【摘要】：對二紅洼鎂鐵-超鎂鐵巖體Cu-Ni硫化物和Fe-Ti氧化物復(fù)合礦化的巖漿作用過程的研究有助于探討CuNi-VTiFe復(fù)合成礦作用的機(jī)制.首先通過對兩個侵入期次不同侵入相的橄欖石進(jìn)行了系統(tǒng)的電子探針分析,其次,對巖漿作用過程的分異演化程度和硫化物熔離程度進(jìn)行了模擬.研究表明,二紅洼巖體的母巖漿在深部巖漿房過程中并未發(fā)生硫化物熔離作用,其中第一期巖漿作用演化程度較低,橄欖石Fo值為77.0~83.4,巖漿在運(yùn)移或者就位過程中約占橄欖石1/140~1/25的硫化物熔離,造成該巖體Cu-Ni硫化物礦化;第二期巖漿作用是深部巖漿房高度分異演化的產(chǎn)物,橄欖石Fo值為61.1~66.7,高度的分異演化作用使Fe-Ti等成礦物質(zhì)在殘余巖漿中富集.兩期不同演化程度的基性-超基性熔漿的先后侵位造成了二紅洼巖體Cu-Ni硫化物和Fe-Ti氧化物的復(fù)合礦化.
[Abstract]:The magmatic process of Cu-Ni sulphide and Fe-Ti oxides complex mineralization in Erhongwa Magnesium-Fe ultramafic body is helpful to study the mechanism of CuNi-VTiFe composite mineralization. Firstly, the electron probe analysis of olivine in two different intrusive phases was carried out. Secondly, the differentiation and evolution of magmatism and the degree of sulfide melting were simulated. The results show that the parent magma of Erhongwa pluton did not occur sulfide melting in the deep magma chamber, and the first stage of magmatism evolution is relatively low. The Fo value of olivine is 77.0 ~ 83.4, and the sulphide melt of about 1 / 140 / 1 / 25 of olivine in the process of migration or emplacement of olivine results in Cu-Ni sulphide mineralization of the rock, and the second stage of magmatism is the product of the highly differentiated evolution of deep magma chambers. The F _ o value of olivine is 61.1 ~ 66.7.The highly differentiated evolution results in the enrichment of Fe-Ti and other ore-forming minerals in residual magma. The emplacement of basic-ultrabasic melts in two stages resulted in the complex mineralization of Cu-Ni sulphide and Fe-Ti oxides in Erhongwa rock mass.
【作者單位】： 中國地質(zhì)大學(xué)地球科學(xué)與資源學(xué)院;北京礦產(chǎn)地質(zhì)研究院;
【基金】：國家自然科學(xué)基金項(xiàng)目(No.41372102)
【分類號】：P587;P611

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