摘要
桐柏老湾金矿为韧性剪切带内构造-变质作用形成的典型金矿床,赋存于信阳群龟山组中,其原岩为中-基性熔岩夹少量凝灰岩。岩浆活动频繁,构造运动强烈,使岩层多次发生强烈变质、变形,龟山组地层含金组分被激发活化,加之多期次叠加,使金更加富集成矿。含金矿体在氧化带上部继续遭受表生作用,风化剥蚀,又进行了第二次次生富集过程。老湾金矿矿化主要有两种:硅化脉型金矿和黄铁绢英岩化碎裂岩型金矿,以硅化脉型为主,而且在深部金多呈似层状产出,表示出上"脉"下"层"的特点。
Tongbai Laowan gold deposit is structure-metamorphism formed typical gold deposit within a ductile shear zone,occurrence in xinyang group of guishan formation,its original rock is Neutral-Basic lava with a small amount of tuff, frequent magmatic activities. Strong tectonic movement,the rock strong metamorphism and deformation in many times,guishan formation gold bearing components are activated,combined with the overlay issue,make more enrichment of gold. Gold ore bodies continue to suffer on the upper oxidized zone table function,weathering denudation,and a second secondary enrichment process. Laowan gold deposit, there are two main types of gold mineralization： silicide vein type gold Laowan gold deposit deposit and beresitization cataclastic rock type gold deposit,with silicification vein type is given priority to, and in deep gold in layered output,more show on the characteristics of the“pulse”down“layer”.
出处
《化工矿产地质》
CAS
2014年第1期13-23,共11页
Geology of Chemical Minerals
关键词
金矿
桐柏老湾
构造-变质作用
次生富集
gold deposite
Tongbai Laowan gold deposit
Structure-metamorphism
Secondary enrichment
