安徽池州马头铜钼矿控矿因素及矿床成因
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摘要
安徽马头铜钼矿,位于长江中下游成矿带上,地处下扬子断裂拗陷带与皖南加里东造山带的衔接部位,矿(化)体赋存于志留系坟头组砂岩与花岗闪长斑岩的内外接触带上,钼矿脉充填于内外接触带的节理、裂隙中,铜钼品位较低。在对该矿床野外勘查的基础上,借鉴矿床专题科研综合分析成果,对该矿床的控矿因素进行了总结。该矿床花岗闪长斑岩与钼、铜成矿关系十分密切,矿体受构造控制明显,矿区主断层、次生断层是主要的导矿构造,接触带附近发育的节理裂隙是主要的容矿构造,坟头组砂岩与花岗闪长斑岩内外接触带是主要的赋矿部位。从矿床的规模、有用组分品位、与斑岩体的关系、矿石以细脉状为主的构造、围岩蚀变分带特征及成矿物质来源等方面判断,矿床为斑岩型铜钼矿床。
Matou copper-molybdenum mine was located in the northeast of Xifengmiao-Matou strike-slip fault in Chizhou of Anhui Province,where a medium scale copper-molybdenum was developed.The author studied the occurrence conditions of the copper-molybdenum and the characteristics of host structures.A summary of occurrences of the host joints was made systematically,and the stress field distribution figures in the study area in the metallogenic period were obtained.The host joints mainly showed the characteristics of tensional joints.Based on the field investigation and the available information,the author summarized the ore control elements of the deposit.The granodiorite-porphyry in the deposit had a close relationship with Mo,Cu metallogenic relationship.The ore body was evidently controlled by structures;the main and secondary faults were the main ore conducting structure,joints and fissures developed near the contact zone were the main hosting structures,the inner and outer contact zone of sand stone and granodiorite-porphyry in Fentou Formation.It was concluded that the deposit was a porphyry Cu-Mo type based on above analyses.
Matou copper-molybdenum mine was located in the northeast of Xifengmiao-Matou strike-slip fault in Chizhou of Anhui Province,where a medium scale copper-molybdenum was developed.The author studied the occurrence conditions of the copper-molybdenum and the characteristics of host structures.A summary of occurrences of the host joints was made systematically,and the stress field distribution figures in the study area in the metallogenic period were obtained.The host joints mainly showed the characteristics of tensional joints.Based on the field investigation and the available information,the author summarized the ore control elements of the deposit.The granodiorite-porphyry in the deposit had a close relationship with Mo,Cu metallogenic relationship.The ore body was evidently controlled by structures;the main and secondary faults were the main ore conducting structure,joints and fissures developed near the contact zone were the main hosting structures,the inner and outer contact zone of sand stone and granodiorite-porphyry in Fentou Formation.It was concluded that the deposit was a porphyry Cu-Mo type based on above analyses.
引文
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汤中立.2002.中国的小岩体岩浆矿床[J].中国工程科学,4(6):9-12.
邢凤鸣,徐祥.1995.安徽沿江地区中生代岩浆岩的基本特点[J].岩石学报,11(4):409-422.
董胜.2006.安徽省贵池地区区域地球化学特征及找矿意义[J].物探与化探,30(3):215-219,223.
杜杨松,曹毅,袁万鸣,等.2007.安徽沿江地区中生代碰撞后到造山后岩浆活动和壳幔相互作用——来自火山-侵入杂岩和岩石包体的证据[J].岩石学报,23(6):1294-1302.
FOLAK A,陈江峰.1993.安徽南部燕山期中酸性侵入岩的源区锶、钕同位素制约[J].地球化学,(3):261-268.
顾连兴,徐克勤.1987.长江中下游断裂拗陷带的构造发展与成矿作用[J].桂林冶金地质学院学报,7(4):243-251.
李盛汉.1995.安徽铜陵、贵池地区的环状航磁异常及其找矿意义[J].有色金属矿产与勘查,(4):228-232.
毛景文,张作衡,余金杰,等,2003.华北及邻区中生代大规模成矿的地球动力学背景:从金属矿床年龄精测得到启示[J].中国科学D辑:地球科学,33(4):289-300.
毛景文,STE IN H,杜安道,等.2004.长江中下游地区铜金(钼)矿Re-Os年龄测定及其对成矿作用的指示[J].地质学报,78(1):121-131.
邱家骧.1991.应用岩浆岩岩石学[M].武汉:中国地质大学出版社.
施俊法,唐金荣,周平,等.2010.世界找矿模型与矿产勘查[M].北京:地质出版社.
汤中立.2002.中国的小岩体岩浆矿床[J].中国工程科学,4(6):9-12.
邢凤鸣,徐祥.1995.安徽沿江地区中生代岩浆岩的基本特点[J].岩石学报,11(4):409-422.
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