地质与勘探2025，Vol.61Issue(5)：912-925,14.DOI:10.12134/j.dzykt.2025.05.003
胶东旧店金矿29号矿脉的成矿流体和成矿物质来源:基于流体包裹体以及H-O-S同位素的证据
Ore-Forming Fluids and Sources of Materials in vein No.29 of the Jiudian Gold Deposit,Jiaodong Peninsula:Insights from Fluid Inclusions and H-O-S Isotope Analysis
摘要
Abstract
The Jiaodong Jiudian gold deposit is located in the southern of the Zhaopong fault zone and is a medium-sized gold deposit characterized by quartz vein-type mineralization.This study focused on the vein No.29 in the Jiudian gold deposit of the Jiaodong Peninsula.Fluid inclusion studies and H-O-S isotope analyses of quartz and pyrite from the ores were conducted to constrain the properties and origins of the ore-forming fluids.The results show that the fluid inclusions are predominantly two-phase aqueous(L-V),CO2-H2O three-phase,and minor pure CO2 single-phase types.The homogenization temperatures range from 193.4℃to 340.9℃,with a peak between 250℃and 290℃.The salinities(wt％Nacleqv)vary from 4.8％to 12.5％,indicative of a moderate-temperature,moderate-low salinity,and CO2-rich fluid system.The δ18OV-SMOW values of quartz range from 11.6‰ to 12.4‰,and δDV-SMOW values vary from-83.0‰ to-76.4‰.The calculated δ18OH2O values of the fluid range from 3.5‰ to 4.3‰.The δ34S values of pyrite range from 7.6‰ to 8.5‰,with an average of 8.1‰.These isotopic features suggest a magmatic-hydrothermal origin with contributions from crustal fluids and meteoric water during fluid migration.Combined with previous studies,fluid immiscibility is considered the key mechanism for gold precipitation.The mineralization was facilitated by thermal upwelling-extensional structures related to the subduction and rollback of the Pacific Plate during the Mesozoic.关键词
旧店金矿床/29号脉/成矿流体/成矿物质/流体包裹体/H-O-S同位素/胶东地区Key words
Jiudian gold deposit/vein No.29/ore-forming fluids/ore-forming materials/fluid inclusions/H-O-S isotopes/Jiaodong Peninsula分类
天文与地球科学引用本文复制引用
刘欢,鲁浩,史猛,林大伟,尹升,张鲁涛,宋维雨..胶东旧店金矿29号矿脉的成矿流体和成矿物质来源:基于流体包裹体以及H-O-S同位素的证据[J].地质与勘探,2025,61(5):912-925,14.基金项目
山东省自然科学基金(编号:ZR2022QD060)、新一轮找矿突破战略行动科技支撑项目(编号:ZKKJ202406)、山东省省级地质勘查项目(编号:鲁勘字(2024)71号)和2024年乳山市金矿资源勘查项目(编号:SDGP371083000202402000014)联合资助. （编号:ZR2022QD060）
