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BASIN-RANGE SYSTEM EVOLUTION OF qinling-dabie OROGENIC BELT AND ITS IMPACT ON REGIONAL ENVIRONMENT

Geotectonica et Metallogenia 2004年第1期28卷 66-78页

作者： HU Baoqing ZENG Qiaosong LIU Shunsheng WANG Shijie National Laboratory of Environmental Geochemistry Geochemistry Institute the Chinese Academy of Sciences Guiyang GZ 550002 China Department of Geography Guangxi Teachers Education University Nanning GX 530001 China Guangzhou Institute of Geochemistry the Chinese Academy of Sciences Guangzhou GD 510640 China Guangzhou Institute of Geochemistry the Chinese Academy of Sciences Guangzhou GD 510640 China National Laboratory of Environmental Geochemistry Geochemistry Institute the Chinese Academy of Sciences Guiyang GZ 550002 China

As the structural body related to temporal-spatial evolution and tectonic dynamic system, the orogenic belt and basin are not only dependent on each other in space but also closely related with each other in terms of infrastructure, matter transference and dynamic mechanisms. By using apatite fission-track method, the authors firstly analyze the uplift and denudation ratios of the qinling-dabie orogenic belt, and by using tectonically deformed combination analysis and tectonic-thermal simulation the main geological occurrences are also illustrated. It is found that there must have had multi-phase differential uplift and denudation phenomena in the qinling-dabie orogenic belt during the Mesozoic-Cenozoic. Then, the regional evolution pattern of qualitative and quantitative denudation process is obtained during the post-orogenic period. On the basis of summarizing evolution process of the basin-range system in the qinling-dabie orogenic belt during the Mesozoic-Cenozoic and its effects on regional environment, the influence of evolution process on geomorphologic landscapes change, water system vicissitude, eco-environment succession and drainage basin system evolution is discussed.

关键词： environmental effect basin-range system evolution tectonothermal evolution qinling-dabie orogenic belt

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Lower crustal delamination in the qinling-dabie orogenic belt

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Science China Earth Sciences 1999年第4期42卷 423-433页

作者：高山张本仁金振民

Geological, geophysical and geochemical evidence for lower crustal delamination in the qinling-dabie oro-genic belt is presented and a chemical geodynamic model for lower crustal delamination is developed. The synthetic results suggest that eclogite from the dabie-Sulu ultrahigh pressure metamorphic belt is the most likely candidate as the de-laminated material, and that a cumulative 37-82 km thick eclogitic lower crust is required to have been delaminated in order to explain the relative deficits in Eu, Sr, Cr, Ni, Co, V and Ti in the present total crust composition of the Qin-ling-dabie orogenic belt. Delamination of the lower crust can well interpret many geological, geophysical and geochemical characteristics of the belt.

关键词： delamination of lower continental crust evolution of continental crust crust-mantle interaction qinling-dabie orogenic belt.

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