河南栾川三道沟铅锌银矿床方解石地球化学特征及Sm-Nd年龄研究

发布时间：2018-05-25 01:24

  本文选题：铅锌银矿床 + 方解石　； 参考：《地球化学》2016年02期

【摘要】：三道沟铅锌银矿床位于华北陆块南缘栾川多金属矿集区西部。受断裂控制的薄脉状矿体赋存于新元古界栾川群南泥湖组碎屑岩、碳酸盐岩地层中。本文在矿床地质特征和矿物学研究的基础上,对早、中、晚3个成矿阶段的9件热液方解石进行微量元素、稀土元素和Sm-Nd同位素测年研究。结果表明方解石的稀土元素总量(?REE)为6.42~216μg/g,富集重稀土元素,HREE/LREE比值为1.47~5.94;δEu=0.62~2.71,具弱Ce异常;强烈亏损Nb和Zr,富集Pb。从成矿早阶段到晚阶段,∑REE值、LREE/HREE比值和δEu值逐渐减小。Y/Ho-La/Ho图解和Tb/Ca-Tb/La图解均指示该矿床方解石为热液成因。方解石147Sm/144Nd和143Nd/144Nd同位素比值具有良好的线性关系,等时线年龄为(138.3±2.6)Ma(2σ,MSWD=2.3)。结合矿集区内成岩-成矿年代学资料,认为三道沟矿床与区内最晚阶段的花岗质岩浆活动(136~142 Ma)有关,属于栾川Mo-W-Pb-Zn-Ag多金属成矿系统中的热液脉型铅锌银矿床。
[Abstract]:Sandaogou lead-zinc-silver deposit is located in the west of Luanchuan polymetallic deposit area in the southern margin of North China continental block. The thin vein orebodies controlled by faults occur in the clastic and carbonate strata of the Nannihu formation of the Luanchuan Group in the Neoproterozoic. Based on the study of geological characteristics and mineralogy of the deposit, the trace elements, rare earth elements and Sm-Nd isotopic dating of 9 hydrothermal calcite in early, middle and late metallogenic stages have been studied in this paper. The results show that the total REE of calcite is 6.42 渭 g / g, the HREE / LREE ratio of enriched heavy rare earth elements is 1.470.94, 未 Eu0.62 / 2.71 is weak ce anomaly, NB and Zrare depleted strongly and PBB is enriched. From the early metallogenic stage to the late stage, the 鈭，

本文编号：1931458