扬子陆块东南缘升天坪锌矿床地质特征、闪锌矿Rb-Sr定年及其地质意义
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摘要
升天坪锌矿床位于扬子陆块东南缘雪峰山地区,是湘西地区产于陡山沱组的中型锌矿床。采用同位素稀释法对主成矿期闪锌矿进行Rb-Sr同位素组成分析,获得等时线年龄为490 Ma,初始锶同位素组成~(87)Sr/~(86)Sr为0.71235。该等时线年龄代表了该矿床的主成矿阶段年龄,说明矿床形成的地质时代为晚寒武世,成矿作用发生于加里东中期。成矿作用时代与闪锌矿初始锶同位素比值特征反映成矿物质或成矿流体由基底岩石(板溪群)和震旦系碳酸盐岩地层共同提供。结合矿床地质特征与区内铅锌矿成矿地质背景,认为周边板块碰撞的远程效应为热液成矿提供了构造驱动力,加里东期的构造运动对升天坪锌矿床的形成起着重要作用。升天坪锌矿床严格受地层控制,矿床类型为沉积-改造型层控矿床。
Shengtianping zinc deposit is located in Xuefengshan region, which is at the southeastern part of Yangtze Block. It is amedium-size zinc deposit that occurs in the Doushantuo Formation in western Hunan Province. In this study, Rb, Sr isotope analysiswere carried out on the main metallogenic period of sphalerite using the isotopic dilution method. Rb-Sr analyses yield an isochron ageof 490 Ma and the initial strontium isotopic composition of~(87)Sr/~(86)Sr is 0.71235. The isochron age represents the timing of the mainmineralization stage of the deposit, indicating that the deposit was formed in the late Cambrian and the mineralization occurred in themiddle Caledonian. The characteristics of the sphalerite initial strontium isotope ratios reflect the far-field effect of the collisions ofsurrounding blocks, which provided a driving force for the hydrothermal mineralization, and the Caledonian tectonism plays animportant role in the formation of the Shengtianping zinc deposit. The Shengtianping zinc deposit is strictly strata-bound, and thedeposit belongs to the sedimentary-transformation type of strata-bound ore deposit.
Shengtianping zinc deposit is located in Xuefengshan region, which is at the southeastern part of Yangtze Block. It is amedium-size zinc deposit that occurs in the Doushantuo Formation in western Hunan Province. In this study, Rb, Sr isotope analysiswere carried out on the main metallogenic period of sphalerite using the isotopic dilution method. Rb-Sr analyses yield an isochron ageof 490 Ma and the initial strontium isotopic composition of~(87)Sr/~(86)Sr is 0.71235. The isochron age represents the timing of the mainmineralization stage of the deposit, indicating that the deposit was formed in the late Cambrian and the mineralization occurred in themiddle Caledonian. The characteristics of the sphalerite initial strontium isotope ratios reflect the far-field effect of the collisions ofsurrounding blocks, which provided a driving force for the hydrothermal mineralization, and the Caledonian tectonism plays animportant role in the formation of the Shengtianping zinc deposit. The Shengtianping zinc deposit is strictly strata-bound, and thedeposit belongs to the sedimentary-transformation type of strata-bound ore deposit.
引文
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彭建堂,胡瑞忠,赵军红,等.2003.湘西沃溪Au-Sb-W矿床中富放射成因锶的成矿流体及其指示意义[J].矿物岩石地球化学通报,22(3):193-196.
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沈战武,金灿海,代堰锫,等.2016.滇东北毛坪铅锌矿床的成矿时代:闪锌矿Rb-Sr定年[J].高校地质学报,22(2):213-218.
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舒良树,于津海,贾东,等.2008.华南东段早古生代造山带研究[J].地质通报,27(10):1581-1593.
石少华,邹源,朱继华,等.2016.湖南董家河地区矿产地质调查报告[R].湖南省地质调查院:1-207.
汤朝阳,段其发,邹先武,等.2009.鄂西-湘西地区震旦系灯影组岩相古地理与层控铅锌矿关系初探[J].地质论评,55(5):712-721.
王鹤年,周丽娅.2006.华南地质构造的再认识[J].高校地质学报,12(4):457-465.
谢新泉.2005.沅陵沈家垭金矿床围岩蚀变特征及地质意义[J].黄金,26(4):16-18.
杨红梅,蔡红,段瑞春,等.2012.硫化物Rb-Sr同位素定年研究进展[J].地球科学进展,27(4):379-385.
杨红梅,刘重芃,段瑞春,等.2015.贵州铜仁卜口场铅锌矿床Rb-Sr与Sm-Nd同位素年龄及其地质意义[J].大地构造与成矿学,39(5):855-865.
杨红梅,刘重芃,蔡红,等.2017.闪锌矿分相Rb-Sr体系定年机理初探[J].华南地质与矿产,33(4):344-353.
张自超.1995.我国某些元古宙及早寒武世碳酸盐岩石的锶同位素组成[J].地质论评,41(4):349-354.
张长青,李向辉,余金杰,等.2008.四川大梁子铅锌矿床单颗粒闪锌矿铷-锶测年及地质意义[J].地质评论,54(4):145-151.
周雄,温春齐,张学全,等.2010.西藏邦铺大型钼铜多金属矿床Rb-Sr等时线年龄及地质意义[J].高校地质学报,16(4):448-456.
周云,段其发,陈毓川,等.2015.湘西龙山江家垭铅锌矿床石英Rb-Sr同位素测年与示踪研究[J].中国地质,42(2):597-606.
周小进,杨帆.2007.中国南方新元古代-早古生代构造演化与盆地原型分析[J].石油实验地质,29(5):446-451.
Brannon J C,Podosek F A and Mclimans R K.1992a.A Permian Rb-Sr age for sphalerite from the Upper Mississippi Valley zinc-lead district,southwest Wisconsin[J].Nature,356:509-511.
Brannon J C,Frank A,Podosek F A,et al.1992b.A clue to the origin of dark and light bands of the 270 Ma Upper Mississippi Valley(UMV)zinc-lead district,southwest Wisconsin[J].Abstracts with Programs-Geological Society of America,24:353.
Christensen J N,Halliday A N,Stephen E K,et al.1993.Further evaluation of the Rb-Sr dating of sphalerite:The Nanisivik Precambrian MVTdeposit,Baffin Island,Canada[J].Abstracts with Programs-Geological Society of America,25:471.
Christensen J N,Halliday A N,Kenneth E L,et al.1995a.Direct dating of sulfides by Rb-Sr:Acritical test using the Polaris Mississippi Valley-type Zn-Pb deposit[J].Geochim.Cosmochim.Acta,59:5191-5197.
Christensen J N,Halliday A N,Vearncombe J R,et al.1995b.Testing models of large-scale crustal fluid flow using direct dating of sulfides:Rb-Sr evidence for early dewatering and formation of Mississippi Valley-type deposits,Canning Basin,Australia[J].Econ.Geo.,90:877-884.
Ludwig K R.2001.Users Manual for Isoplot/Ex Version 2.49:AGeochronlogical Tool Kit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center Special Publication,No.1a,1-55.
Melezhik V A,Gorokhov I M and Fallick A E.2002.Isotopic stratigraphy suggests Neoproterozoic ages and Laurentian ancestry for high-grade marbles from the North-Central Norwegian Caledonides[J].Geological Magazine,139(4):375-393.
Nakai S,Halliday A N,Kesler S E,et al.1990.Rb-Sr dating of sphalerites from Tennessee and the genesis of Mississippi Valley type ore deposits[J].Nature,346:354-357
Nakai S,Halliday A N,Kesler S E,et al.1993.Rb-Sr dating of sphalerites form Mississippi Vally type(MVT)ore deposit[J].Cosmochim Acta,57(2):417-427.
Pettke T and Diamond L W.1996.Rb-Sr dating of sphalerite based on fluid inclusion-host mineral isochrones:A calarification of why it works[J].Economic Geology,91:951-956.
Rong J Y,Zhan R B,Xu H G,et al.2010.Expansion of the Cathaysian Oldland through the Ordovician-Silurian transition:emerging evidence and possible dynamics[J].Sci.China(D),53:1-17.
Rong J Y,Chen X,Su Y Z,et al.2003.Silurian paleogeography of China[C]//Ed Langding,Mark E Johnson.Paleography outside of Laurentia.New York State Museum Bulletin,493:243-298.
Rong J Y and Zhan R B.2006.Surviving the end-Ordovician extinctions:evidence from the earliest Silurian brachiopods of northeastern Jiangxi and western Zhejiang provinces,East China[J].Lethaia,39(1):39-48.
Sangster D F.1996.Mississippi Valley-type lead-zinc[A]//Eck-strand O R,Sinclair W D and Thorpe R I,eds.Geology of Canadian Mineral Deposit Types.Geology of Canada,No.8:Geological Survey of Canada:253-261.
Tian S H,Gong Y L,Yang Z S,et al.2014.Rb-Sr and Sm-Nd Isochron Ages of the Dongmozhazhua and Mohailaheng Pb-Zn Ore Deposits in the Yushu area,southern Qinghai and Their Geological Implications[J].Acta Geologica Sinica(English Edition),88(2):558-569.
(1)湖南省地矿局407队. 2010.湖南省沅陵县升天坪铅锌矿区升天坪背斜北西翼矿段详查报告[R]
曹亮,段其发,周云.2015.湖北凹子岗锌矿床Rb-Sr同位素测年及其地质意义[J].中国地质,42(1):235-247.
曹亮,段其发,张权绪,等.2016.扬子陆块北缘冰洞山铅锌矿床闪锌矿Rb-Sr定年及其地质意义[J].矿物岩石地球化学通报,35(6):1280-1289.
杜国民,蔡红,梅玉萍.2012.硫化物矿床中闪锌矿Rb-Sr等时线定年方法研究——以湘西新晃打狗洞铅锌矿床为例[J].华南地质与矿产,28(2):175-180.
段其发,曹亮,曾健康,等.2014.湘西花垣矿集区狮子山铅锌矿床闪锌矿Rb-Sr定年及地质意义[J].地球科学(中国地质大学学报),39(8):977-999.
侯明兰,蒋少涌,姜耀辉,等.2006.胶东蓬莱金成矿区的S-Pb同位素地球化学和Rb-Sr同位素年代学研究[J].岩石学报,22(10):2524-2533.
韩以贵,李向辉,张世红,等.2007.豫西祁雨沟金矿单颗粒和碎裂状黄铁矿Rb-Sr等时线定年[J].科学通报,52(11):1307-1311.
刘建明,赵善仁,沈洁,等.1998.成矿流体活动的同位素定年方法评述[J].地球物理学进展,13(3):46-55.
李文博,黄智龙,许德如,等.2002.铅锌矿床Rb-Sr定年研究综述[J].大地构造与成矿学,26(4):434-441.
路远发.2004.GeoKit:一个用VBA构建的地球化学工具软件包[J].地球化学,33(5):459-464.
李厚民,陈毓川,王登红,等.2007.陕西南郑地区马元锌矿的地球化学特征及成矿时代[J].地质通报,26(5):546-552.
李铁刚,武广,刘军,等.2014.黔东北地区MVT型铅锌矿床闪锌矿Rb-Sr定年及其地质意义[J].矿床地质,34(4):257-270.
廖震文,王生伟,孙晓明,等.2015.大兴安岭北部甲乌拉铅锌银矿床Rb-Sr同位素测年及其地质意义[J].矿床地质,30(1):769-785.
彭建堂,胡瑞忠,赵军红,等.2003.湘西沃溪Au-Sb-W矿床中富放射成因锶的成矿流体及其指示意义[J].矿物岩石地球化学通报,22(3):193-196.
祁进平,宋要武,李双庆,等.2009.河南省栾川县西沟铅锌银矿床单矿物铷-锶同位素组成特征[J].岩石学报,25(11):2843-2854.
沈战武,金灿海,代堰锫,等.2016.滇东北毛坪铅锌矿床的成矿时代:闪锌矿Rb-Sr定年[J].高校地质学报,22(2):213-218.
舒良树.2006.华南前泥盆纪构造演化:从华夏地块到加里东期造山带[J].高校地质学报,12(4):418-431.
舒良树,于津海,贾东,等.2008.华南东段早古生代造山带研究[J].地质通报,27(10):1581-1593.
石少华,邹源,朱继华,等.2016.湖南董家河地区矿产地质调查报告[R].湖南省地质调查院:1-207.
汤朝阳,段其发,邹先武,等.2009.鄂西-湘西地区震旦系灯影组岩相古地理与层控铅锌矿关系初探[J].地质论评,55(5):712-721.
王鹤年,周丽娅.2006.华南地质构造的再认识[J].高校地质学报,12(4):457-465.
谢新泉.2005.沅陵沈家垭金矿床围岩蚀变特征及地质意义[J].黄金,26(4):16-18.
杨红梅,蔡红,段瑞春,等.2012.硫化物Rb-Sr同位素定年研究进展[J].地球科学进展,27(4):379-385.
杨红梅,刘重芃,段瑞春,等.2015.贵州铜仁卜口场铅锌矿床Rb-Sr与Sm-Nd同位素年龄及其地质意义[J].大地构造与成矿学,39(5):855-865.
杨红梅,刘重芃,蔡红,等.2017.闪锌矿分相Rb-Sr体系定年机理初探[J].华南地质与矿产,33(4):344-353.
张自超.1995.我国某些元古宙及早寒武世碳酸盐岩石的锶同位素组成[J].地质论评,41(4):349-354.
张长青,李向辉,余金杰,等.2008.四川大梁子铅锌矿床单颗粒闪锌矿铷-锶测年及地质意义[J].地质评论,54(4):145-151.
周雄,温春齐,张学全,等.2010.西藏邦铺大型钼铜多金属矿床Rb-Sr等时线年龄及地质意义[J].高校地质学报,16(4):448-456.
周云,段其发,陈毓川,等.2015.湘西龙山江家垭铅锌矿床石英Rb-Sr同位素测年与示踪研究[J].中国地质,42(2):597-606.
周小进,杨帆.2007.中国南方新元古代-早古生代构造演化与盆地原型分析[J].石油实验地质,29(5):446-451.
Brannon J C,Podosek F A and Mclimans R K.1992a.A Permian Rb-Sr age for sphalerite from the Upper Mississippi Valley zinc-lead district,southwest Wisconsin[J].Nature,356:509-511.
Brannon J C,Frank A,Podosek F A,et al.1992b.A clue to the origin of dark and light bands of the 270 Ma Upper Mississippi Valley(UMV)zinc-lead district,southwest Wisconsin[J].Abstracts with Programs-Geological Society of America,24:353.
Christensen J N,Halliday A N,Stephen E K,et al.1993.Further evaluation of the Rb-Sr dating of sphalerite:The Nanisivik Precambrian MVTdeposit,Baffin Island,Canada[J].Abstracts with Programs-Geological Society of America,25:471.
Christensen J N,Halliday A N,Kenneth E L,et al.1995a.Direct dating of sulfides by Rb-Sr:Acritical test using the Polaris Mississippi Valley-type Zn-Pb deposit[J].Geochim.Cosmochim.Acta,59:5191-5197.
Christensen J N,Halliday A N,Vearncombe J R,et al.1995b.Testing models of large-scale crustal fluid flow using direct dating of sulfides:Rb-Sr evidence for early dewatering and formation of Mississippi Valley-type deposits,Canning Basin,Australia[J].Econ.Geo.,90:877-884.
Ludwig K R.2001.Users Manual for Isoplot/Ex Version 2.49:AGeochronlogical Tool Kit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center Special Publication,No.1a,1-55.
Melezhik V A,Gorokhov I M and Fallick A E.2002.Isotopic stratigraphy suggests Neoproterozoic ages and Laurentian ancestry for high-grade marbles from the North-Central Norwegian Caledonides[J].Geological Magazine,139(4):375-393.
Nakai S,Halliday A N,Kesler S E,et al.1990.Rb-Sr dating of sphalerites from Tennessee and the genesis of Mississippi Valley type ore deposits[J].Nature,346:354-357
Nakai S,Halliday A N,Kesler S E,et al.1993.Rb-Sr dating of sphalerites form Mississippi Vally type(MVT)ore deposit[J].Cosmochim Acta,57(2):417-427.
Pettke T and Diamond L W.1996.Rb-Sr dating of sphalerite based on fluid inclusion-host mineral isochrones:A calarification of why it works[J].Economic Geology,91:951-956.
Rong J Y,Zhan R B,Xu H G,et al.2010.Expansion of the Cathaysian Oldland through the Ordovician-Silurian transition:emerging evidence and possible dynamics[J].Sci.China(D),53:1-17.
Rong J Y,Chen X,Su Y Z,et al.2003.Silurian paleogeography of China[C]//Ed Langding,Mark E Johnson.Paleography outside of Laurentia.New York State Museum Bulletin,493:243-298.
Rong J Y and Zhan R B.2006.Surviving the end-Ordovician extinctions:evidence from the earliest Silurian brachiopods of northeastern Jiangxi and western Zhejiang provinces,East China[J].Lethaia,39(1):39-48.
Sangster D F.1996.Mississippi Valley-type lead-zinc[A]//Eck-strand O R,Sinclair W D and Thorpe R I,eds.Geology of Canadian Mineral Deposit Types.Geology of Canada,No.8:Geological Survey of Canada:253-261.
Tian S H,Gong Y L,Yang Z S,et al.2014.Rb-Sr and Sm-Nd Isochron Ages of the Dongmozhazhua and Mohailaheng Pb-Zn Ore Deposits in the Yushu area,southern Qinghai and Their Geological Implications[J].Acta Geologica Sinica(English Edition),88(2):558-569.
(1)湖南省地矿局407队. 2010.湖南省沅陵县升天坪铅锌矿区升天坪背斜北西翼矿段详查报告[R]
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