卡拉麦里1号金矿地球化学特征及意义

XinJiang Karamori No.1 Gold Deposit Geochemical Characteristics and Its Significance

卡拉麦里1号金矿是卡拉麦里成矿带新发现的大型金矿床,矿区内蚀变带和石英脉非常发育。分析研究区石英脉及火山岩的地球化学特征,可有效认识该金矿的物质来源、成矿条件及成矿热液特征。对卡拉麦里1号金矿矿区石英脉和火山岩样品进行地球化学分析,稀土元素主要特征为:Eu呈现正异常现象(δEu>1),Ce表现负异常现象(δCe<1),轻稀土相对富集,稀土元素模式图上曲线整体平坦右倾,与下地壳稀土元素曲线相似;富集U,Nb,Sr,Zr,Y等元素,而Ta,La,Nd,Hf,Yb等元素相对亏损;Co∕Ni、Hf∕Sm、Nb∕La、Th∕La值较低,平均值小于1。结合前人的研究成果,认为该金矿床的成矿物质来源于幔源,是还原环境下形成的中低温热液蚀变型金矿床。

Karamori No. 1 gold deposit is the newly discovered large gold deposit in the metallogenic belt in Karamori, the alteration zones and quartz veins are well developed in mining areas.To analyze quartz veins and geochemical characteristics of volcanic rocks within the study area.It can effectively recognize the source material and metallogenic conditions and the characteristics of hydrothermal ore-forming solution.This paper focuses on geochemical analysis of the samples collected from quartz veins and volcanic rock of the mining areas in Karamori No. 1 gold deposit,the main features of REE are：Eu shows positive abnormal phenomena （δEu〉1）,Ce shows negative abnormal phenomena （δCe〈1）,the LREE is relatively enriched.The curves from the REE model graph are the overall flat and right deviation,and are similar to the lower crust rare earth elements curve,and are enriched in U,Nb,Sr, Zr, Y and other elements,while Ta,La,Nd, Hf, Yb and other elements are relatively lost;Co/Ni,Hf/Sm,Nb/La,Th/La value is lower, the average value is less than 1,Combining with results of previous studies,this paper considers that the mineral-forming material in this gold deposits come from mantle,and this gold deposits are in the low-to-moderate temperature hydrothermal alteration type gold deposit under the reducing environment.