甘肃金川铜镍(铂)硫化物矿床岩浆通道前进方向探讨  

Moving direction of magmatic conduit metallogenic system in Jinchuan Cu-Ni(PGE)sulfide deposit

作　　者：刘美玉[1] 苏尚国[1] 宋晨[1] 蔡楠[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《中国工程科学》2015年第2期73-84,共12页Strategic Study of CAE

基　　金：国家自然科学基金项目(41272105);国家自然科学基金中俄合作基金联合资助;中国地质调查局项目(12120114085501);教育部博士学科点基金

摘　　要：综合运用地球化学手段,研究了金川铜镍(铂)硫化物矿床铂族元素的空间分布特征,并结合定量化结构分析,探讨了岩浆演化过程中的动力学作用过程,讨论了金川镁铁-超镁铁质岩浆的演化历程。研究发现,铂族元素在矿体中的空间分布呈一定规律变化。整体说来,自西向东,Pd/Ir-Ni/Cu在各矿体间呈递减趋势,分析认为造成这种规律的原因是矿石的形成经历了单硫化物固溶体(MSS)的分离结晶作用。通过岩石定量化结构分析发现,1号矿体较24号矿体岩石结构成熟度更高,分析认为1号矿体侵位时间早,后期结构调整更为充分。综合地球化学和岩浆动力学方面的信息,最终得出了金川岩浆通道系统在空间上表现为沿矿体走向自北西向南东前进的结论。By the using of geochemical methods and quantitative textural analysis, This pa- per studied the spatial distribution characteristics of platinum group elements in Jinchuan Ni-Cu- （PGE） sulfide deposit, discussed the dynamic behavior in the process of magma evolution, and the evolution of Jinchuan mafic-ultramafic magma .This study found that the spatial distribution of the platinum group elements showing a certain regular changes between four continuous ore bodies. Overall, there are a significant decrease in the value of Pd/Ir-Ni/Cu between the four ore bodies from west to east. Through the analysis, the cause which effected the distribution is that the monosulfide solid solution （MSS） has experienced a process of crystallization differentia-tion during crystal fractionation. On the other hand, through quantitative textural analysis, found that the structure of No. 1 ore body is much more mature than No. 1 ore body, which suggested that the emplacement of the former one is much more earlier than the latter one. Integrated geo- chemical and magma dynamics information, finally obtained the conclusion that the moving di- rection of Jinchuan magma conduit system is along the strike of the intrusions from northeast to southeast.

关 键 词：金川 Cu-Ni-(PGE) 硫化物矿床 岩浆通道成矿系统 前进方向 定量化结构分析 

分 类 号：P5[天文地球—地质学]