四川拉拉IOCG矿床围岩及矿石REE地球化学特征

发布时间：2018-10-08 14:49

【摘要】：四川拉拉Fe-Cu-Mo-Au-REE多金属矿床位于扬子板块西南缘,康滇地轴中段,是我国西南地区典型的铁氧化物-铜-金(IOCG)矿床。通过对矿床围岩及变质热液成矿期矿石中稀土元素(REE)的研究,探讨了成矿物质来源及变质岩原岩性质。结果表明,围岩Eu正异常是受到物源区部分熔融过程中斜长石堆晶加入的影响,矿石Eu正异常为继承围岩,因含火山成因磷灰石,故部分表现为Eu负异常。富F-变质热液交代围岩,将REE活化迁移随矿石一起沉淀,导致矿石REE总量高于围岩,结合围岩与矿石相似的REE配分模式,得出成矿物质源于围岩。钠长变粒岩原岩为火山岩;黑云母片岩原岩中既有火山岩也有部分沉积物的混入,可能经历了与海底热水系统沉积物类似的形成过程。
[Abstract]:The Lala Fe-Cu-Mo-Au-REE polymetallic deposit in Sichuan is located in the southwest margin of the Yangtze plate and the middle section of the Kangdian axis. It is a typical iron oxide-copper-gold (IOCG) deposit in southwest China. The source of ore-forming material and the properties of metamorphic rocks are discussed by studying the (REE) of rare earth elements in the surrounding rock and metamorphic hydrothermal ore forming period. The results show that the positive Eu anomaly of surrounding rock is affected by the addition of plagioclase heaps in the partial melting process of the provenance region, and the positive anomaly of ore Eu is inherited surrounding rock, which is partly characterized by negative Eu anomaly due to volcanogenic apatite. F- metamorphic hydrothermal metasomatism of the surrounding rock, REE activation migration with the ore precipitation, resulting in the total amount of ore REE is higher than the surrounding rock, combined with the surrounding rock similar to the REE distribution model, it is concluded that the ore-forming material originated from the surrounding rock. The source rocks of sodium feldspar granulites are volcanic rocks, and the biotite schist rocks are mixed with volcanic rocks and some sediments, which may have experienced a process similar to that of submarine hydrothermal system sediments.
【作者单位】：成都理工大学地球科学学院;
【基金】：国家自然科学基金项目(41072065) 教育部博士点基金项目(20105122110001) 中国地质调查局项目(12120113095500)
【分类号】：P618.2

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