Abstract
内蒙古乌努(奴)格吐山铜铅锌矿整装勘查区位于得尔布干成矿带西南段，是我国北方重要的Cu-Mo-Fe-Au-Ag-Pb-Zn成矿带。近年来随着多接收电感耦合等离子体质谱(MC-ICP-MS)的广泛应用，使Mo、Cu、Fe、Zn等同位素的研究应用于矿床学研究中。本文通过对乌努格吐山斑岩型矿床黄铜矿Cu同位素、辉钼矿Mo同位素组成，绢云母Ar-Ar年龄进行研究，借此探讨该矿床的形成时代、矿床成因。结果显示，矿床成矿早阶段的绢云母坪年龄为181.9±1.1Ma，等时线年龄为181.0±2.3Ma，与辉钼矿Re-Os等时线年龄相一致。而石英+钾长石+辉钼矿+黄铜矿+黄铁矿脉中和石英+黄铜矿+黄铁矿脉中黄铜矿的δ65Cu平均值分别为0.31‰和0.40‰，显示黄铜矿的δ65Cu值从早到晚逐渐增高，这可能为流体出溶过程中63Cu优先进入富气相流体，残余岩浆流体逐渐富集65Cu的结果。辉钼矿的δ98Mo/δ95Mo介于-0.16‰~0.35‰之间，说明在成矿作用的过程中Mo进入不同的矿物组合中并发生了同位素分馏，可能受到了氧化还原条件、温度等物理化学条件的变化，或者是辉钼矿的多型特征的影响。得尔布干成矿带矿床的形成与蒙古鄂霍次克洋的演化密切相关，结合前人研究成果，将成矿带斑岩型矿床分为240~230Ma、180~200Ma、150~160Ma三期。
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