Genesis and exploration potential of gold deposits in Archean high-amphibolite facies metamorphic rocks of the Jiaodong Peninsula: Geological and geochemical constraints from the Majiayao gold deposit

作者：Ligong Wang, Liqiang Yang, Wei Yang, Yunbao Zhi, Xie Dong, Bin Sun, Wen Zhang, Xiuzhang Li, Yingpeng Wang, Jinhui Wang · 发表于：Ore Geology Reviews · 年份：2025 · DOI：10.1016/j.oregeorev.2025.106596 · 被引用次数：4 · 研究领域：Geological and Geochemical Analysis、Geochemistry and Geologic Mapping、Geochemistry and Geochronology of Asian Mineral Deposits

• Medium temperatures, medium–low salinity, and CO 2 -rich H 2 O-CO 2 -NaCl ± CH 4 orefluids. • Sulfidation and fluid phase separation are dominant mineralization mechanisms. • Gold mineralization at 3.3–6.0 km depth suggests deep exploration is promising. The Jiaodong Peninsula, China, hosts the giant Jiaodong gold province, containing over 5,800 tonnes of proven gold resources. While 87% of these deposits reside in Mesozoic granites, the remaining 11% occur within Archean metamorphic terranes. Notably, the origin, enrichment processes, and genetic model of the Majiayao gold deposit, the largest hosted in Archean metamorphic rocks, remain poorly constrained. This study comprehensively analyzes the deposit geology, fluid inclusions, isotopes, and trace elements of the Majiayao deposit, aiming at clarifying the genesis of the deposit and perfecting the overall genetic model of Jiaodong gold deposits. The Majiayao mineralization exhibited a four-stage sequence: (1) milky quartz-sericite, (2) quartz-pyrite, (3) quartz-siderite-polymetallic sulfide, and (4) quartz-carbonate. Detailed petrographic analyses identified three fluid inclusion types: H 2 O-CO 2 -NaCl ± CH 4 (Type I), CO 2 (Type II), and H 2 O-NaCl (Type III). Homogenization temperatures of fluid inclusions in the four stages (from early to late) ranged from 198-298 °C, 136–289 °C, 112–264 °C, and 139–179 °C, corresponding to salinities of 3.33–11.05 wt%, 2.77–12.51 wt%, 2.41–12.51 wt%, and 0.18–4.03 wt% NaCl equivalent...