东昆仑夏日哈木铜镍硫化物矿床辉石特征及地质意义

发布时间：2019-03-07 22:09

【摘要】：夏日哈木铜镍硫化物矿床的发现在矿床规模、成矿时代及成矿区带方面都有重要意义。辉石作为最主要的造岩矿物之一,广泛赋存于该矿床的各岩相中,在橄榄岩相中多为填隙相,而在辉石岩相及辉长岩相中多呈堆晶相;总体上,斜方辉石含量大于单斜辉石含量。辉石Cr_2O_3含量在橄榄岩相、辉石岩相、辉长岩相具有依次降低的趋势,说明从早到晚含矿的橄榄岩相、辉石岩相、辉长岩相先后结晶,并非所有辉长岩相的结晶均早于橄榄岩相和辉石岩相;单斜辉石SiO_2、TiO_2及Na_2O含量之间的关系显示夏日哈木矿床母岩浆属拉斑玄武质岩浆,较高的Al_2O_3含量(2.55%~10.61%)暗示岩体形成过程中与富铝围岩发生了同化混染作用。
[Abstract]:The discovery of Hamu Cu-Ni sulphide deposit in summer is of great significance in the aspects of deposit size, metallogenic age and metallogenic belt. As one of the most important rock-forming minerals, pyroxene occurs widely in the various facies of the deposit. In the peridotite facies, most of them are interstitial facies, while in the pyroxenite facies and gabbro facies, most of the pyroxene facies are compositional facies. On the whole, the content of clinopyroxene is higher than that of clinopyroxene. The Cr_2O_3 content of pyroxene in peridotite facies, pyroxene facies and gabbro facies decreased in turn, indicating that the peridotite facies, pyroxene facies and gabbro facies crystallized successively from early to late ore-bearing facies. Not all feldspar facies crystallized earlier than peridotite facies and pyroxene facies. The relationship between the SiO_2,TiO_2 and Na_2O contents of clinopyroxene indicates that the parent magma of the summer Hamu deposit belongs to the porphyry basaltic magma. The high content of Al_2O_3 (2.55% ~ 10.61%) indicates that the rock mass was assimilated and stained with Al-rich surrounding rock during the process of rock formation.
【作者单位】：中国冶金地质总局矿产资源研究院;国土资源部岩浆作用成矿与找矿重点实验室中国地质调查局西安地质调查中心;
【基金】：国土资源部公益性行业科研专项项目(201511020) 国家自然科学基金青年基金项目(41603050) 中国地质调查局“东昆仑铜镍多金属资源基地调查”二级项目(DD20160013)联合资助
【分类号】：P618.41;P618.63

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