼剪切的构造面貌,与中生代以来新构造运动体制下的岩石圈深部物质运动有关,为当今中国大陆地区近地壳浅部不同类型盆地生成的构造-热体制差异研究,提供岩石圈尺度的深部依据。

The lithosphere-scale differences oi tectonic-thermoregime in different basins were discussed based on 6 interpreted profiles from regional geology and geophysical data across China's Mainland, with combination of petrological achievements and the study of lithos-pherical crust-mantle component and geotectonics. It is concluded that the Tarim, Junggar, and Sichuan basins are formed from continental subduction. Caidam and Jiuqan basins are resulted from shove and pull-apart in the early stage due to the thinning of litho-sphere as well as tectonic squeezing and reversal at late stage. The Cenozoic basins of Linfen and Yinchuan correspond to thermal expansion and extension of lithosphere. Songliao basin is characterized by compresso-shear thermal expansion of lithosphere and thermal contraction of the mantle. Bohaiwan basin features the alternations of thinning and thickening of lithospherical mantle. The lithosphere-scale regional extension and compression or compression plus shearing is related to the movement of materials deep in the lithosphere since the Mesozoic era which provides evidences for the study of differences in tectonic-thermoregime for shallow basins in China's Mainland.