| Geology, Geochemistry and Genesis of the Hongshijing Gold Deposit in Ruoqiang,Xinjiang |
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| 作者姓名： | 肖惠良 周济元 王鹤年 崔炳芳 陈世忠 |
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| 作者单位： | Department of Earth Sciences and State Key Laboratory for Mineral Deposits Research，Nanjing University，Nanjing Institute of Geology and Mineral Resources，Department of Earth Sciences and State Key Laboratory for Mineral Deposits Research，Nanjing University，Nanjing Institute of Geology and Mineral Resources，Nanjing Institute of Geology and Mineral Resources Nanjing 210093，Nanjing Institute of Geology and Mineral Resources，Nanjing 210016，Nanjing 210016，Nanjing 210093，Nanjing 210016，Nanjing 210016 |
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| 基金项目： | theState305Program(960505)StateKeyLaboratoryforMineralDepositsResearchandModernAnalysisCenterNanjingUniversity . |
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| 摘 要： | 1IntroductionTheHongshijinggolddepositislocatedinthenorthofLuobupouLakeofRuoqiang ,about 30 0kmsouthwestofHamiCity ,Xinjiang .ItwasdiscoveredbytheSixthGeologicalTeamofXinjiangduringgeo chemicalexploration .TheHongshijinggolddeposit,whichoccursinthegold bearingformationcomposedofMiddleandLateCarboniferousvolcanicandpyroclasticrocks ,isabrittle ductileshearzonetypegolddepositcontrolledbyariftbelt.TheHongshijinggolddepositislocatedinthesouthwestoftheHongshi jing -Maotoushanmineralizationb…
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| 关 键 词： | 地质学 地球化学 起源 金矿床 成因 新疆 |
| 收稿时间： | 28 January 2008 |
Geology,geochemistry and genesis of the Hongshijing gold deposit in Ruoqiang,Xinjiang |
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| Xiao?Huiliang,Zhou?Jiyuan,Wang?Henian,Cui?Bingfang,Chen?Shizhong.Geology, Geochemistry and Genesis of the Hongshijing Gold Deposit in Ruoqiang,Xinjiang[J].Chinese Journal of Geochemistry,2003,22(3):280-288. |
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| Authors: | Xiao Huiliang Zhou Jiyuan Wang Henian Cui Bingfang Chen Shizhong |
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| Institution: | (1) Department of Earth Sciences and State Key Laboratory for Mineral Deposits Research, Nanjing University, 210093 Nanjing;(2) Nanjing Institute of Geology and Mineral Resources, 210016 Nanjing |
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| Abstract: | The Hongshijing gold deposit, which occurs in the Middle and Late Carboniferous volcanic and pyroclastic rocks, is of the
brittle-ductile shear zone type controlled by a rift belt. The Hongshijing gold deposit is one controlled by a brittle shear
zone located in the Late Paleozoic rift zone. The altered-rock type and quartz type orebodies are contained in the gold-bearing
formation, which consists of basalt and tuffaceous sandstone. The major mineralizing stage is at 267 - 261 Ma and reiteration
mineralizing stage at 220 - 209 Ma. The ore minerals include pyrite, magnetite, copper, bornite, ferrohydrite, native gold,
and the gangue minerals include quartz, sercite, calcite, Fe-dolomite, leucoxene, anorthose, biotite, baria, cajuelite, and
agustite. The wall rock alteration associated with gold mineralization comprises silicification, carbonization, pyritization,
sericitization and chloritization. The contents of gold are 2.4 × 10−9 in the gold-bearing formation, 5.7 × 10−9 in the tuffaceous sandstone and 1.4–1.5 × 10−9 in the basalt. Au is associated with Te, Se, Ni, Cu. Au = 74.331 × Te +0.0335 × Ni−0.0211 × Cu-2.650. Geochemical investigations
revealed that the mineralizing materials came from the basalt and tuffaceous sandstone in the gold-bearing formation. Under
the action of ductile brittle shear structure, the gold-bearing formation was metamorphosed and altered, and the ore-forming
materials activated, migrated and mineralized. The mineralizing fluid shows three mineralizing stages, with the characteristics
of middle to low temperature (381-115°C) and middle to low mass fractions of NaCl (2.18%-16.77%). The fluid is of the Ca2+ -Mg2+ -Na+ -Cl− type and H2O-NaCl system. According to the data from hydrogen and oxygen isotopic composition (δD = −114.6%= −68.8%, δ18OH
2O = −2.47%−5.91%), the conclusion can be drawn that the mineralizing fluid of the Hongshijing gold deposit was a kind of mixed
hydrothermal solution composed mainly of meteoric water, magmatic water and formation water in basalt and tuffaceous-sandstone
or metamorphic water. The results show the mineralizing fluid and mineralizing materials came from the basalt and suffaceous-sandstone
in the gold-bearing formation in Late Variscan orogeny. Under the action of brittle shearing, the gold-bearing formation was
metamorphosed and altered, and the ore-forming material activated, migrated and mineralized withT andP going down and changes in pH, Eh,f
O
2 andf
S
2 under the earth’s surface from 1.57 to 2.25 km.
This project was supported by the State 305 Program (96-05-05), State Key Laboratory for Mineral Deposits Research and Modern
Analysis Center, Nanjing University. |
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| Keywords: | geology geochemistry genesis Hongshijing gold deposit Xinjiang |
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