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

Science china Earth sciences 2004年第2期47卷 97-107页

作者： wang lijuan,wang jingbin,{2., {3. of geology and Geophysics, chinese Academy of sciences, beijing 10002., china 2. beijing {3. of geology for {12. resources, beijing 100012. china Correspondence should be addressed to wang lijuan (email: wlj@***) 1. key laboratory of {2. {3. Institute of Geology and Geophysics Chinese Academy of Sciences 100029 Beijing China 2. beijing institute of {2. for mineral resources 100012 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.

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A Preliminary Study on Fluid Inclusions and mineralization of Xitieshan Sedimentary-Exhalative (SEDEX) Lead-Zinc Deposit

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Acta Geologica Sinica(English Edition) 2008年第4期82卷 838-844页

作者： wang lijuan zhu Xinyou {2. DENG Jiniu {3. yuwang zhu heping beijing institute of {2. for {3. resources Beijing 100012 China key laboratory of {2. {3. Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Western Mining Corporation Ltd. Xining 830001 China

The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, china, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming fluids shows that fluid inclusions in quartz from altered stockwork rocks that represent the pipe facies have a wide range of temperature and salinity. The intense fluid activities are characteristics of the pipe facies of the exhalative system. Fluid inclusions in carbonates near the unstratified ore bodies hosted in the thick-bedded marble which represents vent-proximal facies are large in size and have moderate to high temperatures. They represent unerupted sub-seafloor fluid activity. Fluids in altered stockwork rocks and carbonates have similar H2.-NaCI-CO2.system, both belonging to the sedimentary-exhalative system. The fluids migrate from the pipe facies to the unstratified ore bodies. Boiling of the fluids causes the separation of CO2.vapor and liquid H2.. When the fluids migrate into the unconsolidated thick-bedded marble, the escape of CO2. decreasing temperature and pressure as well as some involvement of seawater into the fluids result in the unmixing of fluids with high and low salinity and deposition of ore-forming materials. The two unmixed fluids were trapped in unconsolidated carbonates and the ore-forming materials were deposited in the unconsolidated carbonates to form the sedimentary-exhalative type unstratified ore bodies. The oreforming temperature of unstratified ore bodies is up to high temperature indicating that there is a huge ore-forming potential in its deep.

关键词： sedimentary-exhalative system pipe facies unstratified ore bodies fluid inclusions the Xitieshan lead-zinc deposit

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

Ore-forming fluid and mineralization of Caijiaying and Dajin...

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中国科学院地质与地球物理研究所2.04学术年会

作者： wang lijuan~(1,2.,wang jingbin~(1,2.,{2. yuwang~(1,2. & zhu heping~1 1.key laboratory of mineral resources,{13. of geology and Geophysics,{12. Academy of sciences,beijing 10002.,china 2.beijing {13. of geology for mineral resources,beijing 100012.china

Fluid inclusions from the Dajing and Caijiaying deposits have nearly the same homogenization *** between temperature and salinity shows that both Snand Cu-bearing fluids Sn and Cu were present in the Dajing deposit but only one kind of fluids continuously evolved in the Caijiaying *** 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 *** 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

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The fluid mineralization characteristics of gold deposits in Jungger-East Tianshan mountains area,Xingjiang

The fluid mineralization characteristics of gold deposits in...

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First Meeting Asia Current Research on Fluid Inclusion

作者： lijuan wang, jingbin wang, yuwang wang, heping zhu, Lili Qu beijing institute of geology for mineral resources, beijing 100012, china key laboratory of mineral resources, institute of geology and Geophysics, chinese Academy of sciences,{23., china

The Junggar-eastern Tianshan area of Xinjiang Automous Region is situated at the northwestern part of china. Collisional orogeny in the area took place in the Carboniferous-Permian and underwent a history of contraction and subsequent extension. The gold, copper and nickel mineralization in the area also took place in the Carboniferous-Permian. Therefore, gold mineralization in the area coincides with the collisional orogeny in timing, distribution and geodynamic setting.

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Ultramafic xenoliths in Mesozoic diorite in west Shandong Province

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Science china Earth sciences 2004年第6期47卷 489-499页

作者： CHEN Lihui1,2.& ZHOU Xinhua2.1.The key {3. of Orogenic Belts and Crustal Evolution,Ministry of Education,{2. and School of Earth and Space sciences,Peking University,beijing 100871,{2. 2.institute of geology and Geophysics,chinese Academy of sciences,beijing 10002.,{2. Correspondence should be addressed to Chen Lihui(email: lihui_chen@***) 1. The key laboratory of Orogenic Belts and Crustal Evolution Ministry of Education China and School of Earth and Space Science Peking University 100871 Beijing China 2. institute of geology and Geophysics Chinese Academy of Sciences 100029 Beijing China

Ultramafic xenoliths are common in Tietonggou intrusion, Laiwu, Shandong Prov-ince. Peridotite xenoliths develop two-stage metasomatism popularly: (i) The early metasoma-tism is characterized by intergranular clinopyroxene and phlogopite; (ii) The later metasomatism is characterized by orthopyroxene veins with a few plagioclases and amphiboles. These ul-tramafic xenoliths are thought to be mostly from the crust-mantle transitional zone on the basis of their combination, mineral chemistry, equilibrium temperature, and metasomatic characteristics. Major elements, rare earth elements, and Sr-Nd isotopic composition of the ultramafic xenoliths indicate that there is a petrogenetic relationship between the silica-enriched xenoliths and their host diorites. We propose that such silica enrichment might be an indicator of melt-rock interac-tions in the Mesozoic lithosphere beneath western Shandong.

关键词： ultramafic xenoliths, crust-mantle transitional zone,metasomatism, Tietonggou intrusion, Laiwu.

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Prediction of Hidden Ore Bodies using Integrated geology,Source of Fluids and Stratagem EH4 Geophysical Survey in Kuoerzhenkuola Gold Deposit in Xinjiang,china

Prediction of Hidden Ore Bodies using Integrated Geology,Sou...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Ping SHEN,Yuanchao SHEN,Tiebing LIU,heping zhu,{2. {3., Qingdong ZENG and Guangming LI key laboratory of mineral resources,institute of geology and Geophysics,chinese Academy of sciences,{12.,{13.

The Kuoerzhenkuola gold deposit is located in the Sawur gold belt in Xinjiang,*** integrated geological, geochemical and geophysical investigation was carried out in the Kuoerzhenkuola gold deposit,to determine the extension of the principal mineralized system,in the search for new ***-examination of the rocks and structures in the Kuoerzhenkuola area showed that the study area features an elliptical caldera where the gold deposit lies.A re-investigation of the mine geology found that the mineralization at the Kuoerzhenkuola gold deposit is not controlled by the EW-striking regional fault as previously assumed,but by a caldera fracture system locally superimposed by regional faults;the host rocks are andesites and dacites of the Carboniferous Heishantou Group rather than the crypto-explosive breccia of the Devonian Sawurshan *** components of fluid inclusions from quartz,trace element chemistry of pyrite and fluid inclusions in pyrite,Pb isotopes of pyrite,and whole-rock geochemistry and Pb isotopes of the country rocks are used to study the source of fluids at Kuoerzhenkuola gold *** ore-forming fluids are characterized by low-moderate temperatures and low salinities estimated from fluid inclusion *** mass spectrometry indicated a CO-bearing *** coupled plasma-mass spectrometry of the fluid inclusions indicated high Cu (average 70 ppm) for the Au mineralization,whereas the host rocks have low Cu(average 3. ppm),indicating that Cu of the ore-forming fluids originated from magmatic fluid rather than the volcanic *** isotopes of ores and host volcanic rocks indicate a similar,mixed source and some Pb could be sourced from the *** implied that magmatic fluids could play an important role in the Au mineralization *** new geological findings and the fluids derived mainly from the magmatic fluids suggest that the ore-forming fluids originate at depth,and are transported and precipi

关键词： gold mineralization prediction of hidden ore bodies source of fluids Stratagem EH4 Xinjiang.

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Methane-rich fluid evolution of the Baogutu porphyry Cu-Mo-Au deposit,Xinjiang,NW china

Methane-rich fluid evolution of the Baogutu porphyry Cu-Mo-A...

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中国科学院地质与地球物理研究所第十届(2.10年度)学术年会

作者： Ping Shen~(a,*),Yuanchao Shen~a,jingbin wang~(a,b),{2. {3.~a,lijuan wang~(a,b),Lei Meng~(a,b) a key laboratory of mineral resources,institute of geology & Geophysics,{12. Academy of {13.,P.O.Box 982.,beijing 10002.,china b china Non-ferrous Metals Resource Geological Survey,beijing 100012.china

Baogutu is the first porphyry Cu-Mo-Au deposit discovered in Western Junggar,Xinjiang,NW *** ore-bearing intrusion is a dioritic intrusive complex that includes stage 1 diorites and minor stage 2.diorite *** stage 1 diorites have produced concentric potassic and propylitic alteration zone and overprinted phyllic alteration and host much of the Cu-Mo-Au mineralization at *** Baogutu porphyry Cu-Mo-Au deposit consists of unusually disseminated and minor vein-style mineralization. The fluid evolution occurred in stage 1 diorite from late magmatic stage to hydrothermal stage(stages 1B and 1C) is constructed based on alteration and fluid inclusion analysis by microthermometry,Raman Spectroscopy and Quadrupole Mass Spectrometer. Five fluid types are distinguished and they are L1(liquid-rich 2.phase),L2.liquid-vapor 2.phase),V1 (vapor-rich 2.phase),V2.mono-phase vapor),and H(multi-phase solid).The dominant inclusions rich in reductive CH plus HO while minor inclusions rich in CH and *** inclusions in quartz from the late magmatic stage contain the most brine inclusions and less other inclusions with CH-rich and HO-rich *** inclusions in quartz from stage 1B contain all fluid types and have CH-rich and CH + HO compositions with rare *** inclusions in quartz from stage 1C are characterized by more vapor inclusions without brine inclusions and a clear CO concentration in a few assemblages with CH + CO composition. Using microthermometry,we estimate fluid trapping conditions at T>400℃and P= 1500 to 3.00 bar in late magmatic stage,T= 2.0 to 400℃and P = 50 to 3.0} bar in disseminated quartz in stage 1B,T= 180 to 400℃and P = 2. to 2.0 bar in vein quartz in stage 1B,and T= 170 to 400℃and P = 2. to 2.0 bar in stage *** late magmatic conditions are compatible with the fluid evolution as a result of CH-rich inclusions derived from mantle *** hydrothermal conditions in stages 1B and 1C with small P-T fluctuations are compatible wit

关键词： Methane-rich fluid inclusions The Baogutu porphyry Cu-Mo-Au deposit Western Junggar Xinjiang

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