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肖晓牛,余新明,肖娥,徐强,林志奎,林迎洁.云南播卡金矿区钠长岩地球化学特征及其地质意义[J].地质通报,2017,(8):1417-1427.
云南播卡金矿区钠长岩地球化学特征及其地质意义    点此下载全文
肖晓牛1  2  余新明1  2  肖娥1  徐强1  林志奎1  林迎洁1
1. 江苏省有色金属华东地质勘查局, 江苏 南京 210007;
2. 福建金东矿业股份有限公司, 福建 三明 365101
基金项目: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)
DOI:
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Isr值、εNdt)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。
关键词:播卡钠长岩  岩相学  地球化学  富集地幔  云南
Geochemical characteristics and geological significance of the albitite in the Boka gold ore district, Yunnan Province    Download Fulltext
XIAO Xiaoniu1  2  YU Xinming1  2  XIAO E1  XU Qiang1  LIN Zhikui1  LIN Yingjie1
1. East China Mineral Exploration and Development Bureau for Nonferrous Metals, Nanjing 210007, Jiangsu, China;
2. Fujian Jindong Mining Co., Ltd., Sanming 365101, Fujian, China
Fund Project:
Abstract:
      The Boka gold deposit is located in the Dongchuan ore concentration area, and belongs to Yunnan Proterozoic copper polymetallic mineralization belt. This paper reports the petrography, geochemistry and isotope features of albitite that is closely related to mineralization. Studies show that the mineral compositions of albitite are albite, pyroxene, biotite, and the major element characteris-tics indicate a high Na, alkali-enriched, metaluminous, alkaline-peralkaline rock. This albitite is characterized by low ΣREE, strong enrichment of LILE(K, Rb, Nd)and LREE(La, Ce, Sm), and depletion of HFSE elements(Nb,Ta,U,Th). Based on Isr, εNd(t)isoto-pic geochemistry, it is suggested that Boka albitite was produced by magmatism of Middle Proterzoic continent rift in Huili-Dongch-uan area, and it was derived from the deep mantle with the addition of some crustal materials in the magma source region.
Keywords:Boka albitite  petrography  geochemistry  enriched mantle  Yunnan Province
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