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Minerogenetic mechanism of Rushan gold deposit, Shandong Province——Evidence of ore-forming fluid and H, O, Sr isotopes

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Chinese Science Bulletin 1997年第3期42卷 240-243页

作者： Zhai, JP Hu, K Lu, JJ Department of Earth Sciences Nanjing University Nanjing 210093 China

THE Rushan gold deposit, being of quartz-vein type, is located in biotite monzonitic granite of Kunyushan complex pluton in eastern Shandong, China, and the orebody No. 2 is the largest mono-vein deposits found in China. The gold mineralization can be divided into three stages according to crisscross relations of the various microlodes in the deposit: Ⅰ. pre-ore stage of comb-structured milky-white quartz veins; Ⅱ. main mineralization stage of multi-metal sulphides and siderite-quartz veins; Ⅲ. post-ore stage of mottled cryptocrystalline quartz veins.

关键词： granite quartz-vein type gold deposit ore-forming fluid origin of deposit.

ore-forming mechanism for the Xiaoxinancha Au-rich Cu deposit in Yanbian,Jilin Province,China:Evidence from noble gas isotope geochemistry of fluid inclusions in minerals

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Science China Earth Sciences 2008年第2期51卷 216-228页

作者： KEISUKE Nagao HIROCHIKA Sumino Laboratory for Earthquake Chemistry Graduate School of Science The University of Tokyo Tokyo 7-3-1 Japan

The Xiaoxinancha Au-rich copper deposit is one of important Au-Cu deposits along the continental margin in Eastern China. The deposit consists of two sections: the Beishan mine (North), composed of altered rocks with veinlet-dissemination sulfides and melnicovite-dominated sulfide-quartz veins, and the Nanshan mine (South), composed of pyrrhotite-dominated sulfide-quartz veins and pure sulfide veins. The isotope compositions of noble gases extracted from fluid inclusions in ore minerals, i.e. ratios of 3He/4He, 20Ne/22Ne and40Ar/36Ar are in the ranges of 4.45―0.08 Ra, 10.2―8.8 and 306―430, respectively. Fluid inclusions in minerals from the Nanshan mine have higher 3He/4He and 20Ne/22Ne ratios whereas those from the Beishan mine have lower 3He/4He ratios. The analysis of origin, and evolution of the ore fluids and its relations with the ore-forming stages and the ages of mineralization suggests that the initial hydrothermal fluids probably come from the melts generated by partial melting of oceanic crust with the participation of fluids from the mantle (mantle-plume type)/aesthenosphere. This also corresponds to the continental margin settings during the subduction of Izanagi ocaneic plate towards the palaeo-Asian continent (123―102 Ma). The veinlet-dissemination ore bodies of the Beishan mine were formed through replacement and crystallization of the mixed fluids generated by mixing of the ascending high-temperature boiling fluid with young crustal fluid whereas the melnicovite-dominated sulfide-quartz veins were formed subsequently by filling of the high-temperature ore fluid in fissures. Pyrrhotite-dominated sulfide-quartz veins in the Nanshan mine were formed by filling-deposition-crystallization of the moderate-temperature ore fluids and the pure sulfide veins were formed later by filling-deposition-crystallization of ore substance-rich fluids after boiling of the moderate-temperature ore fluids. The metallogenic dynamic processes can be summarized as: (1) formation of fluidand ore substance-bearing Adakitic

关键词： Au-rich Cu deposit fluid inclusion He-Ne-Ar isotopes ore-forming mechanism Xiaoxinancha Yanbian

ore-forming information of quartz vein-type gold deposits——Taking Bainaimiao gold deposit

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Science China Chemistry 1995年第4期38卷 495-503页

作者：孟良义朱泰天周立宏 Department of Geology Changchun College of Earth Sciences Changchun 130026 China Changchun Institute of Gold Changchun 130012 China Institute of Geology Dagang Oilfield Tianjin 300270 China

As an example, the ore-forming information of the Bainaimiao quartz vein-type gold deposits is dealt with. The second stage of gold mineralization (stage II) is an important ore-forming process; the intersected parts of main structure with other structures provide the favorable mineralization information; when the same form of pyrite crystals in one sample has two groups of thermoelectronic voltage, i. e. one group being positive and another group being negative and when the strong and relatively strong anomalies of Hg, F and/or As, Sb are overlapped by the weak anomalies of Au and Ag, the probable existence of blind orebodies at the depth could be predicted.

关键词： gold deposit ore-forming information blind orebody.

Geothermal and fluid flowing simulation of ore-forming antimony deposits in Xikuangshan

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Science China Earth Sciences 2006年第8期49卷 862-871页

作者： YANG Ruiyan1,2, MA Dongsheng2, BAO Zhengyu3, PAN Jiayong2, CAO Shuanglin2 & XIA Fei2 1. School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China 2. State Key Laboratory for Research of Mineral Deposits, Nanjing University, Nanjing 210093, China 3. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China School of Mathematics and Physics China University of Geosciences Wuhan China State Key Laboratory for Research of Mineral Deposits Nanjing University Nanjing 210093 China Faculty of Earth Sciences China University of Geosciences Wuhan China

The Xikuangshan Antimony Deposit located in the Mid-Hunan Basin, China, is the larg- est antimony deposit in the world. Based on the hydrogeological and geochemical data collected from four sections, Xikuangshan-Dajienao (AO), Xikuangshan-Dashengshan (BO), Xikuang- shan-Longshan (CO) and Dafengshan (DO) in the Basin, an advanced metallogenic model related to deep-cyclic meteoric water of Xikuangshan Antimony Deposit is put forward in this paper using a model of heat-gravity-driving fluid flow transportation. The simulation results show that the ore-forming fluid of the deposit mainly comes from the Dashengshan and Longshan areas where BO and CO sections are located if the overall basin keeps a constant atmospheric precipitation and infiltration rate during mineralization, and that the average transportation speed of the ore-forming fluids is about 0.2―0.4 m/a.

关键词： ore-forming fluid, numerical simulation, geothermal field, geofluid transport, Xikuangshan, antimony deposits.

Discriminating characters of ore-forming intrusions in the super-large Chalukou porphyry Mo deposit,NE China

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Geoscience Frontiers 2018年第5期9卷 1417-1431页

作者： Peixin Duan Cui Liu Xuanxue Mo Jinfu Deng Jinhua Qin Yu Zhang Shipan Tian School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Heilongjiang Institute of Geological Survey Harbin 150036China Heilongjiang Province Institute of Regional Geology Survey Harbin 150080China

The Chalukou porphyry Mo deposit, located in the Great Hinggan Range, is the largest Mo deposit in northeast China, although the age and genesis of the associated magmatic intrusions remain debated.Here we report zircon U-Pb ages and trace elements, whole rock geochemistry and Sre Nd isotope data with a view to understand the relationship between the magmatism and molybdenum mineralization.Zircon U-Pb analysis yield an age of 475 Ma for rhyolite in the older strata, 168 Ma for the premineralization monzogranite, and 154 Ma for the syn-mineralization granite porphyry. The granite porphyry and quartz porphyry are considered as the ore-forming intrusions. These rocks are peraluminous, alkali-calcic, and belong to high-K to shoshonitic series with a strong depletion of Eu. They also display characteristics of I-type granites. The rocks exhibit wide variations of(87 Sr/86 Sr)iin the range of 0.705426 -0.707363, and ε_(Nd)(t) of -3.7 to 0.93. Zircon REE distribution patterns show characteristics between crust and the mantle, implying magma genesis through crust-mantle interaction. The Fe_2O_3/FeO values(average 1) for the whole rock and EuN/Eu*Nvalues(average 0.45), Ce^(4+)/Ce^(3+) values(average 301)for zircon grains from the granite porphyry are higher than those from other lithologies. These features suggest that the ore-forming intrusions(syn-mineralization porphyry) had higher oxygen fugacity conditions than those of the pre-mineralization and post-mineralization rocks. The Chalukou Mo deposit formed in relation to the southward subduction of the Mongol-Okhotsk Ocean. Our study suggests that the subduction-related setting, crust-mantle interaction, and the large-scale magmatic intrusion were favorable factors to generate the super-large Mo deposits in this area.

关键词： Greater Hinggan Range Chalukou porphyry Mo deposit Geochronology ore-forming intrusions Mongolia-Okhotsk ocean

ore-forming fluid and mineralization of Caijiaying and Dajing polymetallic ore deposits

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Science China Earth Sciences 2004年第2期47卷 97-107页

作者： WANG Lijuan,WANG Jingbin, WANG Yuwang & ZHU Heping1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China Correspondence should be addressed to Wang Lijuan (email: wlj@***) Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China Beijing Institute of Geology for Mineral Resources Beijing China

Fluid inclusions from the Dajing and Caijiaying deposits have nearly the same homogenization temperature. Correlation between temperature and salinity shows that both Sn- and Cu-bearing fluids Sn and Cu were present in the Dajing deposit but only one kind of fluids continuously evolved in the Caijiaying deposit. Study on rare earth elements (REE) in ancient fluid from the inclusions indicates that the fluid of Sn mineralizing stage in Dajing was derived from remelting magma of the continental crust, and the fluid of Cu-Pb-Zn mineralizing stage in the Dajing deposit and the fluid of Cu-Pb-Zn mineralization in the Caijiaying deposit were derived from the mantle. It is concluded that the Cu-Pb-Zn mineralizations in the Dajing and Caijiaying deposits resulted from the identical tectono-thermal event of magma-fluids induced by Mesozoic tectonic transition and extension in the eastern part of North China Craton.

关键词： Caijiaying, Dajing, Mesozoic tectonic transition, ore-forming fluid, REE.

Source of the ore-forming Adakitic Porphyry at the Beiya Super-large Au Deposit, Western Yangtze Craton: New Evidence from Zircon U-Pb Ages of the Amphibolite Xenoliths

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 208-209页

作者： LIU Siqi ZHENG Yuanchuan SHEN Yang HOU Zengqian WANG Lu WANG Zixuan State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

Objective The Beiya super-large Au-rich porphyry deposit(304 t Au,2.4 g/t Au)is located within the western Yangtze craton,to the southeast of the Sanjiang Tethyan Orogen(Fig.1).The ore-forming porphyry is adakitic,characterized by high Sr/Y and La/Yb ratios coupled with low Y and Yb contents,and is generally thought to be derived from partial melting of thickened mafic lower crust.The lower crust underneath the western Yangtze craton is mainly composed of ancient crust with Archean ages,juvenile crust resulting from the Neoproterozoic subduction(740–1000 Ma),and late Permian juvenile crust related to the Emeishan mantle plume.Which lower crustal end-member has played a critical role in genesis of the Beiya ore-forming porphyry can be constrained by zircon U-Pb ages of amphibolite xenoliths hosted in the ore-forming porphyry,because these xenoliths represent direct samples of the source.In this study,we present new zircon U-Pb ages of these amphibolite xenoliths to have insight into the nature of the Beiya adakitic porphyry source.

关键词： Western Yangtze Craton New Evidence from Zircon U-Pb Ages of the Amphibolite Xenoliths Source of the ore-forming Adakitic Porphyry at the Beiya Super-large Au Deposit

ON ore SOURCE AND ore-forming FLUID OF DONGCHUAN-YIMEN TYPE COPPER DEPOSITS

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Science China Chemistry 1989年第9期32卷 1117-1124页

作者：冉崇英 Department of Geology Kunming Institute of Technology

The macroscopic and microscopic studies (in mineral inclusions, stable isotopes, traceelements, etc.) on the Donchuan-Yimen type copper deposits show that the ore material deriv-ed from host rocks and their underlying beds, and Bi, Pb, Zn probably did from deep frac-tures. The ore-forming fluid is hot brine in nature, and the water in it is probably stratumwater in origin. The sulphur derived from bacteria reducing of sulphate in sea water. Thecarbon derived from marine carbonate. The organic carbon plays an important role in themetallogenesis. In the Kangdian Axis, two deep fractures controlled the sedimentation of thecupriferous algal reef carbonate formation. They were ore-, heat-, brine-conducting tectonicsand led to the formation and transformation of many copper ore beds.

关键词： ore source ore-forming fluid sedimentary-diagenetic-transformed deposits

Light hydrocarbon in ore-forming fluids and its constraints on ore genesis——A case study on Changkeng large-scale Au-Ag deposit, central Guangdong, China

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Chinese Science Bulletin 1999年第S2期44卷 58-61页

作者： D. l. Norman Department of Earth & Environmental Sciences New Mexico Institute of Mining & Technology (NMT) Socorro NM87801 USA

ORGANIC matters in the ore-forming fluids are composed mainly of light hydrocarbons. Because of the small amount of hydrocarbons in fluid inclusions, it is quite difficult to study their behavior in mineralizing processes, excepting methane （CH4）. In this work, we used a high vacuum quadrupole gas massspectrometer system to determine the content and composition of light hydrocarbons (C1-7) in fluid inclusions in minerals collected from Changkeng Au-Ag deposit. The geological significance of the new data forgenesis of the deposit has been discussed briefly.

关键词： light hydrocarbons ore-forming fluid ore genesis Changkeng Au-Ag deposit.