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Transport network and flow mechanism of shallow ore-bearing magma in Tongling ore cluster area

Science china Earth sciences 2006年第4期49卷 397-407页

作者： DENG Jun1,2, WANG Qingfei1,2 , HUANG Dinghua3., WAN Li4. YANG Liqiang1,2 & GAO Bangfei1,2 1. state key Laboratory of geological {3. and mineral resources, china university of geosciences, beijing 100083. china 2. key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of geo- sciences, beijing 100083. china 3. Faculty of Earth sciences, china university of geosciences, Wuhan 4.0}074. china 4. School of Mathematics and Information Science, Guangzhou university, Guangzhou 5104.5, china state key Laboratory of geological {3. and {4. resources China University of Geosciences Beijing China key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing China Faculty of Earth sciences China University of Geosciences Wuhan China School of Mathematics and Information Science Guangzhou University Guangzhou China

Abundant studies revealed that shallow intrusions of the Yanshanian epoch resulted in the mass mineralization of the Tongling region. Various evidences showed there existed a concealed magma chamber at ?10 km depth in the middle part of this region during Yanshanian epoch, from which the ore-forming magma was generated and then transported to the superficial layer. Yet the transport network and flow mechanism of the shallow ore-bearing magma, the key problem associ- ated with ore-forming process, was relatively little focused on. Integrate analysis of structural me- chanics, statistical fractal and geological facts suggested that NE trending high-angle fold-related thrust faults and the tessellated basement ones served as the main pathways for the shallow magma’s transporting, moreover, the saddle void spaces among adjacent strata in the folds upon this fault system provided the place for magma’s emplacement. So the folds in the upper part and faults in the lower part of the upper crust constituted the fluid’s transport and emplacement network. During the deformation of geologic body with multi-layer structure, the layers in the upper part tended to fold when received the jacking stress from the lower part, while the lower one inclined to fault undergoing loads of the upper part. And the producing probability of this structure assemblage was highly in- creased in the condition, such as in the Tongling area, that the mechanic rigidity of the lower layers was stronger than that of the upper ones. For the pre-existence of fluid-conducting network, the top magma with high volatile in the magma chamber transported rapidly to the superficial layer in dyking pattern, located in the void spaces of folds, filled and reconstructed them. The sudden drop of pres- sure caused the fluid unmixing from the magma and mass ore-forming elements concentration. Pulse activity of the dyking may be the principal reason why magmatic bodies in the Tongling area were spatially-temporally con

关键词： Tongling, structural network, magma intrusion, fractal, dyke.

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SHRIMP U-Pb dating and Hf isotopic analyses of Middle Ordovician meta-cumulate gabbro in central Qiangtang, northern Tibetan Plateau

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Science china Earth sciences 2010年第5期53卷 657-664页

作者： ZHAI QingGuo1 WANG Jun1, LI Cai2 & SU Li3.1 Institute of geology, Chinese Academy of geological sciences, {3. 10003., china 2 College of Earth sciences, Jilin university, Changchun 13.061, china 3.the geological Laboratory center and {14. key Laboratory of geological processes and mineral resources, china university of geo- sciences, beijing 100083. china Institute of geology Chinese Academy of Geological Sciences Beijing China College of Earth sciences Jilin University Changchun China The geological Laboratory center and state {3. Laboratory of geological processes and mineral resources China University of Geosciences Beijing China

Metabasites consisting of metamorphic ultra-mafic rocks, cumulate gabbro, gabbro (diabase), basalt, and plagiogranite are exposed at the Taoxinghu area in central Qiangtang, northern Tibetan Plateau. Zircon SHRIMP U-Pb dating for the cumulate gabbro yields a weighted mean age of 4.7±4.Ma, which is the oldest and most reliable magmatic age in this area. Zircon 176Hf/177Hf ratios range from 0.282615 to 0.282657, with εHf(t) values of 5.02±0.28, indicating that the cumulate gabbro was mainly derived from the depleted mantle. In addition, geochemical data of metabasites suggest that they have similar characteristics to those in the mid-ocean ridge basalts (MORB). The Taoxinghu metabasites may represent the fragment of Early Paleozoic ophiolite in the "Central Uplift" of the Qiangtang, northern Tibetan Plateau.

关键词： Qiangtang cumulate gabbro SHRIMP dating Hf isotope

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Hydrocarbon Reservoir Model of Glutenite in the Fourth Member of Shahejie Formation in Northern Dongying Depression

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地学前缘 2009年第S1期16卷 136-137页

作者： Hui Liu~(1,2),Yingchang Cao~3.Yanzhong Wang~3.1.state key Laboratory of {4.logical {3. and mineral resources,china university of {4.sciences,beijing 100083. china. 2.School of Energy resources,china university of {4.sciences(beijing),beijing 100083.china 3.Faculty of {4.-resources and Information,china university of Petroleum,Dongying 257061,china

The glutenite in the fourth member of Shahejie Formation(Es^4. in northern Dongying depression straightforwardly penetrated into the muddy bathyal -abyss *** conditions of reservoir is very superior:(1) the high quality thick bedded oil source rock is developed very well in the Lijin sag and Minfeng sag of the study area,and it has the higher capability of generating hydrocarbon;(2) the

关键词： glutenite hydrocarbon reservoir formation northern Dongying depression fourth member of Shahejie Formation

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Inclination Deepening of Paleogene Red Beds in the Qiangtang Terrane,the Hinterland of the Qinghai-Tibet Plateau

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地学前缘 2009年第S1期16卷 94-95页

作者： Bo Ran,Zhifei Liu,Chengshan Wang,Xixi Zhao,Yalin Li 1.College of Earth sciences,Chengdu university of Technology,Chengdu 610059,china. 2.Laboratory of Marine {3.logy,Tongji university,Shanghai 200092,china 3.state key Laboratory of {3.logical processes and mineral resources,Research center for Tibetan Plateau {3.logy,china university of {3.sciences,beijing 100083.china 4.Institute of Tectonics and Earth sciences Department,university of California,Santa Cruz,CA 95064.USA

In this research,one hundred and ten samples（ten sampling localities）were drilled by a portable petrol-driven drill in the Tongtianhe area along the highway where developes Yaxicuo Group,Oligocene. Complete demagnetization were finished in university of California,Santa Cruz（UCSC）.These remanence data were collected:Dg=3.4.2,Ig=52.3.α95=7.1,k=7.3.before structural correction）;Ds=27.2, Is=66.6,α95=7.3.k=7.0（after structural correction）.

关键词： inclination deepening red beds Yaxicuo Group remagnetization

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Sr-Nd isotopic compositions of the Changjiang sediments: Implications for tracing sediment sources

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Science china Earth sciences 2007年第10期50卷 1556-1565页

作者： YANG ShouYe1?, JIANG ShaoYong2, LING HongFei2, XIA XiaoPing3. SUN Min3.& WANG DeJie4.1 state key Laboratory of Marine {4.logy, Tongji {3., Shanghai 200092, china 2 state key Laboratory for mineral Deposit Research, Nanjing {3., Nanjing 210093. china 3.Departmen of Earth {14., The {3. of Hong Kong, Hong Kong SAR, china 4.Development Research {13., china {4.logical Survey, beijing 100083. china state key Laboratory of Marine geology Tongji University Shanghai 200092 China state key Laboratory for mineral Deposit Research Nanjing University Nanjing 210093 China Departmen of Earth sciences The University of Hong Kong Hong Kong SAR China Development Research center China Geological Survey Beijing 100083 China

The suspended particulate and fine-grained floodplain sediments were collected from the main stream and tributaries of the Changjiang River for Sr-Nd isotopic measurements. The εNd(0) values gradually decrease downstream from -10.8 on average in the upper reaches to -12.3.in the lower reaches, whereas the 87Sr/86Sr ratios increase correspondingly, averaging 0.721899 and 0.725826 respectively in the upper and middle-lower reaches. The compositional variations primarily reflect the complex con- trols of provenance rocks, chemical weathering, and sediment characters between different catchments, among which the abnormal Sr-Nd isotopic compositions of the Yalong, Fujiang, Tuojiang and Yuanjiang rivers indicate the sediment provenance contributions from the Emeishan Basalt in the upper reaches and the old metamorphic and siliceous rocks in the middle-lower reaches. The Sr-Nd isotopic ratios of the Changjiang sediments can better reflect the average composition of weathered continental crust compared to other major rivers in the world because of the unique source rock types in the Changjiang drainage basin. The recognition of the Sr-Nd isotopic systematics of the Changjiang sediments will contribute to our understanding of the Changjiang evolution history and continental weathering processes during the Cenozoic, and also to reconstructing the paleoenvironmental changes in East china and the marginal seas.

关键词： Sr-Nd isotopes, sediment, Changjiang River, source rock, provenance

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