安徽马头矿区热液成矿边界的地球化学标志
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摘要
成矿系统具有时间和空间边界,确定热液成矿边界不仅具有重要的理论研究意义,而且对指明找矿方向、指导矿产勘查具有重要实用价值。但是,目前热液成矿边界如何确定尚缺乏研究。文章在地球化学勘查长期实践和理论方法探讨的基础上,在安徽马头热液成因金属矿区开展试验,提出了确定和判断热液成矿边界的地球化学标志。在勘探剖面上,斑岩型Mo、Cu矿分布在由带出作用形成的Na2O等元素负异常之内,含矿地段粉砂岩和花岗闪长斑岩中Na2O带出量大于80%,稀土元素Eu表现出明显的负异常;在地表条件下,矿化带产出在Na2O含量为0.1%~0.2%的负异常之内,δ34S值小于3.2‰,显著低于矿区外围花岗岩的δ34S值。由此认为,Na2O带出量大于80%,稀土元素Eu的负异常是确定马头斑岩型钼铜矿深部成矿边界的地球化学标志;Na2O含量为0.1%~0.2%的负异常、δ34S值小于3.2‰,是确定该矿床外围成矿边界的地球化学标志。本研究不仅为马头勘查区深部、外围找矿和成矿前景评价提供了成功案例,而且对其他勘查区热液成矿边界的研究和确定具有借鉴作用。
The identification of temporal and spatial boundary of metallogenic system is not only of great significance in theoretic research,but also can guide the mineral exploration and provide direct information for deep and periphery prospecting of known deposits.However,at present that how to determine hydrothermal mineralization boundary is still a lack of research.On the basis of long-term practice and theory and method of geochemical exploration,this paper,taking Matou porphyry molybdenum copper mine of Anhui Province for an example,proposes some geochemical identification marks to determine and judge the boundary of hydrothermal ore-forming.The experimental results show that orebody is located in the negative anomalies system of some elements such as Na2 O.In ore output area the out put amount of Na2 O of powder sandstone and granite diorite porphyry is more than 80% and rare earth element Eu shows obvious negative anomaly.In the earth's surface,mineralized belt is located in the Na2 O negative anomaly,the content of Na2 O ranges from0.1%to 0.2%,and theδ34S value being less than 3.2‰is significantly lower than that of granite in mining area periphery.Therefore,we infer that the output amount of Na2 O being more than 80% with the negative anomaly of rare earth element Eu,is the geochemistry identification mark of deep metallogenic boundary of Matou porphyry mine.Na2 O negative anomaly with content ranging from 0.1%to 0.2% andδ34S value being less than 3.2‰ are the geochemical marks of the peripheral metallogenic boundary.Our test results provide a reference for deep and periphery prospecting of Matou deposit and have a broad application prospect in delineating temporal and spatial boundary of exploration area.
The identification of temporal and spatial boundary of metallogenic system is not only of great significance in theoretic research,but also can guide the mineral exploration and provide direct information for deep and periphery prospecting of known deposits.However,at present that how to determine hydrothermal mineralization boundary is still a lack of research.On the basis of long-term practice and theory and method of geochemical exploration,this paper,taking Matou porphyry molybdenum copper mine of Anhui Province for an example,proposes some geochemical identification marks to determine and judge the boundary of hydrothermal ore-forming.The experimental results show that orebody is located in the negative anomalies system of some elements such as Na2 O.In ore output area the out put amount of Na2 O of powder sandstone and granite diorite porphyry is more than 80% and rare earth element Eu shows obvious negative anomaly.In the earth's surface,mineralized belt is located in the Na2 O negative anomaly,the content of Na2 O ranges from0.1%to 0.2%,and theδ34S value being less than 3.2‰is significantly lower than that of granite in mining area periphery.Therefore,we infer that the output amount of Na2 O being more than 80% with the negative anomaly of rare earth element Eu,is the geochemistry identification mark of deep metallogenic boundary of Matou porphyry mine.Na2 O negative anomaly with content ranging from 0.1%to 0.2% andδ34S value being less than 3.2‰ are the geochemical marks of the peripheral metallogenic boundary.Our test results provide a reference for deep and periphery prospecting of Matou deposit and have a broad application prospect in delineating temporal and spatial boundary of exploration area.
引文
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[3]赵鹏大.成矿定量预测与深部找矿[J].地学前缘,2007,14(5):1-10.
[4]叶天竺,薛建玲.金属矿床深部找矿中的地质研究[J].中国地质,2007,34(5):855-869.
[5]王登红,许建祥,张家菁,等.华南深部找矿有关问题探讨[J].地质学报,2008,82(7):865-872.
[6]吕志成,吕古贤,李永胜,等.深部找矿新进展对矿床成矿模式研究的意义[J].地质通报,2011,30(4):532-537.
[7]施俊法,周平,唐金荣,等.关于金属矿床深部找矿关键技术发展战略的思考[J].地质通报,2009,28(2/3):198-207.
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[9]侯增谦,杨岳清,王海平,等.三江义敦岛弧碰撞造山过程与成矿系统[M].北京:地质出版社,2003:140-143.
[10]汤中立,白云来.华北古大陆西南缘构造格架与成矿系统[J].地学前缘,1999,6(2):271-283.
[11]翟裕生.论成矿系统[J].地学前缘,1999,6(1):13-27.
[12]芮宗瑶,王龙生,王义天.成矿系统的始态、终态及其过程[J].矿床地质,2002,21(2):137-148.
[13]邓军,杨立强,方云,等.成矿系统嵌套分形结构和自有序效应[J].地学前缘,2000,7(1):133-146.
[14]邓军,王庆飞,杨立强,等.胶东西北部金热液成矿系统内部结构解析[J].地球科学,2005,30(1):102-108.
[15]姚书振,周宗桂,宫勇军,等.初论成矿系统的时空结构及其构造控制[J].地质通报,2011,30(4):469-477.
[16]方维萱,胡瑞忠,苏文超,等.扬子地块南缘及邻区大陆动力成矿系统、成矿系列特征与找矿方向[J].矿物学报,2001,21(4):561-570.
[17]毛景文,杨建民,韩春明,等.东天山铜多金属矿床成矿系统和成矿地球动力学模型[J].地球科学,2002,27(4):413-424.
[18]姚书振,丁振举,周宗桂,等.秦岭造山带金属成矿系统[J].地球科学,2002,27(5):599-604.
[19]邓晋福,戴圣潜,赵海玲,等.铜陵Cu-Au(Ag)成矿区岩浆流体成矿系统和亚系统的识别[J].矿床地质,2002,21(4):317-322.
[20]华仁民,陈培荣,张文兰,等.华南中、新生代与花岗岩类有关的成矿系统[J].中国科学:D辑,2003,33(4):335-343.
[21]张德全,佘宏全,李大新,等.紫金山地区的斑岩浅成热液成矿系统[J].地质学报,2003,77(2):253-261.
[22]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,2004,28(1):109-120.
[23]邓军,王庆飞,黄定华,等.铜陵矿集区构造流体成矿系统演化格架[J].地学前缘,2004,11(1):121-129.
[24]李文昌,余海军,尹光候.西南“三江”格咱岛弧斑岩成矿系统[J].岩石学报,2013,29(4):1129-1144.
[25]翟裕生,彭润民,邓军,等.成矿系统分析与新类型矿床预测[J].地学前缘,2000,7(1):123-132.
[26]翟裕生.成矿系统研究与找矿[J].地质调查与研究,2003,26(2):65-71.
[27]翟裕生.地球系统、成矿系统到勘查系统[J].地学前缘,2007,14(1):172-181.
[28]翟裕生,王建平,邓军,等.成矿系统时空演化及其找矿意义[J].现代地质,2008,22(2):143-150.
[29]翟裕生,王建平,彭润民,等.叠加成矿系统与多成因矿床研究[J].地学前缘,2009,16(6):282-290.
[30]朱创业.成矿系统研究现状及发展趋势[J].成都理工学院学报,2000,27(1):50-53.
[31]吕古贤.关于矿田地质学的初步探讨[J].地质通报,2011,30(4):478-486.
[32]吕古贤,李秀章,张迎春,等.矿田地质学的研究和发展问题[J].地质与勘探,2012,48(6):1143-1150.
[33]贾跃明.流体成矿系统与成矿作用研究[J].地学前缘,1996,3(4):253-258.
[34]马生明,朱立新,刘崇民,等,斑岩型Cu(Mo)矿床中微量元素富集贫化规律研究[J].地球学报,2009,30(6):821-830.
[35]徐明钻,朱立新,马生明,等.北山地区夕卡岩型铜矿元素表生活动性规律:以辉铜山铜矿为例[J].吉林大学学报:地球科学版,2011,41(4):1056-1066.
[36]胡兆鑫,马生明,朱立新,等.安徽池州地区元素表生活动规律研究[J].矿产勘查,2013,4(6):678-684.
[37]马生明,朱立新,刘海良,等.甘肃北山辉铜山铜矿地球化学异常结构研究[J].地球学报,2011,32(4):405-412.
[38]马生明,朱立新,席明杰,等.识别分散矿化的地球化学勘查方法探讨:以内蒙古垦山试验区为例[J].地质与勘探,2011,47(6):1124-1132.
[39]马生明,朱立新,唐世新,等.甘肃北山白山堂铜矿外围找矿靶区地球化学评价方法示范[J].地球学报,2013,34(3):338-346.
[40]Ma S M,Zhu L X,Liu C M,et al.Anomaly models of spatial structures for copper-molybdenum ore deposits and their application[J].Acta Geologica Sinica:English Edition,2013,87(3):843-857.
[41]马生明,朱立新.热液成因有色金属矿多维异常体系:以马头斑岩型钼铜矿为例[J].吉林大学学报:地球科学版,2014,44(1):134-144.
[42]席明杰,马生明,朱立新,等.硫同位素在地球化学异常成因研究中的应用[J].地质学报,2009,83(5):705-718.
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