Texture and trace element geochemistry of quartz in skarn system: Perspective from Jiguanzui Cu–Au skarn deposit, Eastern China

Zhang, Yu; Cheng, Jing; Tian, Jing; Pan, Jing; Sun, Siquan; Zhang, Lejun; Zhang, Shitao; Chu, Gaobin; Zhao, Yi-jun; Lai, Chun‐Kit

doi:10.1016/j.oregeorev.2019.05.007

Cited by 30 publications

(21 citation statements)

References 35 publications

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“…At synore stage 1, the alteration comprises mainly K-feldspar with minor quartz, as revealed by field and thin-section microscopic observations. (Muller, Herklotz, & Giegling, 2018;Zhang, Cheng, et al, 2019). The Cu, Ag, Pb contents have a high correlation with gold at Baiyun deposit (Li, Shen, et al, 2019), and are rich in quartz.…”

Section: Silicic-potassic Alteration Processmentioning

confidence: 95%

“…Fluid inclusion studies of syn-ore stage 1 indicated low-medium homogenization temperatures (162-350 C), low salinities, and belong to a NaCl-H 2 O-CH 4 -CO 2 ± H 2 S fluid system (Liu et al, 2019;Yang, Song, Chai, & Li, 2017;Zhang, Cheng, et al, 2019 (Zhang, Kou, et al, 2019). The H-O isotopic values suggest that the ore-forming fluids are mainly of primary magmatic origin with an input of metamorphic fluids and meteoric water.…”

Section: Ore-forming Processmentioning

confidence: 99%

“…The Baiyun deposit was mainly formed in the Triassic (225 to 240 Ma) (Zhang et al, 2016;Zhang, Cheng, et al, 2019). There are a number of Au-(Ag) and Pb-Zn deposits and porphyry Mo deposits in the Qingchengzi orefield, which have a genetic link with coeval magmatic rocks (Zhang, Kou, et al, 2019) (Naden & Shepherd, 1989;Qiu et al, 2020;Zhen, Gu, & Zhou, 1990).…”

Section: Ore-forming Processmentioning

confidence: 99%

“…Simplified tectonic maps of (a) Liaodong Peninsula, showing the major faults and tectonic blocks; (b) Qingchengzi orefield, showing the distribution of deposits. Modified from Wang et al (2017) and Zhang, Cheng, et al (2019) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Settingmentioning

confidence: 99%

“…The Liaodong and Jiaodong Peninsula regions are two major gold provinces in the eastern North China Craton (Deng et al, 2020; Goldfarb, Qiu, Deng, Chen, & Yang, 2019; Yang et al, 2016; Yang et al, 2017). The Baiyun deposit is a large gold deposit in the Liaodong Peninsula (Deng & Wang, 2016; Zhang et al, 2019), which contains over 31.7 t of gold with an average grade of 2.85 g/t. Alteration is well developed in the mining area, including pyritization, silicic alteration, K‐feldspar alteration, sericitization, carbonatization, and chloritization, among which the former three are closely related to Au mineralization (Hao, Zhao, & Zhao, 2017; Liu & Ai, 1999; Qiu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal alteration and mineralization of Baiyun gold deposit in Liaodong Peninsula, North China Craton

Zhang

Wang

et al. 2020

Geological Journal

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Baiyun deposit is a large gold deposit in the Liaodong Peninsula (North China Craton), containing over 31.7 t of gold. Silicic alteration, K-feldspar alteration, and pyritization are well developed and closely related with mineralization in Baiyun deposit. Based on field and optical microscopic observations, the alteration styles include quartz + K-feldspar zone, pyrite + sericite +quartz zone, and chlorite zone from orebody outward. In this study, the quartz, K-feldspar, and pyrite of pre-ore, syn-ore stages 1 and 2 were selected for LA-ICP-MS trace element analysis and electron probe microanalysis (EPMA) to reveal the alteration-mineralization link. Results show that the albite was altered to mainly K-feldspar and minor secondary quartz at syn-ore stage 1. Fluid-rock reaction of the silicic-potassic alteration may have decreased the fluid oxygen fugacity (fO 2 ), which triggered the gold precipitation. Most of invisible gold occurred in the form of solid solution. At syn-ore stage 2, albite altered to mainly quartz and minor K-feldspar. The syn-ore stage 1 K-feldspar also altered to minor secondary quartz at syn-ore stage 2. In addition, the release of sulphur from the syn-ore stage 1 pyrite was likely another trigger for the gold precipitation. Most of syn-ore stage 2 invisible gold occurred as nano-particles. The ore-forming fluids consist mainly of primary magmatic fluids mixed with minor metamorphic fluids. The ore metals may have sourced mainly from the magmatic fluid and the sillimanite-mica schist of the Gaixian Formation.

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Section: Silicic-potassic Alteration Processmentioning

confidence: 95%