The process of rubefication and its relationship with gold mineralization of Sizhuang gold deposit, northwestern Jiaodong Peninsula, eastern China

Wang, Hao; Yang, Liqiang; Wang, Sirui; Zhang, Liang; YuJi, WEI; GuangYao, Lü

doi:10.18654/1000-0569/2020.05.12

Cited by 6 publications

(8 citation statements)

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“…Stage 1 is marked by pervasive K-feldspar-albite-rutile alteration and quartz-sericite alteration in the Linglong biotite granite (Figure 3a,b). The K-feldspar-albite-rutile alteration consists of albite, K-feldspar, sericite, hematite, rutile, and pyrite associated with the dissolution of plagioclase, biotite, titanite, and magnetite [55]. Quartz-sericite alteration with the mineral assemblage of sericite, quartz, and minor pyrite formed slightly later than K-feldspar-albiterutile alteration.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Major lithological units exposed around Sizhuang are the Malianzhuang amphibolite (meta-gabbro) of the Archean Jiaodong Group and the Late Jurassic Linglong biotite monzonitic granite (Figures 2a and 3a). The Linglong granite hosts the most ore at Sizhuang and consists of plagioclase (~40 vol%), K-feldspar (~23 vol%), quartz (~28 vol%), and biotite (~5 vol%) with minor pyroxene, zircon, titanite, and apatite [55]. Gold mineralization is structurally controlled by the NNE-striking and NW-dipping Jiaojia fault and secondary faults or joints in the Linglong granitoid (Figure 2).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The K-feldspar-albite-rutile altera- Gold mineralization is structurally controlled by the NNE-striking and NW-dipping Jiaojia fault and secondary faults or joints in the Linglong granitoid (Figure 2). The Jiaojia fault displays hybrid ductile-brittle features with dip angles ranging from 30-45 • [55]. The main orebodies can be divided into three groups: (1) the No.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The Py1 crystals associated with different alteration share similar textural features such as fine-to middle-sized grains (mostly <300 µm in diameter) euhedral to subhedral (Figure 5a-d) and homogeneous BSE images. Minor amounts of Py1 grains occurred as coarse-grained cubic crystals [55]. Py1 locally displays porous textures due to the trapping of silicate mineral inclusions during growth (Figure 5d).…”

Section: Pyrite Texturesmentioning

confidence: 99%

“…Two-feldspar (K-feldspar and plagioclase) thermometer calculation and fluid inclusion analysis of the K-feldspar alteration in the Sizhuang deposit suggest the early alteration happened under high-temperature (~300 to 450 • C) conditions [58,65,85]. The quartz H-O isotopes from stage 1 are close to the primary magmatic water source region [55]. Thus, high Co concentrations in Py1 suggest early high-temperature fluids that were likely derived from deep magmatic intrusions.…”

Section: Fluid Evolution Recorded By Pyrite Compositionsmentioning

confidence: 99%

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

et al. 2021

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

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Pyrite Texturesmentioning

confidence: 99%

Section: Fluid Evolution Recorded By Pyrite Compositionsmentioning

confidence: 99%

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