投稿时间：2020-03-29
修订日期：2020-10-24
网络发布日期：2021-03-06
中文摘要:柴北缘赛坝沟金矿床是青海省赛什腾山-阿尔茨托山成矿带上重要的岩金矿床，成矿地质条件优越。矿体赋存于北西-北北西向韧-脆性断裂构造组内，呈脉状、透镜状，构造控矿作用明显，矿石类型分为石英脉型和蚀变糜棱岩型。热液成矿期可划分为4个阶段：Ⅰ少量黄铁矿-烟灰色石英阶段、Ⅱ金-黄铁矿-乳白色石英阶段、Ⅲ多金属硫化物-金-灰白色-灰褐色石英阶段、Ⅳ灰白色-浅肉红色石英-碳酸盐岩阶段。文章基于各热液成矿阶段硫化物的硫、铅同位素研究，探讨了赛坝沟金矿床成矿物质来源。研究结果表明，赛坝沟金矿床矿石中硫同位素在0.50‰~3.93‰之间，分布集中，通过与区域矿床围岩及成矿后石英脉硫同位素值（3.7‰~4.0‰）进行比较，认为赛坝沟金矿中的硫除来自于围岩外，更多来自于深部的幔源流体；铅同位素组成特征分析表明，赛坝沟金矿床矿石铅主要来源于深部地幔与下地壳铅混合，也有少量上地壳铅的参与，而围岩铅主要来源于上地壳。
Abstract:Located in the Wulan area of Qinghai Province, the Saibagou gold deposit is an important rock gold deposit in the mineralization belt of the Xishtengshan-Alzto Mountain metallogenic belt. The ore deposit is distributed in the NW-NNW trending ductile-brittle fault tectonic group, and the structure-controlling orebody is vein-like and lenticular. The ore is divided into quartz vein type and altered mylonite type. The hydrothermal mineralization period can be divided into four stages:Ⅰ stage, a small amount of pyrite and smoky gray quartz, Ⅱ stage, gold-pyrite-milky white quartz, Ⅲ stage, polymetallic sulfide-gold-grayish to grayish brown quartz, Ⅳ stage, grayish white to pale red quartz-carbonate rocks. Sulfur and lead isotope analysis of sulfide in each hydrothermal metallogenic stage was carried out to reveal the source of the Saibagou gold deposit. The results show that the sulfur isotopes in the ore of the Saybagou gold deposit are distributed in the range of 0.50‰~3.93‰. By comparing with the sulfur isotopes in the surrounding rock of the regional deposit and the post-mineralization quartz vein (3.7‰~4.0‰), the authors hold that the sulfur in the Saybagou gold deposit came more from the deep mantle source flow than from the surrounding rock. The lead isotopic composition analysis shows that the lead in the ore of the Saibagou gold deposit mainly came from the mixture of the lead in the deep mantle and the lead in the lower crust, with a small amount of lead in the upper crust, while the lead in the surrounding rock mainly came from the upper crust.
keywords:geochemistry S-Pb isotope ore-forming material source Saibagou gold deposit northern margin of Qaidam
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基金项目:本文得到国家自然科学基金项目（编号：41973048）和山东省地矿局科技创新项目（编号：Y201924）联合资助
引用文本：
唐名鹰,何宗围,朱德全,张宇,高振华,董振昆,李小东.2021.柴北缘赛坝沟金矿床硫、铅同位素组成：对成矿物质来源的指示[J].矿床地质,40(1):117~127TANG MingYing,HE ZongWei,ZHU DeQuan,ZHANG Yu,GAO ZhenHua,DONG ZhenKun,LI XiaoDong.2021.S and Pb isotopic compositions in Saibagou gold deposit on north margin of Qaidam Basin: An indication to the source of metallogenic materials[J].Mineral Deposits40(1):117~127
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