本文選題：播卡鈉長巖 + 巖相學(xué)�。� 參考：《地質(zhì)通報(bào)》2017年08期

【摘要】：播卡金礦床位于滇中元古代銅金多金屬成礦帶之東川礦集區(qū)。重點(diǎn)報(bào)道了區(qū)內(nèi)與成礦密切相關(guān)的鈉長巖的巖相學(xué)、巖石地球化學(xué)及同位素特征。研究表明,播卡鈉長巖的主要造巖礦物有鈉長石、輝石、黑云母,主量元素特征顯示其為富堿、高鈉、偏鋁質(zhì)的堿性-過堿性巖石。巖石的稀土元素總量低,相對(duì)富集輕稀土元素,明顯富集大離子親石元素K、Rb、Nd及輕稀土元素La、Ce、Sm,相對(duì)虧損高場強(qiáng)元素Nb、Ta、U、Th等。巖石的I_(sr)值、ε_(tái)(Nd)(t)值顯示,其可能為中元古代晚期會(huì)理—東川一帶大陸裂谷巖漿作用的產(chǎn)物,來源于深部地幔,可能有部分陸殼物質(zhì)的參與。
[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.
【作者單位】： 江蘇省有色金屬華東地質(zhì)勘查局;福建金東礦業(yè)股份有限公司;
【基金】：國家自然科學(xué)基金項(xiàng)目《云南播卡晚元古代巖漿作用與成礦效應(yīng):一種可能的IOCG模式》(批準(zhǔn)號(hào):41402077)
【分類號(hào)】：P618.51

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本文編號(hào)：1898713