投稿时间：2015-03-26
修订日期：2016-01-31
网络发布日期：2016-06-30
中文摘要: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。
Abstract: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 factors 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 brecciated areas are more favorable for mineralization. Thus the exploration for concealed orebodies should target the largest and most intense deep dilation zones.
keywords:geology dilation deformation structure controlling mechanism of ore formation fractal statistics deep-ore exploration Makeng iron ore deposit
文章编号：
中图分类号：P618.51
文献标志码：
基金项目:本文得到中国地质调查局地质调查(编号:12120113089600、12120114028701)项目资助
引用文本：
高孝巧,张达,冯海滨,潘天望,王森,易锦俊.2016.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[J].矿床地质,35(3):605~617GAO XiaoQiao,ZHANG Da,FENG HaiBin,PAN TianWang,WANG Sen,YI JinJun.2016.Ore controlling mechanism of dilation deformation structure of Makeng skarn iron deposit in southwestern Fujian Province and its significance for deep-ore exploration[J].Mineral Deposits35(3):605~617
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