摘要
陈家杖子金矿是近年来在华北板块北缘、内蒙地轴东段新发现的浅成低温热液隐爆角砾岩型金矿床,其赋矿围岩为侵位于太古界建平群老变质岩系与燕山早期花岗岩中的超浅成酸性隐爆角砾岩体,角砾岩体从中心向外侧有较显著的岩石类型分带,中心部位为隐爆含角砾晶屑岩屑凝灰岩,向外角砾增大,逐渐过渡为震碎角砾岩。角砾岩蚀变强烈,主要为强烈绢英岩化和碳酸盐化,其次为硅化、冰长石化、泥化和青磐岩化,并有明显的蚀变分带现象。金矿体呈脉状,产于角砾岩体的中西部,金矿物主要以裂隙金和粒间金形式存在。燕山期酸性隐爆角砾岩、硅化、冰长石化、绢云母化蚀变,Au、Ag、Cu、Pb、Zn、Bi、As化探异常等为金矿主要找矿标志。
The Chenjiazhangzhi gold deposit is an epithermal cryptoexplosive breccia-type gold deposit discovered newly at the north margin of the Northern China plate and in the eastern segment of the Inner Mongolia axis. The deposit is hosted in a near-surface intruded into Archean metamorphic series of the Jianping Group and early Yanshanian granite. From the center outward the cryptoexplosive breccia pipe shows apparent zoning of rock types: the central part is cryptoexplosive clast-bearing crystal and lithic tuff, and outward clasts increase in size and the rock gradually grades into shatter breccia. The breccia has been intensely altered and shows pronounced alteration zoning. The alteration includes mainly sericite-quartz alteration and carbonation and subordinately silicification, adularization, argillization and propylitization. The gold bodies occur as veins in the west-central part of the breccia pipe. gold minerals are mainly present in fissure gold and intercrystalline gold. Yanshanian acid cryptoexplosive breccia pipe, silicification, adularization and sericitization, and Au, Ag, Cu, Pb, Zn, Bi and As anomalies are main indicators of gold prospecting.
出处
《中国地质》
CAS
CSCD
2004年第2期206-212,共7页
Geology in China
基金
国家资源补偿费项目(Nd02002)资助。
关键词
内蒙古
隐爆角砾岩
金矿床
地质特征
找矿方向
找矿标志
cryptoexplosive breccia pipe
gold deposit
geological characteristics
direction in mineral prospecting
Chenjiazhangzi
Inner Mongolia
