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Southeastern extension of the Red River fault zone (RRFZ) and its tectonic evolution significance in western South china Sea

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Science china Earth Sciences 2006年第8期49卷 839-850页

作者： LIU Baoming1,2,3, XIA Bin1, LI Xuxuan1,3, ZHANG Minqiang1,3, NIU Binhua2, ZHONG Lifeng1, JIN Qinghuan1,4.& JI Shaocheng1,5 1. Key Laboratory of Marginal Sea geology and Resources, Chinese Academy of Sciences,Guangzhou 51064., china 2. china university of geosciences (Beijing), Beijing 100083, china 3. Research Center of Science & Technology department, CNOOC, Beijing 100027, china 4. Guangzhou Marine Geological Survey, Ministry of Land & Resources, Guangzhou 510075, china 5. Ecole Polytechnique Montreal, H3C3A7, Canada Key Laboratory of Marginal Sea geology and Resources Chinese Academy of Sciences Guangzhou China china university of geosciences (Beijing) Beijing China Research Center of Science & Technology department CNOOC Beijing China Guangzhou Marine Geological Survey Ministry of Land & Resources Guangzhou China Ecole Polytechnique Montreal Canada

Recent geophysical surveys and basin modeling suggest that the No.1 fault in the Ying- gehai basin (YGHB) is the seaward elongation of the Red River fault zone (RRFZ) in the South china Sea (SCS). The RRFZ, which separates the South china and Indochina block, extends first along the Yuedong fault, offshore of Vietnam, and then continues southward and breaks off into two branches: the Lupar fault and the Tinjia fault. The southern extension of the Lupar fault dies out beneath the NW Borneo while the Tinjia fault extends southeast and reaches the Brunei-Sabah area. According to the gravity and geomagnetic data, and the tectonic evolution of the basins, there are different evolution histories between the Wan’an basin (WAB) and the basins in the Nansha block. The Tinjia fault may be the boundary between the Balingian block and the Nansha block. Hence, the line linking the Yue- dong fault and the Tinjia fault, which both are continental margin faults and strike-slip ones in the geological evolution histories, constitute the boundary between the Indochina and Nansha block. The Lupar fault, in contrast, is an intraplate fault within the Indochina block. The results provide new hints for reconstructing the tectonic evolution history of the RRFZ and the opening of the SCS, and also a framework for hydrocarbon prospecting in the region.

关键词： Red River fault zone, tectonic evolution, fault, extension, western South china Sea.

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A　New　Mid　Early　Pleistocene　Mammalian　FaunaDiscovered　in　Choukoutien，china　and　Its　Application　in　Biostratigraphy

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Journal of Earth Science 1995年第1期14卷 41-47,120页

作者： Cheng Jie(department of geology and Mineral Resources, china university of geosciences,Beijing 100083)Cao Boxun(Faculty of Earth Sciences, china university of geosciences,Wuhan 4.0074.Tian MingZhong(department of geology and Mineral Resources, china Unive

This paper deals with a new Early Pleistocene micromammalian fauna found in Choukonden (Zhoukoudian) and its application in *** new locality (east cave ), discovered in 1985,is located on the north slope of the Taipingshan Hill, about 2 km northeast of the Loc.1 in Choukoutien and is about 14.-150m in altitude. At this locality,abundant fossil mammals are found in thick cave-fissure deposit. This fauna comprises 30mammalian taxa. Based on the comparison of the fauna, as Well as the sporo-pollen, climate events and paleomagnetic polarity section with those in other areas,we come to the conclusion that the sediments (Taipingshan Formation) in east cave were formed during the Period about from 1.67 Ma B. P. to 0.97 Ma B. P., and the fauna is about 1.20 Ma B. P. in ags.

关键词： mid Early Pleistocene micromammalian fauna biostratigraphy Choukoutien.

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Sorption behavior of U(VI), ^(234.U(VI) and ^(238)U(VI) onto fracture-filling clays in Beishan granite, Gansu: Application to selecting the site of high-level radwaste repository in china

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Science china Earth Sciences 2005年第10期48卷 1649-1655页

作者： MIN Maozhong1,2, LUO Xingzhang3, WANG Ju4. JIN Yuanxin4.& WANG Rucheng1 1. department of Earth Sciences, State Key Laboratory of Mineral Deposit Research, Nanjing university, Nanjing 210093, china 2. Center of Materials Analysis, Nanjing university, Nanjing 210093, china 3. department of Environmental Science and Engineering, Nanjing university, Nanjing 210093, china 4. Beijing geology Institute, Nuclear Industry, Beijing 100029, china Nanjing university Nuclear Industry

The first results of sorption experiments of U(VI), 234.(VI) and 238U(VI) onto original (unpurified) fracture-filling clays from No.1 monzonitic granite intrusion, Beishan area, Gansu Province, china are reported. The monzonitic granite intrusion is a potential location for a high-level radwaste (HLW) repository in china. The present experimental results show that the maximum U(VI) sorption reached 92% at near-neutral pH and the distribution coefficient (Kd) was 1226 mL/g. A high sorption capacity of the fracture-filling clays in host rock on radioactive ele-ments is necessary for HLW deep geological disposal repository. No preferential sorption of 234. onto the clays was found. Finally, the sorption of U(VI) onto the clays was also modeled using a surface complexation model.

关键词： HLW geological disposal repository, granite, uranium, radionuclide, clay, sorption.

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Petrogenesis and dating of the Kangding complex,Sichuan Province

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Science china Earth Sciences 2005年第5期48卷 622-634页

作者： CHEN Yuelong 1 , LUO Zhaohua 1 , ZHAO Junxiang, LI Zhihong, ZHANG Hongfei & SONG Biao 3 1. Faculty of Earth Sciences and Natural Resources, china university of geosciences, Beijing 100083, china 2. Faculty of Earth Sciences, china university of geosciences, Wuhan 4.0074. china 3. Beijing SHRIMP Center, Institute of geology, Chinese Academy of Geological Sciences, Beijing 100037, china Faculty of Earth Sciences and Natural Resources China University of Geosciences Beijing China Faculty of Earth Sciences China University of Geosciences Wuhan China Beijing SHRIMP Center Institute of Geology Chinese Academy of Geological Sciences Beijing China

An analysis of major and trace element geochemistry and SHRIMP U-Pb zircon dating of mafic, intermediate, and felsic rocks from the Mianning metamorphic complex of Si- chuan Province was conducted. One of our conclusions is that a majority of the zircons crystal- lized between 721 and 773 Ma in a magmatic regime. The complexes contain early to late Pa- leo-proterozoic relict zircons from ancient continental crust. The oldest age, 24.8 Ma, may rep- resent the basement of the Yangtze block. Overgrowth zircon rims and palingenetic zircons have been observed and dated, and are believed to have formed after crystallization, during Paleozoic and Mesozoic metamorphic-anatexis. We also conclude that depletion of Nb, Ta, HREE, in a spider-diagram normalized to primitive mantle and calc-alkaline association, implies that they formed in island-arc or under-plating settings.

关键词： Kangding complex, zircons, SHRIMP, tectonic setting.

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Lithospheric seismic fabrics of Sulu ultrahigh-pressure metamorphic belt

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Science china Earth Sciences 2005年第5期48卷 585-600页

作者： YANG Wencai 1 , YANG Wuyang 1 , JIN Zhenmin 2 & CHENG Zhenyan 1 1. Institute of geology, Chinese Academy of Geological Sciences, Beijing 100037, china 2. china university of geosciences, Wuhan 4.0074. china Chinese Academy of Geological Sciences Institute of Geology Beijing China china university of geosciences Wuhan China

Calibration of seismic reflectors appearing in the crust of the Chinese continent sci- entific drilling site can be completed through the correlation studies between direct evidences, such as the drill cores, and geophysical signatures; therefore the interpretation of geophysical data could produce reliable results of crustal structure and composition. On the other hand, there are two Cenozoic volcanoes close to the scientific drilling site; analyzing composition of xenoliths existent in the volcanoes and evaluating their seismic velocities can also offer information about the mantle and lower crust. After the calibration via cores and well-logging data, the seismic re- flectors appearing in the UHP belt can be caused by lithological changes within the UHP rock slice, ductile shearing rock-suites, and later fracture zones. Among these sources, ductile shearing resulted in displacement and detachment of original rock-sheets, producing some rock-interbeds of several hundred meters thick that are named the ductile shearing rock-suites. A suite consists of mylonized gneiss and eclogite slices that underwent shearing, becoming the major mechanism responsible to generate regional strong reflections. The UHP rock-slice is characterized by complicated structures and high density, high seismic velocity and high electri- cal resistivity, its thickness is usually less than 11 km. Velocity and density of the gneiss-layer beneath gradually tend to normal with increasing depth. Based on the xenoliths we can infer that the middle crust contains a lot of gneisses, and the lower crust consists of different granulites. The lithospheric mantle has multi-layer structures and consists mainly of spinal lherzolite and harzburgite, implying late Mesozoic lithospheric thinning. The seismic fabrics with different ori- gins were possible products of different geodynamic processes. For instance, the UHP rock-slice was produced by the UHP metamorphic process and the exhumation of subducted supe

关键词： deep seismic reflection, ultrahigh-pressure belt, Sulu china, calibration of reflectors, lithospheric fabrics.

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Zircon and apatite fission track analyses on mineralization ages and tectonic activities of Tuwu-Yandong porphyry copper deposit in northern Xinjiang, china

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Science china Earth Sciences 2007年第12期50卷 1787-1795页

作者： YUAN WanMing1,BAO ZengKuan2,DONG JinQuan2,GUO ZhaoJie3 & DENG Jun1 1 State Key Laboratory of Geological Processes and Mineral Resources,china university of geosciences,Beijing100083,china 2 Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,china 3 department of geology,Peking university,Beijing 100871,china State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing China Laboratory of Nuclear Analysis Techniques Institute of High Energy Physics Chinese Academy of Sciences Beijing China department of geology Peking University Beijing China

The mineralization ages reported in the past in the Tuwu-Yandong copper district not only are different,but also fall into the Hercynian *** study has achieved 9 zircon and 7 apatite fission track analysis *** zircon fission track ages range from 158 Ma to 289 Ma and the apatite ages are between 64.Ma and 14. *** mineralization accords with the regional tectonics in the copper *** consider that the zircon fission track age could reveal the mineralization age based on annealing zone temperature of 14.―300℃ and retention temperature of ～250℃ for zircon fission track,and metallogenetic temperature of 120―350℃ in this ore *** three mineralization epochs have been identified,i.e.,289―276 Ma,232―200 Ma and 165―158 Ma,and indicate occurrence of the min-eralization in the Indosinian and Yanshan *** to apatite fission track ages,the three tectonic-mineralizing epochs are 14.―132 Ma,109―97 Ma and 64.Ma,which means age at about 100℃ after the *** three epochs lasted 14. Ma,108 Ma and about 100 Ma from ～250℃ to ～100℃ and trend decrease from early to *** is shown by the fission track modeling that this district underwent three stages of geological thermal histories,stable in Cretaceous and cooling both before Cretaceous and after 20 Ma.

关键词： mineralization age, tectonic epoch, fission track, zircon, apatite, Tuwu-Yandong, Xinjiang

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Research on the dynamics of the South china Sea opening:Evidence from analogue modeling

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Science china Earth Sciences 2006年第10期49卷 1053-1069页

作者： SUN Zhen1,2, ZHOU Di1, ZHONG Zhihong3, XIA Bin2, QIU Xuelin1, ZENG Zuoxun4.& JIANG Jianqun5 1. CAS Key Laboratory of Marginal Sea geology, South china Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, china 2. CAS Key Laboratory of Marginal Sea geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 51064., china 3. department of Technology, Shenzhen Branch of CNOOC, Guangzhou 51024., china 4. Faculty of Earth Sciences, china university of geosciences, Wuhan 4.0074. china 5. Hainan Oil & Gas Exploration Company, Liaohe Oilfield Petrochina, Panjin 124.10, china CAS Key Laboratory of Marginal Sea geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou China CAS Key Laboratory of Marginal Sea geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China department of Technology Shenzhen Branch of CNOOC Guangzhou China Faculty of Earth Sciences China University of Geosciences Wuhan China Hainan Oil & Gas Exploration Company Liaohe Oilfield PetroChina Panjin China

Independent of Indochina extrusion, the South china Sea experienced a process from passive continental rifting to marginal sea drifting. According to the fault patterns in the Beibu Gulf basin and the Pearl River Mouth basin, the continental rifting and early spreading stage from 32 to 26 Ma were controlled by extensional stress field, which shifted clockwise from southeastward to south southeastward. From 24.Ma on, the sea spread in NW-SE direction and ceased spreading at around 15.5 Ma. Integrated geological information with the assumption that the South china Sea developed along a pre-Cenozoic weakness zone, we did analogue experiments on the South china Sea evolu- tion. Experiments revealed that the pre-existing weakness zone goes roughly along the uplift zone between the present Zhu-1 and Zhu-2 depression. The pre-existing weakness zone is composed of three segments trending NNE, roughly EW and NEE, respectively. The early opening of the South china Sea is accompanied with roughly 15° clockwise rotation, while the SE sub-sea basin opened with SE extension. Tinjar fault was the western boundary of the Nansha block (Dangerous Ground), while Lupar fault was the eastern boundary of the Indochina, NW-trending rift belt known as Zengmu basin developed between above two faults due to block divergent of Indochina from Nansha. In the experiment, transtensional flower structures along NW-trending faults are seen, and slight inversion occurs along some NE-dipping faults. The existence of rigid massifs changed the orientations of some faults and rift belt, and also led to deformation concentrate around the massifs. The rifting and drifting of the South china Sea might be caused by slab pull from the proto South china Sea subducting toward Borneo and/or mantle flow caused by India-Asia collision.

关键词： South china Sea, rifting and drifting, clockwise rotation, analogue modeling, rigid massifs.

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Jiaodong Granitoids and Gold Mineralization

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Journal of Earth Science 1995年第1期14卷 71-78页

作者： Chen Guangyuan Sun Daisheng Shao Yue(department of geology and Mineral Resources, china university of geosciences, Beijing 100083)

Gold Production in Jiaodong started in 598 AD, reached 89.5% of the country's total output in 1078 AD ac is now still on the topmost in china. The Jiaodong Group forming the Neoarchaean crystalline basement belongs to the magnetite tyep consisting in the main of gold-bearing basic to intermediate-acidic matavolcanics. The Mesozoic granitoids generated from partial remelting of the Jiaodong Group consequently belong also to the I-type and magnetite series by showing strong petrochemical, mineralogical and crystallochemical inheritance to the Jiaodong Group .There are three major types of granitoids hosting gold deposits in Jiaodong, namely the Lingong monzonitic grenite (J2 ), the Guojialing granodiorite (J3 )and the Kunyushan monzonitic granite (K1). the isotopic chronological data indicate that there are also three stages of gold mineralization (K1 )corresponding to the formation of the three major types of gramitoids, but the former is not the direct Product of magmatic differentiation from the latter .The Mesozic tectonism and dynamometamorphism on mobile margin of continental Plate Played an important role in both deliverance of gold from source rocks into hydrothermal solution and later deposition from the hydrothermal solution to form gold deposits. Mineraloglcal criteria of redox conditions of granitoids, mineraloglcal, petrochemical and crystallochemical data favorable for gold mineralization in general, and especially in Jiaodong granitoids, are summarized. Difference in gold mineralization in the three major types of Jiaodong grauitoids is also roughly given.

关键词： granitoids gold mineralization,Jiaodong.

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Paleogene Sequence Stratigraphy and Sea Level Change Cycles in South Xizang (Tibet) - Last Stage in Eastern Neo-Tethyan Evolution

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Journal of Earth Science 1996年第1期15卷 122-131页

作者： Shi Xiaoying Wan Xiaoqiao Jia Caiping (department of geology and Mineral Resources, china university of geosciences, Beijing 100083)

The marine Paleogene at Gangba, south Tibet is characterized by shallow water deposits and in vertical succession shows a clear facies change from fluvial plain through carbonate platform to retro-platform mud flat. From the bottom of Danian to Upper Priabonian, nine 3rd -order depositional sequences are recognized, which in turn make up four supersequences and constitute two clear transgression-regression cycles. These requences were developed in a tectonic setting of strong compression resulted from the collision between the Indian and Eurasian plates. Between the Paleocene and Eocene, there exists an important hiatus that has consumed at least 5.5 Ma of deposition. This unconformity is thought to be created by the basement uplift coupled with eustatic fall and marks the basin transformation from epicontinental sea to remnant hay. The rapid basement subsidence and relative sea level rise in Late Eocene are thought to be caused by the loading flexure of the Eurasian continent onto the Indian plate, which resulted in the southward migration of depocenter in the epoch.

关键词： Paleogene sequence sea level cycle tectonic evolution south Tibet.

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Sequence Stratigraphy of Upper Proterozoic Glacigenous Rocks in Southeastern Margin of Yangtze Platform

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Journal of Earth Science 1996年第1期15卷 38-45页

作者： Jiang Ganqing Wang Ziqiang Zhang Linghua (department of geology and Mineral Resources, china university of geosciences, Beijing 100083)

The Upper Proterozoic glacigenous rocks in the southeastern margin of the Yangtze platform were accumulated in a glacially influenced marine environment with extension set- ting. Two type I depositional sequences have been identified in the glacioclastic sediments the their boundaries enhanced by both tectonism and the incision of glaciation. The lower sequence (SQ1), comprising Changan and Fulu formations (Guangxi Province), Jiangkou and Xiangmen formations(Hunan Province) and their equivalents, is bounded by erosional unconformities both at the base and on the top. The upper sequence (SQ2), composed mainly of Nantuo Formation and its equivalents, is confined by an erosional unconformity at the base and covered by an exposure surface of karstification on the top. The depositional systems tracts are difficult to be distinguished directly and mainly characterized by the variation in glacioclastic supplies. Two types of episodic parasequeuces can be identified in the glacigenous rocks and are related to the evolution of depositional systems tracts. Both the sequences and parasequences are caused by autocyclic mechanism. The present research shows that the Upper Proterozoic glacigenous deposits are of significance for the analysis of the tectonic evolution of the Late Precambrian basin in South china.

关键词： glacigenous rock sequence stratigraphy Upper Proterozoic Yangtze platform.

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