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Triassic Collisional Structures and Post-CollisionalDeformation of Bixiling UHP Rock Stack: Insightsfor Tectonic Evolution of UHP MetamorphicBelt in Dabie Massif, Central China

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Journal of China University of Geosciences 2002年第1期13卷 1-13页

作者： SuoShutian ZhongZengqiu 等 facultyofearthsciencesandmineralresources ChinaUniversityofGeosciencesBeijing100083 FacultyofEarthSciences ChinaUniversityofGeosciencesWuhan430074

Detailed three-dimensional structural studies indicate that the Bixiling area, Dabie massif, central China shows the deepest exposed levels of the orogenic wedge formed during the Triassic Yangtze -Sino-Korean continental collision. New 1 : 10 000 scale structural mapping, combined with detailed petrological analysis in this area, has enabled us to accurately distinguish structures related to the Triassic continental collision from those related to post-collisional deformation in the ultrahigh pressure (UHP) metamorphic unit. The collisional or compressional structures include the massive eclogite with a weak foliation, foliated eclogite or UHP ductile shear zones, as well as upper amphibolite facies shear zones, whereas the post-collisional deformation is characterized by a regionally, flat-lying foliation containing stretching lineations and common reclined folds. The former is present exclusively in the eclogite lenses and their margins, representing orogenic thickening or syn-collisional events, while the latter was best occurred on variable scales under amphibolite facies conditions, showing sub-vertical, extreme shortening and ductile thinning of the metamorphic rock stack. The eclogite facies tectonites that have a marked fabric discordance to the penetrative amphibolite facies extension flow fabric are common. It is emphasized that an extensional tectonic setting following the collision-orogenic thickening stage was, at least partly, responsible for exhumation of the UHP metamorphic rocks in the Dabie massif. A new tectonic evolution model is proposed for the UHP metamorphic belt on the scale of the Dabie massif. The Bixiling area thus provides a window, from which the dynamic processes concerning the formation and exhumation of the UHP rocks can be observed. Regional studies in the Dabie Mountains have confirmed this interpretation.

关键词： Bixiling collisional structure extensional deformation eclogite exhumation tectonic evolution.

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Kanfenggou UHP Metamorphic Fragment in Eastern Qinling Orogen and Its Relationship to Dabie-Sulu UHP and HP Metamorphic Belts, Central China

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Journal of China University of Geosciences 2003年第2期14卷 95-102页

作者： SuoShutian ZhongZengqiu ZhouHanwen YouZhendong facultyofearthsciencesandmineralresources ChinaUniversityofGeosciencesBeijing100083 FacultyofEarthSciences ChinaUniversityofGeosciencesWuhan430074

In the Central Orogenic Belt, China, two UHP metamorphic belts are discriminated mainly based on a detailed structural analysis of the Kanfenggou UHP metamorphic fragment exposed in the eastern Qinling orogen, and together with previous regional structural, petrological and geochronological data at the scale of the orogenic domain. The first one corresponds to the South Altun North Qaidam North Qinling UHP metamorphic belt. The other is the Dabie Sulu UHP and HP metamorphic belts. The two UHP metamorphic belts are separated by a series of tectonic slices composed by the Qinling rock group, Danfeng rock group and Liuling or Foziling rock group etc. respectively, and are different in age of the peak UHP metamorphism and geodynamic implications for continental deep subduction and collision. Regional field and petrological relationships suggest that the Kanfenggou UHP metamorphic fragment that contains a large volume of the coesite and microdiamond bearing eclogite lenses is compatible with the structures recognized in the South Altun and North Qaidam UHP metamorphic fragments exposed in the western part of China, thereby forming a large UHP metamorphic belt up to 1 000 km long along the orogen strike. This UHP metamorphic belt represents an intercontinental deep subduction and collision belt between the Yangtze and Sino Korean cratons, occurred during the Paleozoic. On the other hand, the well constrained Dabie Sulu UHP and HP metamorphic belts occurred mainly during Triassic time (250-220 Ma), and were produced by the intracontinental deep subduction and collision within the Yangtze craton. The Kanfenggou UHP metamorphic fragment does not appear to link with the Dabie Sulu UHP and HP metamorphic belts along the orogen. There is no reason to assume the two UHP metamorphic belts as a single giant deep subduction and collision zone in the Central Orogenic Belt situated between the Yangtze and Sino Korean cratons. Therefore, any dynamic model for the orogen mus

关键词： Kanfenggou ultrahigh pressure metamorphism intracontinental collision intercontinental collision Central Orogenic Belt eclogite.

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Crust-Mantle Structure and Coupling Effects on Mineralization : An Example from Jiaodong Gold Ore Deposits Concentrating Area, China

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Journal of China University of Geosciences 2003年第1期14卷 42-51页

作者： YangLiqiang DengJun ZhangZhongjie WangGuangjie WangJianping InstituteofGeologyandGeophysics ChineseAcademyofSciencesBeijing100101 facultyofearthsciencesandmineralresources ChinaUniversityofGeosciencesBeijing100083

Based on the results of two dimension velo city structure, 1∶100 000 aeromagnetic anomaly, 1∶200 000 bouguer gravity anom aly and seismic anisotropy of Jiaodong and neighboring region in Shandong, China , the information of geophysical field was divided into two parts: deep and sh allow focus fields. And then, the information of two different fields was c ombined with that of deep seated geology and ore deposit features. The syntheti c result was adopted to analyze three dimension structure, to probe into crust mantle coupling effects of mineralization and dynamics of ore formation system .

关键词： geophysical field crust mantle structure coupling effect dynamics of mineralization Jiaodong area of China.

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Underplating of Mesozoic Mantle-derived Magmas in Tongling, Anhui Province: Evidence from Megacrysts and Xenoliths

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Acta Geologica Sinica(English Edition) 2004年第1期78卷 131-136页

作者： DUYangsong LEEHyunkoo QINXinlong KeyLaboratoryofLithosphereTectonicsandExploration MinistryofEducation29XueyuanRoadBeijing100083 DepartmentofGeology ChungnanNationalUniversity220KungdongYuseongKuTaejon305-764RepublicofKorea facultyofearthsciencesandmineralresources ChinaUniversityofGeosciences29XueyuanRoadBeijing100083

Lithological observations and mineralogical analyses on pyroxene and hornblende megacrysts and pyroxene and hornblende cumulates in xenoliths in the Mesozoic plutons of the Tongling region, Anhui Province, provide evidence for the magmatic underplating of mantle-derived alkali-olivine basalt at circa 140 Ma. The pyroxene and hornblende megacrysts and cumulates were formed through the AFC process at depths ranging from 27 to 35 km.

关键词： magma underplating megacrysts xenoliths Tongling in Anhui Province

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