| Ore fluid geochemistry of the Jinlongshan Carlintype gold ore belt in Shaanxi Province, China |
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| 作者姓名： | 张静 陈衍景 张夏新 李超 |
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| 作者单位： | STATE KEY LABORATORY OF GEOLOGICAL PROCESSES AND MINERAL RESOURCES CHINA UNIVERSITY OF GEOSCIENCES BEIJING 100083 CHINA，LABORATORY OF CRUST AND OROGEN EVOLUTION PEKING UNIVERSITY BEIJING 100871 CHINA，LABORATORY OF CRUST AND OROGEN EVOLUTION PEKING UNIVERSITY BEIJING 100871 CHINA INSTITUTE OF GEOCHEMISTRY CHINESE ACADEMY OF SCIENCES GUIYANG 550002 CHINA，DEPARTMENT OF GEOLOGY NORTHWEST UNIVERSITY XI'AN 710069 CHINA，LABORATORY OF CRUST AND OROGEN EVOLUTION PEKING UNIVERSITY BEIJING 100871 CHINA |
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| 基金项目： | Granted by the National Natural Science Foundation of China （Projects Nos, 49672119, 49972035, 40352003, and 40425006） and the Hundred Young Scientists Program of Chinese Academy of Sciences. |
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| 摘 要： | THEJINLONGSHANGOLDOREBELTINZHEN’ANCOUN TY,SOUTHERNSHAANXIPROVINCE,ISLOCATEDINTHEWEST ERNQINLINGGOLDPROVINCE(NO.16INFIG.1;CHEN YANJINGETAL.,2004).ITWASDISCOVEREDINTHEDEVO NIANSTRATAINTHELATE1980S).ITSGEOLOGICALSETTING ANDMETALLOGENICEVOLUTIONARESIMILARTOT…
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| 关 键 词： | 矿带 金 流动性 同位素 |
Environmental impacts from mining at Taojiang Mn ore deposit,central Hunan,China |
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| Peng,Bo,Xie,Shurong,Xiao,Meilian,Wu,Fucheng,Song,Zhi.Ore fluid geochemistry of the Jinlongshan Carlintype gold ore belt in Shaanxi Province, China[J].Chinese Journal of Geochemistry,2006,25(1):23-32. |
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| Authors: | Peng Bo Xie Shurong Xiao Meilian Wu Fucheng Song Zhi |
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| Institution: | (1) State Key laboratory of Geological Processes and Mineral Resources, China University of Geosciences, 100083 Beijing, China;(2) Laboratory of Crust and Orogen Evolution, Peking University, 100871 Beijing, China;(3) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(4) Department of Geology, Northwest University, 710069 Xi’ an, China |
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| Abstract: | The Jinlongshan gold ore belt in southern Shaanxi Province contains a number of Carlin-type gold deposits in the Qinling collisional
orogenic belt. Their fluid inclusions are of the Na+ − Cl− type. From the main metallogenic stage to later stages, the total quantity of anions and cations, temperature and deoxidation
parameter (R) for fluid inclusions all gradually decreased, suggesting the gradual intensification of fluid oxidation, the reduction of
metallogenic depth and the input of meteoric water and organic components. The deposits were formed during crustal uplifting
and hence had similar tectonic settings to orogenic gold deposits. The CO2 contents and CO2/H2O values of the ore fluid increased from early to late stages, and the wall-rock alteration is represented by decarbonation,
which is inconsistent with the characteristics of orogenic gold deposits. It is also discovered that Na+, K+, SO
4
2−
, Cl− and the total amounts of anions and cations in the inclusions in quartz are higher than those in the coexisting calcite.
The H, O and C isotope ratios indicate that the ore fluid was sourced from meteoric water and metamorphic devolatilisation
of the sedimentary rocks that host the ores. The high background δ18O and δ13C values of wall rocks resulted in high δ18O and δ13C values of ore fluid and also high δ18O and δ13C values of hydrothermal minerals such as quartz and carbonate. The carbon in ore fluid stemmed largely from the hosting strata.
The δ18O and δ13C values of Fe-calcite and the δD values of fluid inclusions are lower than those of calcite and quartz. In terms of the theory
of coordination chemistry, all these differences can be ascribed to water-rock interaction in the same fluid system, instead,
to the multisource of ore fluid.
Granted by the National Natural Science Foundation of China (Projects Nos. 49672119, 49972035, 40352003, and 40425006) and
the Hundred Young Scientists Program of Chinese Academy of Sciences. |
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| Keywords: | ore fluid Jinlongshan gold ore belt Carlin-type gold deposit isotope fluid inclusion Qinling Orogen |
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