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德兴银山铜铅锌矿地质特征与深部勘查评价
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摘要
江西德兴银山铜铅锌矿床是一个与燕山期中酸性陆相火山-次火山作用有关的热液型铜铅锌多金属矿床。本文总结了德兴银山铜铅锌矿床的成矿地质背景和控矿因素,在开展矿区深部资源勘查评价工作的基础上,详细研究了九区和北山区矿体的深部矿床地质特征,并探讨了矿床成因,得到如下认识及成果:
     1、在1:20万和1:5万地质调查和研究资料的基础上,划分研究区构造单元,总结了研究区的构造演化历史。四堡期南、北扬子板块之间发生碰撞拼接在一起,晋宁期扬子板块和华夏板块于江绍断裂带(绍兴-十万大山一带)碰撞,Gilder et al.(1996)提出从杭州经江西、湖南至十万大山存在一个低tDM和高εNd花岗岩带(即十杭裂谷带),推断为中生代裂谷带。银山矿床位于十杭裂谷带北侧。
     2、通过地质资料分析,孔家-银山火山盆地在1:20万、1:5万填图时被划为上侏罗统鹅湖岭组,证据是不充分的。本文获得银山与火山岩伴生的次火山岩锆石LA-ICP-MS U-Pb年龄为180Ma±,确定孔家-银山火山岩盆地为早侏罗世产物,与区域上上侏罗统鹅湖岭组不属于同一层位。该盆地是华南目前发现的在该时期唯一成矿的火山岩盆地。
     3、进一步研究了矿区火山岩-次火山岩的含矿性及控矿因素,对蚀变-矿化分带和成矿类型有了进一步的认识。
     4、大致查明了北山区和九区深部矿体的条数、规模、形态、产状,矿石矿物和脉石矿物的种类、含量、共生组合及矿石组构特征。对比分析研究了深部矿石有益有害组分的种类、含量和分布规律,划分矿石工业类型。对九区铜矿体中共生金进行了试圈,以金品位为0.5g/t圈定铜金矿石类型的可能性作了有益的尝试和探索。
     5、对九区和北山区深部矿体的资源勘查评价,铜金达大型矿床、铅锌银硫达中型矿床。探获的资源量可作为后续详查的依据及矿山远景规划的参考。
Dexing Yinshan copper-lead-zinc deposit is a polymetallic deposit closed to the role of Mesozoic intermediate-acid volcanic-subvolcanic hydrothermal of continental. This paper summarizes the geological background and ore-controlling factors of the deposits, on the basis of carrying out mining exploration and evaluation work of deep resources,with a detailed study of the deep geological features in the Nine districts and the North Mountain ore deposits, and discusses the genesis, knowledge and results obtained are as follows:
     1、Based on the 1:200000 and 1:50000 geological survey and research data, This paper divides the Late Proterozoic tectonic unit, summarizes the history of tectonic evolution of the study area. In Sibao, the southern and northern Yangtze plate collision between each other to spliced together, in Jinning Yangtze Plate and the Chinese plate collisioned in the Jiangshao fault zone (Shaoxing-Shiwan Mountain area), inferred the band (Shi-Hang rift zone)is Mesozoic rift zone. Yinshan deposit's position is at the north side of Shi-Hang rift zone.
     2、Through the analysis of geological data, the Kongjia-Yinshan volcanic basin is designated as the Upper Jurassic Swan Lake Ridge group in the 1:200000 and 1:50000 Geological mapping time, the evidence is not sufficient. get Yinshan associated with volcanic and subvolcanic zircon LA-ICP-MS U-Pb age of about 180Ma to determine kongjia-Yinshan volcanic basin as a product of the early Jurassic, the Upper Jurassic Goose Lake in regional does not belong to the same layer. Currently,this basin is the only mineralization basin discovered during the volcanic basin in South China.
     3、Further study the ore-bearing of volcanic and sub-volcanic rocks and ore-controlling factors of Yinshan, and also have a better understanding of the alteration-mineralization zoning and ore type.
     4、Roughly identified the deep ore bodies by the number, size, shape, occurrence, ore minerals and gangue minerals of the type and content, symbiotic combination and fabric characteristics of the ore of the Nine district and North mountain. Comparative analysis of the harmful components useful in deep ore types, content and distribution, by type of mineral industries. Nine district of the ore body were tried to Delineation of ore body by gold, a gold grade of≥0.5g/t copper and gold ore delineation of the possibility of a useful type of experiment and explore.
     5、According to deep ore exploration and evaluation of resources of the Nine districts and the North Mountain, copper-gold deposit reached to large-scale, Pb-Zn-Ag-S reached to medium-sized deposits.
引文
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