豫西矿集区幔枝构造约束下的小岩体成大矿  

Mantle branch structure constraint on the large ore deposit-hosted small intrusions in the West Henan province

作　　者：张灯堂[1] 牛树银[2] 孙爱群[2] 何进[1] 赵瑞[1] 姚淑玲[1] 刘宗彦[1] 崔燮祥[1] 

机构地区：[1]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023 [2]石家庄经济学院资源学院,石家庄050031

出　　处：《地质找矿论丛》2015年第4期515-522,共8页Contributions to Geology and Mineral Resources Research

基　　金：河南省国土资源厅2013年地质科研项目(编号:2013-16);三门峡市地质与矿产调查项目联合资助

摘　　要：文章通过分析豫西地区的大量地质矿产资料后发现,区内存在"小岩体成大矿"的规律。认为豫西地区自燕山期以来,随着地幔热柱的演化,区内地壳运动转为伸展活动,地壳减薄、地幔不均衡上隆和中酸性岩浆脉动式上侵;中酸性岩浆脉动式上侵过程打通了深部成矿物质上升的通道,使得含矿流体能够到达地壳上部,并在幔枝构造外围主次级拆离带、岩体内外接触带、构造裂隙等适宜部位集聚成矿。Analysis of large volume of geological data of the west Henan province shows the law of＂small intrusions host large ore deposit＂.Since Yanshanian period extensional structure took place in the area with evolution of the mantle plume resulting in thinning of the crust and mantle imbalance uplifting and pulse upwelling of intermediate acid magma.Upwelling of the magma open channel for moving up of the deep ore material and the ore fluid gets to upper part of the crust and accumulates to be ore at suitable places in surroundings of the mantle branch,such as detachment zone and sub-detachment zone,inner and outer contact zones of intrusions and tectonic cracks or fractures.

关 键 词：幔枝构造 成矿作用 控矿构造 小岩体成大矿 豫西地区 

分 类 号：P611.11[天文地球—矿床学] P618.2[天文地球—地质学]