新疆索尔库都克铜钼矿床稀土元素地球化学特征及成矿作用示踪

发布时间：2018-07-08 11:19

本文选题：稀土元素 + 矽卡岩　；参考：《大地构造与成矿学》2017年06期

【摘要】：索尔库都克矽卡岩型铜钼矿床位于新疆东准噶尔北缘,矿区发育早、晚两期矽卡岩并分别伴有成矿作用。两期矽卡岩在产出特征、矿物组合及成矿过程方面均有明显区别,其中与早期矽卡岩有关的成矿金属元素为Fe-Cu-Mo组合,与晚期矽卡岩有关的成矿金属元素为Cu-Mo-Zn组合。本文对索尔库都克铜钼矿床的矽卡岩单矿物、安山质围岩、矿石及与成矿有关的脉岩进行了稀土元素测试分析。结果表明早期矽卡岩成矿过程与安山质围岩关系密切,成矿环境经历了由进化变质阶段的弱还原-弱氧化条件→氧化物阶段的弱还原环境→退化变质早阶段氧化环境→退化变质中晚阶段弱氧化-还原环境的变化过程,铁质可能主要来自于围岩;晚期矽卡岩成矿过程中成矿环境经历了由进化变质阶段的氧化环境→退化变质阶段的弱氧化-弱还原环境→石英-硫化物阶段的弱还原-还原环境→石英-方解石阶段还原环境的变化过程。虽然在具体的成矿过程方面有明显的区别,但在早、晚两期矽卡岩各自的主成矿阶段均经历了由氧化环境向还原环境转变的过程,这种转变为大量金属硫化物的形成创造了良好的条件,是导致矿质沉淀的重要机制。
[Abstract]:Solkudouk skarn type copper-molybdenum deposit is located in the northern margin of East Junggar Xinjiang. Skarn was developed early and late in the ore area and accompanied with mineralization respectively. The occurrence characteristics, mineral assemblages and metallogenic processes of skarn in the two periods are obviously different. The ore-forming metal elements related to early skarn are Fe-Cu-Mo assemblage, and those related to late skarn are Cu-Mo-Zn assemblage. In this paper, the rare earth elements of skarn single mineral, Anshan surrounding rock, ore and dike rock related to mineralization of Solkudouk copper molybdenum deposit are tested and analyzed. The results show that the early skarn mineralization process is closely related to the Anshan surrounding rock. The metallogenic environment has undergone the process of degenerative metamorphic early stage oxidation environment degradation middle and late stage weak oxidation-reduction environment from the weak reduction-weak oxidation condition of evolution metamorphic stage. Iron may mainly come from surrounding rock; During the metallogenic process of late skarn, the metallogenic environment experienced a weak oxidation-reduction environment in the degenerative stage of evolution metamorphism, a weak oxidation-weak reduction environment in the quartz-sulphide stage and a quartz-cube solution in the weak reduction-reduction environment at the stage of evolution metamorphism. The changing process of the reduction environment in the stone stage. Although there are obvious differences in the specific metallogenic processes, the main metallogenic stages of skarn in the early and late stages have undergone a process of transition from the oxidation environment to the reduction environment. This transition creates favorable conditions for the formation of a large number of metallic sulphides and is an important mechanism leading to mineral precipitation.
【作者单位】：昆明理工大学国土资源工程学院;北京矿产地质研究院;白银有色集团新疆富蕴县索尔库都克铜矿;中国地质大学(北京)地球科学与资源学院;
【基金】：国家“973”计划项目(2014CB440803) “十二五”国家科技支撑计划重点项目(2011BAB06B03-05) 国家自然科学基金项目(41202064,41702103)联合资助
【分类号】：P618.41;P618.65

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