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Multi-oriented and layered structures of lithosphere in erogenic belt and their effects on Cenozoic magmatism——A case study of western Yunnan and Sichuan, China

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【作者】 钟大赉； 丁林； 刘福田； 刘建华； 张进江； 季建清； 陈辉；

【Author】 ZHONG Dalai , DING Lin , LIU Futian iLIU Jianhua , ZHANG Jinjiang , Jl Jianqing& CHEN HuiInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Correspondence should be addressed to Zhong Dalai Present address: Department of Geology, Peking University, Beijing 100871, China

【机构】 Institute of Geology and Geophysics； Chinese Academy of Sciences； Beijing 100029； China Correspondence should be addressed to Zhong Dalai； China Correspondence should be addressed to Zhong Dalai Present； China Correspondence should be addressed to Zhong Dalai Present Department of Geology； Peking University； Beijing 100871； China； China Correspondence should be addressed to Zhong Dalai Present；

【摘要】 <正> Integrating the surface structures with the reinterpretations of 3-D velocity images, this paper puts forward a kind of multi-oriented and layered structure for those of the upper and mid-lower crust, lithospheric and asthenospheric mantle in Tethyan erogenic belt of western Yunnan and Sichuan, China (Sanjiang belt). There exists a detachment between upper and mid-lower crust. The lithospheric mantle is a rigid and competent body unable to be deformed which preserved the older tectonic framework. The asthenosphere is an imcompetent layer that is easy to be deformed, and behaves as an initiation region of deformation, and its structural patterns reflect younger tectonics. The Cenozoic intracontinental magmatism of this region is controlled by: (i) sub-meridional and NNE trending asthenospheric upwelling around the western margin of Yangtze block; (ii) crust-mantle transitional layer formed by underplating of ascending melts; and (iii) intersection or transformation of regional structures such as major fa

【Abstract】 Integrating the surface structures with the reinterpretations of 3-D velocity images, this paper puts forward a kind of multi-oriented and layered structure for those of the upper and mid-lower crust, lithospheric and asthenospheric mantle in Tethyan erogenic belt of western Yunnan and Sichuan, China (Sanjiang belt). There exists a detachment between upper and mid-lower crust. The lithospheric mantle is a rigid and competent body unable to be deformed which preserved the older tectonic framework. The asthenosphere is an imcompetent layer that is easy to be deformed, and behaves as an initiation region of deformation, and its structural patterns reflect younger tectonics. The Cenozoic intracontinental magmatism of this region is controlled by: (i) sub-meridional and NNE trending asthenospheric upwelling around the western margin of Yangtze block; (ii) crust-mantle transitional layer formed by underplating of ascending melts; and (iii) intersection or transformation of regional structures such as major faults.

【关键词】 lithospheric structure； multi-oriented and layered structures； Cenozoic magmatism； erogenic belt； western Yunnan and Sichuan； China.；
【Key words】 lithospheric structure； multi-oriented and layered structures； Cenozoic magmatism； erogenic belt； western Yunnan and Sichuan； China.；
  • 【文献出处】 Science in China(Series D:Earth Sciences) ,中国科学(D辑:地球科学)(英文版) , 编辑部邮箱 ,2000年S1期
  • 【分类号】P542
  • 【被引频次】26
  • 【下载频次】168
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