河南栾川东鱼库钼(钨)矿床地质特征及找矿标志

Geological characters and prospecting indicators of Mo(W) deposit in Dongyuku,Luanchuan,Henan province

河南栾川东鱼库钼(钨)矿床是东秦岭—大别山钼成矿带新发现双大型矿床。该钼(钨)矿床空间分布受晚侏罗世花岗斑岩体控制,矿体赋存于东鱼库—竹园沟二长花岗岩复式岩体内外接触带——三川组及南泥湖组岩石经接触交代变质形成的矽卡岩和长英质角岩中,呈层状、似层状分布。长1400m,宽200～800m。钼矿体厚10.30～244.35m,平均57.99m。平均品位w(Mo)为0.07%,钨矿体厚13.30～190.23m,平均65.18m,w(WO3)为0.14%。通过对矿床矿化、蚀变分析认为矿床属于斑岩—矽卡岩型,燕山期花岗斑岩为成矿母岩。总结了东鱼库钼(钨)矿床找矿标志。

The Dongyuku Mo（W） deposit is a double large-type deposit, newly-found in Mo ore-forming zone of the East Qinling-Dabie Mountain. The Mo（W） deposit distribution was controlled by the late Jurassic granite-porphyry,the orebody occurs in the inner and outer contact zones of Dongyuku and Zhuyuangou monzonitic granite duplex mass,and in the skarn and felsic hornstone that rocks of Sanchuan formation and Nannihu formation underwent contact metasomatic metamorphism, and distributed as stratfied or stratfied-like layer. The orebodies are 1400m in length and 200-800m in width and the molybdenum orebody is 10.30- 244.35m thick with average thickness of 57.99m while tungsten orebody is 10. 30-190. 23m thick with average thickness of 65.18m and the average w（Mo） grade is 0.07% ,while w（WO3） is 0.14%. The deposit was regarded as porphyry-skarn type by analying mineralization and alteration,and the granite-porphyry of Yanshanian period was the hostrock,while prospecting indicators of the Dongyuku Mo（W） deposit were summa- rized.