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Discovery of Cu-Zn,Cu-Sn intermetallic minerals and its significance for genesis of the Mianning-Dechang REE Metallogenic Belt,Sichuan Province,china

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Science china Earth Sciences 2006年第6期49卷 597-603页

作者： XIE Yuling1, HOU Zengqian2. XU Jiuhua1, YUAN Zhongxin2. BAI Ge2.& LI Xiaoyu3 1. Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, china 2. Institute of Geology, Chinese Academy of geological Sciences, Beijing 100037, china 3. The 109th geological Team, Sichuan Bureau of Mineral Exploration, Chengdu 610100, china 1. Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China 2. Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China 3. The 109th geological Team Sichuan Bureau of Mineral Exploration Chengdu 610100 China

Mianning-Dechang Himalayan REE Metallogenetic Belt in Sichuan Province lies along the western margin of the Yangtze Craton. We have conducted detailed mineralogical studies on ore minerals collected from Maoniuping and Dalucao, the two largest deposits in the belt. With optical microscope, SEM/EDS, and EPMA, three rare intermetallic minerals, i.e., zinccopperite (Cu2.n), Sn- bearing native copper, and Cu-bearing jupiter were found to occur in the main ore along with barite, fluorite, apatite, sulfide and bastnaesite. Since the conditions under which zinccopperite and Sn- bearing native copper formed are quite unique, finding of these minerals, for the first time in domestic REE deposits, has significant implications for the genesis of the ore deposits in which they occur. In comparison with Cu-Zn intermetallic minerals in other occurrences, we propose that the formation of this REE metallogenetic belt is associated with fast upwelling of the Himalayan magma from deep source.

关键词： Mianning-Dechang REE metallogenetic belt, Cu-bearing intermetallic minerals, EPMA, genesis significance, deep source magmatic activity.

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Cesium accumulation by bacterium Thermus sp. TibetanG7:hints for biomineralization of cesium-bearing geyserite in hot springs in Tibet,china

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Chinese Science Bulletin 2007年第19期52卷 2680-2686页

作者： WANG HaiLei1,2.3, ZHENG MianPing1,2.3 & HUANG XiaoXing4.1 Institute of Mineral Resources, Chinese Academy of geological Sciences (CAGS), Beijing 100037, china 2.R&D {2. for Saline Lake and Epithermal Deposits, CAGS, Beijing 100037, china 3 Open Laboratory of Saline Lake Resourses and Environment, CAGS, Beijing 100037, china 4.Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100081, china Institute of Mineral Resources Chinese Academy of Geological Sciences (GAGS) Beijing 100037 China

The bacterium Thermus sp. TibetanG7, isolated from hot springs in Tibet, china, was examined for the ability to accumulate cesium from solutions. Environmental conditions were simulated and the effects of pH, K+, Na+ and K+-regimes were then studied to determine the possible role of the bacterium in the formation of cesium-bearing geyserite around these hot springs. In despite of the inhibition of K+ and Na+, the bacterium Thermus sp. TibetanG7 revealed noticeable accumulation of cesium from solutions, with maximum accumulations of 53.4. and 4..4. μmol Cesium/g cell dry weight in Na+ and K+ inhibition experiments, respectively. The accumulation of cesium by this microorganism is rapid, with 4.%―50% accumulated within the first 5 min. K+-deficient cells showed a much higher capacity of cesium accu- mulation compared with K+-sufficient cells. It is evident that the bacteria within the genus thermus play a significant role in the cesium assembly. The formation of cesium-bearing geyserite is also considered.

关键词：铯元素沉积物硅华生物矿化

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NEW CONCEPTS IN GLOBAL TECTONICS——A Brief Introduction of the Theory of Integrated Polygenetic Geotectonics

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Geotectonica et Metallogenia 2002年第1期26卷 108-112页

作者： XIANG Jixi1, WANG Daojin2.and XIANG Fan3(1. development &research {2. of{4., Beijing 100083,{4. 2. Changsha Institute of Geotectonics, CAS, 96 Tongzipo Road, Changsha 4.0013,{4. 3. Anhui Province geological survey, Hefei 2.0001,{4.) development & research {2. of china geological survey Beijing 100083 China Changsha Institute of Geotectonics CAS 96 Tongzipo Road Changsha 410013 China Anhui Province geological survey Hefei 230001 China

Since 1993, the first author has expanded his research on geotectonics from china to the globle, and has put forward his own new concepts in global tectonics: Theory of Integrated Polygenetic Geotectonics. In 2.01, he and his coworkers published their works: two maps and a detailed explanatory note by {2. Publishing House of china.

关键词： A Brief Introduction of the Theory of Integrated Polygenetic Geotectonics NEW CONCEPTS IN GLOBAL TECTONICS

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MECHANISM OF THE BASIN-MOUNTAIN METALLOGENIC SYSTEM IN HIMALAYAN PERIOD IN SANJIANG CONCENTRATION AREA,SOUTHWEST china

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地学前缘 2000年第S1期7卷 425-426页

作者： Liu Fengshan[WT5,5”BX](china geological {2.,MLR,Beijing 100083,china)

Sanjiang (Jinshajiang River,Lancangjiang River and Nujiang River) concentration area in southwest china is within the Tethys\|Himalayan tectonic domain,and it is the main area where develops Himalayan movement and relative ore deposits,such as Yulong super large Cu\|Mo deposit,Jinding super large Pb\|Zn deposit,etc ,in West *** it is a best place to study Himalayan movement and metallogeny.1 Metallogenic geological background Sanjiang concentration area has passed complex Tethys tectonic {2. before Cainozoic era,and it begins Himalayan inland basin\|mountain tectonic {2. at the end of Yanshan *** commonly accepts autochthonous platform type deposits since Mesozoic era,and the basin\|mountain tectonic pattern has already *** metamorphic terrains and paleo\|Tethys orogenic belts become “mountains”,as well as microplateforms sink to become “basins”.Comparing to Mesozoic basins,Eogene basins are many smaller garben\|type extension basins or strike\|slip extension basins on the background of big large basins.

关键词： Himalayan mineralization metallogenic system Sanjiang co ncentration area

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research on forecasting model of sandstone deformation rate during sine wave loading segment under the lag effect

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Science china(Technological Sciences) 2010年第5期53卷 1442-1449页

作者： LIU Jie1,2.LI JianLin1,2.QU JianJun1,ZHOU JiFang3,ZHANG ChaoFeng3 & LI JianWu1 1Key Laboratory of geological Hazards on Three Gorges Reservoir Area,Ministry of Education,china Three Gorges University,Yichang 4.3002.china 2.ollege of Civil and Hydropower Engineering,china Three Gorges University,Yichang 4.3002.china 3Er’tan Hydropower development Company,Ltd.Chengdu 61000,china 1. Key Laboratory of geological Hazards on Three Gorges Reservoir Area Ministry of Education China Three Gorges University Yichang 443002 China2. College of Civil and Hydropower Engineering China Three Gorges University Yichang 443002 China3. Er’ tan Hydropower Development Company Ltd. Chengdu 61000 China

To reduce data variance caused by individual differences of different samples,a new experimental method is proposed by loading and unloading the axial forces with different frequencies and different waves of a certain load amplitude to the same rock sample without damaging *** time segments are defined and fractionized into segments I and Ⅱ.Criterions for seg-mentation,definitions of relevant parameters and empirical analysis are also offered *** the course of sinusoidal loading,the serious peak value dislocation of the displacement variation rate and the loading rate is defined as peak ***,the definition of the apparent tangent modulus is put forward and the linear relation between it and the vertical force in the frequency of 0.1,0.2.0.5 Hz sinusoidal loading segment is confirmed to be ever-present on the basis of the test *** the calculating formula of the deformation rate in non-lag time is *** is thus suggested that the deformation rate should be codetermined by the loading rate df/dt and instant load f(t),which well explains the peak dislocation of the time-variable curve peak value of dl/dt and deformation rate of df/*** the lag time derivation model is established and by comparing the calculated values with the measured ones,it is demonstrated that the above formula offers a better simulation of the sandstone deformation rate in the sinusoidal loading segment,with the load amplitude being 96 kN and the frequency ranging from 0.1 Hz to 0.5 Hz.

关键词： lag time segments peak shifting phenomenon apparent tangent modulus deformation rate

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The Cretaceous tectonic event in the Qiangtang Basin and its implications for hydrocarbon accumulation

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Petroleum Science 2010年第4期7卷 466-471页

作者： Li Yalin Wang Chengshan Li Yongtie Ma Chao Wang Licheng Peng Shaonan State Key Laboratory of geological Processes and Mineral Resources research {2. for Tibetan Plateau Geology China University of Geosciences Beijing 100083 China Petroleum Exploration and development research Institute PetroChina Beijing 100083 China

The tectonic event during Cretaceous and its relationship with hydrocarbon accumulation in the Qiangtang Basin is discussed based on zircon U-Pb dating and the study of deformation, thermochronology and hydrocarbon formation. LA-ICPMS zircon U-Pb dating indicates that the tectonic event took place during the Early-Late Cretaceous （12.-75Ma）. The event not only established the framework and the styles of structural traps in the basin, but also led to the cessation of the first hydrocarbon formation and the destruction of previous oil pools. The light crude oil in the basin was formed during the second hydrocarbon formation stage in the Cenozoic, and ancient structural traps formed during the Cretaceous event are promising targets for oil and gas exploration.

关键词： Qinghai-Tibet plateau Qiangtang Basin tectonic event Cretaceous hydrocarbon accumulation

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Northernmost paleo-tethyan oceanic basin in Tibet:Geo-chronological evidence from ^(4.)Ar/^(39)Ar age dating of Dur'ngoi ophiolite

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Chinese Science Bulletin 2001年第14期46卷 1203-1205页

作者： CHEN Liang, SUN Yong, PEI Xianzhi, GAO Ming, FENG Tao, ZHANG Zhongqing & CHEN Wen1. Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, china 2. Department of Geology, Northwest University, Xi’an, 710069, china 3. Institute of Geology, Chinese Academy of {2. Sciences, Beijing, 100037, china Laboratory of Continental Dynamics Northwest University Xi’an China Department of Geology Northwest University Xi’an China Institute of Geology Chinese Academy of Geological Sciences Beijing China

Whole rock 4.Ar/39Ar age dating has been conducted on a basalt sample from Dur’ngoi ophiolite, Qinghai Province, which was reported to be the northernmost pa-leo-tethyan oceanic basin in Tibet. A high temperature pla-teau age (34..3±7.9 Ma) with an isochorn age (336.6±7.1 Ma) has been obtained, representing the eruption time of oceanic crust Considering related geological settings, the new age provides constraints on the northernmost pa-leo-tethyan suture zone in Tibet and the tectonic evolution of Paleo-tethys in Northeast Tibet and adjacent areas.

关键词： Dur’ngoi ophlolite 4.Ar -39Ar age Paleo-tethys.

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Strongly peraluminous granites of Mesozoic in Eastern Nanling Range, southern china: Petrogenesis and implications for tectonics

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Science china Earth Sciences 2005年第2期48卷 165-174页

作者： SUN Tao, ZHOU Xinmin, CHEN Peirong, LI Huimin, ZHOU Hongying, WANG Zhicheng & SHEN Weizhou Department of Earth Sciences, Nanjing University, Nanjing 2.0093, china Tianjin Institute of Geology and Mineral Resources, china geological survey, Tianjin 300170, china 1. Department of Earth Sciences Nanjing University 210093 Nanjing China 2. Tianjin Institute of Geology and Mineral Resources China Geological Survey 300170 Tianjin China

The strongly peraluminous granites (SPGs) of Eastern Nanling Range (ENR) are a characteristic of all bearing highly aluminous minerals, such as muscovite±AI-rich biotite± tourmaline±garnet, and lack of cordierite. In respect of petrography, geochemistry, Nd isotope, and single grain zircon U-Pb dating, the representative granite bodies of them are studied. The research shows that these granites were emplaced in two stages, namely 2.8-2.5 Ma BP and J2.3 159-156 Ma BP, belonging to Indosinian and early Yanshanian periods, respectively, and they have low εNd(t) values (-10.6--11.1), high A/CNK, Rb/Sr ratios and tDM values (1887-1817 Ma), and REE's tetrad effect (TE1,3=1.13-1.34.. In comparison with related geology, petrology and chronology of granites in adjacent regions, it is suggested that Indosinian SPGs of ENR formed in the circumstance of post-collisional extension 2. Ma after the major collision of Indosinian Movement (2.8-2.3 Ma BP) in Indo-china Peninsula, and early Yanshanian SPGs formed in the background of back-arc extension setting controlled by paleo-Pacific tectonic domain, and J1, the interval of two stages, is the interim from Tethyan to Pacific tectonic domains in South{2.. These SPGs have similar geological and geochemical characteristics, because they all crystallized from the magma of partial melting of early Proterozoic metasedimentary rocks when the thickened crust (≤50 km) became thinning, decompression, and transmitting of water.

关键词： Nanling Range, strongly peraluminous granite, petrogenesis of granite, South china.

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SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqêntanglha Group in Tibet

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Science china Earth Sciences 2005年第9期48卷 1377-1386页

作者： HU Daogong1, WU Zhenhan1, JIANG Wan1, SHI Yuruo2. YE Peisheng1 & LIU Qisheng1 1. Institute of Geomechanics, Chinese Academy of geological Sciences, Beijing 100081, china 2. Institute of Geology, Chinese Academy of geological Sciences, Beijing SHRIMP Centre, Beijing 100037, china 1. Institute of Geomechanics Chinese Academy of Geological Sciences 100081 Beijing China 2. Institute of Geology Chinese Academy of Geological Sciences Beijing SHRIMP Centre 100037 Beijing China

The Nyainqêntanglha Group is traditionally viewed as the oldest metamorphic basement in the Lhasa block, but its formation age and tectonic setting remain debate. Zircons extracted from the metamorphic sequence of volcanics and intrusions of the Nyainqêntanglha Group, 10 km west of Nam Co in northern Lhasa block, have been investigated by cathodolu- minescence (CL), backscattered (BSE) and dated by ion microprobe (SHRIMP). We conclude that the U-Pb age of 787±9 Ma of zircons from the trondhjemite imposes a constraint on maxi- mum protolith age, and minimum formation age of the Nyainqêntanglha Group is constrained by U-Pb age of 74.±8 Ma of zircons from the granite. The formation age of the Nyainqêntanglha Group is consistent with sedimentary age of Greater Himalayan rocks, showing that they devel- oped coevally in an arc-basin tectonic setting of Neoproterozoic active continental margin along the northern margin of the India shield. The inherited zircons from the tholetiite and granite give older 2.7Pb/2.6Pb ages from 94. to 1766 Ma. The positive εNd( t ) value indicates that the mafic rocks were derived from the depleted mantle, but contaminated by the older continental crustal material. Integrated Nd model age and U-Pb age data provide excellent evidence for the exis- tence of Mesoproterozoic basement in the Lhasa block during Neoproterozoic time.

关键词： Nyainqêntanglha Group, SHRIMP dating, Nd isotope, Neoproterozoic, Tibet.

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Belowground carbon balance and carbon accumulation rate in the successional series of monsoon evergreen broad-leaved forest

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Science china Earth Sciences 2006年第3期49卷 311-321页

作者： ZHOU Guoyi1, ZHOU Cunyu1, LIU Shuguang2. TANG Xuli1, OUYANG Xuejun1, ZHANG Deqiang1, LIU Shizhong1, LIU Juxiu1, YAN Junhua1, ZHOU Chuanyan1, LUO Yan1, GUAN Lili1 & LIU Yan1 1. Dinghushan Forest Ecosystem research Station, Chinese Academy of Sciences, Guangzhou 510650, china 2. SAIC, EROS Data {2., U.S. geological {4., Sioux Falls, SD 57198, USA 1. Dinghushan Forest Ecosystem research Station Chinese Academy of Sciences Guangzhou 510650 China 2. SAIC EROS Data Center U.S. Geological Survey Sioux Falls SD 57198 USA

The balance, accumulation rate and temporal dynamics of belowground carbon in the successional series of monsoon evergreen broadleaved forest are obtained in this paper, based on long-term observations to the soil organic matter, input and standing biomass of litter and coarse woody debris, and dissolved organic carbon carried in the hydrological process of subtropical climax forest ecosystem—monsoon evergreen broad-leaved forest, and its two successional forests of natural restoration—coniferous and broad-leaved mixed forest and Pinus massoniana forest, as well as data of root biomass obtained once every five years and respiration measurement of soil, litter and coarse woody debris respiration for 1 year. The major results include: the belowground carbon pools of monsoon evergreen broad-leaved forest, coniferous and broad-leaved mixed forest, and Pinus massoniana forest are 2.191 ± 2.38 g·m?2. 16889 ± 1936 g·m?2.and 12.80 ± 1854.g·m?2. respec- tively, in 2.02. Mean annual carbon accumulation rates of the three forest types during the 2.a from 1978 to 2.02.are 383 ± 97 g·m?2.a?1, 193 ± 85 g·m?2.a?1 and 2.3 ± 86 g·m?2.a?1, respectively. The belowground carbon pools in the three forest types keep increasing during the observation period, suggesting that belowground carbon pools are carbon sinks to the atmosphere. There are seasonal variations, namely, they are strong carbon sources from April to June, weak carbon sources from July to September; while they are strong carbon sinks from October to November, weak carbon sinks from December to March.

关键词： monsoon evergreen broad-leaved forest, successional series of restoration, belowground, carbon pool, accumulation rate.

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