摘要
隐爆角砾岩是岩浆在近地表处隐蔽爆破所形成的一套岩石类型组合,常以隐爆角砾岩筒的形式产出,其孔隙率高,为含矿热液提供了良好的通道及容矿场所,隐爆角砾岩型矿是金、铜、钨、铀等矿产的一种重要类型。隐爆角砾岩的成岩作用常伴随着热液蚀变作用,成矿作用发生在岩体内部及其围岩接触带。通过对隐爆角砾岩的国内外研究现状、隐爆角砾岩及岩筒的一般特征、岩筒的形成模式、成因机制与演化过程、成矿规律和矿床特征进行归纳、总结、隐爆角砾岩型矿床的形成需要复杂的区域构造和活跃的构造运动,作为重要的控矿构造,区内发育有一条或多条深大断裂及次级断裂是必不可少的;空间分布广且多与火山活动密切相关;成矿年龄跨度大,多集中在燕山期;以热液蚀变为主的矿化作用,形成多种伴生组分,常出现一体多矿现象。
The cryptoexplosive breccia is a set of rock types formed by the hidden blasting procedure of magma near the surface.It is often produced in the form of cryptoexplosive breccia tube,which has a high porosity and might provide for ore-bearing hydrothermal fluid.This type mineralization related to cryptoexplosive breccia tube is an important type of mineral resources such as gold,copper,tungsten and uranium deposits.The diagenesis is often accompanied by hydrothermal alteration and mineralization hosted in the interior of the rock mass and its surrounding rock contact zone.This paper has summarized the research of cryptoexplosive breccia in China and abroad,the general characteristics and formation model of cryptoexplosive breccia tube,the genetic mechanism and evolution process,the metallogenic regularity and relative mineralization characteristics.It is found out that the deposits of cryptoexplosive breccia type are located at the complex regional structural setting and in the active tectonic movement region.As an important ore-controlling structural condition,there are one or some deep and large faults and secondary fractured zones in the area,the deposit spatial distribution is widely and extensively related to the volcanic activity with a long mineralization range age,which is mostly concentrated in the Yanshanian period.The hydrothermal mineralization is dominant to form a variety of associated mineral resources,and the phenomenon of integrated multi-mineral resources of one orebody often occurs.
作者
蒋禺恒
刘战庆
崔丰智
岑炬标
李瑞霜
席昊
JIANG Yuheng;LIU Zhanqing;CUI Fengzhi;CEN Jubiao;LI Ruishuang;XI Hao(College of Earth Sciences,Guilin University of Technology,Guilin 541006,Guangxi,China)
出处
《矿产与地质》
2019年第6期1009-1015,1025,共8页
Mineral Resources and Geology
基金
中国地质科学院中国矿产地质与成矿规律综合集成和服务(DD20160346)子课题“南岭成矿带西段成矿规律总结项目”
广西隐伏金属矿产勘查重点实验室系统研究课题“钦杭成矿带铜多金属矿的矿田构造研究及成矿预测”(13-A-01-04)共同资助。
关键词
隐爆角砾岩
岩筒模式
成岩机制
成矿规律
矿床特征
cryptoexplosive breccia
rock tube model
diagenesis mechanism
metallogenic regularity
deposit characteristics
