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Genesis of the Wulong gold deposit,Liaoning Province,NE china:Constrains from noble gases,radiogenic and stable isotope studies

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Geoscience Frontiers 2020年第2期11卷 547-563页

作者： Peng Zhang Linlin Kou Yan Zhao Zhongwei Bi Deming Sha Renping Han Zhumin Li Shenyang geological survey center china geological survey

The Wulong lode deposit contains over 80 tonnes of gold with an average grade of 5.35 g/*** is one of the largest deposits in Dandong City,Liaoning Province in northeast *** studies on the deposit focused on its geological characteristics,geochemistry,fluid inclusions,and the timing of gold ***,controversy remains regarding the origin of the ore-forming fluids and metals,and the genesis of the gold *** paper presents zircon U-Pb and pyrite Rb-Sr ages and S,Pb,He,and Ar isotopic results along with quartz H and O isotopic data for all litho-units associated with the *** ablation inductively coupled mass spectrometry measurements yielded zircon U-Pb dates for samples of pre-mineralization rocks like granite porphyry dike,the Sanguliu granodiorite,fine-grained diorite,and syn-mineralization diorite,as well as post-mineralization dolerite,and lamprophyre;their emplacement ages are 126±1 Ma,124±1 Ma,123±1 Ma,120±1 Ma,119±2 Ma,and 115±2 Ma,*** pyrite Rb-Sr isochron age is 119±1 Ma,indicating that both magmatism and mineralization occurred during the Early *** δ18OH2 O values of ore-forming hydrothermal fluids from the quartz-polymetallic sulfide vein stage vary from 4.8‰to 6.5‰,and the δDv-SMOW values are between-67.7‰and-75.9‰,indicating that the ore-forming fluids were primarily *** noble gas isotope compositions of fluid inclusions hosted in pyrite suggest that the ore-forming fluids were dominantly derived from crustal sources with minor mantle *** isotopic values of pyrite vary between 0.2‰and 3.5‰,suggesting that S was derived from a homogeneous magmatic source or possibly from fluids derived from the *** Pb isotopic compositions of sulfides（207 Pb/204 Pb=15.51-15.71,206 Pb/204 Pb=17.35-18.75,208 Pb/204 Pb=38.27-40.03） indicate that the Pb of the Wulong gold deposit is a mixture of crust and mantle *** and geochemical data,together with the region

关键词： The Wulong gold deposit Zircon U-Pb Pyrite Rb-Sr H-He-O-Ar-S-Pb isotopes Liaodong Peninsula

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Origin of the Newly Discovered Zhunuo Porphyry Cu-Mo-Au Deposit in the Western Part of the Gangdese Porphyry Copper Belt in the Southern Tibetan Plateau,SW china

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 109-134页

作者： HUANG Yong LI Guangming DING Jun DAI Jie YAN Guoqiang DONG Suiliang HUANG Hanxiao Chengdu center China Geological Survey Tianjin center China Geological Survey

The newly discovered Zhunuo porphyry Cu-Mo-Au deposit is located in the western part of the Gangdese porphyry copper belt in southern Tibet, SW china. The granitoid plutons in the Zhunuo region are composed of quartz diorite porphyry, diorite porphyry, granodiorite porphyry, biotite monzogranite and quartz porphyry. The quartz diorite porphyry yielded zircon U-Pb ages of 51.9±0.7 Ma（Eocene） using LA-ICP-MS, whereas the diorite porphyry, granodiorite porphyry, biotite monzogranite and quartz porphyry yielded ages ranging from 16.2±0.2 to 14.0±0.2 Ma（Miocene）. CuMo-Au mineralization is mainly hosted in the Miocene granodiorite porphyry. Samples from all granitoid plutons have geochemical compositions consistent with high-K calc-alkaline series magmatism. The samples display highly fractionated light rare-earth element（REE） distributions and heavy REE distributions with weakly negative Eu anomalies on chondrite-normalized REE patterns. The trace element distributions exhibit positive anomalies for large-ion lithophile elements（Rb, K, U, Th and Pb） and negative anomalies for high-field-strength elements（Nb and Ti） relative to primitive mantlenormalized values. The Eocene quartz diorite porphyry yielded εNd（t） values ranging from-3.6 to-5.2,（-（87）Sr/-（86）Sr）i values in the range 0.7046–0.7063 and initial radiogenic Pb isotopic compositions with ranges of 18.599–18.657 -（206）Pb/-（204）Pb, 15.642–15.673 -（207）Pb/-（204）Pb and 38.956–39.199 -（208）Pb/-（204）Pb. In contrast, the Miocene granitoid plutons yielded ε（Nd）（t） values ranging from-6.1 to-7.3 and（87Sr/86Sr）i values in the range 0.7071–0.7078 with similar Pb isotopic compositions to the Eocene quart diorite. The Sr-Nd-Pb isotopic compositions of the rocks are consistent with formation from magma containing a component of remelted ancient crust. Zircon grains from the Eocene quartz diorite have ε（Hf）（t） values ranging from-5.2 to ＋0.9 and two-stage Hf model ages ranging from 1.07 to 1.46 Ga, while zircon grains from the M

关键词： Zircon U-Pb dating Sr-Nd-Pb-Hf isotope Zhunuo porphyry Cu-Mo-Au deposit Gangdese porphyry copper belt

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Genesis of the Maoling gold deposit in the Liaodong Peninsula:Constraints from a combined fluid inclusion,C-H-O-S-Pb-He-Ar isotopic and geochronological studies

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Geoscience Frontiers 2022年第4期13卷 11-33页

作者： Peng Zhang Linlin Kou Yan Zhao Deming Sha Shenyang geological survey center China Geological SurveyShenyang 110034China

The large tonnage Maoling gold deposit(25 t@3.2 g/t)is located in the southwest Liaodong Peninsula,North china *** deposit is hosted in the Paleoproterozoic metamorphic *** stages of mineralization were identified in the deposit:(stageⅠ)quartz-arsenopyrite±pyrite,(stageⅡ)quartz-goldarsenopyrite-pyrrhotite,(stageⅢ)quartz-gold-polymetallic sulfide,and(stageⅣ)*** this paper,we present fluid inclusion,C-H-O-S-Pb-He-Ar isotope data,zircon U-Pb,and gold-bearing sulfide(*** and pyrrhotite)Rb-Sr age of the Maoling gold deposit to constrain its genesis and ore-forming *** types of fluid inclusions were distinguished in quartzbearing veins,including liquid-rich two-phase(WL type),gas-rich two-phase(GL type),and daughter mineral-bearing fluid inclusions(S type).Fluid inclusions data show that the homogenization at temperatures 197 to 372°C for stageⅠ,126 to 319°C for stageⅡ,119 to 189°C for stageⅢ,and 115 to 183°C for stageⅣ,with corresponding salinities of 3.7 to 22.6 wt.%,4.7 to 23.2 wt.%,5.3 to 23.2 wt.%,and 1.7 to14.9 wt.%Na Cl equiv.,*** boiling was the critical factor controlling the gold and associated sulfide precipitation at *** and oxygen stable isotopic analyses for quartz yielded δ^(18)O=-5.0‰ to 9.8‰ and δD=-133.5‰ to-77.0‰.Carbon stable isotopic analyses for calcite and ankerite yielded δ^(13)C=-2.3‰to-1.2‰ and O=7.9‰ to 14.1‰.The C-H-O isotope data show that the oreforming fluids were originated from magmatic water with meteoric water input during *** inclusions in arsenopyrite have ^(3)He/^(4)He ratios of 0.002 Ra to 0.054 Ra,and ^(40)Ar/^(36)Ar rations of 1225 to 3930,indicating that the ore-forming fluids were dominantly derived from crustal sources almost no mantle *** isotopic values of Maoling fine-grained granite range from6.‰1 to 9.8‰,with a mean of 7.7‰,δ^(34)S values of arsenopyrite from the mineralized phyllite(host rock)range fr

关键词： Geochronology Fluid inclusions Isotope geochemistry Maoling gold deposit Liaodong Peninsula

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In Situ Analyses of Trace Elements, U–Pb and Lu–Hf Isotopes in Zircons from the Tongshankou Granodiorite Porphyry in Southeast Hubei Province, Middle-Lower Yangtze River Metallogenic Belt, china

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1588-1600页

作者： XIA Jinlong HUANG Guicheng DING Lixue CHENG Shunbo Wuhan center China Geological Survey Research center of Granitaic Diagenesis and Mineralization China Geological Survey

The Tongshankou Cu-Mo deposit, located in southeast Hubei province, is a typical skarn–porphyry type ore deposit closely related to the Tongshankou granodiorite porphyry, characterized by a high Sr/Y *** in situ analyses of the trace elements and U–Pb and Lu–Hf isotopes in zircons from the Tongshankou granodiorite porphyry were *** any inherited zircons were observed, and the analyzed zircons yielded highly concordant results with a weighted mean 206Pb/238 U age of 143.5 ± 0.45 Ma（n=20, mean square weighted deviation was 0.75）, which was interpreted to represent the crystallization age of the Tongshankou granodiorite *** chondrite-normalized rare-earth element pattern was characterized by a slope that steeply rises from the light-group rare-earth elements（LREE） to the heavy-group rare-earth elements（HREE） with a positive Ce-anomaly and inconspicuous Eu-anomaly, which was coincident with the pattern of the zircons from the Chuquicamata West porphyry, *** analyzed zircons also had relatively low 176Hf/177 Hf ratios of 0.282526–*** t=143 Ma, the corresponding calculated initial Hf isotope compositions（εHf（t）） ranged from-5.6 *** results of the in situ analysis of trace elements and U–Pb and Lu–Hf isotopes in zircons from the Tongshankou granodiorite porphyry suggest that a deep-seated process involving a thickened-crust/enriched-mantle interaction may play an important role in the generation of high Sr/Y-ratio magma and potentially in the generation of porphyry Cu-Mo systems.

关键词： trace element zircon Hf isotope granodiorite porphyry Middle-Lower Yangtze River metallogenic belt

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Geochronology and Petrochemistry of Volcanic Rocks in the Xaignabouli Area, NW Laos

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Journal of Earth Science 2019年第1期30卷 37-51页

作者： Meifeng Shi Zhenbo Wu Shusheng Liu Zhimin Peng Linnan Guo Fei Nie Siwei Xu Chengdu center China Geological Survey

An integrated study of zircon U-Pb geochronology and petrochemistry, together with zircon Lu-Hf isotopes, has been carried out on the basaltic-andesitic tuff and volcanic breccia from the Nam Hang Formation and andesitic tuff from the Muang-Nan Formation in the Xaignabouli area, which had been mapped as the Permian–Early Triassic on the 1 : 1 000 000 geological map or Late Carboniferous on the 1 : 200 000 geological maps. Zircon U-Pb dating of three samples yielded weighted mean ages of 235±2.6, 232±1.4 and 278±2.8 Ma, respectively, suggesting a Late Triassic origin for the Nam Hang Formation and an Early Permian origin for the Muang-Nan Formation. Geochemically, they are characterized by depletions in HFSEs(e.g., Nb, Ta, Ti) and high LILE/HFSE ratios, and they have positive zircon ε_(Hf)(t) values of 8.7–15.9, which exhibits the continental arc volcanic affinity and partial melting of subducting oceanic slab in the magma source. Combined with spatial occurrence of the volcanic rock and existing geochronological and geochemical data, we suggest that the Xaignabouli-Luang Prabang volcanic belt can be linked to the Loei-Phetchabun belt. The Permian–Triassic volcanic rocks in this belt might be a product of the Nan back-arc basin eastward subduction.

关键词： volcanic rock zircon U-Pb geochronology geochemistry zircon Lu-Hf isotope Xaignabouli Laos

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Potential and Suitability Evaluation of CO_2 geological Storage in Major Sedimentary Basins of china,and the Demonstration Project in Ordos Basin

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Acta Geologica Sinica(English Edition) 2015年第4期89卷 1319-1332页

作者： GUO Jianqiang WEN Dongguang ZHANG Senqi XU Tianfu LI Xufeng DIAO Yujie JIA Xiaofeng center for Hydrogeology and Environmental Geology survey China Geological Survey china geological survey College of Environmental and Resources Jilin University

From 2010 to 2012, the china geological survey center for Hydrogeology and Environmental Geology survey （CHEGS） carried out the project ＂Potential evaluation and demonstration project of CO2 geological Storage in china＂. During this project, we developed an evaluation index system and technical methods for the potential and suitability of CO2 geological storage based on china＇s geological conditions, and evaluated the potential and suitability of the primary basins for COz geological storage, in order to draw a series of regional scale maps （at a scale of 1：5000000） and develop an atlas of the main sedimentary basins in china. By using these tools, we delineated many potential targets for CO2 storage. We also built techniques and methods for site selection and the exploration and assessment of CO2 geological storage in deep saline aquifers. Furthermore, through cooperation with the china Shenhua Coal to Liquid and Chemical Co., Ltd., we successfully constructed the first coal-based demonstration project for CO2 geological storage in deep saline aquifers in the Yijinhuoluo Banner of Ordos in the Inner Mongolia Autonomous Region, which brought about the basic preliminary theories, techniques, and methods of geological CO2 storage in deep saline aquifers under china＇s geological conditions.

关键词： C02 geological storage potential and suitability evaluation atlas demonstration project

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Taxonomy,Zonation and Correlation of the Graptolite Fauna across the Lower/Middle Ordovician Boundary Interval in the Yangtze Gorges Area,South china

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 32-47,44-47+43页

作者： WANG Chuanshang WANG Xiaofeng CHEN Xiaohong LI Zhihong Wuhan center of china geological survey

The graptolite fauna across the Lower and Middle Ordovician boundary at the Huanghuachang GSSP section, Yichang and the Jianyangping section, Xingshan County is described. The taxonomy of the pendent didymograptids, the graptolite zonations across the base of Middle Ordovician and their correlations are discussed in this paper. The two revised graptolite zones, the Didymograptellus bifidus Zone and the Azygograptus suecicus Zone, can be well correlated to their equivalents elsewhere in the world.

关键词： graptolite Huanghuachang section Middle Ordovician

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Mesozoic–Cenozoic Volcanic Cycle and Volcanic Reservoirs in East china

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Journal of Earth Science 2021年第4期32卷 742-765页

作者： Guangfu Xing Jianqing Li Zheng Duan Mingxuan Cao Minggang Yu Pingli Chu Rong Chen Wuhan center of china geological survey Wuhan 430205China Nanjing center of china geological survey Nanjing 210016China

There are widespread Mesozoic–Cenozoic terrestrial volcanic activities in East china,and they produced favorable geologic factors for the volcanic *** reveal the spatio-temporal evolution of regional volcanisms and their tectonic setting,we subdivide Mesozoic–Cenozoic volcanic activities into 6 volcanic cycles(Ⅰ–Ⅵ),and summarize the temporal-spatial distribution,rock association and tectonic setting of each *** Cycle I forms a post-orogenic intraplate bimodal volcanic *** cyclesⅡandⅢinclude arc volcanic associations formed in compressional and extensional subduction environments,*** CycleⅣcontains a post-orogenic arc bimodal *** CycleⅤis a basaltic association of tholeiite series under initial rift setting,and the CycleⅥis basaltic association of alkaline series under typical rift *** volcanic strata between each cycle are bounded by regional *** above 6 volcanic cycles correspond to 6 sequential stages of tectonic evolutions from the Early Jurassic post-orogeny,the Mid-Jurassic–Cretaceous subduction of the paleo-Pacific Plate to the Cenozoic marginal *** to the geological characteristics of volcanic reservoirs in different volcanic cycles,it is put forward that the CycleⅤis the major formation period of volcanic reservoirs in East china and should be the focus of exploration,and that the volcanic reservoirs of the CycleⅣare also worthy of attention.

关键词： volcanic reservoir tectonic evolution volcanic cycle Mesozoic-Cenozoic East china

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Mesozoic–Cenozoic Tectonic Evolution and Uplift in Pamir:Application of Fission Track Thermochronology

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 780-793页

作者： FAN Baocheng LIU Mingyi HE Zixin MENG Guanglu WU Huanhuan LI Lu Xi'an center of Mineral Resources survey China Geological SurveyXi’an 710054China Xi'an center China Geological SurveyXi’an 710054China china geological Library Beijing 102249China

The Pamir Plateau can be divided into three secondary tectonic units from north to south:the North,the Middle and the South Pamir *** North Pamir Block belonged to the southern margin of Tarim-Karakum,thermochronological study of the Pamir structural intersection indicates that accretion of the Middle Pamir Block to the Eurasian Continental Margin and its subduction and collision with the North Pamir Block occurred in the Middle–Late *** to the Neo-Tethys closure in the Early Cretaceous,the South Pamir Block began to collide with the accretion(the Middle Pamir Block)of the Eurasian Continental *** by the collision and continuous convergence between the Indian Plate and the Eurasian Plate since the Cenozoic,Pamir is in a multi-stage differential uplift *** 56.1–48.5 Ma,North Pamir took the lead in uplifting,that is,the first rapid uplift in the Pamir region began *** continuous compression and contraction of the Indian and Eurasian plates during 22.0–15.1 Ma forced the Pamir tectonic syntaxis to begin its overall uplift,*** began to enter the second rapid uplift stage in the Early Oligocene,which lasted until the Middle *** 14.6–8.5Ma,South Pamir was in a rapid uplift stage,while North Pamir was in a relatively stable state,showing asymmetry of tectonic deformation in the Pamir region in *** 6.5 Ma,Pamir began to rapidly uplift again.

关键词： fission track thermal history tectonic evolution Pamir

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New Discovery and Zircon Hf Isotopic Composition of the Early Yanshannian Monzogranite in the Yingyangguan Group of Eastern Guangxi, china

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Acta Geologica Sinica(English Edition) 2018年第4期92卷 1653-1655页

作者： LI Xiang TU Bing WANG Lingzhan TIAN Yang XIE Guogang ZHANG Jianyu Wuhan center of geological survey China Geological Survey Research center of Granitic Diagenesis and Mineralization China Geological Survey School of Earth Sciences China University of Geosciences

Objective The Yingyangguan Group is widely exposed in the southwestern segment of boundary belt between Yangtze and Cathaysian blocks and is mainly composed of a suit of lower-grade metamorphic marine volcanoclastic- sedimentary rocks （Zhou Hanwen et al., 2002）. Its forming age and petrogenesis are critical for better understanding the orogenic process and relationship of the Yangtze and Cathaysian blocks since the Neoproterozoic. However, few zircon U-Pb ages of samples from the Yingyangguan Group have been reported, which are much debated, such as the metamorphic spilite （819±11 Ma）, keratophyre （415.1±2.1 Ma） and ignimbrite （821.3±3.9 Ma）（Tian Yang et al., 2015 and references in）. In this study, we focus on the new discovered Early Yanshannian monzogranite and its mafic enclaves from the Yingyangguan Group, and conducted zircon U-Pb dating and in-situ Hf isotopic analyses to constrain their petrogenesis.

关键词： Hf ICP MS Pb New Discovery and Zircon Hf Isotopic Composition of the Early Yanshannian Monzogranite in the Yingyangguan Group of Eastern Guangxi china

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