云南播卡金矿区钠长岩地球化学特征及其地质意义

发布时间：2018-05-16 22:32

本文选题：播卡钠长岩 + 岩相学　；参考：《地质通报》2017年08期

【摘要】：播卡金矿床位于滇中元古代铜金多金属成矿带之东川矿集区。重点报道了区内与成矿密切相关的钠长岩的岩相学、岩石地球化学及同位素特征。研究表明,播卡钠长岩的主要造岩矿物有钠长石、辉石、黑云母,主量元素特征显示其为富碱、高钠、偏铝质的碱性-过碱性岩石。岩石的稀土元素总量低,相对富集轻稀土元素,明显富集大离子亲石元素K、Rb、Nd及轻稀土元素La、Ce、Sm,相对亏损高场强元素Nb、Ta、U、Th等。岩石的I_(sr)值、ε_(Nd)(t)值显示,其可能为中元古代晚期会理—东川一带大陆裂谷岩浆作用的产物,来源于深部地幔,可能有部分陆壳物质的参与。
[Abstract]:The Baka gold deposit is located in Dongchuan ore concentration area of Proterozoic copper and gold polymetallic metallogenic belt in central Yunnan. The lithofacies, geochemistry and isotopic characteristics of sodium feldspar, which are closely related to metallogenesis, are mainly reported in this paper. The results show that the main rock-forming minerals of Yaka sodium feldspar are albite, pyroxene and biotite. The main element characteristics show that they are alkaline, high sodium, and metaluminous alkaline-peralkaline rocks. The total amount of rare earth elements in the rocks is low, they are relatively enriched in light rare earth elements, the large ion lipophilic elements K _ (Rb) ND and the light rare earth elements La _ Ce ~ (2 +) Smand, and the relative depletion of high field strength elements, such as NB ~ (3 +) ~ (-) UTh, etc. The value of I _ S _ r and 蔚 _ D _ D _ (r) of rocks indicate that it may be the product of the continental rift magmatism in the late Middle Proterozoic period in Huilian-Dongchuan area, originated from the deep mantle, and may involve some continental crust materials.
【作者单位】：江苏省有色金属华东地质勘查局;福建金东矿业股份有限公司;
【基金】：国家自然科学基金项目《云南播卡晚元古代岩浆作用与成矿效应:一种可能的IOCG模式》(批准号:41402077)
【分类号】：P618.51

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