福建武平悦洋银多金属矿东矿段蚀变岩特征及其找矿意义
|
摘要
利用岩相学、矿相学、电子探针等方法,研究了武平悦洋银多金属矿东矿段围岩蚀变、构造特征与成矿之间的关系。区内围岩蚀变具有分带性,垂向上从地表向深部,表现为从碳酸盐化带→水云母化+地开石化带→硅化+冰长石化带(银、金矿化)→绢云母化带(银铜矿化)的蚀变分带;北东向和北西向2组断裂中及其交会部位形成的围岩蚀变从矿体浅部到深部依次为黄铁矿化→黄铁矿化、硅化→绢云母化。蚀变带的空间展布及内部分带特征明显受矿区岩相的"三层结构"及断裂控制。矿化蚀变总体上分布于"三层结构"的中部层的紫金山复式岩体中。区内蚀变带是寻找低硫化型浅成低温热液矿床的重要找矿标志,浅部碳酸盐化带、中部硅化+冰长石化带、深部绢英岩化带,其中中部的硅化+冰长石化带是矿体的矿化蚀变带。
In this paper, petrographic, mineralogical and electron probe methods are used to study the relationship between alteration, structural characteristics and mineralization of surrounding rocks in the easten ore section of Yueyang silver polymetallic mining area. The alteration of surrounding rocks in the zone is zonation, which vertically extends from the surface to the depth, and is manifested as zonation from carbonate zonation-hydromica + geocalcite + silicification + glacial feldspathization(silver and gold mineralization) to sericite(silver and copper mineralization). The wall rock alteration formed in the NE and NW faults and their intersections is pyritization-pyritization, silicification-sericitization from the shallow to the deep of the ore body.The spatial distribution and internal zoning characteristics of the altered zone are obviously controlled by the "three-layer structure" and faults of the lithofacies in the mining area. The mineralized alteration zones are generally distributed in the Zijinshan complex rock mass in the middle of the "three-layer structure". Alteration zones are important prospecting indicators for low-sulfur epithermal deposits. The shallow carbonation zone, the middle silicified albitization zone and the deep sericitization zone, of which the middle silicified albitization zone is the mineralization alteration zone hosting ore bodies.
In this paper, petrographic, mineralogical and electron probe methods are used to study the relationship between alteration, structural characteristics and mineralization of surrounding rocks in the easten ore section of Yueyang silver polymetallic mining area. The alteration of surrounding rocks in the zone is zonation, which vertically extends from the surface to the depth, and is manifested as zonation from carbonate zonation-hydromica + geocalcite + silicification + glacial feldspathization(silver and gold mineralization) to sericite(silver and copper mineralization). The wall rock alteration formed in the NE and NW faults and their intersections is pyritization-pyritization, silicification-sericitization from the shallow to the deep of the ore body.The spatial distribution and internal zoning characteristics of the altered zone are obviously controlled by the "three-layer structure" and faults of the lithofacies in the mining area. The mineralized alteration zones are generally distributed in the Zijinshan complex rock mass in the middle of the "three-layer structure". Alteration zones are important prospecting indicators for low-sulfur epithermal deposits. The shallow carbonation zone, the middle silicified albitization zone and the deep sericitization zone, of which the middle silicified albitization zone is the mineralization alteration zone hosting ore bodies.
引文
1 张锦章.紫金山矿集区地质特征,矿床模型与勘查实践.矿床地质,2013,32(4).
2 陈国荣.福建武平何屋一带银多金属矿找矿前景.福建地质,2013,32(1).
3 黄铁心,刘晓东,张金成.碧田金矿-石英-冰长石型浅成低温热液贵金属矿床.地质地球化学,1996,24(6).
4 叶美芳,刘三,解古巍.应用扫描电镜-X射线衍射-电子探针研究北山斑岩铜矿区绢英岩中白色云母的特征.矿岩测试,2016,35(2).
5 林全胜.福建武平悦洋银多金属矿床特征及成因探讨.福建地质,2006,25(2).
6 范玲,王士元,廖有伟.冰长石的标型及其在金矿找矿中的标志作用.新疆大学学报(自然科学版),2005,19(2).
7 鲁美,申硕果,王碧雪.福建紫金山矿田金、银赋存状态及黄铁矿标型研究.现代地质,2016,30(2).
8 徐国风,邵洁涟.黄铁矿的标型特征及其实际意义.地质论评,1980,26 (6) .
9 宫丽,马光.黄铁矿的成分标型特征及其在金属矿床中的指示意义.地质找矿论丛,2011,26(2).
10 Bajwah Z U,Seccombe P K,Offler R.Trace element distribution,Co:Ni ratios and genesis of Big Cadia iron-deposit,New South Wales,Austaralia.Mineral Deposita,1987,22.
11 严育通,李胜荣,贾宝剑,等.中国不同成因类型金矿床的黄铁矿成分标型特征及其统计分析.地质前缘,2012,19(4).
2 陈国荣.福建武平何屋一带银多金属矿找矿前景.福建地质,2013,32(1).
3 黄铁心,刘晓东,张金成.碧田金矿-石英-冰长石型浅成低温热液贵金属矿床.地质地球化学,1996,24(6).
4 叶美芳,刘三,解古巍.应用扫描电镜-X射线衍射-电子探针研究北山斑岩铜矿区绢英岩中白色云母的特征.矿岩测试,2016,35(2).
5 林全胜.福建武平悦洋银多金属矿床特征及成因探讨.福建地质,2006,25(2).
6 范玲,王士元,廖有伟.冰长石的标型及其在金矿找矿中的标志作用.新疆大学学报(自然科学版),2005,19(2).
7 鲁美,申硕果,王碧雪.福建紫金山矿田金、银赋存状态及黄铁矿标型研究.现代地质,2016,30(2).
8 徐国风,邵洁涟.黄铁矿的标型特征及其实际意义.地质论评,1980,26 (6) .
9 宫丽,马光.黄铁矿的成分标型特征及其在金属矿床中的指示意义.地质找矿论丛,2011,26(2).
10 Bajwah Z U,Seccombe P K,Offler R.Trace element distribution,Co:Ni ratios and genesis of Big Cadia iron-deposit,New South Wales,Austaralia.Mineral Deposita,1987,22.
11 严育通,李胜荣,贾宝剑,等.中国不同成因类型金矿床的黄铁矿成分标型特征及其统计分析.地质前缘,2012,19(4).