Geology, ore-forming fluid and genesis of the Qiucun gold deposit: Implication for mineral exploration at Dehua prospecting region, SE China

Origin of Late Jurassichigh‐Kfelsic volcanic rocks and related Au mineralization in the Dongyang deposit, central‐eastern Fujian,SEChina, and its tectonic implications

“…In addition, the Au mineralization‐related felsic magmatism in central‐eastern Fujian and its surroundings (Table 5) is associated with distinct episodes in the Late Jurassic (164–145 Ma) and Cretaceous (145–100 Ma; Chen, Lee, & Shinjo, 2008; Hu & Zhou, 2012; Hua et al, 2010; Mao et al, 2008, 2013). The corresponding magmatic products (volcanic or sub‐volcanic rocks) in the region have been dated at 164–151 Ma or 145–103 Ma, including central‐eastern Fujian and eastern Guangdong, such as the Dongyang (160–151 Ma; Xu, Sun, Lei, et al, 2019) and Qiucun (160–158 Ma; Ni et al, 2018) deposits, the Zijinshan Au–Cu deposit (164–103 Ma; Li et al, 2013; Huang et al, 2013; Liang et al, 2013), and the Jinkeng Sn deposit (144–139 Ma; Qiu, Li, et al, 2017; Yan et al, 2018). These ages, together with the abundance of magmatic rocks in central‐eastern Fujian with ages of 164–150 Ma (Mao et al, 2013; Ye et al, 2014), suggest that a significant Au mineralization‐related felsic magmatic event occurred between 164 and 150 Ma in southern China.…”

“…The special position makes it distinct with respect to the variety of types of magmatic rocks, especially those associated Au mineralization and the metallogenic peak from the southeast coast magmatic belt (Li et al, 2018; Qiu, Li, et al, 2017; Xu, Jiang, Luo, Zhao, & Ma, 2017, Xu et al, 2019). More than 10 large‐scale Au ore deposits have been discovered in this belt, such as Zijinshan, Qiucun, Dongyang, and Shuangqishan, and these deposits generally formed in the Early Cretaceous and Late Jurassic (Chen, 2012; Liang et al, 2013; Ni et al, 2018; Xu et al, 2019), which is similar to the W–Sn mineralization in eastern Guangdong Province that formed in the Late Jurassic (e.g., Huang, Li, Li, & Li, 2013; Jiang et al, 2013; Xu et al, 2015, 2016). Thus, the detailed study of these deposits can provide not only the establishment of a magmatic metallogenic framework in southwest Fujian but also constructive data for the temporal and spatial distribution of Mesozoic mineralization in South China.…”

“…The Dongyang Au deposit is a large epithermal gold deposit of low‐sulphidation type (Ni et al, 2018; Xu, Sun, Lei, et al, 2019), and the high‐K felsic volcanic materials (surrounding rocks) widely developed in the study area have not been studied. Here, based on a geological survey project, we carried out 1:5,000 large‐scale geological mapping, borehole documentation, and underground surveys in the study area.…”

Effects of arsenic on the distribution and mode of occurrence of gold during fluid-pyrite interaction: A case study of pyrite from the Qiucun gold deposit, China

“…Fluid boiling is also an effective way of scavenging metals (e.g., Au) from hydrothermal fluids (Brown, 1986;Cooke, 2000;Simmons et al, 2005), as a result of changes in physico-chemical conditions (e.g., pH, temperature, and sulfur fugacity; Heinrich et al, 2007). Fluid boiling is thought to be the main control on Au mineralization within the Qiucun Au deposit as evidenced by data from fluid inclusions and petrographic and textural analysis (Ni et al, 2018). Combining the results of this previous research with the data presented in this study suggests that interfaces where As significantly substituted for S within pyrite may reflect a period of fluid boiling that causes an abrupt drop in either S fugacity or temperature or an increase in pH.…”

“…DOI: https://doi.org/10.2138/am-2021-7675. http://www.minsocam.org/ respectively (Ni et al, 2018). These auriferous veins contain visible Au in the form of electrum closely associated with chalcopyrite and pyrite (Fig.…”