甘肃北山南带大旗山铅锌多金属矿床的发现及找矿意义
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摘要
大旗山铅锌多金属矿床是甘肃省发现的首例陆相火山热液型铅锌多金属矿床,位于甘肃北山南带大奇山境内。矿床的产出受区域东大泉—金场沟断裂和红柳园—大奇山—帐房山深大断裂的控制,位于区域性断裂与火山机构(火山构造洼地)交汇部位。矿区初步圈定铅锌矿体3条,矿体长1 196 m～2 500 m,厚度1. 48 m～10. 01 m,Pb+Zn分布于0. 536%～12. 996%,共生银、铜和锡,银最高可达800×10-6。综合成矿地质背景、地质特征、矿产分布规律、控矿因素、区域地球化学特征,认为本区具有形成大型陆相火山热液型内生金属矿床成矿潜力,加大综合研究及区域找矿力度,有望取得找矿突破。本次找矿发现对该区域寻找铅锌多金属矿种和陆相火山热液型内生金属矿床具有重要借鉴和指导意义。
Daqishan lead-zinc(silver) deposit is the first continental volcanic hydrothermal Lead-zinc polymetallic deposit found in Gansu Province, located in the territory of Daqishan in the south of Beishan, Gansu Province. The output of the deposit is controlled by the Dongdaquan-Jinchanggou fault and the Hongliuyuan-Daqishan-Zhangfushan deep fault in the area, which is located at the confluence of regional faults and volcanic structures(volcanic structural depressions). The ore area is initially delineated 3 pieces of lead-zinc ore body,the orebody length is 1 196 m～2 500 m, the thickness is 1. 48 m～10. 01 m, the Pb + Zn is distributed between0. 536% ～12. 996%, the symbiotic silver, copper and tin, and silver is up to 800 × 10-6. Comprehensive mineralization geological background, geological characteristics, mineral distribution, ore-controlling factors and regional geochemical characteristics, We confirm that this area has the potential to form a large continental volcanic hydrothermal endogenous metallogenic deposit. Increasing comprehensive research and regional prospecting efforts is expected to obtain a breakthrough in prospecting. This prospecting discovery has important guidance and reference significance for finding Lead-zinc polymetallic ore and continental volcanic hydrothermal endogenous metal deposits in this area.
Daqishan lead-zinc(silver) deposit is the first continental volcanic hydrothermal Lead-zinc polymetallic deposit found in Gansu Province, located in the territory of Daqishan in the south of Beishan, Gansu Province. The output of the deposit is controlled by the Dongdaquan-Jinchanggou fault and the Hongliuyuan-Daqishan-Zhangfushan deep fault in the area, which is located at the confluence of regional faults and volcanic structures(volcanic structural depressions). The ore area is initially delineated 3 pieces of lead-zinc ore body,the orebody length is 1 196 m～2 500 m, the thickness is 1. 48 m～10. 01 m, the Pb + Zn is distributed between0. 536% ～12. 996%, the symbiotic silver, copper and tin, and silver is up to 800 × 10-6. Comprehensive mineralization geological background, geological characteristics, mineral distribution, ore-controlling factors and regional geochemical characteristics, We confirm that this area has the potential to form a large continental volcanic hydrothermal endogenous metallogenic deposit. Increasing comprehensive research and regional prospecting efforts is expected to obtain a breakthrough in prospecting. This prospecting discovery has important guidance and reference significance for finding Lead-zinc polymetallic ore and continental volcanic hydrothermal endogenous metal deposits in this area.
引文
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[3]Simmons S F.Hydrothermal Minerals and Precious Metals in the Broadlands-Ohaaki Geothermal System:Implications for Understanding Low-Sulfidation Epithermal Environments[J].Economic Geology,2000,95(5):971-999
[4]叶天竺,韦昌山,王玉往,等.矿区找矿预测理论与方法(各论)[M].北京:地质出版社:2017:1-62
[5]张新虎,刘建宏,梁明宏,等.甘肃省区域成矿及找矿[M].北京:地质出版社,2013
[6]孙矿生,彭德启.甘肃省铅锌矿成矿类型及找矿方向[J].地质与勘探,2005,41(1):22-27
[7]聂凤军.北山地区金属矿床成矿规律及找矿方向[M].北京:地质出版社,2002
[8]郑有业,刘敏院,孙祥,等.西藏扎西康锑多金属矿床类型、发现过程及意义[J].地球科学(中国地质大学学报),2012,37(5):1003-1014
[9]刘崇民,马生明,胡树起.金属矿床原生晕勘查指标[J].物探与探化,2010,34(6):765-771
[10]马芳,蒋少涌.与陆相火山岩有关的铁、铜、金矿床成矿地质特征及矿床成因[J].地质找矿论丛,2005,20(4):233-241
[11]蒋敬业,程建萍,祁士华,等.应用地球化学[M].武汉:中国地质大学出版社:2006:1-180
[12]张新虎,刘建宏,赵彦庆.甘肃省成矿区(带)研究[J].甘肃地质,2008(2):1-8
(1)甘肃省地质局第一区域地质测量队. 1∶20万安北幅区域地质矿产调查报告,1966
(2)甘肃省地质矿产局遥感地质中心.1∶5万垒墩泉幅区域地质矿产调查报告,1992