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Lithosphere types in North China:Evidence from geology and geophysics

Science China Earth Sciences 2005年第11期48卷 1809-1827页

作者： QIU Ruizhao1,2, DENG Jinfu3, ZHOU Su3, LI Jinfa4, XIAO Qinghui1,5, WU Zongxu6 & LIU Cui3 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2. Development and Research Center, China Geological Survey, Beijing 100037, China 3. China University of Geosciences, Beijing 100083, China 4. China University of Geosciences, Wuhan 430074, China 5. Information Center of Ministry of Land and Resources, Beijing 100812, China 6. Institute of Geology, State Seismological Bureau, Beijing 100029, China Institute of Geology Chinese Academy of Geological Sciences Beijing China Development and Research Center China Geological Survey Beijing China China University of Geosciences Beijing China China University of Geosciences Wuhan China Information Center of Ministry of Land and Resources Beijing China Institute of Geology State Seismological Bureau Beijing China

On the basis of the characteristics of geology and geophysics in North China, three types of lithosphere, namely, the cratonic, the orogenic and the rift lithospheres can be classified. In terms of petrological method (based on the information from Precambrian rock assemblages, igneous activities, deep-seated enclaves, etc.) and the relationship between seismic velocity and rock compositions, the crust-mantle petrological and chemical structure models can be set up. Researching results indicate that the geology and geophysics of North China platform bears the similar characteristics in comparison with those of the global typical cratons. The Eerduosi(Ordos) block located in the west of the North China Platform is a remnant of cratonic lithosphere after the North China platform had undergone “activation” in Mesozoic and “reconstruction” in Cenozoic times. The continental crust consists mainly of TTG rock assemblage while the subcontinental lithosphere mantle mainly consists of strongly depleted harzburgite. The craton was finally formed in late Archaean and early Proterozoic, and has been kept in stability up to present; its crustal-mantle petrological structures of lithosphere can be set up as a reference for the study of North China craton and even Sino-Korean craton. In the Mesozoic period, the middle and east areas of North China platform were activated in the Yanshanian orogenic process, the continental crust was reformed by material and heat-transfer of convective mantle and the original crustal TTG component was reconstructed to be granitic crust, and the subcontinental lithosphere man- tle was replaced by the Yanshanian harzburgite-lherzolite. The Yanshan-Taihang Mountains were the remnants of orogenic lithosphere after the rifting in eastern North China in Cenozoic. The present thickness of continental crust and lithosphere in the Yanshan-Taihang Mountains is not equal to their thickness during the Yanshanian orogenic movement because they had undergone the

关键词： lithospheric types,evidence of geology and geophysics,crust-mantle petrological structure,deep process

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Petrotectonic Evolution of Paleo-Tethys in Western Yunnan,China

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Science China Chemistry 1994年第8期37卷 1016-1024页

作者：从柏林吴根耀张旗张儒媛翟明国赵大升张雯华 Laboratory of Lithosphere Tectonic Evolution Institute of GeologyAcademia SinicaBeijing 100029PRC

The Western Yunnan is just situated in juncture area of the Yangtze,Indosinia and Shan-Thai Microcontinents,with the geosuture zones among them marked by ophiolite suites and blue *** number of petrological data support systematic evidences for Paleo-Tethys occurring in the area,andaccording to them,the tectonic evolution is ***-Tethys might be a poly-island ocean duringthe Late Paleozoic,and relic oceanic basins developed in Triassic1 Neo-Tethys immigrated westwards *** area is an orogenic belt experiencing complicated subduction and violent continent-continent col-lision,and reformed by the younger structures,specially the Himalayan movement.

关键词： Paleo-Tethys tectonic evolution petrological contributions Western Yunnan

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Volcanic Event Layers——A Marker Bed of Correlation of Coal Measures

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Acta Geologica Sinica(English Edition) 2001年第2期75卷 184-195页

作者： JIA Bingwen, ZHOU Anchao, MA Mailing and JIA Xiaoyun Department of Earth Sciences, Taiyuan University of Technology, Taiyuan 030024, Shanxi Taiyuan Univ Technol Dept Earth Sci Taiyuan 030024 Shanxi Peoples R China

Upper Carboniferous-Lower Permian volcanic event deposits from two cross sections in Nanpiao, Liaoning Province, and the Daqing Mountains, Inner Mongolia, were examined by systematic rock and mineral identification, differential thermal analysis, X-ray diffraction, scanning electron microscopy and trace element and rare earth element quantitative analysis. According to the results, twelve sequences of volcanic event deposits have been distinguished from bottom to top, including 34–39 volcanic event layers. As these layers each have their own distinctive petrological, mineralogical and geochemical characteristics and were derived from the same source, they provide new evidence for further ascertaining the distribution characteristics of volcanic event deposits on the northern margin of the North China plate and carrying out the stratigraphic correlation using volcanic event layers as marker beds.

关键词： Late Palaeozoic volcanic event deposits petrological mineralogical and geochemical characteristics stratigraphic correlation marker bed

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A PERTOLOGICAL STUDY ON THE GABBRO XENOLITHS IN MESOZOIC BASALTS IN NINGYUAN-DAOXIAN REGION, HUNAN PROVINCE, CHINA

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Geotectonica et Metallogenia 1995年第4期19卷 78-85页

作者： Guo Feng Wu Youlin Fan Weiming and Lin Ge(Changsha Institue of Geotectonics, Academia, Sinica, 410013)

petrological and mineralogical characteristics of gabbro xenoliths in Mesozoic basalts in Ningyuan-Daoxian region, Huan province show that they belong to different rock series. The basalt is similar to alkline basalt of an intracontinental rift ; while the gabbro xenolith shows that it is the differentiated outcrop of tholeiitic lava, similar to that of layer-shaped basic pluton. The gabbro xenolith represents an early intrusion of basic melt and the melting event is probably the earlier menifestation of lithosphere mibilization in Mesozoic in the South China.

关键词： Mesozoic basalts gabbro xenoliths petrological characteristics Ningyuan-Daoxian

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