栾川南泥湖钼钨矿田蚀变分带研究和构造岩相填图  

The study of the alteration zonation and the structural alteration mineral mapping in Nannihu Mo-W orefield,Luanchuan

作　　者：王宗永[1] 吕古贤[2] 许谱林 杨人毅[1] 罗毅甜 刘荣霞[4] 薛长军[4] 黄钗弟 杨飞[4] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国地质科学院地质力学研究所,北京100081 [3]核工业二七0研究所,江西南昌330200 [4]长安大学地球科学与资源学院,陕西西安710064

出　　处：《地学前缘》2015年第4期37-45,共9页Earth Science Frontiers

基　　金：河南省2011年度探矿权采矿权使用费和价款支出科研项目(2011-622-5)

摘　　要：豫西整装勘查区的栾川南泥湖钼钨矿田是目前我国最大的生产钼矿山。该区斑岩夕卡岩型钼钨矿床经过广泛系统的地质勘测和地质科研工作。然而,该斑岩夕卡岩型钼钨成矿系列或成矿系统的地质特征在野外如何识别通过什么地质测量方法能够把成矿岩系和它们的栾川群变质围岩区别开不仅是区域地质矿产调查急需解决的问题,也是南泥湖钼钨矿田深部外围找矿的难题。本文研究豫西中生代花岗岩钼钨多金属成矿事件,在斑岩夕卡岩型钼矿床模式的基础上建立成矿地质体的岩石学、矿物学判别标志,开展矿田构造岩相地质填图。通过实测9条构造蚀变分带剖面,在6km2区段内实现1∶1万构造岩相填图。建立接触热蚀变和接触交代蚀变两种类型,确定硅灰石角岩带、石榴子石角岩带和碳酸盐化角岩带,以及夕卡岩带、夕卡岩化带和弱夕卡岩化带,共6个分带。结果发现:南泥湖—三道庄矿区南部接触热变质作用发育,呈环状硅灰石角岩带、石榴子石角岩带和碳酸盐化角岩带;而北部接触交代变质作用呈东西向广泛发育,从东到西依次为夕卡岩带、夕卡岩化带和弱夕卡岩化带。矿区南部围岩以泥质火山岩为主,北部围岩为碳酸盐发育的地层建造,这是影响上述两类蚀变岩分布和发育程度规模的主要原因。本研究对于区域矿产调查给出了新的思路和实际测量填图成果,对于基础地质科研紧密结合地质找矿生产实践提供了示范研究,意义重大。The Nannihu orefield in the integrated exploration area of Western Henan is the largest at present molybdenum mine in China, which is a porphyry-skarn molybdenum deposit, and to which extensive systematic geological studies have been made. But, how to determine in the field the geological characterics of the minerogenetic series or metallogenetic system of the porphyrykarn molybdenum deposit？ And how to distinguish through geological survey the metallogenetic rock series from the metamorphic country rocks of Luanchuan group？ These are the vital issues both in regional geological mineral exploration and in the peripheral prospecting and the exploration of deep-seated deposits in the Nannihu Mo-W orefield. This paper researches the Mesozoic granite ore-forming geological event in Western Henaru Based on the porphyry-skarn molybdenum deposit model, the petrological and mineralogical discriminant criteria of the ore-forming geological body are established. And the structural alteration mineral mapping of the Nannihu orefield has been conducted. On the basis of the 9 structure-alteration-petrofacies sections we established the structure-alteration- petrofacies zonation and completed the structure petrofacies mapping of the 1 ： 10000 Nannihu orefield in the range of 6 square kilometers. We discriminated the contact metamorphism of Nannihu rock into thermal contact metamorphism and hydrothermal metamorphism. According to the temperature typomorphic minerals the thermal contact metamorphism can be subdivided into wollastonite hornfels zone, garnet hornfels zone and carbonate hornfels zone. According to the degree of alteration hydrothermal metamorphism is divided into skarn zone, skarn alteration zone and weak skarn alteration zone. Mapping results revealed the distribution of altered rocks. Thermal contact metamorphic belt developed extensively in the south of Nannihu-Sandaozhuang mine. It shows zonal distribution including wollastonite hornfels zone, garnet hornfels zone and carbonate hornfels zone; obviously it

关 键 词：栾川南泥湖钼矿田 构造岩相填图 接触交代变质 接触热变质 构造蚀变分带 

分 类 号：P613[天文地球—矿床学] P623.3[天文地球—地质学]