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A proposed GSSP for the base of the Middle Ordovician Series： the Huanghuachang section,Yichang, China

Episodes 2005年第2期28卷 105-117页

作者： XiaofengWang SvendStouge Bernd-D.Erdtmann XiaohongChen ZhihongLi ChuanshangWang QingluanZeng ZhiqiangZhou HuimingChen yichanginstituteofgeology＆mineralresources YichangHubei443003China GeologicalMuseum UniversityofCopenhagenΦsterVoldgade5-7DK-1350CopenhagenKDenmark. InstitutfuerAngewandteGeowissenschaften TechnicalUniversityBerlinGermany. Xi＇anInstituteofGeology＆mineralresources Xi＇anShangxi710054China.

The Huanghuachang section near Yichang, southern China meets the requirements of Global Stratotype Section and Point (GSSP) for the base of the Middle Ordovician Series and the yet-to-be-named third stage of the Ordovician System (or lower stage of Middle Ordovician Series). The conodont succession at the section is complete across the Lower to Middle Ordovician series boundary and several excellent phylogenetic lineages of Baltoniodus, Trapezognathus, Periodon, and Microzarkodina are represented. The definition of the base of the Middle Ordovician is proposed to be the first appearance datum (FAD) of Baltoniodus? triangularis in the section. It is followed closely by the FAD of Microzarkodina flabellum, which is taken as a reasonable proxy for the boundary. This level approximates the boundary between the lower and upper intervals of the Azygograptus suecicus graptolite Biozone, and nearly coincides with the base of the Belonechitina henryi chitinozoan *** proposed GSSP for the base of the international Middle Ordovician Series is located in a roadside exposure at the base of Bed (SHod) 16, 10.57 m above the base of the Dawan Formation in the measured Huanghuachang section near Yichang City, southern China. The same faunal succession is also recorded from the Chenjiahe (formerly Daping) section, 5 km to the north of the Huanghuachang section. The proposed boundary horizon can be recognized and correlated globally with high precision in both relatively shallow-water carbonate facies as well as in deep-water graptolite facies.

关键词： GSSP 奥陶纪宜昌市地质分层研究地形特征

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Scheelite Sm-Nd dating and quartz Ar-Ar dating for Woxi Au-Sb-W deposit,western Hunan

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Chinese Science Bulletin 2003年第23期48卷 2640-2646页

作者： PENGJiantang HURuizhong ZHAOJunhong FUYazhou LINYuanxian InstituteofGeochemistry ChineseAcademyofSciencesGuiyang550002China TianjinInstituteofGeology&mineralresources ChineseMinistryofLandandResourcesTianjin300170China

Scheelite Sm-Nd and quartz Ar-Ar dating were accomplished for the Woxi Au-Sb-W deposit in western hu-nan. The results show that the Sm and Nd concentrations of scheelite are relatively high, and Sm/Nd ratios are usually high and variable. In the 147Sm/144Nd vs. 143Nd/144Nd diagram, the disseminated scheelites show a good linear array, which corresponds to an isochron age of 402 6 Ma and an initial 143Nd/144Nd ratio of 0.510544 9 (2s ) with a e Nd(t) value of -30.7. The Ar-Ar age spectra for 2 quartz samples display the saddle shape. The minimum apparent age, plateau age and isochron age of each quartz sample generally overlap within errors; and both the minimum apparent ages of 420 20 and 414 19 Ma coincide well with the scheelite Sm-Nd age. Both Sm-Nd and Ar-Ar dating results reveal that the Au-Sb-W mineralization at Woxi district took place in the Late Caledonian. This is in good agreement with the tectonic evolution of the Xuefengshan district and with some geo-chronological data available for Au, Sb and W deposits in this area. The low initial Nd isotope ratio of scheelites sug-gests that the fluid responsible for Au-Sb-W mineralization at the Woxi is of deep crustal origin and probably originated from the underlying Archaean continental basement rather than the host Proterozoic strata in western Hunan. The con-straints on the mineralization time and on the fluid source provide insight into the genesis of the Woxi deposit.

关键词：白钨矿钐钕石英氩金锑湖南

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Genesis of the Weiquan Ag-Polymetallic Deposit in East Tianshan, China： Evidence from Zircon U-Pb Geochronology and C-H-O-S-Pb Isotope Systematics

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 1100-1122页

作者： DING Hui GE Wensheng DONG Lianhui ZHANG Liangliang CHEN Xiaodong LIU Yan NIE Junjie School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China Xinjiang Bureau of Geology and Mineral Resources Uriimqi 830000 China The Sixth Exploration Institute of Geology and Mineral Resources of Shandong Province Weihai 264209Shandong China Chengdu University of Technology Chengdu 610059 China MCC Capital Engineering & Research Incorporation Limited (CERI) Beijing 100176 China No. 1 Geological Party Xinjiang Bureau of Geology and MineralResources Changji 831100 Xinjiang China

The Weiquan Ag-polymetallic deposit is located on the southern margin of the Central Asian Orogenic Belt and in the western segment of the Aqishan-Yamansu arc belt in East Tianshan,northwestern China. Its orebodies, controlled by faults, occur in the lower Carboniferous volcanosedimentary rocks of the Yamansu Formation as irregular veins and lenses. Four stages of mineralization have been recognized on the basis of mineral assemblages, ore fabrics, and crosscutting relationships among the ore veins. Stage I is the skarn stage(garnet + pyroxene), Stage Ⅱ is the retrograde alteration stage(epidote + chlorite + magnetite ± hematite 士 actinolite ± quartz),Stage Ⅲ is the sulfide stage(Ag and Bi minerals + pyrite + chalcopyrite + galena + sphalerite + quartz ± calcite ± tetrahedrite),and Stage IV is the carbonate stage(quartz + calcite ± pyrite). Skarnization,silicification, carbonatization,epidotization,chloritization, sericitization, and actinolitization are the principal types of hydrothermal alteration. LAICP-MS U-Pb dating yielded ages of 326.5±4.5 and 298.5±1.5 Ma for zircons from the tuff and diorite porphyry, respectively. Given that the tuff is wall rock and that the orebodies are cut by a late diorite porphyry dike, the ages of the tuff and the diorite porphyry provide lower and upper time limits on the age of ore formation. The δ13C values of the calcite samples range from-2.5‰ to 2.3‰, the δ18OH2 Oand δDVSMOWvalues of the sulfide stage(Stage Ⅲ) vary from 1.1‰ to 5.2‰ and-111.7‰ to-66.1‰, respectively,and the δ13C, δ18OH2 Oand δDV-SMOWvalues of calcite in one Stage IV sample are 1.5‰,-0.3‰, and-115.6‰, respectively. Carbon, hydrogen, and oxygen isotopic compositions indicate that the ore-forming fluids evolved gradually from magmatic to meteoric sources. The δ34SV-CDTvalues of the sulfides have a large range from-6.9‰ to 1.4‰, with an average of-2.2‰, indicating a magmatic source, possibly with sedimentary contributions. The206Pb/204Pb,207Pb/204Pb, and208Pb/204

关键词： zircon U-Pb geochronology C-H-O-S-Pb isotopes skarn-type Ag-polymetallic deposit Weiquan East Tianshan China

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Noise Suppression for Micro-seismic on Gas Shale

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 367-368页

作者： XIE Qingming LI Dahua CHENG Lijun WANG Fei HUANG Zhenhua WANG Dayuan Key Laboratory of Shale Gas Exploration Ministry of Land and Resources Chongqing Institute of Geology and MineralResources Chongqing 400042 Chongqing Engineering Research Center for Shale Gas Resource & Exploration Chongqing Institute of Geology andMineral Resources Chongqing 400042 Chongqing Shale Gas Research Centre of State Key Laboratory of Petroleum Resource and Prospecting ChongqingInstitute of Geology and Mineral Resources Chongqing 400042

1 Introduction Gas shale reservoirs have the characteristics with low porosity and permeability, no air-water interface, self- storage, a large area of continuous accumulation, etc. With monitoring the hydraulic fracturing of gas shale reservoir, some key results, fracture direction, distribution, and other geometric features （crack length, width and height）, etc., would be forecasted with micro-seismic data produced by rock fracture. It provides real-time, accurate information for reservoir stimulation.

关键词： GAS reservoirs OIL shales ROCK noise MICROSEISMS HYDRAULIC structures SHALE gas ALGORITHMS

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Evaluation Indexes for High Quality Shale Reservoir of Lower Silurian Longmaxi Formation in Southeast Chongqing

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 127-129页

作者： YUE Feng CHENG Lijun Key Laboratory of Shale Gas Exploration Ministry of Land and Resources Chongqing Institute of Geology and MineralResources Chongqing 400042 China Chongqing Engineering Research Center for Shale Gas Resource & Exploration Chongqing Institute of Geology andMineral Resources Chongqing 400042 China Chongqing Shale gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting Chongqing400042 China

1 Introduction High quality shale reservoirs are considered eco- nomically recoverable. Determination of evaluation indexes for high quality shale reservoirs is crucial to shale gas exploration and exploitation in Chi... 详细信息

关键词： SHALE gas reservoirs NATURAL gas -- Prospecting POROSITY PERMEABILITY GEOLOGY

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Pre-stack Simultaneous AVO Inversion and Lithology Prediction of Shale Gas Reservoir

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 359-360页

作者： WANG Fei CHENG Lijun XIE Qingming HUANG Zhenhua Key Laboratory of Shale Gas Exploration Ministry of Land and Resources Chongqing Institute of Geology and MineralResources Chongqing 400042 China Chongqing Engineering Research Center for Shale Gas Resource & Exploration Chongqing Institute of Geology andMineral Resources Chongqing 400042 China Chongqing Shale Gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting ChongqingInstitute of Geology and Mineral Resources Chongqing 400042 China

Shale gas is mainly gathered in shale in adsorbed and in free forms . Shale gas reservoirs have the characteristics of self-generating and self-preserving, low density, low porosity and low permeability, which make th... 详细信息

关键词： SHALE gas reservoirs OIL shales PETROLOGY SEISMIC prospecting OIL well drilling

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Geotectonic Evolution and Metallogenesis in the Nujiang-Lancang-Jinsha Rivers Area, China

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Journal of Geological Resource and Engineering 2014年第3期2卷 139-150页

作者： Zou Guangfu Zou Xin Mao Ying Mao Qiong Xia Tong Chengdu Institute of Geology and mineralresources China Geological Survey Chengdu 610082 China Department of Psychology Peking University Beijing 100871 China Chengdu Comprehensive Rock and Mineral Testing Center Sichuan Bureau of Geology and Mineral Resources Chengdu 610081China Research Institute of Petroleum Exploration and Development North China Oil Field Company PetroChin Renqiu 062552China China Ocean Press Beijing 100081 China

The studied area lies in the eastern sector of the Tethys. Since the Early Paleozoic, the Nujiang-Lancang-Jinsha Rivers （southwest Sanjiang） area has experienced the geological evolutionary phase of the Paleo-Tethys, Meso-Tethys and Neo-Tethys. The multiple tectonic-magmatic activities have been occurred in the region, which have provided very favorable conditions. According to the regional geological characteristics, Geotectonic position is the area which can be divided into the following tectonic units： Kekexili-Yajiang passive continental margin, Garze-Litang plate junction, Dege-Zhongdian plate, Jinshajiang-Ailaoshan plate junction, Changdu-Simao plate, Lanchangjiang plate junction, Zuogong-Baoshan plate, Nujiang plate junction, Bomi-Tengchong plate and nine mineralization zones （Kekexili-Yajiang mineralization zone, Garze-Litang mineralization zone, Dege-Zhongdian mineralization zone, Jinshajiang-Ailaoshan mineralization zone, Changdu-Simao mineralization zone, Lanchangjiang mineralization zone, Zuogong-Baoshan mineralization zone, Nujiang mineralization zone and Bomi-Tengchong mineralization zone）. The authors discussed that the geotectonic evolution specializes are relative to the main mineralization in this region. These studies show the geotectonic evolution and mineralization in the Nujiang-Lancang-Jinsha Rivers area have gone through eight stages for the Cambrian. Because the tectonic-magmatic mineralization activities have occurred the rich minerals resources and ore deposit types have been forming in this region. Ore deposits may be divided into seven types： massive sulfide type, stratabound type, turbidite type, postmag-matic hydrothermal type, skarn type, porphyry type and ductile shear zone type gold deposit. Deep geological effect of southwest Sanjiang area for deposit and its mineralization and ore prospecting and metallogenic prediction research work, is expected to find new orebody and ore deposit. The study of geotonics and metallogenesis in the

关键词： Geotectonic evolution mineralization ore deposits the Nujiang-Lancang-Jinsha rivers area.

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