新疆希勒库都克铜钼矿床黄铁矿微量元素和稀土元素特征  

Charteristics of REE composition and trace element of the pyrites from the Xilekuduke Cu- Mo deposit in Xinjiang

作　　者：龙灵利[1,2] 王京彬[1,2,3] 王玉往[1,2,3] 王莉娟[2] 廖震[1,2] 赵路通[1,2] 孙志远[1,2] 李德东[1,2] 高一菡[1,2] 

机构地区：[1]北京矿产地质研究院,北京100012 [2]有色金属矿产地质调查中心,北京100012 [3]中色地科矿产勘查股份有限公司,北京100012

出　　处：《矿产勘查》2014年第2期169-177,共9页Mineral Exploration

基　　金：国家自然科学基金项目(编号:41202064);国家重点基础发展研究计划项目(编号:2014CB440803);中国地质调查局项目(编号:121200113086300)共同资助

摘　　要：新疆希勒库都克铜钼矿床是一个形成于早石炭世晚期的斑岩型矿床.矿区黄铁矿稀土总量为0.64×10-6 ～317×10-6,轻稀土相对富集,重稀土较为平缓,（La/Yb）N为3.23 ～ 38.84,（La/Sm）N为1.85～8.15,（Gd/Lu）N为0.65 ～5.24;铕多表现为较明显负异常,δEu为0.47～0.64,铈多具弱的负异常,δCe为0.49 ～ 0.99.黄铁矿的微量和稀土元素配分曲线模式特征与含矿斑岩类似,表明二者具同源性;Co/Ni比值介于0.46～ 11.65之间,显示岩浆热液成因特征;Y/Ho比值主要集中在29.4 ～ 35.0之间,与含矿斑岩体相似,分布在球粒陨石值附近,表明成矿流体可能来源于含矿斑岩.希勒库都克铜钼矿区黄铁矿微量元素和稀土元素地球化学特征综合反映出它们是同一岩浆热液作用的产物,成矿流体来源于含矿斑岩体.文章的研究结果进一步佐证了该矿床的斑岩型矿床成因.The Xilekuduke Cu-Mo deposit,located in the Fuyun County,Xinjiang is a porphyry-type deposit which was formed in late stage of early Carboniferous.The REE abundance of pyrite from the Xilekuduke Cu-Mo deposit is relatively high with a range of from 0.64 × 10-6 to 317 × 10-6 of ∑ REE.The light REE is relatively rich while the heavy REE distribution patterns are flat characterized with （La/Yb） N of 3.23 ～ 38.84,（La/Sm） N of 1.85 ～ 8.15,（Gd/Lu） N of 0.65 ～ 5.24.And the pyrites show obvious negative Eu anomaly with δEu of 0.47 ～ 0.64 and weak negative Ce anomaly with δCe of 0.49 ～ 0.99.The characteristics of REE distribution patters and trace element spectra of the pyrite are similar to that of the ore-bearing porphyry,which indicates there is the same source.The ratio of Co/Ni with 0.46 ～ 1 1.65 suggests that the pyrite has characteristics of hydrothermal-originated pyrite.The ration of ranging from 29.4 to 35.0 is close to the value 28 of Y/Ho within the chondrite,similar to the ore-bearing porphyry,which reveals that the ore-forming fluid is derivated from the ore-bearing porphyry.The geochemical characteristics of trace elements and REE of the pyrites from the Xilekuduke Cu-Mo deposit show that the pyrites from different types of rocks in the ore-district are the product of the same magma hydrothermal system,and the ore-forming fluid is originated from the ore-bearing porphyry magma.The study result provides further the evidence that the genesis of the Xilekuduke Cu-Mo deposit is the porphyry type deposit.

关 键 词：新疆 希勒库都克 微量元素 稀土元素 黄铁矿 地球化学 

分 类 号：P618.41[天文地球—矿床学] P618.65[天文地球—地质学]