论文部分内容阅读
对二红洼镁铁-超镁铁岩体Cu-Ni硫化物和Fe-Ti氧化物复合矿化的岩浆作用过程的研究有助于探讨CuNi-VTiFe复合成矿作用的机制.首先通过对两个侵入期次不同侵入相的橄榄石进行了系统的电子探针分析,其次,对岩浆作用过程的分异演化程度和硫化物熔离程度进行了模拟.研究表明,二红洼岩体的母岩浆在深部岩浆房过程中并未发生硫化物熔离作用,其中第一期岩浆作用演化程度较低,橄榄石Fo值为77.0~83.4,岩浆在运移或者就位过程中约占橄榄石1/140~1/25的硫化物熔离,造成该岩体Cu-Ni硫化物矿化;第二期岩浆作用是深部岩浆房高度分异演化的产物,橄榄石Fo值为61.1~66.7,高度的分异演化作用使Fe-Ti等成矿物质在残余岩浆中富集.两期不同演化程度的基性-超基性熔浆的先后侵位造成了二红洼岩体Cu-Ni硫化物和Fe-Ti氧化物的复合矿化.
The study on magmatic process of complex mineralization of Cu-Ni sulfide and Fe-Ti oxide in two red horizous mafic-ultramafic rocks is helpful to explore the mechanism of CuNi-VTiFe complex mineralization.Firstly, A series of intrusive olivines with different invaded facies were systematically investigated by electron microprobe analysis.Secondly, the degree of differentiation and evolution of sulfide magmatism and the degree of sulfide dissolution were simulated.The results show that the mother In the deep magma chamber, the magma did not migrate into sulfide magma. The evolution of the first magmatic stage was relatively low, the olivine Fo value was 77.0-83.4, and the magma accounted for about Olivine 1 during migration or in situ / 140 ~ 1/25 of the sulfide melted, resulting in the rock Cu-Ni sulfide mineralization; the second phase magmatism is the product of the deep magmatic chamber highly differentiated evolution, the olivine Fo value of 61.1 ~ 66.7, height , The mineralization of Fe-Ti and other ore-forming materials is enriched in the remnant magma.The two emplacement-ultramafic magmas with different degrees of evolution resulted in the formation of Cu-Ni sulfide And Fe-Ti oxide compound mineralization.