闽西南马坑矽卡岩型铁矿床扩容构造控矿机制及深部找矿意义  

Ore controlling mechanism of dilation deformation structure of Makeng skarn iron deposit in southwestern Fujian Province and its significance for deep_ore exploration

作　　者：高孝巧[1] 张达[1] 冯海滨 潘天望 王森[1] 易锦俊[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中地海外集团有限公司,北京100101

出　　处：《矿床地质》2016年第3期605-617,共13页Mineral Deposits

基　　金：中国地质调查局地质调查(编号:12120113089600;12120114028701)项目资助

摘　　要：文章基于岩石力学及分形统计分析,结合野外地质调查,探讨了扩容构造控矿机制及其在福建马坑铁矿床成矿过程中的作用。指出马坑铁矿床成矿过程与构造变形作用造成的扩容机制密切相关,其中,锯齿状断裂扩容构造及流体超压作用扩容是马坑铁矿床除接触交代作用外成矿的关键因素。锯齿状断裂扩容构造形成于伸展剪切作用,造成矿体沿倾向的尖灭再现。成矿流体超压扩容主要是由于流体沸腾作用引起,使岩石发生角砾岩化,其中大规模角砾岩是矿体的有利赋存部位。福建马坑矿区深部及外围找矿,应重点关注大规模高强度的汇流扩容区。The role of dilation deformation in controlling the ore-forming process of the Makeng iron deposit in Fujian Province is discussed based on field observation, theory of rock mechanics and fractal statistics. The authors hold that tectonic deformations played a major role in formation of the Makeng orebody, where the fluid overpressure which triggered the dilation deformation and the resultant undulating fractures seem to have been the main fac- tors that converted the Makeng orebody into structurally controlled sites, besides contact metasomatism. The undulating fractures were induced by extensional tectonics, which had also caused some shearing and made the ore bodies exhibit a pinch-out appearance. Abundance of brecciated zones indicates fluid overpressure which was mainly induced by boiling fluids. Generally, the highly hrecciated areas are more favorable for mineralization. Thus the exploration for concealed orebodies should target the largest and most intense deep dilation zones.

关 键 词：地质学 扩容构造 控矿机制 分形统计 深部找矿 马坑铁矿床 

分 类 号：P618.51[天文地球—矿床学]