陕西镇安丘岭卡林型金矿金的赋存状态和富集机理

华曙光; 王力娟; 贾晓芳; 陈蕾; 李建威

doi:10.3799/dqkx.2012.107

Volume 37 Issue 5

Sep. 2012

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Article Navigation > Earth Science > 2012 > 37(5): 989-1002

HUA Shu-guang, WANG Li-juan, JIA Xiao-fang, CHEN Lei, LI Jian-wei, 2012. Occurrence and Enrichment Mechanism of Gold in the Qiuling Carlin-Type Gold Deposit, Zhen'an County, Shaanxi Province, China. Earth Science, 37(5): 989-1002. doi: 10.3799/dqkx.2012.107

Citation:

HUA Shu-guang, WANG Li-juan, JIA Xiao-fang, CHEN Lei, LI Jian-wei, 2012. Occurrence and Enrichment Mechanism of Gold in the Qiuling Carlin-Type Gold Deposit, Zhen'an County, Shaanxi Province, China. Earth Science, 37(5): 989-1002. doi: 10.3799/dqkx.2012.107

Citation:

HUA Shu-guang, WANG Li-juan, JIA Xiao-fang, CHEN Lei, LI Jian-wei, 2012. Occurrence and Enrichment Mechanism of Gold in the Qiuling Carlin-Type Gold Deposit, Zhen'an County, Shaanxi Province, China. Earth Science, 37(5): 989-1002. doi: 10.3799/dqkx.2012.107

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Occurrence and Enrichment Mechanism of Gold in the Qiuling Carlin-Type Gold Deposit, Zhen'an County, Shaanxi Province, China

doi: 10.3799/dqkx.2012.107

HUA Shu-guang^{1, 2},
WANG Li-juan³,
JIA Xiao-fang⁴,
CHEN Lei^{1, 5},
LI Jian-wei^{1, 5
,
,}

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
No.5 Gold Geological Party of Chinese Armed Police Force, Xi'an 710100, China
3.
College of Earth Sciences, Jilin University, Changchun 130061, China
4.
No.4 Institute of Geology and Mineral Exploration of Inner Mongolia, Jining 012000, China
5.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2011-11-08
Available Online: 2021-11-10
Publish Date: 2012-09-15

Abstract

Abstract

Located in the western Qinling orogen, the Qiuling gold deposit is a typical Carlin-type gold deposit. Gold mineralization is hosted in calcareous siltstones, silty shales, and argillaceous limestones of the Upper Devonian Nanyangshan Formation and the Lower Carboniferous Yuanjiagou Formation. Pyrite and arsenopyrite dominate the metallic minerals, whereas quartz, calcite, and sericite are the main non-metallic alteration minerals. An integration of optical microscopy, scanning electron microscopy equipped with energy dispersive system, electron microprobe, and laser ablation ICP-MS was used to study the occurrence, distribution, and enrichment mechanism of gold in the Qiuling gold deposit. The results indicate that gold occurs as submicroscopic and, less significantly, microscopic species. The submicroscopic gold is present as nanoparticles of native gold (Au⁰) in the coarse-grained pyrite and solid solution (Au⁺) in the arsenian rims of zoned pyrite and arsenopyrite, with lesser amount of gold nanoparticles in the As-deficient core of zoned pyrite. The sub-microscopic gold particles in the core of zoned pyrite were likely formed during the diagenesis of the host rocks through adsorption, while the structure-bounded Au (Au⁰ and Au⁺) in fine-grained zoned pyrite and arsenopyrite may have been transported as sulfur and arsenic complexes in ore-forming fluids of the main hydrothermal stage. Microscopic gold grains are mostly less than 3 to 5 μm in size and are contained in the marginal areas fine-grained pyrite and included in hydrothermal sericite, quartz, and calcite. They formed likely due to local saturation of gold in the ore fluids or as a result of leaching of the submicroscopic gold by late-stage fluids and subsequent re-precipitation.
- Qiuling gold deposit,
- Carlin-type gold deposit,
- gold solid solution,
- invisible gold,
- Qinling orogen

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Occurrence and Enrichment Mechanism of Gold in the Qiuling Carlin-Type Gold Deposit, Zhen'an County, Shaanxi Province, China

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