藏南姐纳各普金矿地质特征及成矿时代约束——对扎西康矿集区铅锌金锑成矿系统的启示
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摘要
姐拉各普金矿是藏南扎西康矿集区内最新发现的金矿床,为了解该矿床的成矿时代,探讨其成矿机制,对金矿床中含矿石英脉中绢云母开展Ar-Ar年代学测试,以及氢氧同位素示踪,并与矿集区内铅锌金锑矿床开展对比研究。分析结果表明,姐纳各普金矿成矿时代为17.6±1.8 Ma,与矿集区内铅锌金锑成矿时代,以及错那洞穹窿中淡色花岗岩和伟晶岩形成时代相一致。结合同位素示踪,本文认为扎西康矿集区铅锌金锑成矿系统受错那洞片麻岩穹窿控制,形成时代主要集中在16.6~18.7 Ma,中新世岩浆活动提供的热量驱动地下水循环,并萃取地层或喜马拉雅基底成矿物质,在少量岩浆流体及成矿物质的参与下,沿南北向及其次级断裂构造部位上移聚集成矿,构成穹窿—岩浆—地层—构造四位一体的控矿系统。
Jienagepu gold deposit is the latest discovery in Zhaxikang ore concentrating area in southern Tibet. This paper,aiming at studying its mineralization age and mechanism,dates the sericite's Ar-Ar ages in ore-bearing quartz vein,and H & O isotopes tracking,and compares the results with Pb-Zn-Au-Sb deposits within the same area. Result shows that mineralization age of Jienagepu gold deposit is 17. 6 ± 1. 8 Ma,the same as the Pb-Zn-Au-Sb deposits and as light-colored granites and pegmatites in Cuonadong dome. Combined with H & O isotopes tracking,this paper thinks Pb-Zn-Au-Sb metallogenic system in Zhaxikang ore concentrating area is controlled by Cuonadong gneiss dome with mineralization age at 16. 6 ~ 18. 7 Ma. The Miocene magmatic events provided heat to drive the underground watercirculation and extracted the mineralizing elements from strata or Himalaya,mixed with a small quantity of magmatic fluid and mineralizing elements,migrated along SN-striking faults and concentrated to form the deposit,forming a fourin-one dome-magma-strata-structure ore controlling system.
Jienagepu gold deposit is the latest discovery in Zhaxikang ore concentrating area in southern Tibet. This paper,aiming at studying its mineralization age and mechanism,dates the sericite's Ar-Ar ages in ore-bearing quartz vein,and H & O isotopes tracking,and compares the results with Pb-Zn-Au-Sb deposits within the same area. Result shows that mineralization age of Jienagepu gold deposit is 17. 6 ± 1. 8 Ma,the same as the Pb-Zn-Au-Sb deposits and as light-colored granites and pegmatites in Cuonadong dome. Combined with H & O isotopes tracking,this paper thinks Pb-Zn-Au-Sb metallogenic system in Zhaxikang ore concentrating area is controlled by Cuonadong gneiss dome with mineralization age at 16. 6 ~ 18. 7 Ma. The Miocene magmatic events provided heat to drive the underground watercirculation and extracted the mineralizing elements from strata or Himalaya,mixed with a small quantity of magmatic fluid and mineralizing elements,migrated along SN-striking faults and concentrated to form the deposit,forming a fourin-one dome-magma-strata-structure ore controlling system.
引文
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[14]Sun Xiang,Zheng Youye,Wang Changming,et al.Identifying geochemical anomalies associated with Sb-Au-Pb-Zn-Ag mineralization in north Himalaya,southern Tibet[J].Ore Geology Reviews,2016,73:1-12
[15]Naeem M,Burg J P,Ahmad N,et al.U-Pb zircon systematics of the Mansehra Granitic complex:implications on the early Paleozoic orogenesis in NW Himalaya of Pakistan[J].Geosciences Journal,2016,20(4):427-447
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[18]Zhu Dicheng,Mo Xuanxue,Pan Guitang,et al.Petrogenesis of the earliest Early Cretaceous mafic rocks from the Cona area of the eastern Tethyan Himalaya in south Tibet:interaction between the incubating Kerguelen plume and the eastern Greater India lithosphere?[J].Lithos,2008,100(1/4):147-173
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[20]Zheng Yuanchuan,Hou Zengqian,Fu Qiang,et al.Mantle inputs to Himalayan anatexis:insights from petrogenesis of the Miocene Langkazi leucogranite and its dioritic enclaves[J].Lithos,2016,264:125-140
[21]Fu Jiangang,Li Guangming,Wang Genhou,et al.First field identification of the Cuonadong dome in southern Tibet:implications for EW extension of the north Himalayan gneiss dome[J].International Journal of Earth Sciences,2017,106(5):1581-1596
[22]张金阳,廖群安,李德威,等.藏南萨迦拉轨岗日淡色花岗岩特征及与变质核杂岩的关系[J].地球科学,2003,28(6):695-701
[23]Zeng Lingsen,Gao Li'E,Tang Suohang,et al.Eocene magmatism in the Tethyan Himalaya,southern Tibet[J].Geological Society,London,Special Publications,2015,412(1):287-316
[24]Zhang Hongfei,Harris N,Parrish R,et al.U-Pb ages of Kude and Sajia leucogranites in Sajia dome from north Himalaya and their geological implications[J].Chinese Science Bulletin,2004,49(19):2087-2092
[25]张进江,杨雄英,戚国伟,等.马拉山穹窿的活动时限及其在藏南拆离系—北喜马拉雅片麻岩穹窿形成机制的应用[J].岩石学报,2011,27(12):3535-3544
[26]Williams H,Turner S,Kelley S,et al.Age and composition of dikes in southern Tibet:new constraints on the timing of east-west extension and its relationship to postcollisional volcanism[J].Geology,2001,29(4):339-342
[27]Mahéo G,Leloup P H,Valli F,et al.Post 4 Ma initiation of normal faulting in southern Tibet.Constraints from the Kung Co halfgraben[J].Earth and Planetary Science Letters,2007,256(1):233-243
[28]聂凤军,胡朋,江思宏,等.藏南地区金和锑矿床(点)类型及其时空分布特征[J].地质学报,2005,79(3):373-385
[29]Ludwig K R.User's manual for isoplot 3.75:a geochronological toolkit for microsoft excel[M].Berkeley:Berkeley Geochronology Center,2012
[30]陈文,万渝生,李华芹,等.同位素地质年龄测定技术及应用[J].地质学报,2011(11):1917-1947
[31]张建芳,郑有业,张刚阳,等.西藏北喜马拉雅马扎拉金锑矿床地质特征及成矿作用[J].黄金,2011(1):20-24
[32]孟祥金,杨竹森,戚学祥,等.藏南扎西康锑多金属矿硅—氧—氢同位素组成及其对成矿构造控制的响应[J].岩石学报,2008,24(7):1649-1655
[33]高伟.藏南拆离带沙拉岗锑矿床地质地球化学特征及成因机制研究[D].北京:中国地质大学,2006
[34]张刚阳.藏南金锑多金属成矿带成矿模式与找矿前景研究[D].武汉:中国地质大学,2012
[35]李洪梁.西藏扎西康矿集区姐纳各普金矿构造背景[D].成都:成都理工大学,2016
[36]梁维,杨竹森,郑远川.藏南扎西康铅锌多金属矿绢云母ArAr年龄及其成矿意义[J].地质学报,2015,89(3):560-568
[37]林彬,唐菊兴,郑文宝,等.西藏柯月锌多金属矿床地质特征及成矿时代初步研究[J].矿床地质,2016,35(1):33-50
[38]Xie Yuling,Li Lamei,Wang Bogong,et al.Genesis of the Zhaxikang epithermal Pb-Zn-Sb deposit in southern Tibet,China:evidence for a magmatic link[J].Ore Geology Reviews,2017,80:891-909
[39]杜泽忠,顾雪祥,李关清,等.藏南拉木由塔锑(金)矿床S、Pb同位素组成及指示意义[J].现代地质,2011,25(5):853-860
[40]李金高.西藏中南部中生代大陆边缘复合式Sedex型锑、铜矿床研究[D].成都:成都理工大学,2000
[2]Webb A A G,Yin An,Dubey C S.U-Pb zircon geochronology of major lithologic units in the eastern Himalaya:implications for the origin and assembly of Himalayan rocks[J].Geological Society of America Bulletin,2013,125(3/4):499-522
[3]Zhang Jinjiang,Santosh M,Wang Xiaoxian,et al.Tectonics of the northern Himalaya since the India-Asia collision[J].Gondwana Research,2012,21(4):939-960
[4]Antolín B,Schill E,Grujic D,et al.E-W extension and block rotation of the southeastern Tibet:unravelling late deformation stages in the eastern Himalayas(NW Bhutan)by means of pyrrhotite remanences[J].Journal of Structural Geology,2012,42(0):19-33
[5]杨竹森,侯增谦,高伟,等.藏南拆离系锑金成矿特征与成因模式[J].地质学报,2006,80(9):1377-1391
[6]Zeng Lingsen,Liu Jing,Gao Lie,et al.Early Oligocene anatexis in the Yardoi gneiss dome,southern Tibet and geological implications[J].Chinese Science Bulletin,2009,54(1):104-112
[7]Hou Zengqian,Zheng Yuanchuan,Zeng Lingsen,et al.EoceneOligocene granitoids in southern Tibet:constraints on crustal anatexis and tectonic evolution of the Himalayan orogen[J].Earth and Planetary Science Letters,2012,349/350:38-52
[8]Pei Yingru,Sun Qingzhong,Zheng Yuanchuan,et al.Genesis of the Bangbu Orogenic gold deposit,Tibet:evidence from fluid inclusion,stable isotopes,and Ar-Ar geochronology[J].Acta Geologica Sinica,2016,90(2):722-737
[9]郑有业,多吉,马国桃,等.藏南查拉普岩金矿床特征、发现及时代约束[J].地球科学:中国地质大学学报,2007,32(2):185-193
[10]戚学祥,李天福,孟祥金,等.藏南特提斯喜马拉雅前陆断褶带新生代构造演化与锑金多金属成矿作用[J].岩石学报,2008,24(7):1638-1648
[11]郑有业,孙祥,田立明,等.北喜马拉雅东段金锑多金属成矿作用、矿床类型与成矿时代[J].大地构造与成矿学,2014,38(1):108-118
[12]Sun Xiaoming,Wei Huixiao,Zhai Wei,et al.Fluid inclusion geochemistry and Ar-Ar geochronology of the Cenozoic Bangbu orogenic gold deposit,southern Tibet,China[J].Ore Geology Reviews,2016,74:196-210
[13]Yang Zhusen,Hou Zengqian,Meng Xiangjin,et al.Postcollisional Sb and Au mineralization related to the south Tibetan detachment system,Himalayan orogen[J].Ore Geology Reviews,2009,36(1/3):194-212
[14]Sun Xiang,Zheng Youye,Wang Changming,et al.Identifying geochemical anomalies associated with Sb-Au-Pb-Zn-Ag mineralization in north Himalaya,southern Tibet[J].Ore Geology Reviews,2016,73:1-12
[15]Naeem M,Burg J P,Ahmad N,et al.U-Pb zircon systematics of the Mansehra Granitic complex:implications on the early Paleozoic orogenesis in NW Himalaya of Pakistan[J].Geosciences Journal,2016,20(4):427-447
[16]Wang Xiao Xian,Zhang Jin Jiang,Santosh M,et al.Andean-type orogeny in the Himalayas of south Tibet:implications for early Paleozoic tectonics along the Indian margin of Gondwana[J].Lithos,2012,154:248-262
[17]Zhu Dicheng,Chung Sunlin,Mo Xuanxue,et al.The 132 Ma Comei-Bunbury large igneous province:remnants identified in present-day southeastern Tibet and southwestern Australia[J].Geology,2009,37(7):583-586
[18]Zhu Dicheng,Mo Xuanxue,Pan Guitang,et al.Petrogenesis of the earliest Early Cretaceous mafic rocks from the Cona area of the eastern Tethyan Himalaya in south Tibet:interaction between the incubating Kerguelen plume and the eastern Greater India lithosphere?[J].Lithos,2008,100(1/4):147-173
[19]朱弟成,莫宣学,赵志丹,等.西藏南部二叠纪和早白垩世构造岩浆作用与特提斯演化:新观点[J].地学前缘,2009,16(2):1-20
[20]Zheng Yuanchuan,Hou Zengqian,Fu Qiang,et al.Mantle inputs to Himalayan anatexis:insights from petrogenesis of the Miocene Langkazi leucogranite and its dioritic enclaves[J].Lithos,2016,264:125-140
[21]Fu Jiangang,Li Guangming,Wang Genhou,et al.First field identification of the Cuonadong dome in southern Tibet:implications for EW extension of the north Himalayan gneiss dome[J].International Journal of Earth Sciences,2017,106(5):1581-1596
[22]张金阳,廖群安,李德威,等.藏南萨迦拉轨岗日淡色花岗岩特征及与变质核杂岩的关系[J].地球科学,2003,28(6):695-701
[23]Zeng Lingsen,Gao Li'E,Tang Suohang,et al.Eocene magmatism in the Tethyan Himalaya,southern Tibet[J].Geological Society,London,Special Publications,2015,412(1):287-316
[24]Zhang Hongfei,Harris N,Parrish R,et al.U-Pb ages of Kude and Sajia leucogranites in Sajia dome from north Himalaya and their geological implications[J].Chinese Science Bulletin,2004,49(19):2087-2092
[25]张进江,杨雄英,戚国伟,等.马拉山穹窿的活动时限及其在藏南拆离系—北喜马拉雅片麻岩穹窿形成机制的应用[J].岩石学报,2011,27(12):3535-3544
[26]Williams H,Turner S,Kelley S,et al.Age and composition of dikes in southern Tibet:new constraints on the timing of east-west extension and its relationship to postcollisional volcanism[J].Geology,2001,29(4):339-342
[27]Mahéo G,Leloup P H,Valli F,et al.Post 4 Ma initiation of normal faulting in southern Tibet.Constraints from the Kung Co halfgraben[J].Earth and Planetary Science Letters,2007,256(1):233-243
[28]聂凤军,胡朋,江思宏,等.藏南地区金和锑矿床(点)类型及其时空分布特征[J].地质学报,2005,79(3):373-385
[29]Ludwig K R.User's manual for isoplot 3.75:a geochronological toolkit for microsoft excel[M].Berkeley:Berkeley Geochronology Center,2012
[30]陈文,万渝生,李华芹,等.同位素地质年龄测定技术及应用[J].地质学报,2011(11):1917-1947
[31]张建芳,郑有业,张刚阳,等.西藏北喜马拉雅马扎拉金锑矿床地质特征及成矿作用[J].黄金,2011(1):20-24
[32]孟祥金,杨竹森,戚学祥,等.藏南扎西康锑多金属矿硅—氧—氢同位素组成及其对成矿构造控制的响应[J].岩石学报,2008,24(7):1649-1655
[33]高伟.藏南拆离带沙拉岗锑矿床地质地球化学特征及成因机制研究[D].北京:中国地质大学,2006
[34]张刚阳.藏南金锑多金属成矿带成矿模式与找矿前景研究[D].武汉:中国地质大学,2012
[35]李洪梁.西藏扎西康矿集区姐纳各普金矿构造背景[D].成都:成都理工大学,2016
[36]梁维,杨竹森,郑远川.藏南扎西康铅锌多金属矿绢云母ArAr年龄及其成矿意义[J].地质学报,2015,89(3):560-568
[37]林彬,唐菊兴,郑文宝,等.西藏柯月锌多金属矿床地质特征及成矿时代初步研究[J].矿床地质,2016,35(1):33-50
[38]Xie Yuling,Li Lamei,Wang Bogong,et al.Genesis of the Zhaxikang epithermal Pb-Zn-Sb deposit in southern Tibet,China:evidence for a magmatic link[J].Ore Geology Reviews,2017,80:891-909
[39]杜泽忠,顾雪祥,李关清,等.藏南拉木由塔锑(金)矿床S、Pb同位素组成及指示意义[J].现代地质,2011,25(5):853-860
[40]李金高.西藏中南部中生代大陆边缘复合式Sedex型锑、铜矿床研究[D].成都:成都理工大学,2000