辽宁省桃源铅锌矿床成矿物质来源——硫、铅同位素组成特征

doi:10.13278/j.cnki.jjuese.20190117

摘要/Abstract

摘要： 桃源铅锌矿床是辽东青城子矿集区中部新发现的一个中型铅锌矿床，矿体赋存于古元古界辽河群大石桥组，受地层和断裂控制明显。目前缺乏针对该矿床的成矿物质来源研究，导致对矿床成因认识不清。本文在详细野外调研和室内镜下观察的基础上，系统地研究了桃源铅锌矿床的硫、铅同位素特征。分析结果显示：桃源铅锌矿床中硫化物的δ³⁴S值区间为3.5‰~8.9‰，平均为5.5‰，显示了具有幔源硫的特征；铅同位素²⁰⁶Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb和²⁰⁸Pb/²⁰⁴Pb分别为17.969~18.309（均值为18.076）、15.572~15.669（均值为15.617）和38.222~38.371（均值为38.312），μ值变化范围为9.46~9.62（均值为9.55），绝大多数低于地壳正常值。在铅同位素判别图解上位于上地壳与地幔铅同位素演化线之间，显示了具有壳幔混合的特点。桃源铅锌矿床的硫、铅同位素组成与青城子铅锌-金银矿集区和印支期岩体类似，成矿热液来自深部岩浆，与辽河群围岩的硫、铅同位素分布有明显的不同。因此，初步认为桃源铅锌矿床是与深部岩浆流体活动有关的岩浆热液型铅锌矿床。

关键词: 硫、铅同位素, 成矿物质来源, 桃源铅锌矿床, 青城子矿集区, 辽东

Abstract: Taoyuan Pb-Zn deposit is a newly discovered medium-sized Pb-Zn deposit in the central section of Qingchengzi ore concentration area in eastern Liaoning Province. The orebodies occur in the paleoproterozoic Dashiqiao Formation of Liaohe Group, which is controlled by the strata and fractures obviously. Due to the lack of research on the ore-forming material sources of the deposit, the genesis of the deposit is still unclear. Based on the field investigation and microscopic observation, the S and Pb isotopic characteristics of Taoyuan Pb-Zn deposit were studied in detail. The analysis results of sulfides show that the δ³⁴S values of the sulfides from Taoyuan Pb-Zn deposit range from 3.5‰ to 8.9‰, with an average of 5.5‰, which indicates the characteristics of mantle source sulfur; the Pb isotopic ratios of ²⁰⁶Pb/²⁰⁴Pb are 17.969-18.309, with an average of 18.076; the Pb ratios of ²⁰⁷Pb/²⁰⁴Pb are 15.572-15.669, with an average of 15.617, and those of ²⁰⁸Pb/²⁰⁴Pb are 38.222-38.371, with an average of 38.312. The μ values range from 9.46 to 9.62 (average 9.55), most of them are lower than those of normal Earth. On the Pb isotopic discrimination diagram, the Pb isotopic values are located between the crust and mantle Pb isotopic evolution lines, showing the mixing characteristics of crust and mantle. The S and Pb isotopic compositions of Taoyuan Pb-Zn deposit are similar to those of Qingchengzi Pb-Zn-Au-Ag deposit and Indosinian intrusive rocks, indicating that the ore-forming hydrothermal fluid came from deep magma, but obviously different from those of the Liaohe Group surrounding rocks. It is concluded that Taoyuan Pb-Zn deposit is a magmatic hydrothermal type Pb-Zn deposit, which is related to the deep magmatic fluid activity.

Key words: S and Pb isotopic, source of ore-forming materials, Taoyuan Pb-Zn deposit, Qingchengzi ore concentration area, Liaodong area

中图分类号:

P618.4

林成贵, 姚晓峰, 程志中, 颜廷杰, 李生辉, 王伟. 辽宁省桃源铅锌矿床成矿物质来源——硫、铅同位素组成特征[J]. 吉林大学学报(地球科学版), 2021, 51(1): 81-94.

Lin Chenggui, Yao Xiaofeng, Cheng Zhizhong, Yan Tingjie, Li Shenghui, Wang Wei. Source of Ore-Forming Materials in Taoyuan Pb-Zn Deposit in Liaoning Province: Characteristics of S and Pb Isotopic Compositions[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(1): 81-94.

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