CAJ | 학술논문

蒙西斑岩铜钼矿含矿斑岩体主要为斜长花岗斑岩。通过对含矿斑岩体地球化学和Sr-Nd-Pb同位素特征的研究，确立斑岩体为过铝质钙碱性系列岩石，富集Rb，Ba，U，K，Pb，Sr等大离子亲石元素，亏损Th，Ta，Nb，Nd，Ti等高场强元素；具低的(87Sr/86Sr)ⅰ值（0.70465~0.70537）和相对较高的εNd(t)值（-2.2~6.6），且有较低的初始铅同位素比值（206Pb/204Pb）i=17.13~17.33，（207Pb/204Pb）i=15.47~15.54，（208Pb/204Pb）i=37.11~37.33。上述特征表明其形成于岛弧环境，岩浆物质来源以幔源为主，但也有少量壳源组分参与，岩浆的形成可能与洋壳的俯冲作用有关。东准噶尔琼河坝地区是形成和寻找斑岩型铜矿的有利地区。
몽서반암동목광함광반암체주요위사장화강반암。통과대함광반암체지구화학화Sr-Nd-Pb동위소특정적연구，학립반암체위과려질개감성계렬암석，부집Rb，Ba，U，K，Pb，Sr등대리자친석원소，우손Th，Ta，Nb，Nd，Ti등고장강원소；구저적(87Sr/86Sr)ⅰ치（0.70465~0.70537）화상대교고적εNd(t)치（-2.2~6.6），차유교저적초시연동위소비치（206Pb/204Pb）i=17.13~17.33，（207Pb/204Pb）i=15.47~15.54，（208Pb/204Pb）i=37.11~37.33。상술특정표명기형성우도호배경，암장물질래원이만원위주，단야유소량각원조분삼여，암장적형성가능여양각적부충작용유관。동준갈이경하패지구시형성화심조반암형동광적유리지구。
Ore-bearing porphyry in Mengxi porphyry Copper-Molybdenum deposit is plagiogranite porphyry.The geo-chemical and Sr-Nd-Pb isotope research of porphyry bodies show that rocks are peraluminous calc-alkaline,enriched in large-ion lithophile elements Rb,Ba,U,K,Pb,Sr and depleted in high field strength elements Th,Ta,Nb,Nd,Ti.Through the studies on porphyry bodies,it is identified for rock bodies characterized with low (87Sr/86Sr) ⅰ ratio (0.7046 5~0.7053 7) and high εNd(t) value (-2.2~6.6).(206Pb/204Pb)i ratio of the rock bodies range from 17.13 to 17.33,(207Pb/204Pb)i ratio from 15.47 to 15.54,and (208Pb/204Pb)i ratio from 37.11 to 37.33.These characteristics indicate that the porphyry bodies possibly formed in arc environment, and the magmatic materials were derived from the mantle,involved some portions of crustal rocks,which may related with partial melting of subducted oceanic crust.Qiongheba in eastern Junggar is a potential area for prospecting the phyry Cu deposit.