莱历斯高尔钼铜多金属矿田地质特征及找矿方向

GEOLOGICAL CHARACTERISTIC AND MINERAL EXPLORATION POTENTIAL OF LAILISIGAOER MO-CU POLYMETALLIC ORE FIELD

莱历斯高尔钼铜多金属矿田位于博罗科努古生代复合岛弧带,形成以早石炭世中酸性浅成小岩体为成矿母岩的莱历斯高尔斑岩型钼矿和外围与燕山期岩浆活动有关的3571中低温热液型铜矿床、七兴岩浆热液型多金属矿床.通过对矿田3个矿床成矿地质背景、物化探特征、矿化特点和矿床成因的研究和分析,认为矿田含矿斑岩体形成于相对高温、高fO2、无水、压力相对较高的封闭环境.成岩物质主要来源于地壳,受来自地幔物质混染.矿床硫源主要来自深部地壳原生岩浆或上地幔,铅源主要来自深部地壳,成矿热液为原始岩浆水和大气降水的混合,成矿温度为中低-中高温.应在矿田深部和外围加强早石炭世和燕山期斑岩-矽卡岩-岩浆热液型铜钼多金属矿的"缺位"寻找.

The Lailisigaoer Mo-Cu-polymetallic ore field lies in Bolohuolo Palaeozoic island arc.There are 3 deposits distributed in the ore field：Lailisigaoer porphyry molybdenum deposit with which＇s mother rock is neutral-acidity magma intrusive formed in early Carboniferous.Qixing polymetallic magma-mesothermal fluid deposit and 3571 mesothermal-epithermal fluid copper deposit which formed with the magma intrution in Yanshan Epoch on the outer circle of Lailisigaoer porphyry-molybdenum deposit.By studying the geology background,geophysical and geochemical characteristic,mineralization characteristics and metallogenesis of the 3 deposi-ts above,we draw the conclusion that there is a closed mineralization environment of relativ-e high temperature,high fO2,anhydrous,high pressure.The mag-ma comes from crust and mixed with material of mental.S comes from magma of deep crust or upper mental.Pb comes from the deep crust.The mineralized hydrothermal fluid is mixed by primitive magmatic fluid and Atmospheric water with low-middile temperature.There is a good potential in mineral exploration of porphyry-skarn-magma hydrothermal Mo-Cu-polymetallic deposit in early Carboniferousor or Yanshan Epoch which not yet explored.