安徽安庆铜矿床成矿地质条件及成因分析
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摘要
对安庆铜矿床成矿地质条件进行分析。研究结果表明:区内三叠系中统月山组(T2y)含膏盐白云质灰岩和下统南陵湖组(T1n)薄层灰岩与矿床的形成最为密切;月山岩体与围岩的不规则状接触带构造及断裂构造为最主要的控矿构造;来自于上地幔的燕山早期中酸性钙碱性月山岩体为区内的成矿母岩。岩浆带为本区提供大量的成矿物质和热能,是成矿的决定因素;构造为成矿物质的运移和沉淀提供良好的通道和场所,是成矿的必备条件;地层主要以其有利的层位、岩性为成矿物质的沉淀提供良好的空间位置。在此基础上,结合成矿物质来源、形成条件、矿石组构、蚀变分带及成矿作用等方面对矿床成因进行分析,认为矿床成因属的以接触交代作用为主、岩浆贯入作用为辅形成的矽卡岩型铜矿床。
The strata concerning ore deposit formation consists of dolomitic limestone with thin layer of gypsum of middle Triassic Yueshan group(T2y) and limestone of lower Triassic Nanlinghu group(T1n);the ore-controlling structures are irregular contact zone between Yueshan intrusion and wall rock and faults structure;Yueshan intrusion is mineralization mother rock in this area,which was originated from upper mantle in early Yanshanian with mid-acid and calc-alkaline properties.The magma is the determinant for mineralization,brings about a lot of metallogenic fluid and metallogenic material;the structure which is a prerequisite for mineralization,provides the favorable passage and place for the migration and deposition of metallogenic material;the strata mainly with its favorable position and lithology provides favorable spatial location for metallogenic material deposition.On this basis,the genesis of deposit was researched combined with the ore-forming material,formation conditions,ore-controlling factors,ore fabrics,Alteration Zoning and mineralizing process.The results show that the Anqing copper deposit is skarn copper deposit controlled by contact metamorphism,supplemented by magma injection.
The strata concerning ore deposit formation consists of dolomitic limestone with thin layer of gypsum of middle Triassic Yueshan group(T2y) and limestone of lower Triassic Nanlinghu group(T1n);the ore-controlling structures are irregular contact zone between Yueshan intrusion and wall rock and faults structure;Yueshan intrusion is mineralization mother rock in this area,which was originated from upper mantle in early Yanshanian with mid-acid and calc-alkaline properties.The magma is the determinant for mineralization,brings about a lot of metallogenic fluid and metallogenic material;the structure which is a prerequisite for mineralization,provides the favorable passage and place for the migration and deposition of metallogenic material;the strata mainly with its favorable position and lithology provides favorable spatial location for metallogenic material deposition.On this basis,the genesis of deposit was researched combined with the ore-forming material,formation conditions,ore-controlling factors,ore fabrics,Alteration Zoning and mineralizing process.The results show that the Anqing copper deposit is skarn copper deposit controlled by contact metamorphism,supplemented by magma injection.
引文
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[14]周涛发,岳书仓,袁峰.安徽月山矿田成岩成矿作用[M].北京:地质出版社,2005:1146.ZHOU Taofa,YUE Shucang,YUAN Feng.Lithogenesis andmineralization in Yuesha[M].Beijing:Geological PublishingHouse,2005:1 146.
[15]周涛发,岳书仓.安徽月山矿田铜矿床的形成机制[J].长春地质学院学报,1997,27(7):310316.ZHOU Taofa,YUE Shucang.Mechanisms of metallogenesis forcopper deposits in Yueshan[J].Journal of Changchun Universityof Geoscience,1997,27(3):310 316.
[16]陈江峰,Foland K A,李学明,等.安徽月山岩体的40Ar/39Ar年龄及与其有关的成矿时代估计[J].现代地质,1991,5(1):91 99.CHEN Jiangfeng,Foland K A,LI Xueming,et al.40Ar/39Ar agesand the related metallogenic epoch of Yueshan intrusion inAnhui province[J].Geoscience,1991,5(1):91 99.
[17]安徽省地矿局326地质队.安徽省安庆地区成矿条件及铜金铁成矿预测[R].铜陵:安徽省地矿局326地质队,1990:1 200.Bureau of Geology and Mineral Resources of Anhui Province326 Geological Team.Mineral formation Condition andMetallogenic prognosis in Anqing area,Anhui Province[R].Tongling:Bureau of Geology and Mineral Resources of AnhuiProvince 326 Geological Team,1990:1 200.
[2]PAN Yuanming,PING Dong.The lower Changjiang(Yangzi/Yangtze River)metallogenic belt,east central China:Intrusion-and wall rock-hosted Cu-Fe-Au,Mo,Zn,Pb,Agdeposits[J].Ore Geology Reviews,1999,15(4):177 242.
[3]束学福.安庆夕卡岩型铁铜矿床地质地球化学特征及铁质来源研究[J].矿物岩石地球化学通报,2004,23(3):219224.SHU Xuefu.Geology and geochemistry characteristics ofAnqing skarn-type Fe-Cu deposit and its origin of ironmaterials[J].Bulletin of Mineralogy,Petrology andGeochemistry,2004,23(3):219 224.
[4]杨光树,温汉捷,胡瑞忠,等.安徽月山岩体岩石地球化学特征及成因[J].矿物学报,2007,27(3/4):406413.YANG Guangshu,WEN Hanjie,HU Ruizhong,et al.Petro-geochemical characteristics and genesis of Yueshanintrusion,Anhui province[J].Acta Mineralogica Sinica,2007,27(3/4):406 413.
[5]张乐骏,周涛发,范裕.安徽月山岩体的锆石SHRIMP U-Pb定年及其意义[J].岩石学报,2008,24(8):17251732.ZHANG Lejun,ZHOU Taofa,FAN Yu.SHRIMP U-Pb zircondating of Yueshan intrusion in the Yueshan ore field Anhui,andsignificance[J].Acta Petrologica Sinica,2008,24(8):1725 1732.
[6]刘园园,马昌前,张超,等.安徽月山闪长岩的成因探讨——锆石U-Pb定年及Hf同位素证据[J].地质科技情报,2009,28(5):22 30.LIU Yuanyuan,MA Changqian,ZHANG Chao,et al.Petrogenesis of Yueshan Pluton:Zircon U-Pb dating and Hfisotope evidence[J].Geological Science and TechnologyInformation,2009,28(5):22 30.
[7]YUAN Feng,ZHOU Taofa,LIU Xiaodong,et al.Geochemistryof rare earth elements of Anqing copper deposit in Anhuiprovince[J].Journal of Rare Earths,2002,20(3):64 68.
[8]刘晓东.安徽月山矿田成矿流体系统研究[D].合肥:合肥工业大学资源与环境工程学院,2000:122.LIU Xiaodong.The study of forming fluid system of Yueshanore field,Anhui province[D].Hefei:Hefei University ofTechnology.School of Resources and EnvironmentalEngineering,2000:1 22.
[9]杨光树,温汉捷,胡瑞忠,等.安庆矽卡岩型铁铜矿床流体包裹体研究[J].地球化学,2008,37(1):2736.YANG Guangshu,WEN Hanjie,HU Ruizhong,et al.Fluidinclusions of Anqing skarn-type Fe-Cu deposit,Anhuiprovince[J].Geochimica,2008,37(1):27 36.
[10]ZHOU Taofa,YUAN Feng,YUE Shucang,et al.Geochemistryand evolution of ore-forming fluids of the Yueshan Cu-Auskarn-and vein-type deposits,Anhui Province,South China[J].Ore Geology Reviews,2007,31(2):179 303.
[11]周涛发,岳书仓,袁峰.安徽月山矿田铜、金矿床氢氧同位素地球化学特征及成矿流体运输化学反应成矿动力学[J].安徽地质,2001,11(2):131139.ZHOU Taofa,YUE Shucang,YUAN Feng.H,O isotopegeochemistry and transport reaction dynamic processes ofreo-forming fluid for Cu,Au deposits in the Yueshan orefield,Anhui province[J].Geology of Anhui,2001,11(2):131 139.
[12]王训诚,周育才.安徽省安庆铜铁矿床地质特征及成因探讨[J].地质与勘探,1995,31(3):1623.WANG Xuncheng,ZHOU Yucai.The reserve scale of giant andsupergjant ore deposits:a scheme of international referentialstandards[J].Geology and Prospecting,1995,31(3):16 23.
[13]周涛发,岳书仓,刘晓东.长江中下游铜、金矿床密集区形成条件及矿床成因研究综述[J].地质科杖情报,1999,18(3):51 54.ZHOU Taofa,YUE Shuchang,LIU Xiaodong.Review onforming conditions and genesis of the copper,gold depositconcentrated districts in the middle and lower reaches of theYangtze River area[J].Geological Science and TechnologyInformation,1999,18(3):51 54.
[14]周涛发,岳书仓,袁峰.安徽月山矿田成岩成矿作用[M].北京:地质出版社,2005:1146.ZHOU Taofa,YUE Shucang,YUAN Feng.Lithogenesis andmineralization in Yuesha[M].Beijing:Geological PublishingHouse,2005:1 146.
[15]周涛发,岳书仓.安徽月山矿田铜矿床的形成机制[J].长春地质学院学报,1997,27(7):310316.ZHOU Taofa,YUE Shucang.Mechanisms of metallogenesis forcopper deposits in Yueshan[J].Journal of Changchun Universityof Geoscience,1997,27(3):310 316.
[16]陈江峰,Foland K A,李学明,等.安徽月山岩体的40Ar/39Ar年龄及与其有关的成矿时代估计[J].现代地质,1991,5(1):91 99.CHEN Jiangfeng,Foland K A,LI Xueming,et al.40Ar/39Ar agesand the related metallogenic epoch of Yueshan intrusion inAnhui province[J].Geoscience,1991,5(1):91 99.
[17]安徽省地矿局326地质队.安徽省安庆地区成矿条件及铜金铁成矿预测[R].铜陵:安徽省地矿局326地质队,1990:1 200.Bureau of Geology and Mineral Resources of Anhui Province326 Geological Team.Mineral formation Condition andMetallogenic prognosis in Anqing area,Anhui Province[R].Tongling:Bureau of Geology and Mineral Resources of AnhuiProvince 326 Geological Team,1990:1 200.
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