中文摘要：

金川矿床是我国最大的岩浆铜镍硫化物矿床,岩体主要由硫化物橄榄岩、含辉橄榄岩、二辉橄榄岩和橄榄辉石岩等岩相组成。以金川Ⅱ号岩体为例,根据岩相学观察和常量元素、微量元素地球化学特征的分析,试图对岩浆上升过程中的演化分异进行深入探讨,发现金川Ⅱ号岩体岩浆结晶分异演化过程主要包括深部岩浆房中尖晶石—橄榄石的分离结晶和浅部岩浆房辉石与斜长石的结晶,而地壳物质的同化混染发生在岩浆上升的整个过程,地壳物质的同化混染是导致母岩浆中硫饱和的主要因素。该岩浆分异演化过程间接支持了汤中立提出的＂深部分异-熔离,依次贯入＂成矿模式。

英文摘要：

The Jinchuan deposit is the largest Ni-Cu sulfide deposit in China. The intrusion is composed mainly of sulfide peridotite, harzburgite, lherzolite and pyroxenite. Samples for segment II of the Jinchuan intrusion, according to the petrographic observations, combined the analysis of geochemical features of major oxides and trace elements, the paper attempts to research the magma differential evolution in magma rising process. The authors consider that the fractional crystallization process of segment II of the Jinchuan intrusion contain the spi- nel-olivine fractional crystallization in the deep magma chamber and pyroxenite and plagioclase crystallization in the shallow magma chamber, and crustal contamination occur in the whole magma rising processes. In addition, the crustal contamination is the major factors of saturated sulfur. The above magma differentiation evolution supports the mineralization model proposed by Tang Zhongli.