钦杭带兴源冲铜矿床微量及稀土元素的地球化学特征及其意义

发布时间：2018-09-04 09:50

【摘要】：江西万载兴源冲铜多金属矿床是赣西北近年来的找矿突破成果之一,其矿床成因研究薄弱。兴源冲铜多金属矿床主要矿段有野猫冲、枫树坳、刘家冲等。矿体呈脉状、似层状赋存在宜丰(岩)组第二岩片中部岩层内,主要金属矿物有黄铜矿、黄铁矿、闪锌矿、方铅矿、方铜矿等。本文选取枫树坳矿段ZK12101中具有原生沉积特征矿石及其上下盘围岩为研究对象,采用ICP-MS方法,分别测试其微量元素、稀土元素。结果表明,由条带(纹)状矿石→矿化围岩→远矿围岩,元素分布特征表现为Co,Ni含量渐趋降低而其它微量元素渐趋增高;矿化围岩及矿石均显著富集Co(13.56×10~(-6)~279.1×10~(-6))、Ni(40.95×10~(-6)~116.1×10~(-6))等元素,呈现峰值,亏损Sr、Rb、Ba等绝大多数其它微量元素,呈现"谷"态;围岩样品ΣREE普遍高于矿石样品,δEu趋于略微升高,微弱变化。矿石和围岩具有近似的稀土配分曲线;以上元素地球化学行为均与典型热水沉积现象一致。矿石与围岩稀土特征显示其构造环境与大陆边缘岛弧相关。
[Abstract]:Wanzaixingyuan copper polymetallic deposit in Jiangxi province is one of the achievements of ore prospecting in northwest Jiangxi province in recent years, and the genetic study of the deposit is weak. The main ore segments of Xingyuanchong copper polymetallic deposit are Yamatsu, Maple au, Liu Jiachong and so on. The orebody is vein-like and bedded in the middle of the second member of the Yifeng formation. The main metal minerals are chalcopyrite, pyrite, sphalerite, galena, and so on. In this paper, the primary sedimentary ore and its upper and lower wall rocks in ZK12101 of Fengshuao ore section are selected as the research objects. The trace elements and rare earth elements are measured by ICP-MS method. The results show that the element distribution characteristics of the ore-forming surrounding rock of the striped (striped) ore show that the content of Co,Ni decreases gradually while the other trace elements gradually increase, and the mineralized rock and ore are significantly enriched in elements such as Co (13.56 脳 10 ~ (-6) ~ (279.1 脳 10 ~ (-6) and Ni (40.95 脳 10 ~ (-6) 116.1 脳 10 ~ (-6), showing a peak value. The 危 REE of surrounding rock samples is generally higher than that of ore samples, and 未 Eu tends to increase slightly and change slightly. The ore and surrounding rock have similar rare earth distribution curves, and the geochemical behaviors of the above elements are consistent with the typical hot water deposition phenomena. The REE characteristics of ore and surrounding rock show that the tectonic environment is related to the island arc of continental margin.
【作者单位】：中山大学地球科学与工程学院;广东省环境科学研究院;广东省地质过程与矿产资源探查重点实验室;里贾纳大学地质系;
【基金】：国家自然科学基金项目(41273040) 中国地质调查局项目(12120113067600)
【分类号】：P618.2

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