Evolution of Pyrite Compositions at the Sizhuang Gold Deposit, Jiaodong Peninsula, Eastern China: Implications for the Genesis of Jiaodong-Type Orogenic Gold Mineralization

Gold deposits in the Jiaodong Peninsula represent a primary gold resource China and mostly exhibit similar ore-forming features related to sericite-quartz-pyrite alteration other controls from (micro-)structural deformation. This study investigates pyrite textures trace elements Sizhuang deposit (>100 t Au) document key factors impacting on genesis of Jiaodong-type orogenic deposits. Three main types are identified: (1) first generation (Py1) occurs as disseminated euhedral subhedral grains K-feldspar-albite-rutile-hematite sericite (stage 1), (2) Py2 aggregates quartz-sericite-pyrite altered rocks or quartz-pyrite veins 2) can be subdivided into Py2a irregular cores, Py2b zoned overgrowth Py2a, Py2c early pyrite, (3) Py3 fine-grained crystals siderite-polymetallic 3). Primary at is coevally slightly later deposited with Py2b, Py2c, Py3. Laser ablation–inductively coupled plasma mass spectrometry (LA–ICP–MS) analyses show that highest Co Ni contents Py1 high but variable favors involvement deep high-temperature magmatic waters stage 1 middle 2. The elevated As depletion (e.g., Co, Ni, Te) Au/Co, Cu/Ni, As/Ni values Py3, combined published H-O isotope data, imply meteoric water ingress during 2–3. Thus, fluid evolution consequence pulsed release plus progressive ingress. rhythmic Co–As–Ni–Au bands additionally suggest episodic changes composition fluids. Moreover, sharp textural previously cataclastic crystals) As-Cu-rich Co-poor probably also reflect rapid metal deposition self-organization subsequent mineral crystal growth due pressure phase separation deposit. Considering significantly concentrated (>1300 t) regional Jiaojia fault zone Au-bearing formation (boiling) deposit, mineralization was interpreted controlled by pressure-driver owing seismic activities system.