栾川上房沟特大型钼矿床蚀变分带规律研究

河南栾川上房沟特大型钼矿床位列我国6个世界级特大型钼矿床的第3位。由于其赋矿围岩以变质岩为主，加之矽卡岩较多而复杂。因此，研究赋矿围岩的蚀变分带规律及其与成矿的关系是很有必要的。一般地，工业矿体本身既可赋存于镁质矽卡岩中，也可赋存于碱长花岗斑岩、变辉长岩、花岗岩等不同的岩石类型中，这充分表现出，1）岩体是赋矿或控矿的主要因素，成矿离不开岩体与围岩的接触变质带；2）岩体内部自外向内分带为，较强硅化、钾长石化带和绢云母化带，前两带与成矿关系均较密切；3）围岩蚀变自内向外分带为，金云母透闪石阳起石化带-透闪石阳起石化带-蛇纹石透闪透辉石化带-弱白云石大理岩带，它们可相互叠加。围岩早期蚀变的矿化程度相对较弱，而成矿主要发生于蚀变的中后期-与多金属硫化物矿化有关的、石英-硫化物阶段形成的晚期蚀变，有硅化、钾化、绢英岩化，它们是在岩浆期后热液接触变质和自变质矿物组合的基础上产生的。上房沟特大型钼矿床具面状蚀变、面状矿化、矿体与岩体接触蚀变带形影不离、紧密相伴的地质特征。

STUDY ON THE ALTERATION ZONING LAW OF SHANGFANGGOU HUGE-SIZE MOLYBDENUM ORE DEPOSIT

Shangfanggou huge - size molybdenum ore deposit in Luanchan lies in 3rd place among six world level huge - size molybdenum ore deposit in China. Because of the industrial ore body host country rock mainly with metamorphic rock, besides the more and complex skarn, therefore study on the alteration zoning law and the relation of mine is necessary. Normally, the ore body of ore deposit can host in the magnesian skarn, also host in differences rock type, such as the alkali - feldspar granite - porphyry, meta - gabbro, granite etc. This shows that, 1 ） the rock body is major factor of host - mine or control - mine, ore - forming can not away from the contact metamorphic zone of rock body and country rock; 2 ）the rock body internal zoning from besides to： medium sil cification k - feldsparize belt and sericitize belt, the relation of former two belt and ore -forming is more close; 3 ）the wallrock alteration zoning from outward ： phlogopitization - tremolitization - actinolitization belt, seroentinization - tremolitization - dipsidization belt, weak dolomite - marble belt, them can mutual overlay. The mineralization level relative weak of the wallrock early alteration, oer - forming mainly occur in later stage of alteration, that concer with the polymetallic sulphide, and forming in quartz - sulphide stage, which have sil cification, k - feldsparize, sericite quartzitization , them produced in post -magmatic contact metamorphic and autometamorphic mineral assemblage. The geological characteristics of Shangfanggou huge -size molybdenum ore deposit which is planar alteration, planar mineralization, ore body and rock body contact alteration zone inseparable, close accompany.