滇东北巧家茂租铅锌矿成矿流体中的碳来源及矿床成因浅析
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摘要
巧家茂租铅锌矿是滇东北赋存于上震旦统灯影组白云岩地层中的代表性铅锌矿床之一,通过对5件不同产状矿体中与成矿有关的热液成因碳酸盐矿物白云石和方解石样品的C-O同位素示踪分析,发现成矿流体中的碳主要有3种来源:(1)白云石的δ~(13)C_(V-PDB)值介于0.6‰～3.5‰,δ~(18)O_(V-SMOW)值介于17.9‰～18.5‰,具有明显的海相碳酸盐岩去碳酸盐化来源特征;(2)方解石的δ~(13)C_(V-PDB)值主要集中于-5.7‰～-1.95‰,δ~(18)O_(V-SMOW)值介于13.80‰～17.5‰,来自碳酸盐岩的溶解作用;(3)下层矿的方解石δ~(13)C_(V-PDB)值出现了较大负值(δ~(13)C_(V-PDB)=-28.9‰),同时较高的氧同位素值(δ~(18)O_(V-SMOW)=17.6‰)显示有机物氧化来源的有机碳同位素组成特征。综合前人的研究成果,认为茂租铅锌矿的形成与二叠纪峨眉山玄武岩浆热液无关,成矿物质除了前人认为的来源于基底地层和赋矿地层,区域上泥盆系碳酸盐岩也是重要的铅锌源。
10 samples of dolomite and calcite,including 5 samples analyzed by previous worker,in Maozu Pb-Zn deposit which is hosted in the Upper Sinian Dengying Formation dolomite in Northeast Yunnan Pb-Zn metallogenic province,are presented for study of carbon and oxygen isotopes related to the Pb-Zn mineralization,and the origin of carbon in the ore-forming solution is discussed.It shows that there are 3 types of carbon sources in the carbonate minerals.The first type is resulted from the decarbonation of marine carbonates,evidenced by theδ~(13)C_(V-PDB )and δ~(18)O_(V-SMOW )values of dolomites(0.6‰ to 3.5‰ and 17.9‰to 18.5‰respectively).The second type is caused by the dissolution of carbonates,evidenced by the δ~(13)C_(V-PDB)values of calcites ranging from -5.7‰ to -1.95‰,and the δ~(18)O_(V-SMOW )values ranging from 13.80‰ to 17.5‰.The third type possesses organic characteristics and generates from the oxidation of organic matters with an obvious negative value of the δ~(13)C_(V-PDB)(-28.9‰)and a high δ~(18)O_(V-SMOW)value of 17.6‰.Based on the comprehensive analysis above,combined with previous researches,this paper put forward that the metallogenic materials for Maozu Pb-Zn deposit have nothing to do with the Permian Emeishan magmatic hydrothermal,but mainly derived from the basement rocks and ore-host strata,as well as the regional Devonian stratigraphy.
10 samples of dolomite and calcite,including 5 samples analyzed by previous worker,in Maozu Pb-Zn deposit which is hosted in the Upper Sinian Dengying Formation dolomite in Northeast Yunnan Pb-Zn metallogenic province,are presented for study of carbon and oxygen isotopes related to the Pb-Zn mineralization,and the origin of carbon in the ore-forming solution is discussed.It shows that there are 3 types of carbon sources in the carbonate minerals.The first type is resulted from the decarbonation of marine carbonates,evidenced by theδ~(13)C_(V-PDB )and δ~(18)O_(V-SMOW )values of dolomites(0.6‰ to 3.5‰ and 17.9‰to 18.5‰respectively).The second type is caused by the dissolution of carbonates,evidenced by the δ~(13)C_(V-PDB)values of calcites ranging from -5.7‰ to -1.95‰,and the δ~(18)O_(V-SMOW )values ranging from 13.80‰ to 17.5‰.The third type possesses organic characteristics and generates from the oxidation of organic matters with an obvious negative value of the δ~(13)C_(V-PDB)(-28.9‰)and a high δ~(18)O_(V-SMOW)value of 17.6‰.Based on the comprehensive analysis above,combined with previous researches,this paper put forward that the metallogenic materials for Maozu Pb-Zn deposit have nothing to do with the Permian Emeishan magmatic hydrothermal,but mainly derived from the basement rocks and ore-host strata,as well as the regional Devonian stratigraphy.
引文
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[2]刘建明,刘家军,顾雪祥.沉积盆地中的流体活动及其成矿作用[J].岩石矿物学杂志,1997,16(4):341-352.
[3]周家喜,黄智龙,高建国,等.滇东北茂租大型铅锌矿床成矿物质来源及成矿机制[J].矿物岩石,2012,32(3):62-69.
[4]贺胜辉,荣惠锋,尚卫,等.云南茂租铅-锌矿床地质特征及成因研究[J].矿床与地质,2006,20(4-5):397-506.
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[8]包广萍,崔银亮,高建国.滇东北茂租铅锌矿床热液方解石稀土元素地球化学特征[J].矿物学报,2013,33(4):681-685.
[9]韩润生,邹海俊,胡彬,等.云南毛坪铅锌(银、锗)矿床流体包裹体特征及成矿流体来源[J].岩石学报,2007,23(9):2 109-2 118.
[10]黄智龙,陈进,韩润生,等.峨眉山玄武岩与铅锌成矿---以云南会泽铅锌矿为例[J].矿物学报,2001,31(4):681-688.
[11]王超伟,李元,罗海燕,等.云南毛坪铅锌矿床的成因探讨[J].昆明理工大学学报(理工版),2009,34(1):7-11.
[12]鲍淼,周家喜,黄智龙,等.铅锌矿床定年方法及川-滇-黔铅锌成矿域年代学研究进展[J].矿物学报,2011,31(3):391-396.
[13]刘文周.云南茂租铅锌矿矿床地质地球化学特征及成矿机制分析[J].成都理工大学学报(自然科学版),2009,36(5):480-487.
[14]Ohmoto H.Stable isotope geochemistry of ore deposits[J].Reviews in Mineralogy and Geochemistry,1986,16:491-559.
[15]Schidlowski M,Aharon P.Carbon cycle and carbon isotope record:Geochemical impact of life over 3.8Ga Earth history.In:Schidlowski M,Golubic S,Kimberley M M,et al.(eds.).Early Organic Evolution Implications for Mineral and Energy Resources[M].Berlin:SpringerVerlag,1992:147-175.
[16]Ohmoto H,Goldhaber M B.Sulfur and carbon isotopes.In:Barnes H L(ed.).Geochemistry of Hydrothermal Ore Deposits[M].New York:John Wiley&Sons,Inc.,1997:517-611.
[17]吴越,张长青,毛景文,等.扬子板块西南缘与印支期造山事件有关的MVT型铅锌矿床[J].矿床地质,2012,31(增刊):451-452.
[18]金灿海,张玙,沈战武,等.滇东北火德红铅锌矿矿床地质特征及成矿物质来源[J].矿物岩石,2016,36(4):50-56.
[19]李文博,黄智龙,陈进,等.云南会泽超大型铅锌矿床硫同位素和稀土元素地球化学研究[J].地质学报,2004,(4):507-518.
[20]秦建华,廖震文,朱斯豹,等.川滇黔相邻区碳酸盐岩容矿铅锌矿成矿特征[J].沉积与特提斯地质,2016,36(1):1-13.
(1)马玉银,董涛,张福亮,等.云南省巧家县茂租铅锌矿核查矿区资源储量核查报告[R].云南省煤田地质局昆明工程勘察公司,2010.
(2)张玙.川西甘孜-理塘结合带阿加隆洼类卡林型金成矿作用[R].北京:中国地质大学(北京),2011.
[2]刘建明,刘家军,顾雪祥.沉积盆地中的流体活动及其成矿作用[J].岩石矿物学杂志,1997,16(4):341-352.
[3]周家喜,黄智龙,高建国,等.滇东北茂租大型铅锌矿床成矿物质来源及成矿机制[J].矿物岩石,2012,32(3):62-69.
[4]贺胜辉,荣惠锋,尚卫,等.云南茂租铅-锌矿床地质特征及成因研究[J].矿床与地质,2006,20(4-5):397-506.
[5]Zhou J X,Huang Z L,Yan Z F.The origin of the Maozu carbonate-hosted Pb-Zn deposit,Southwest China:Constrained by C-O-S-Pb isotopic compositions and Sm-Nd isotopic age[J].Journal of Asian Earth Sciences,2013,73:39-47.
[6]赵准.滇东、滇东北地区铅锌矿床的成矿模式[J].云南地质,1995,14(4):350-354.
[7]柳贺昌,林文达.滇东北铅锌银矿床规律研究[M].昆明:云南大学出版社,1999.
[8]包广萍,崔银亮,高建国.滇东北茂租铅锌矿床热液方解石稀土元素地球化学特征[J].矿物学报,2013,33(4):681-685.
[9]韩润生,邹海俊,胡彬,等.云南毛坪铅锌(银、锗)矿床流体包裹体特征及成矿流体来源[J].岩石学报,2007,23(9):2 109-2 118.
[10]黄智龙,陈进,韩润生,等.峨眉山玄武岩与铅锌成矿---以云南会泽铅锌矿为例[J].矿物学报,2001,31(4):681-688.
[11]王超伟,李元,罗海燕,等.云南毛坪铅锌矿床的成因探讨[J].昆明理工大学学报(理工版),2009,34(1):7-11.
[12]鲍淼,周家喜,黄智龙,等.铅锌矿床定年方法及川-滇-黔铅锌成矿域年代学研究进展[J].矿物学报,2011,31(3):391-396.
[13]刘文周.云南茂租铅锌矿矿床地质地球化学特征及成矿机制分析[J].成都理工大学学报(自然科学版),2009,36(5):480-487.
[14]Ohmoto H.Stable isotope geochemistry of ore deposits[J].Reviews in Mineralogy and Geochemistry,1986,16:491-559.
[15]Schidlowski M,Aharon P.Carbon cycle and carbon isotope record:Geochemical impact of life over 3.8Ga Earth history.In:Schidlowski M,Golubic S,Kimberley M M,et al.(eds.).Early Organic Evolution Implications for Mineral and Energy Resources[M].Berlin:SpringerVerlag,1992:147-175.
[16]Ohmoto H,Goldhaber M B.Sulfur and carbon isotopes.In:Barnes H L(ed.).Geochemistry of Hydrothermal Ore Deposits[M].New York:John Wiley&Sons,Inc.,1997:517-611.
[17]吴越,张长青,毛景文,等.扬子板块西南缘与印支期造山事件有关的MVT型铅锌矿床[J].矿床地质,2012,31(增刊):451-452.
[18]金灿海,张玙,沈战武,等.滇东北火德红铅锌矿矿床地质特征及成矿物质来源[J].矿物岩石,2016,36(4):50-56.
[19]李文博,黄智龙,陈进,等.云南会泽超大型铅锌矿床硫同位素和稀土元素地球化学研究[J].地质学报,2004,(4):507-518.
[20]秦建华,廖震文,朱斯豹,等.川滇黔相邻区碳酸盐岩容矿铅锌矿成矿特征[J].沉积与特提斯地质,2016,36(1):1-13.
(1)马玉银,董涛,张福亮,等.云南省巧家县茂租铅锌矿核查矿区资源储量核查报告[R].云南省煤田地质局昆明工程勘察公司,2010.
(2)张玙.川西甘孜-理塘结合带阿加隆洼类卡林型金成矿作用[R].北京:中国地质大学(北京),2011.