小秦岭金矿田韧性剪切带的控矿规律及中深部成矿分析
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摘要
通过研究小秦岭金矿田构造控矿和构造赋矿特征,总结了成矿与韧性剪切带的关系,肯定了小秦岭金矿为韧性剪切带控制的矿床。成矿的同位素年龄表明,同一矿床中同韧性剪切带成矿作用和后韧性剪切带成矿作用往往同时存在,矿床普遍具有叠加改造成矿的特征。区内成矿流体组分与地幔流体组成相似,成矿流体的H、O、S、C、He、Ar同位素组成显示其初始来源为地幔。由于区内后期剥蚀少,从而使主要矿体得到了保存。韧性剪切带型金矿矿化带深度往往相当大,甚至大于矿化带长度。近年来的接替资源勘查工作证明中深部矿体的存在,因此,小秦岭金矿深部具良好找矿前景。
Based on the study of structural ore-controlling features and ore forming characteristics of the gold deposits in the Qinling Mountains,the relationship between gold mineralization and ductile shear zone is summarized and it is confirmed that gold deposits is mainly controlled by the ductile shear zone in Xiaoqinling.Isotopic age of mineralization indicates that the mineralization and the post mineralization of ductile shear zone often occur simultaneously in the same deposit.The deposits generally have the characteristics of superposition and reformation.The composition of ore-forming fluid is similar to that of mantle fluid in the study area.H,O,S,C,He,Ar isotopic compositions of the ore-forming fluid show that the initial fluid source is derived from the mantle.The main orebodies have been preserved because of less denudation in the late stage of the area.For gold deposit,the depth of gold mineralization belt of ductile shear zone type is quite large,even greater than the length of the mineralized zone.The exploration of replacement mineral resources in recent years has proved the existence of the middle-deep orebody.So Xiaoqinling gold deposit has agood prospecting prospect in the deep place.
Based on the study of structural ore-controlling features and ore forming characteristics of the gold deposits in the Qinling Mountains,the relationship between gold mineralization and ductile shear zone is summarized and it is confirmed that gold deposits is mainly controlled by the ductile shear zone in Xiaoqinling.Isotopic age of mineralization indicates that the mineralization and the post mineralization of ductile shear zone often occur simultaneously in the same deposit.The deposits generally have the characteristics of superposition and reformation.The composition of ore-forming fluid is similar to that of mantle fluid in the study area.H,O,S,C,He,Ar isotopic compositions of the ore-forming fluid show that the initial fluid source is derived from the mantle.The main orebodies have been preserved because of less denudation in the late stage of the area.For gold deposit,the depth of gold mineralization belt of ductile shear zone type is quite large,even greater than the length of the mineralized zone.The exploration of replacement mineral resources in recent years has proved the existence of the middle-deep orebody.So Xiaoqinling gold deposit has agood prospecting prospect in the deep place.
引文
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[21]陈国达.关于多因复成矿的一些问题[J].大地构造与成矿学,2000,24(3):199-201.
[22]余心起,刘俊来,张德会,等.小秦岭文峪花岗岩山体的隆升时代和幅度[J].科学通报,2013,58(33):3416-3428.
[23]翟裕生,张湖,宋鸿林,等.大型构造与超大型矿床[M].北京:地质出版社,1997.
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[26]万景林,李齐,王瑜.华山岩体中新生代抬升的裂变经迹证据[J].地震地质,2000,22(1):51-58.
[27]尹功明,卢演侍,赵华,等.华山新生代构造抬升[J].科学通报,2001,46(13):1121-1123.
[2] ROBERT F,BOULLIER A M,FIRDAOUS K.Gold quartz veins in metamorphic terranes and their bearing on the role of fluids in faulting[J].J Geophysical Research(B),1995(100):12861-12879.
[3]邵世才.试论韧性剪切作用与金的成矿[J].地质与资源,1996,5(2):142-146.
[4]何绍勋,等.韧性剪切带与成矿[M].北京:地质出版社,1996.
[5]闫卫东.小秦岭剪切带型金矿地质特征:兼论剪切带金矿系列、序列及形成机理[D].武汉:中国地质大学(武汉),1995.
[6]陈柏林,陈宣华,王小凤,等.阿尔金北缘地区韧性剪切带型金矿床构造控矿解析[J].地质学报,2002,76(2):235-243.
[7]石铨曾,尉向东,李明立,等.河南省东秦岭山脉北缘的推覆构造及伸展拆离构造[M].北京:地质出版社,2004.
[8]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001.
[9]冯建之,岳铮生,肖荣阁,等.小秦岭深部金矿成矿规律与成矿预测[M].北京:地质出版社,2009.
[10]黎世美,瞿伦全,苏振邦,等.小秦岭金矿地质和成矿预测[M].北京:地质出版社,1996.
[11]张灯堂,冯建之,李磊,等.华北克拉通南缘后大陆碰撞背景下的岩石圈演化及金、钼成矿规律探讨[J].大地构造与成矿学,2015,39(2):300-314.
[12]涂光炽.叠加与再造:被忽视了的成矿作用[J].湖南地质科技情报,1975:68-75.
[13]陈衍景,李晶,PIRAJNO F,等.东秦岭上宫金矿流体成矿作用:矿床地质和包裹体研究[J].矿物岩石,2004,24(3):1-12.
[14]王平安,陈毓川,裴荣富,等.秦岭造山带区域矿床成矿系列、构造、成矿旋回与演化[M].北京:地质出版社,1998.
[15]卢欣祥,尉向东,董有,等.小秦岭—熊耳山地区金矿特征与地幔流体[M].北京:地质出版社,2004.
[16]毛景文,胡瑞忠,陈毓川,等.大规模成矿作用与大型矿集区预测[M].北京:地质出版社,2005.
[17]冯建之,孙卫志,牛树银,等.华熊亚热柱-幔枝构造体系及其控矿作用[J].地质找矿论丛,2011,26(2):143-150.
[18]孙卫志,冯建之,燕建设,等.小秦岭幔枝构造与深部找矿[M].北京:科学出版社,2013.
[19]涂光炽.矿床的多成因问题[J].地质与勘探,1979,33(6):1-5.
[20]胡正国,钱壮志,闫广民,等.小秦岭拆离-变质杂岩核构造与金矿[M].西安:陕西科学技术出版社,1994.
[21]陈国达.关于多因复成矿的一些问题[J].大地构造与成矿学,2000,24(3):199-201.
[22]余心起,刘俊来,张德会,等.小秦岭文峪花岗岩山体的隆升时代和幅度[J].科学通报,2013,58(33):3416-3428.
[23]翟裕生,张湖,宋鸿林,等.大型构造与超大型矿床[M].北京:地质出版社,1997.
[24]吴晓贵,徐九华,魏浩,等.陕西东桐峪金矿流体包裹体初步研究[J].矿物岩石地球化学通报:中国矿物岩石地球化学学会第13届学术年会论文集,2011,30(增刊):169.
[25]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.
[26]万景林,李齐,王瑜.华山岩体中新生代抬升的裂变经迹证据[J].地震地质,2000,22(1):51-58.
[27]尹功明,卢演侍,赵华,等.华山新生代构造抬升[J].科学通报,2001,46(13):1121-1123.