云南普朗斑岩型铜矿床成矿流体特征及矿床成因
|
摘要
普朗铜矿床为滇西北地区一超大型斑岩型铜多金属矿床,它产于印支晚期石英闪长玢岩-石英二长斑岩-花岗闪长斑岩复式侵入体内,已有研究表明其形成于印支期。本次流体包裹体岩相学、显微测温及碳、氢、氧同位素综合研究表明:黄铜矿±黄铁矿-石英脉石英中主要发育含NaCl子矿物三相、气液两相及富气相3种类型的包裹体,成矿流体属中高温、高盐度(ω(NaCl))NaCl-H_2O热液体系,来源于印支晚期岩浆活动;辉钼矿±黄铜矿-石英脉石英中发育含NaCl子矿物三相、气液两相及含CO_23种类型的包裹体,成矿流体属中高温、高盐度NaCl-CO_2-H_2O热液体系,推测来源于后期岩浆活动;晚期黄铜矿±辉钼矿-方解石脉中主要发育气液两相包裹体,成矿流体为中低温、低盐度NaCl-H_2O热液体系,系NaClCO_2-H_2O型成矿流体演化产物。据此,结合区域广泛叠加发育燕山期斑岩钼矿化成矿背景,提出普朗超大型斑岩矿床可能存在燕山期Mo、Cu成矿作用叠加的认识。
The Pulang copper deposit is a superlarge porphyry type polymetallic deposit in northwestern Yunnan Province.It occurs in an Indosinian quartz diorite-quartz monzonite porphyry-granodiorite porphyry complex and previous study showed it was formed during the Indo-Chinese period.Comprehensive studies on petrology,microthermometry as well as carbon-hydrogen-oxygen isotope of fluid inclusions showed that there are such three types of fluid inclusions as halite-bearing three-phase,aqueous two-phase as well as vapor-rich in quartz from chalcopyrite ± pyrite-quartz veins,the oreforming fluids are of medium to high temperature,high salinity NaCl- H_2O type hydrothermal solutions and mainly derived from the Indonisian magmatism;whereas three types of fluid inclusions,including halite-bearing three-phase,aqueous two-phase as well as CO_2-bearing three-phase respectively are observed in quartz from molybdeniteichalcopyrite-quartz veins,the ore-forming fluids are of medium to high temperature,high salinity NaCl- CO_2- H_2O type hydrothermal solutions and might come from later magmatism.Only aqueous two-phase fluid inclusions are found in calcite from the latest chalcopyriteimolybdenite-calcite veins and the ore-forming fluids are of low to medium temperature,low salinity NaCl- H_2O type hydrothermal solutions,a later evolution product of the former NaCl-CO_2- H_2O type hydrothermal solutions is presumed.In combination with the regional metallogenic background that Mo and Cu mineralization in the Yanshanian period are widely spread in the area,so the conclusion can be drawn that in the Pulang copper deposit Mo and Cu mineralization of the Yanshanian period might also co-exist.
The Pulang copper deposit is a superlarge porphyry type polymetallic deposit in northwestern Yunnan Province.It occurs in an Indosinian quartz diorite-quartz monzonite porphyry-granodiorite porphyry complex and previous study showed it was formed during the Indo-Chinese period.Comprehensive studies on petrology,microthermometry as well as carbon-hydrogen-oxygen isotope of fluid inclusions showed that there are such three types of fluid inclusions as halite-bearing three-phase,aqueous two-phase as well as vapor-rich in quartz from chalcopyrite ± pyrite-quartz veins,the oreforming fluids are of medium to high temperature,high salinity NaCl- H_2O type hydrothermal solutions and mainly derived from the Indonisian magmatism;whereas three types of fluid inclusions,including halite-bearing three-phase,aqueous two-phase as well as CO_2-bearing three-phase respectively are observed in quartz from molybdeniteichalcopyrite-quartz veins,the ore-forming fluids are of medium to high temperature,high salinity NaCl- CO_2- H_2O type hydrothermal solutions and might come from later magmatism.Only aqueous two-phase fluid inclusions are found in calcite from the latest chalcopyriteimolybdenite-calcite veins and the ore-forming fluids are of low to medium temperature,low salinity NaCl- H_2O type hydrothermal solutions,a later evolution product of the former NaCl-CO_2- H_2O type hydrothermal solutions is presumed.In combination with the regional metallogenic background that Mo and Cu mineralization in the Yanshanian period are widely spread in the area,so the conclusion can be drawn that in the Pulang copper deposit Mo and Cu mineralization of the Yanshanian period might also co-exist.
引文
[1]李文昌,尹光侯,刘学龙,等.中甸普朗复式斑岩体演化及~(40)Ar-~(39)Ar同位素依据[J].地质学报,2009,83(10):1421-1429.Li Wenchang,Yin Guanghou,Liu Xuelong.et al.The Evolution and~(40)Ar-~(39)Ar Isotopic Evidence of the Pu-lang Complex in Zhongdian[J].Acta Geologica Sinica.2009,83(10):1421-1429.
[2]侯增谦,杨岳清,曲晓明,等.三江地区义敦岛弧造山带演化和成矿系统[J].地质学报,2004,78(1):109-118.Hou Zengqian.Yang Yueqing,Qu Xiaoming,et al.Tectonic Evolution and Mineralization Systems of the Yidun Arc Orogen in Sanjiang Region China[J].Acta Geologica Sinica,2001.78(1):109-118.
[3]曾普胜,李文昌,王海平,等.云南普朗印支期超大型斑岩铜矿床:岩石学及年代学特征[J].岩石学报,2006,22(4):989-1000.Zeng Pusheng.Li Wenchang,Wang Haiping.et al.The Indosinian Pulang Superlarge Porphyry Copper Deposit in Yunnan.China:Petrology and Chronology[J].Acta Petrologica Sinica,2006,22(4):989-1000.
[4]王守旭,张兴春,冷成彪,等.滇西北中甸普朗斑岩铜矿床地球化学与成矿机理初探[J].矿床地质,2007.26(3):277-288.Wang Shouxu,Zhang Xingchun.Leng Chengbiao.et al.A Tentative Study of Ore Geochemistry and Ore-Forming Mechanism of Pulang Porphyry Copper Deposit in Zhongdian,Northwestern Yunnan[J].Mineral Deposits.2007,26(3):277-288.
[5]李文昌,尹光侯,余海军,等.滇西北格咱火山-岩浆弧斑岩成矿作用[J].岩石学报,2011,27(9):2541-2552.Li Wenchang.Yin Guanghou.Yu Haijun,et al.The Porphyry Melallogenesis of Geza Volcanic Magmatic Arc in NW Yunnan[J].Acta Petrologica Sinica,2011,27(9):2541-2552.
[6]徐兴旺,蔡新平,屈文俊,等.滇西北红山晚白垩世花岗斑Cu-Mo成矿系统及其大地构造学意义[J].地质学报,2006,80(9):1422-1433.Xu Xingwang,Cai Xinping,Qu Wenjun.et al.Later Cretaceous Granitic Porphyritic Cu-Mo Mineralization System in the Hongshan Area,Northwestern Yunnan and Its Significances for Tectonics[J].Acta Geologica Sinica,2006,80(9):1422-1433.
[7]杨岳清,侯增谦,黄典豪,等.中甸弧碰撞造山作用与岩浆成矿系统[J].地球学报,2002,23(1):17-24.Yang Yueqing,Hou Zengqian,Huang Dianhao,et al.Collision Orogenic Process and Magmatic Metallogenic System in Zhongdian Arc[J].Acta Geoscientia Sinica,2002,23(1):17-24.
[8]王新松,毕献武,冷成彪,等.滇西北中甸红山Cu多金属矿床花岗斑岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].矿物学报,2011,31(3):315-327.Wang Xinsong.Bi Xianwu.Leng Chengbiao.et al.LA-ICP-MS Zircon U-Pb Dating of Granite Porphyry in the Hongshan Cu-Polymetallic Deposit,Zhongdian,Northwest Yunnan,China and Its Geological Implication[J].Acta Mineralogica Sinica,2011,31(3):315-327.
[9]王守旭,张兴春,冷成彪,等.滇西北普朗斑岩铜矿锆石离子探针U-Pb年成矿时限及地质意义[J].岩石学报,2008,24(10):2313-2321.Wang Shouxu,Zhang Xingchun,Leng Chengbiao,et al.Zircon SHRIMP U-Pb Dating of the Pulang Porphyry Copper Deposit,Northwestern Yunnan,China:The Ore-Forming Time Limitation and Geological Significance[J].Acta Petrologica Sinica,2008,24(10):2313-2321.
[10]Brown P E,Hagemann S G.MacFlincor and Its Application to Fluids in Archean Lode-Gold Deposits[J].Geochimica et Cosmochimica Acta,1995,59(19),3943-3952.
[11]张理刚.稳定同位素在地质科学中的应用[M].西安:陕西科学技术出版社,1985:91-94.Zhang Ligang.The Application of Stable Isotope to Geology[M].Xi'an:Shaanxi Science and Technology Publishing House,1985:91-94.
[12]张瑞斌,刘建明,叶杰,等.河北寿王坟铜矿碳-氧同位素地球化学特征及其意义[J].矿产与地质,2003,17(2):122-126.Zhang Ruibin,Liu Jianming,Ye Jie,et al.C&O Isotopic Geochemistry of Shouwangfen Copper Deposit,Hebei Province[J].Mineral Resources and Geology,2003,17(2):122-126.
[13]Roedder E.Fluid Inclusion Evidence for Immiscibility in Magmatic Differentiation[J].Geochim Cosmochim Acta,2005,56:5-20.
[14]Drummond S E,Ohmoto H.Chemical Evolution and Mineral Deposition in Boiling Hydrothermal Systems[J].Econ Geol,1985,80:126-147.
[15]Webster J D.The Exsolution of Magmatic Hydrosaline Liquids[J].Chemical Geology,2004,210:33-48.
[16]Lowenstern J B.Carbon Dioxide in Magmas and Implications for Hydrothermal Systems[J].Mineralium Deposita,2001,36:490-502.
[17]Halter W E,Webster J D.The Magmatic to Hydrothermal Transition and Its Bearing on Ore-Forming Systems[J].Chemical Geology,2004,210:1-6.
[2]侯增谦,杨岳清,曲晓明,等.三江地区义敦岛弧造山带演化和成矿系统[J].地质学报,2004,78(1):109-118.Hou Zengqian.Yang Yueqing,Qu Xiaoming,et al.Tectonic Evolution and Mineralization Systems of the Yidun Arc Orogen in Sanjiang Region China[J].Acta Geologica Sinica,2001.78(1):109-118.
[3]曾普胜,李文昌,王海平,等.云南普朗印支期超大型斑岩铜矿床:岩石学及年代学特征[J].岩石学报,2006,22(4):989-1000.Zeng Pusheng.Li Wenchang,Wang Haiping.et al.The Indosinian Pulang Superlarge Porphyry Copper Deposit in Yunnan.China:Petrology and Chronology[J].Acta Petrologica Sinica,2006,22(4):989-1000.
[4]王守旭,张兴春,冷成彪,等.滇西北中甸普朗斑岩铜矿床地球化学与成矿机理初探[J].矿床地质,2007.26(3):277-288.Wang Shouxu,Zhang Xingchun.Leng Chengbiao.et al.A Tentative Study of Ore Geochemistry and Ore-Forming Mechanism of Pulang Porphyry Copper Deposit in Zhongdian,Northwestern Yunnan[J].Mineral Deposits.2007,26(3):277-288.
[5]李文昌,尹光侯,余海军,等.滇西北格咱火山-岩浆弧斑岩成矿作用[J].岩石学报,2011,27(9):2541-2552.Li Wenchang.Yin Guanghou.Yu Haijun,et al.The Porphyry Melallogenesis of Geza Volcanic Magmatic Arc in NW Yunnan[J].Acta Petrologica Sinica,2011,27(9):2541-2552.
[6]徐兴旺,蔡新平,屈文俊,等.滇西北红山晚白垩世花岗斑Cu-Mo成矿系统及其大地构造学意义[J].地质学报,2006,80(9):1422-1433.Xu Xingwang,Cai Xinping,Qu Wenjun.et al.Later Cretaceous Granitic Porphyritic Cu-Mo Mineralization System in the Hongshan Area,Northwestern Yunnan and Its Significances for Tectonics[J].Acta Geologica Sinica,2006,80(9):1422-1433.
[7]杨岳清,侯增谦,黄典豪,等.中甸弧碰撞造山作用与岩浆成矿系统[J].地球学报,2002,23(1):17-24.Yang Yueqing,Hou Zengqian,Huang Dianhao,et al.Collision Orogenic Process and Magmatic Metallogenic System in Zhongdian Arc[J].Acta Geoscientia Sinica,2002,23(1):17-24.
[8]王新松,毕献武,冷成彪,等.滇西北中甸红山Cu多金属矿床花岗斑岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].矿物学报,2011,31(3):315-327.Wang Xinsong.Bi Xianwu.Leng Chengbiao.et al.LA-ICP-MS Zircon U-Pb Dating of Granite Porphyry in the Hongshan Cu-Polymetallic Deposit,Zhongdian,Northwest Yunnan,China and Its Geological Implication[J].Acta Mineralogica Sinica,2011,31(3):315-327.
[9]王守旭,张兴春,冷成彪,等.滇西北普朗斑岩铜矿锆石离子探针U-Pb年成矿时限及地质意义[J].岩石学报,2008,24(10):2313-2321.Wang Shouxu,Zhang Xingchun,Leng Chengbiao,et al.Zircon SHRIMP U-Pb Dating of the Pulang Porphyry Copper Deposit,Northwestern Yunnan,China:The Ore-Forming Time Limitation and Geological Significance[J].Acta Petrologica Sinica,2008,24(10):2313-2321.
[10]Brown P E,Hagemann S G.MacFlincor and Its Application to Fluids in Archean Lode-Gold Deposits[J].Geochimica et Cosmochimica Acta,1995,59(19),3943-3952.
[11]张理刚.稳定同位素在地质科学中的应用[M].西安:陕西科学技术出版社,1985:91-94.Zhang Ligang.The Application of Stable Isotope to Geology[M].Xi'an:Shaanxi Science and Technology Publishing House,1985:91-94.
[12]张瑞斌,刘建明,叶杰,等.河北寿王坟铜矿碳-氧同位素地球化学特征及其意义[J].矿产与地质,2003,17(2):122-126.Zhang Ruibin,Liu Jianming,Ye Jie,et al.C&O Isotopic Geochemistry of Shouwangfen Copper Deposit,Hebei Province[J].Mineral Resources and Geology,2003,17(2):122-126.
[13]Roedder E.Fluid Inclusion Evidence for Immiscibility in Magmatic Differentiation[J].Geochim Cosmochim Acta,2005,56:5-20.
[14]Drummond S E,Ohmoto H.Chemical Evolution and Mineral Deposition in Boiling Hydrothermal Systems[J].Econ Geol,1985,80:126-147.
[15]Webster J D.The Exsolution of Magmatic Hydrosaline Liquids[J].Chemical Geology,2004,210:33-48.
[16]Lowenstern J B.Carbon Dioxide in Magmas and Implications for Hydrothermal Systems[J].Mineralium Deposita,2001,36:490-502.
[17]Halter W E,Webster J D.The Magmatic to Hydrothermal Transition and Its Bearing on Ore-Forming Systems[J].Chemical Geology,2004,210:1-6.
目录
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |