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The continental hydrothermal sedimentary origin of the Dashui superlarge gold deposit in Gansu Province, china

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chinese Science Bulletin 1999年第S2期44卷 210-212页

作者： LI Hongyang~1, YANG Zhusen~1, GAO Zhenmin~1, LUO Taiyi~1, DING Zhenju~1 and YAN Shenghao~2.1. institute of Geochemistry, chinese Academy of Sciences, Guiyang 550002.{2. 2. institute of Mineral Deposits, chinese Academy of geological Sciences, Beijing 10003.,{2. institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing 100037 China

THE Dashui gold mine, situated in Gansu Province of western china, is a superlarge gold deposit newlydiscovered in western Qinling erogenic belt, hosted within the Permian-Triassic limestones and dolomites,as well as Jurassic conglomerates. It has been termed Carlin-type and hot spring-type gold ore, yet its origin is enigmatic. It is characterized by the formation of sedimentary and replacement bodies of hematite-hydrothermalsiliceous rocks above and adjacent to orebodies. The orebodies themselves exhibit a variety of geometries,such as funnels, pipes, sack-like, tabular zones parallel to bedding. NWW-EW striking, nearly SNstriking and NEE-NE striking faults control the ore-fluid passages. The orebody sites and shapes arelargely controlled by the intersection of such different strike faults. The ore mineral assemblage is characteristically gold-hematite-chalcedony. The gold mineralizationand hematitization and silification are closely interrelated. Five basic ore types are recognized: laminated-

关键词： continental hydrothermal sedimentation superlarge gold deposit Dashui Gansu.

SHRIMP dating of the Bangong Lake SSZ-type ophiolite: Constraints on the closure time of ocean in the Bangong Lake-Nujiang River,northwestern Tibet

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chinese Science Bulletin 2007年第7期52卷 936-941页

作者： SHI RenDeng1,2.1 School of Earth and Space Sciences, University of Science and Technology of china, Hefei 2.002., china 2.{2. of geology, chinese Academy of geological Sciences, Beijing 10003., china (email: shird@***) School of Earth and Space Sciences University of Science and Technology ofChina Hefei 230026 China

The Bangong Lake ophiolite is located in the westernmost part of the Bangong Lake-Nujiang River suture zone. It is a tectonic mélange consisting of numerous individual blocks of peridotite, pillowed and massive lavas and mafic dykes with SSZ-type ophiolitic geochemical affinity formed at the end of a Wilson circle. The SHRIMP U-Pb ages of the co-magmatic zircon domains from one gabbroic dyke (Sample 01Y-155) range from 162.5±8.6 Ma to 177.1±1.4.Ma with an average of 167.0±1.4.Ma (n = 12. MSWD = 1.2., suggesting that the subduction of the Bangong Lake Neo-Tethyan Ocean started before the Middle Jurassic. It is inferred that the tectonic transform from spreading to subduction of the Neo-Tethyan Ocean began before the Middle Jurassic in the Bangong Lake area.

关键词：西藏班公湖怒江缝合带古海洋闭合时期 SSZ型蛇绿岩 SHRIMP 测年

Metamorphosed mafic rocks with N-type MORE geochemical features in Hainan Island-Remnants of the Paleo-Tethys Oceanic Crust?

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chinese Science Bulletin 2000年第10期45卷 956-961页

作者： LI Xianhua, ZHOU Hanwen, DING Shijiang, LEE Chi-yu, ZHANG Renjie, ZHANG Yeming & GE Wenchun1. Guangzhou institute of Geochemistry, chinese Academy of Sciences, Guangzhou 51064.,{{3. {3. Hainan {4. Survey, Haikou 570{3.6,{{3. 3. Department of geology, Taiwan University, Taipei 106-17,{{3. 4. Yichang institute of geology and Mineral Resources, chinese Academy of {4. Sciences, Yichang 4.3.03.{{3.

A number of metamorphosed mafic rocks occurred within the Paleozoic strata in the Chenxing and Bangxi regions at the northern side of the Changjiang-Qionghai Fault in Central Hainan Island. These metamorphosed mafic rocks are tholeiites in chemistry. They are characterized by extreme depletion of Th, Nb, Ta and LREEs, resembling the depleted N-type mid-ocean ridge basalts (MORE). Field relations suggest that the protolith of the metamorphosed mafic rocks were likely formed in Paleozoic. These metamorphosed mafic rocks with N-type MORB geochemical features were probably the remnants of the Paleo-Tethys oceanic crust.

关键词： N-type MORB metamorphosed mafic rocks element geochemistry Hainan Island.

Features of inclusions in the Funiushan gold deposits of Central china and its implications for prospecting

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chinese Science Bulletin 1999年第S2期44卷 15-16页

作者： ZHANG Zhengwei~1, ZHU Bingquan~1 and DENG Jun~2.1. Guangzhou institute of Geochemistry, chinese Academy of Sciences, Guangzhou 5106{3.,{2. 2.{2. University of Geoscience, Beijing 100083.{2. Guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China china University of Geoscience Beijing 100083 China

GOLD mineralization popularly occurs in Funiushan area. Based on the studies on more than 4. gold deposits or ore spots, it is shown that most of them are small in scale except the Pengou gold deposit, whichcan be developed into a medium one. The Pengou is a gold deposit of medium-low temperature hydrothermal type. 1 geological setting The Funiushan gold mineralization zone lying in the contiguous region of Nanzhao, Fangcheng andLushan Counties, Henan Province, is stituated on the tectonic and geochemical boundary between theNorth china block and Qinling Orogenic belt, and transverses the two first-grade tectonic units. Thehost rocks are mainly the strata of Xionger group （Pt{3./sub> ） and the Funiushan granitic batholith. The Penggougold deposit is just located on the large-scale fault of Xiatang-Guihe. A series of metamorphic rocks ofXionger Group outcroped in the north of the deposit. {3.The features of deposit The ore bodies mostly appear in thick plate with sag-and-swell variation. The gold-bearing alterationzone from upper to lower layers can be divided as granite→ pyritization and phyllic alteration→ alteredgranitic porphyry→quartz vein→pyritization and phyllic alteration→cataclastic granite with phyllic alteration, i. e. the upper and lower gold-bearing layers can be separated by the altered granite. The ore

关键词： gold deposit inclusion geochemistry Funiushan.

Molecular dynamics study of the water/n-alkane interface

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Science china Chemistry 2010年第4期53卷 945-949页

作者： XIAO HongYan1, ZHEN Zhen1, SUN HuanQuan2. CAO XuLong2. LI ZhenQuan2. SONG XinWang2. CUI XiaoHong2.& LIU XinHou1 1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical institute of Physics and Chemistry, chinese Academy of Sciences, Beijing 100190,{2. 2.0} of geological Science, Shengli Oilfield, Dongying 2.7001,{2. 1. Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China2. Institute of Geological Science Shengli Oilfield Dongying 257001 China

Molecular dynamics simulations on the interface between liquid water and liquid n-alkane (including octane, nonane, decane, undecane and dodecane) have been performed with the purpose to study the interfacial properties: (Ⅰ) density profile; (Ⅱ) molecular orientation; (Ⅲ) interfacial tension and the temperature effect on the interfacial tension. Simulation results show that at the interface the structures of both water and n-alkane are different from those in the bulk. Water has an orientational preference due to the number of hydrogen bonds per molecule maximized. N-alkane has a more lateral orientation with respect to the interface in order to be in close contact with water. The calculated individual phase bulk density and interfacial tension of water/n-alkane systems are in good agreement with the corresponding experimental ones.

关键词： molecular dynamics water/n-alkane interface interfacial tension

Lead isotopic characteristics of the Xikuangshan superlarge Sb deposit and their geological implications

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chinese Science Bulletin 1999年第S2期44卷 52-53页

作者： PENG Jiantang~1, HU Ruizhong~1 and ZOU Liqun~2.1. institute of Geochemistry, chinese Academy of Sciences, Guiyang 550002.{2. 2. Xikuangshan Mining Bureau, Lengshuijiang 4.7502.{2. institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Xikuangshan Mining Bureau Lengshuijiang 417502 China

THE Xikuangshan Sb ore deposit located in the central part of Hunan Province, china, is the only superlarge Sb deposit so far reported in the world, and is titled as the antimony capital of the world. The strataexposed in the Xikuangshan orefield are only Devonian to Permian Series. Except for a lamprophyre dykeseen in the eastern part, no igneous rocks outcrop within or around the mining district. Orebodies occurdominantly in the Devonian Shetianqiao Formation （D3./sub>s） and subordinately in the Qiziqiao Formation（D2./sub>q）. The orebodies usually appear stratiform and stratoid in shape and are rather constant in boththickness and grade. The compositions of ores are simple. The metallic mineral is stibnite and the gangueminerals include quartz and calcite, with minor amounts of fluorite, barite and secondary gypsum. Theores are dominated by the quartz-stibnite type, the quartz-calcite-stibnite type and the

关键词： lead isotope Xikuangshan superlarge Sb deposit Hunan.

Abnormal high pressure in Kuqa foreland thrust belt of Tarim basin: Origin and impacts on hydrocarbon accumulation

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Progress in Natural Science:Materials International 2006年第12期16卷 1307-1314页

作者： ZENG Lianbo~1** and LIU Benming~ 1,2.(1. Key Laboratory of Hydrocarbon Accumulation in china Petroleum University, Ministry of Education, Beijing 102.{3., china 2. The {2. of Oil and Gas Exploration and Development, Tarim Oilfield Company, Petrochina Company Limited, Korla 8{3.000, china) [a]Ministry of Education Key Laboratory of Hydrocarbon Accumulation in China Petroleum University Beijing China [b]The institute of Oil and Gas Exploration and Development Tarim Oilfield Company PetroChina Company Limited Korla China

Following analyses of the abnormal high pressure distribution characteristics, based on the geological characteristics, tectonic stress field and physical simulation, we investigated the formation mechanisms of abnormal high pressure and its impacts on hydrocarbon accumulation in the Kuqa foreland thrust belt. The abnormal high pressure appears at the bottom of the Paleogene and obviously exists in the Triassic and Jurassic. However, the pressure coefficient in the Triassic and Jurassic is lower than that in the Cretaceous and at the bottom of the Paleogene. Horizontally, the abnormal high pressure distribution is characterized by E-W orientation zoning. The maximum pressure coefficient lies in the Kelasu-Dongqiu-Dina tectonic zones in the center of the Kuqa foreland thrust belt and decreases away from the tectonic zones. The formation of abnormal high pressure was mainly related with the intense tectonic compression in the Early Pleistocene time, and tectonic uplifting, undercompaction and hydrocarbon generation were secondary factors contributing to abnormal high pressure. Under the rapid and intense tectonic compression in the Early Pleistocene, the rock framework firstly undertook 1/4.of the compression stress and the other was borne by the pore fluids. Due to the presence of great seal of gypsum-salt or gypsum-mudstone beds in the Paleogene, the pressure of pore fluids increased rapidly and led to the abnormal high pressure in the Kuqa foreland thrust belt. The abnormal high pressure has important impacts on hydrocarbon accumulation. It is one of the necessary conditions for formation of large oil and gas fields in the Kuqa foreland thrust belt.

关键词： abnormal high pressure formation mechanism oil and gas reservoir Kuqa foreland thrust belt Tarim basin.

Hydrocarbon accumulation in network and its application in the continental rift basin

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Science china Earth Sciences 2008年第S2期51卷 88-100页

作者： PANG XiongQi1,2.CHEN DongXia1,ZHANG ShanWen3.HAO Fang1,LIU Zheng1,LIU KeYu3.SONG GuoQi4.WANG YongShi4.LUO XiaoRong5 & WU XiaoChun61 State Key Laboratory of Petroleum Resource and Prospecting,{3. University of Petroleum,Beijing 102.4.,china 2.Basin and Reservoir Center,{3. University of Petroleum,Beijing 102.4.,china 3.SINOPEC Shengli Oilfield,Dongying 2.7051,china 4.CSIRO Petroleum,P. O. Box 113.,Bentley,WA 6102.Australia 5 institute of geology and Geophysics,{3. Academy of Science,Beijing 10002.,china 6 china National Petroleum Corporation,Beijing 10072.,china chinese Univ Petr State Key Lab Petr Resource & Prospecting Beijing 102249 Peoples R China chinese Univ Petr Basin & Reservoir Ctr Beijing 102249 Peoples R China SINOPEC Shengli Oilfield Dongying 257051 Peoples R China CSIRO Petr Bentley WA 6102 Australia chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China china Natl Petr Corp Beijing 100724 Peoples R China

The concept of hydrocarbon accumulation in network was presented on basis of the overall analysis of the formation and evolution characteristics of the continental faulted basin and of the systemic re-search on the major controlling factors on the hydrocarbon accumulation. The hydrocarbon accumu-lation in network can be defined as hydrocarbon accumulation in a three-dimensional network system which is constituted by the hydrocarbon migration passages under multiple dynamics,following the hydrocarbon generation from source rocks. The research shows that the hydrocarbon accumulation in network is composed of four elements,i.e.,hydrocarbon source (source rock kitchen),hydrocarbon accumulation terminal (trap),network pathway connecting source and terminal (transporting system),and network potential driving hydrocarbon migration in the network pathway (migration dynamics). Compared with other networks,hydrocarbon accumulation in network has three basic characteristics: the irreversible geological process of material and information flow in the network; the loss of material and information in the flow process in the network; the multiple dynamics in the flow process. Interac-tion of all the elements in the geological process can be called hydrocarbon accumulation in network. There are three basic models for hydrocarbon accumulation in network,that is,hydrocarbon accumu-lation in the network source area,hydrocarbon accumulation in the network pathway,and hydrocarbon accumulation in the network terminal. The key in the application of the hydrocarbon accumulation models in network in practice is to confirm the major accumulation stage and the function range of the four elements controlling the hydrocarbon firstly,to predict the profitable accumulation region by su-perposition of the favorable areas confirmed by four elements consequently,and to evaluate the oil-bearing property of the trap as well as confirm drilling targets. This paper takes the Dongying De-pression in the

关键词： continental rift basin hydrocarbon accumulation theory hydrocarbon network hydrocarbon accumulation in network Bohai Bay Basin

Microscopic scale mineralization characteristics of kerogen in microfine disseminated gold ores by using a variety of microbeam analysis techniques

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chinese Science Bulletin 1999年第S2期44卷 252-254页

作者： LlU Shirong~1, SUN Zhenya~2.and SHAO Shuxun~1 1. institute of Geochemistry, chinese Academy of Sciences, Guiyang 550002.{2. 2. Wuhan University of Technology, Wuhan 4.0070,{2. institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Wuhan University of Technology Wuhan 430070 China

ORGANIC minerogenesis is one of the important studies in the field of low-temperature mineralization. Ithas been well documented that organic matter plays a very important role in the transport, precipitationand enrichment of gold in the process of mineralization of gold deposits. We have found that manyresearches mainly employed the organic geochemical and experimentally geochemical methods to explorethe role of organic matter in minerogenesis. As kerogen is dispersed in ores and possesses microscopic geological characteristics as observed in its inner parts, little information has been developed about the geological phenomena of minerogenesis developed in the inner part of kerogen. We have adopted a variety ofsophisticated microbeam analysis techniques in the study of microscopic metasomatism and characteristicsof gold occurrence developed in the inner parts of kerogen from the ores of the Yata microfine disseminat-

关键词： microbeam analysis kerogen microfine disseminated gold deposit.