豫西栾川县骆驼山硫锌多金属矿床闪锌矿微量元素地球化学特征及其地质意义  

Trace element geochemistry of the Luotuoshan sulfur-zinc polymetallic deposit in Luanchuan,western Henan,and its geological implications

作　　者：裴秋明 张寿庭[1] 曹华文[1] 唐利[1] 许腾[1] 李军军 张旭晃 郭娜娜 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]栾川县地质矿产局,河南洛阳471500

出　　处：《岩石矿物学杂志》2015年第5期741-754,共14页Acta Petrologica et Mineralogica

基　　金：国家十二五科技支撑计划项目(2011BAB04B06);中国地质调查局地质调查项目(1212011220925)

摘　　要：豫西栾川晚侏罗世中酸性岩浆热液活动形成了一套Mo-W(Fe)-Pb-Zn-Ag多金属成矿系列。其中骆驼山硫锌多金属矿床位于南泥湖矿田岩体的外接触带。在野外地质调查的基础上,通过ICP-MS对该矿床中闪锌矿/黄铁矿微量元素地球化学特征进行了详细研究。研究表明,矿床中闪锌矿微量元素的组成以富集Cd、In、Cu,亏损Ga、Tl为主要特征;Cd、In、Ga等分散元素主要赋存在闪锌矿中,Co、Ni主要富集在黄铁矿中。闪锌矿/黄铁矿中的∑REE含量均明显低于近矿围岩,早阶段闪锌矿轻重稀土元素分馏明显,配分曲线右倾;晚阶段闪锌矿LREE含量降低,配分曲线趋向平缓,并与晚阶段黄铁矿呈现互补性异常。闪锌矿的部分微量元素如Ga、Ge、Cd、In、Tl等能指示成矿温度、成矿流体特征及矿床成因,总体上闪锌矿微量元素组成特征与岩浆热液型矿床一致,与栾川中鱼库矿床成因相近,矿床形成于中高温环境。通过与邻区矿床对比分析,显示从成矿系列的过渡带到外围,成矿温度等特征呈规律性变化。The intermediate-acid magmatic hydrothermal activity in the late Jurassic led to the formation of a Mo-W（Fe）-Pb-Zn-Ag polymetallic metallogenic series in Luanchuan area, western Henan. The Luotuoshan sul- fur-zinc polymetallic deposit is located in the contact zone between the rock mass and the strata in the Nannihu orefield. The characteristics of trace elements were studied by using ICP-MS analysis of sphalerite and pyrite based on field geological investigation. Trace element data confirm that the sphalerite from the Luotuoshan de- posit is characterized by enrichment of Cd, In and Cu and depletion of Ga and T1. The dispersed elements such as Cd, In, Ga mainly occur in sphalerite, while Co and Ni mainly occur in pyrite. The values of rare earth elements （∑REE） in sphalerite and pyrite are obviously lower than those in wall rocks. REE of the early stage sphalerite shows a fairly pronounced fractionation and has right-inclined patterns. The REE fractionation is not pronounced, with lower ∑LREE, and the patterns are relatively flat, which shows a opposite trend in the pyrite when it came to the late stage. Some kinds of trace elements like Ga, Ge, Cd, In and T1 can be indicators for metallogenic temperature, ore-forming fluid and genesis. The features of trace elements in sphalerite are closely related to the magrnatic hydrothermal activity and suggest that this is a relatively medium-high temperature deposit which is similar to the Zhongyuku deposit in Luanchuan. Ore-forming conditions such as metallogenic temperature exhibit regular variation, as shown by the comparative analysis of the deposits from the proximal part to the periphery of the metallogenic series.

关 键 词：闪锌矿 微量元素 地球化学 成矿系列 骆驼山 

分 类 号：P595[天文地球—地球化学] P618.2[天文地球—地质学]