CAJ | 학술논문

宝音图钼矿床是近几年在内蒙古西部地区发现的大型斑岩型钼矿床。重点研究该钼矿床成矿花岗岩稀土元素地球化学特征，探讨花岗岩成因。通过对稀土元素配分模式和特征值（∑REE-LREE/HREE、δEu-LREE/HREE相关性）的分析，对比幔源岩浆及南岭花岗岩稀土元素组成特点，结合岩石化学组成，推断宝音图成矿花岗岩属于陆壳熔融成因花岗岩。由斜长花岗岩→二长花岗岩→钾长花岗岩→细晶花岗岩，岩体成分逐渐变化。岩浆演化中有成分分异，有利于成矿，特别是晚期钾长花岗岩富集成矿元素和矿化剂元素。
보음도목광상시근궤년재내몽고서부지구발현적대형반암형목광상。중점연구해목광상성광화강암희토원소지구화학특정，탐토화강암성인。통과대희토원소배분모식화특정치（∑REE-LREE/HREE、δEu-LREE/HREE상관성）적분석，대비만원암장급남령화강암희토원소조성특점，결합암석화학조성，추단보음도성광화강암속우륙각용융성인화강암。유사장화강암→이장화강암→갑장화강암→세정화강암，암체성분축점변화。암장연화중유성분분이，유리우성광，특별시만기갑장화강암부집성광원소화광화제원소。
The Baoyintu molybdenum deposit,located in western Inner Mongolia,is a large scale porphyry mo-lybdenum deposit which is discovered in recent years.This paper focuses on discussing REE geochemistry of ore-forming granites and genesis of granites.Based on analyses of REE distribution patterns,characteristic value (including ∑REE -LREE/HREE and δEu -LREE/HREE )and petrochemical compositions,comparisons with REE compositions of mantle-derived magma and Nanling granites,authors deduce that genesis of ore-form-ing granites is related to melting of the continental crust.The compositions of granites vary in the sequence of plagiogranite→monzoniticgranite →K-feldspar granite →graniteaplite. The chemical variation during the magmatic evolution process is in favour of mineralization,especially the late-stage K-feldspar granites.