地质学报2026，Vol.100Issue(5)：1749-1765,17.DOI:10.19762/j.cnki.dizhixuebao.2025075
豫西潭头金矿床流体特征、碲化物形成条件及其对金富集过程的制约
Fluid characteristics,telluride forming conditions and their constraints on the process of gold enrichment in Tantou deposit,western Henan Province
摘要
Abstract
The Tantou deposit is located in the Xiong'ershan district,the southern margin of the North China Craton.Various types of tellurides are developed and closely associated with native gold.However,the characteristics of fluids,the telluride forming conditions and their constraints on gold enrichment remain unlcear.Based on the detailed division of metallogenic stages,the fluid properties,tellurides and native gold geochemical compositions analyzed in detail by microthermometry,H-O isotopes,scanning electron microscopy and electron probe microanalysis.Tantou gold deposit can be divided into four metallogenic stages:① K-feldspar-quartz stage;② quartz-pyrite stage;③ sulfide-telluride stage;④ quartz-carbonate stage.Gas-liquid inclusions are mainly developed in the quartz-pyrite stage.The homogenization temperatures for the quartz-pyrite stage and the sulfide-telluride stage are 275～363℃and 258～285℃,respectively,with salinities of 5.01%～9.32%NaCleqv and 5.62%～8.10%NaCleqv,densities of 0.68～0.84 g/cm3 and 0.71～0.86 g/cm3,pressures of 5.5～18.3 MPa and 4.1～6.5 MPa,and corresponding mineralization depths of 0.55～1.83 km and 0.41～0.65 km,respectively.Telluride are composed of petzite,sylvanite,stützite,empressite,hessite,altatite,lingbaoite,melonite,coloradoite and tellurium.Through the analysis of mineral assemblages and physical and chemical conditions,the formation conditions of quartz-pyrite stages are T=300℃,lgfO2=-36.8～-32.1,pH=3.7～5.7,lgfTe2=-18.0～-10.9,lgfS2=-11.6～-6.8,while that of sulfide-telluride stage are T=250℃,lgfO2=-37.5～-31.8,pH=3.9～5.9,lgfTe2=-12.9～-9.4,lgfS2=-14～-9.5.From the quartz-pyrite stage to the sulfide-telluride stage,as the ore-forming depth becomes shallower,the temperature and lgfS2 of the fluid decrease,while the lgfTe2 increases.The salinity,density,lgfO2,and pH remain essentially unchanged.The early stage(quartz-pyrite stage)mainly precipitated Te-Au-rich pyrite through water-rock reaction,and the late stage(sulfide-telluride stage)mainly formed a large amount of sulfide,telluride and natural gold through fluid mixing.The tellurides start forming a metallic melt,which continuously extracts Au elements from the fluid,leading to the co-enrichment and precipitation of tellurides and gold.关键词
流体包裹体/碲化物/自然金/富集机制/潭头金矿Key words
fluid inclusions/tellurides/native gold/enrichment mechanism/Tantou deposit引用本文复制引用
姚东东,抄尉尉,冷成彪,叶会寿,王大钊,高明,曹渊..豫西潭头金矿床流体特征、碲化物形成条件及其对金富集过程的制约[J].地质学报,2026,100(5):1749-1765,17.基金项目
本文为国家自然科学基金项目(编号42102101,42202067,42202076)和威海市能源资源调查评价重点实验室开放课题(编号LDKF-2023WH-05)联合资助的成果. （编号42102101,42202067,42202076）
