现代地质2023，Vol.37Issue(6)：1495-1508,14.DOI:10.19657/j.geoscience.1000-8527.2023.070
胶东仓上金矿黄铁矿微量元素组成:对成矿流体和物质来源的揭示
Trace Elements Composition of Pyrites in the Cangshang Gold Deposit,Jiaodong:Implications for Source of Ore-forming Fluid and Material
摘要
Abstract
The Jiaodong gold province in North China Craton is one of the largest goldfields in China,with proven gold reserves over 5,000 tons.As an important gold deposit type in this region,disseminated ore has been widely studied for a long time,but the properties of ore-forming fluids and the sources of ore-forming ma-terials are still controversial.Based on the LA-ICP-MS pyrite analysis on the typical disseminated gold ore(from the Cangshang gold deposit)in northwestern Jiaodong,we discussed the ore-forming fluid properties and material sources of the deposit,which provides new constraints for further understanding of the ore-forming process.The results show that the pyrite Se content of the Cangshang gold deposit is relatively low(mean 1.601 × 10-6),indicating that the deposit may be mainly formed by sedimentary metamorphism.The Au/As ratio indicates that Au occurs in the form of lattice gold(Au+)in pyrite during the mineralization stages Ⅱ andⅢ.Combined with the published results on the Jiaodong ore-fluid properties,the relatively uniform Co/Ni ra-tios and the rise of the major pyrite Ag content at Cangshang indicate that the ore-forming fluid is mainly mag-matic,with certain input of metamorphic water and meteoric water.The low Te content indicates that the ore-forming material was less likely mantle-derived.However,the low Co and Ni contents are significantly different from the magmatic pyrite characteristics,suggesting that the ore-forming material may be mixed with minor mantle components.Combined with the tectono-magmatic events of the Jiaodong metallogenic period(about 120 Ma),it is suggested that the gold and relevant ore-forming materials may have sourced from the Precambrian metamorphic basement remobilized by Mesozoic activation and mixed with minor mantle components.关键词
仓上金矿床/黄铁矿/成矿流体/成矿物质Key words
Cangshang gold deposit/pyrite/ore-forming fluid/ore-forming material分类
天文与地球科学引用本文复制引用
冉笑宇,马遥,梁亚运,刘学飞..胶东仓上金矿黄铁矿微量元素组成:对成矿流体和物质来源的揭示[J].现代地质,2023,37(6):1495-1508,14.基金项目
国家自然科学基金项目"胶东巨量金来源及其成矿驱动机制"(42130801) （42130801）
高等学校学科创新引智基地项目("111"计划,BP0719021). （"111"计划,BP0719021）
