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China Geology 2024年第1期7卷 153-156页

作者： Xiang-yuan Yue Qian Zhang Jun-jun Zhang Wei Zhang Jing Zhang Zhi-quan Jia Li-ping Luo Institute of Multipurpose Utilization of Mineral Resources Chinese Academy of Geological SciencesChengdu610041China Shandong Lunan Geology and Exploration Institute(No.2 brigade of Shandong BGMR) Jining272100China Sichuan Shudao Advanced Material Science Group Co.Ltd. Chengdu610041China No.3 geological brigade of Sichuan Province Chongzhou611230China

*** Pegmatite hosts important resource of rare metals,e.g.,lithium(Li)and beryllium(Be).In recent years,increasingly more studies were dedicated to characterize and unravel the formation of pegmatite-type deposits,for which accurate dating of pegmatite formation and mineralization is *** Songpan-Ganzi orogenic belt is a major rare metal metallogenic belt in China,hosting many important pegmatite-type Li deposits,including the Lijiagou,Dangba,Jiajika,Yelonggou,Cuola,and *** age data(mica Ar-Ar and zircon/cassiterite U-Pb)from these Li deposits are sparse,ranging from 210 to 152 ***,obtaining reliable zircon U-Pb dates can be a challenge due to the strong decidualization in *** a result,the formation and mineralization ages of these rare metal pegmatites remain controversial,which hampers the development of pegmatite-type metallogenic model for the Songpan-Ganzi orogenic belt.

关键词： dating metallogenic zircon

In situ Analysis of Major Elements, Trace Elements and Sr Isotopic Compositions of Apatite from the Granite in the Chengchao Skarn-Type Fe Deposit, Edong Ore District： Implications for Petrogenesis and Mineralization

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Journal of Earth Science 2018年第2期29卷 295-306页

作者： Zhenghan Li Dengfei Duan Shaoyong Jiang Ying Ma Hongwei Yuan School of Earth Sciences China University of Geosciences Wuhan 430074 China Collaborative Innovation Center for Exploration of Strategic Mineral Resources China University of Geosciences Wuhan 430074 China Faculty of Earth Resources China University of Geosciences Wuhan 430074 China State Key Laboratory of geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China The First geological brigade of Hubei geological Bureau Huangshi 435100 China

Major elements, trace elements and Sr isotopic compositions of apatite from the granite in the Chengchao skarn-type Fe deposit of Edong ore district of Middle-Lower Yangtze River metallogenic belt were measured using EMPA （electron microprobe）, LA-ICP-MS （laser ablation inductively coupled plasma mass spectrometer） and LA-MC （multicollector）-ICP-MS methods in order to reveal the petroge- netic and metallogenic significance of the skarn-type iron deposits. The results show that the apatite in Chengchao granite is fluorapatite, which displays slight variation in major elements. The REE distribution pattern of the apatite is similar to that of the whole rocks, with strong negative Eu anomaly and low Sr/Y ratio. The concentration of Mn in apatite is low （140 ppm-591 ppm） and the Sr isotopic composition shows a limited variation from 0.706 9 to 0.708 2. The high oxygen fugacity of the Chengchao granite, implied by the low Mn content in apatite, is possibly attributed to contamination of the gypsum from sedimentary rock strata, which has long been thought to be an important factor that controls the Fe mineralization in the Middle-Lower Yangtze River metallogenic bell This study also proves that the Eu/Eu＊ value and Sr/Y ra- tio in apatite can be effectively used to identify the adakitie affinity. The in situ Sr isotope analysis of apatite is in consistent with the bulk rock analysis, which indicates that the apatite Sr isotope can represent the ini- tial Sr isotopic compositions of the magma. The Sr isotope and negative Eu anomaly in apatite imply that the Chengchao granite is likely sourced from crust-mantle mixed materials.

关键词： apatite in situ analysis Sr isotopes trace elements adakite identification oxygen fugacity.

Accurate detection method of high-density polyethylene fi lm leakage location based on secondary electric potential difference

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Applied Geophysics 2022年第3期19卷 447-457,472页

作者： Jiang Fu-Yu Qiao Pei-Xuan Gao Li-Kun Chen Hai-Jun School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China The First geological brigade of Jiangsu Bureau of Geology and Mineral Exploration Nanjing 210041China Geotechnical Engineering Department Nanjing Hydraulic Research InstituteNanjing 210029China

High-density polyethylene(HDPE)film leakage location detection is frequently accomplished using the double-electrode *** electric potential and potential difference are the main physical parameters in the double-electrode *** to the impact of the complex geoelectric environment,the electric potential and the electric potential difference are not sensitive enough to respond to minimal *** tiny leaking area cannot be precisely located using the electric potential and electric potential *** the COMSOL Multiphysics software,this study created a standard geoelectric model of the double-electrode *** calculated a new parameter—the G parameter through secondary electric potential difference—based on the response characteristics of the electric potential and the electric potential difference while the HDPEﬁlm is *** experiment demonstrates that the G parameter is more sensitive than the electric potential and electric potential difference for detecting the leaking area of HDPE *** G parameter is more effective at detecting leakage than the electric potential and electric potential *** results of this study can be used to locate HDPEﬁlm leakage areas in a landﬁll.

关键词： landfill environmental geophysics high-density polyethylene film pollution prevention

Morphological reconstruction of the Ediacaran macroalga Gesinella from South China

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Journal of Palaeogeography 2023年第1期12卷 82-95页

作者： Yu-Lan Li Feng Tang Ye Wang Ji Li Ming-Sheng Zhao Jun-Ling Liao Yue Wang College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025Guizhou ProvinceChina Guizhou Bureau of Geology and Mineral Resources 111 Geological BrigadeGuiyang 550081Guizhou ProvinceChina Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China College of Paleontology Shenyang Normal UniversityShenyang 110034Liaoning ProvinceChina

Macroalga Gesinella,a carbonaceous compression,is found in the upper part of Doushantuo Formation(Ediacaran)in the Yangtze Platform of South ***,it is composed of a thallus(including an oval or oblong lamina and a short-rod-like stipe)and a holdfast(including a cone-shaped rhizome and many filamentous rhizoids).The cone-shaped rhizome connects with the stipe and the long rhizoids grew on the rhizome,meaning that the rhizome grew downwards and inserted into the sediment,while the rhizoids grew in the gaps between the sediment grains to anchor its body on the *** the lamina,branching and/or unbranching filaments are regularly distributed,so that the oval or oblong lamina can be interpreted as a sac-like body that has been *** filaments on the lamina extend from the three-dimensionally preserved stipe,suggesting that the short-rod-like stipe may have been flexible to support the sac-like body in the water *** tissue and organ differentiations,Gesinella can be regarded as a eukaryotic macroalga and a high-level *** on measurement and analysis of 108 specimens,the Ediacaran macroalga Gesinella from South China can be divided into three stages:juvenile stage(10 mm maximum width)that grew sideways.

关键词： Thallus Holdfast Filaments Ediacaran Gesinella South China

Hydrothermal Systems Characterized by Crustal Thermally-dominated Structures of Southeastern China

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1003-1013页

作者： WANG Guiling GAN Haonan LIN Wenjing YUE Gaofan YAN Xiaoxue LI Tingxin ZHANG Wei MA Feng Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangHebei 050061China Technology Innovation Center for geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuangHebei 050061China

Southeastern China(SE China)is located in the Pacific tectonic domain and has experienced a series of tectono-magmatic events induced by the subduction of the Paleo-Pacific Plate since the late *** subduction formed a series of NE-NNE oriented faults under a NW-SE regional stress field,along which a number of thermal springs *** studies have focused on the genesis mechanism of specific geothermal fields in SE China,but the general characteristics of hydrothermal systems in SE China remains *** this study,we investigate the correlation between geothermal activity,hydrochemical type and regional faults by studying the distribution of hydrothermal activity and geochemical properties of typical hydrothermal systems in SE *** hydrothermal systems in SE China have a crustal thermally-dominated structural origin unique to the specific geological and tectonic conditions of the Eurasian Plate *** upwelling of the asthenosphere and the widespread granitoids with high radiogenic heat production in SE China provide major heat sources for regional geothermal *** NE-oriented crustal thermally-dominated faults are critical for the formation of geothermal anomalies and NW-oriented extensional faults have created favorable conditions for meteoric water infiltration,transportation and the formation of thermal springs.

关键词： hydrothermal system geothermal reservoir geothermal activity thermal lithosphere Southeastern China

Genesis of the Taishanmiao Au Deposit in the Ningshan-Zhenan Ore Field,South Qinling Orogen,China:Evidence from Geochemical,Geochronological and S-Pb-H-O Isotopical Study

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 993-1009页

作者： GAO Zuoyu LIU Yunhua SUN Naiquan LI Yuntao LI Bo School of Earth Science and Resources Chang’an UniversityXi’an 710054China School of geological and Surveying&Mapping Engineering Chang’an UniversityXi’an 710054China No.9 geological brigade of Xinjiang Bureau of Geo–exploration and Mineral Development Urumqi 810000China College of Earth Sciences Guilin University of TechnologyGuilinGuangxi 541004China

The Taishanmiao Au deposit is in the western part of the Ningshan-Zhenan ore field,in the South Qinling *** on geological and geochemical features,we propose that the Taishanmiao Au deposit is a magmatichydrothermal type of *** samples have high SiO_(2),K_(2)O+Na_(2)O contents and differentiation index values,low CaO,MgO,P_(2)O_(5),and TiO_(2)contents,are enriched in high field-strength elements,and depleted in large ion lithophile *** stable isotopeδ^(34)S values of pyrite vary from 6.8%-7.8%,and the H-O isotopic compositions of quartz from quartzpyrite veins indicate the ore-forming fluid is a mixture of a small amount of magmatic-hydrothermal solution and *** isotope ratios of pyrite and silicalite can show that the ore-forming materials were derived from a mixed source containing mantle and crustal *** the same time,the LA-ICP-MS U-Pb dating of monzogranite is 198.4±4.2 *** with the regional geological background,the intracontinental extension in the late collisional orogeny and large-scale lithospheric thinning associated with mantle uplift may lead to large-scale mineralisation in the region.

关键词： stable isotope metallogeny quartz-pyrite veins collisional orogeny South Qinling Orogen

Petrogenesis and tectonic implications of the Silurian adakitic granitoids in the eastern segment of the Qilian Orogenic Belt,Northwest China

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Acta Geochimica 2024年第1期43卷 72-86页

作者： Jiao-Long Zhao Xiao-Jun Huang Pei-Qing Hu Zhen-Xi Yang Ying Fan Er-Teng Wang Fu-Bo Yang Jing-Yu Zhang School of Earth Sciences Key Laboratory of Mineral Resources in Western China(Gansu Province)Lanzhou UniversityLanzhou 730000China Nuclear Industry 247 brigade Tianjin North China Geological Survey BureauTianjin 301800China Fourth Institute of geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources Jiuquan 735000China

Geodynamic mechanism responsible for the generation of Silurian granitoids and the tectonic evolution of the Qilian orogenic belt remains controversial. In this study, we report the results of zircon U–Pb age, and systematic whole-rock geochemical data for the Haoquangou and Liujiaxia granitoids within the North Qilian orogenic belt and the Qilian Block, respectively, to constrain their petrogenesis, and the Silurian tectonic evolution of the Qilian orogenic belt. Zircon U–Pb ages indicate that the Haoquangou and Liujiaxia intrusions were emplaced at423 ± 3 Ma and 432 ± 4 Ma, respectively. The Haoquangou granodiorites are calc-alkaline, while the Liujiaxia granites belong to the high-K calc-alkaline *** are peraluminous in composition and have relatively depleted Nd isotopic [ε_(Nd)(t) =(-3.9 – + 0.6)] characteristics compared with regional basement rocks, implying their derivation from a juvenile lower crust. They show adakitic geochemical characteristics and were generated by partial melting of thickened lower continental crust. Postcollisional extensional regime related to lithospheric delamination was the most likely geodynamic mechanism for the generation of the Haoquangou granodiorite, while the Liujiaxia granites were generated in a compressive setting during continental collision between the Qaidam and Qilian blocks.

关键词： Silurian adakitic granitoids Petrogenesis Tectonic setting Qilian Orogenic Belt

DISCOVERY OF NATIVE CHROMIUM IN XIZANG (TIBET)

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Chinese Science Bulletin 1981年第11期26卷 1014-1017页

作者：朱明玉柳云仙 The Fifth geological brigade Geological Bureau of Xizang Institute of Multi-purpose Utilization of Mineral Resources

Studying primary platinum minerals in chromite ores from an ultrabasic mass in Xizang in 1975, we discovered a bright-white isotropic metallic mineral with high hardness and high reflectance. The mineral was determine... 详细信息

关键词： metallic isotropic chromium platinum grains hardness reflectance finer silver reduc

Conversion relationship of rainfall-soil moisture-groundwater in Quaternary thick cohesive soil in Jianghan Plain,Hubei Province,China

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China Geology 2020年第3期3卷 462-472页

作者： Tian-wen Liu Cheng Hu Qing Wang Jun Li Kun Huang Zhi-hua Chen Ting-ting Shi School of Environmental Studies China University of GeosciencesWuhan 430074China Central South China Center for Geoscience Innovation Wuhan Center of Geological SurveyWuhan 430205China Three Gorges Research Center for Geohazards Ministry of EducationWuhan 430074China Sixth geological brigade of Hubei geological Bureau Xiaogan 432000China

The scientific field test site of rainfall-soil moisture-groundwater conversion in Dabie Mountain Area–Jianghan Plain is located in the northern region of the Jianghan Plain,the transition zone between the Dabie Mountain Area and Jianghan ***’s a great field test site to study the material and energy exchange among rainfall,soil moisture,and groundwater of the Earth’s critical zone in subtropical monsoon climate plain *** paper analyzed the connection between rainfall and volume water content(VWC)of soil at different depths of several soil profiles,and the dynamic feature of groundwater was discussed,which reveals the rainfall infiltration recharge of Quaternary Upper Pleistocene *** results show that the Quaternary Upper Pleistocene aquifer groundwater accepts a little direct rainfall recharge,while the lateral recharge is the main supplement *** were 75 effective rainfall events among 120 rainfall events during the monitoring period,with an accumulated amount of 672.9 mm,and the percentages of effective rainfall amount and duration time were 62.50%and 91.56%,*** max evaporation depth at the upper part in Quaternary cohesive soil was no less than 1.4 *** soil profile was divided into four zones:(1)The sensitive zone of rainfall infiltration within 1.4 m,where the material and energy exchange frequently near the interface between atmosphere and soil;(2)the buffer zone of rainfall infiltration between 1.4 m and 3.5 m;(3)the migration zone of rainfall infiltration between 3.5 m and 5.0 m;and(4)the rainfall infiltration and groundwater level co-influenced zone below 5.0 *** results revealed the reaction of soil moisture and groundwater to rainfall in the area covered by cohesive soil under humid climate in Earth’s critical zone,which is of great theoretical and practical significance for groundwater resources evaluation and development,groundwater environmental protection,ecological environmental improvement,drought disaster

关键词： Earth’s critical zone Rainfall-soil moisture-groundwater conversion Cohesive soil Scientific field test site Environmental geological survey engineering Jianghan Plain Hubei Province China

Gas Sources of Natural Gas Hydrates in the Shenhu Drilling Area, South China Sea: Geochemical Evidence and geological Analysis

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Acta Geologica Sinica(English Edition) 2013年第3期87卷 767-776页

作者： ZHU Youhai HUANG Xia FU Shaoying SU Pibo Oil & Gas Survey China Geological Survey Institute of Mineral Resources Chinese Academy of Geological Sciences Guangzhou Marine geological Survey

The Shenhu gas hydrate drilling area is located in the central Baiyun sag, Zhu I! depression, Pearl River Mouth basin, northern South China Sea. The gas compositions contained in the hydrate-bearing zones is dominated by methane with content up to 99.89% and 99.91%. The carbon isotope of the methane （δ^13C1） are -56.7%0. and -60.9%0, and its hydrogen isotope （δD） are -199%0 and -180%0, respectively, indicating the methane from the microbial reduction of CO2. Based on the data of measured seafloor temperature and geothermal gradient, the gas formed hydrate reservoirs are from depths 24-1699 m below the seafloor, and main gas-generation zone is present at the depth interval of 416-1165 m. Gas-bearing zones include the Hanjiang Formation, Yuehai Formation, Wanshan Formation and Quaternary sediments. We infer that the microbial gas migrated laterally or vertically along faults （especially interlayer faults）, slump structures, small-scale diapiric structures, regional sand beds and sedimentary boundaries to the hydrate stability zone, and formed natural gas hydrates in the upper Yuehai Formation and lower Wanshan Formation, probably with contribution of a little thermogenic gas from the deep sedments during this process.

关键词： natural gas hydrate methane microbial gas gas source migration South China Sea