Geology, geochronology, geochemistry and ore genesis of the Wangu gold deposit in northeastern Hunan Province, Jiangnan Orogen, South China

Deng, Teng; Xu, Deru; Chi, Guoxiang; Wang, Zhilin; Jiao, Qianqian; Ning, Juntao; Dong, Guochen; Zou, Fenghui

doi:10.1016/j.oregeorev.2017.01.012

Cited by 67 publications

(14 citation statements)

References 83 publications

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“…In contrast, in the Northeastern Hunan Au district in the Jiangnan Orogen, the currently discovered Au deposits are considered to be located downstream in the paleohydrogeological framework (Fig. 4d; Deng et al, 2017Deng et al, , 2020Zhou et al, 2021), and therefore the probability of finding significant Au mineralization at depth is considered high. In particular, since this area is located in the epizone, the top 2 km depths may still contain significant amounts of undiscovered epizonal and mesozonal Au deposits as long as other favorable mineralization conditions (e.g., chemical traps in the Neoproterozoic metasedimentary rocks) extend to such depths.…”

Section: Discussion and Implications For Deep Mineral Explorationmentioning

confidence: 99%

“…4d), which forms part of the late Mesozoic to early Cenozoic basin and range like tectonic province in South China due to the roll back of the Pacific plate (Xu et al, 2017). Mineralization mainly took place in early Cretaceous (Deng et al, 2017), and was controlled by reactivation of preexisting structures formed in the Early Paleozoic (Deng et al, 2020;Zhang et al, 2020;. Although the mineralizing fluids may be contributed by various sources including metamorphic fluids in the host rocks, magmatic fluids from nearby Cretaceous granitic intrusions, and meteoric fluids, mantle -derived fluids probably played a critical role both in terms of metal sources and hydrodynamics (Fig.…”

Section: Structurally-controlled Hydrothermal Mineralization Systems ...mentioning

confidence: 99%

“…Although the mineralizing fluids may be contributed by various sources including metamorphic fluids in the host rocks, magmatic fluids from nearby Cretaceous granitic intrusions, and meteoric fluids, mantle -derived fluids probably played a critical role both in terms of metal sources and hydrodynamics (Fig. 4d; Deng et al, 2017;Zhou et al, 2021). Ore-forming fluids were transported along the Changsha-Pingjiang fault and discharged into the surrounding rocks at the upper level (in the epizone), where mixing with reducing fluids enriched in Fe 2+ attracted to suction pumps associated with fracturing in the Neoproterozoic host rocks, and reaction with Fe 2+ -rich lithologies, resulted in sulfidation and precipitation of gold (Fig.…”

Section: Structurally-controlled Hydrothermal Mineralization Systems ...mentioning

confidence: 99%

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Hydrodynamic Links between Shallow and Deep Mineralization Systems and Implications for Deep Mineral Exploration

Chi

Xue

et al. 2022

Acta Geologica Sinica (Eng)

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Deep mineral exploration is increasingly important for finding new mineral resources but there are many uncertainties. Understanding the factors controlling the localization of mineralization at depth can reduce the risk in deep mineral exploration. One of the relatively poorly constrained but important factors is the hydrodynamics of mineralization. This paper reviews the principles of hydrodynamics of mineralization, especially the nature of relationships between mineralization and structures, and their applications to various types of mineralization systems in the context of hydrodynamic linkage between shallow and deep parts of the systems. Three categories of mineralization systems were examined, i.e., magmatic‐hydrothermal systems, structurally controlled hydrothermal systems with uncertain fluid sources, and hydrothermal systems associated with sedimentary basins. The implications for deep mineral exploration, including potentials for new mineral resources at depth, favorable locations for mineralization, as well as uncertainties, are discussed.

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Section: Discussion and Implications For Deep Mineral Explorationmentioning

confidence: 99%

Section: Structurally-controlled Hydrothermal Mineralization Systems ...mentioning

confidence: 99%

Section: Structurally-controlled Hydrothermal Mineralization Systems ...mentioning

confidence: 99%

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Hydrodynamic Links between Shallow and Deep Mineralization Systems and Implications for Deep Mineral Exploration

Chi

Xue

et al. 2022

Acta Geologica Sinica (Eng)

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“…Province showing the tectonic, magmatic and stratigraphic framework as well as the dominant Au-, Cu-and Co (-polymetallic) ore deposits (modified after [23]). …”

Section: Figure 1 (A) Simplified Map Of South China; (B) Geological mentioning

confidence: 99%

Trace Element Analysis of Pyrite from the Zhengchong Gold Deposit, Northeast Hunan Province, China: Implications for the Ore-Forming Process

2018

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The Zhengchong gold deposit is located in the central segment of the Jiangnan Orogen in northeastern Hunan Province, South China. The host rocks of this deposit are the Neoproterozoic slates of the Lengjiaxi Group and granodiorite. The structures in the Zhengchong gold deposit are dominated by NE-trending reverse faults, which control the gold-bearing veins. The orebody consists of NE-trending laminated quartz veins and NW-trending quartz veins. The alteration styles include silicification, carbonatization, sulfidation, sericitization and chloritization. The Zhengchong gold mineralization can be divided into four stages: Quartz-pyrite (stage I), quartz-pyrite-arsenopyrite (stage II), quartz-polysulfide (stage III) and quartz-carbonate (stage IV). Three generations of hydrothermal pyrite were identified: Disseminated euhedral to subhedral cubes in altered wall-rock (PyI), euhedral to subhedral cubes inter-grown with arsenopyrite and tetrahedrite in quartz veins and wall-rock (PyII), and euhedral cubes with microinclusions (native gold, galena, sphalerite, chalcopyrite, tetrahedrite, and pyrrhotite) or metasomatic textures in sulfide-rich veins or veinlets (PyIII). PyII and PyIII are arsenian pyrite and represent the main Au-bearing minerals. PyI records the lowest concentrations of Au; PyII and PyIII record similar amounts of Au, Cu, Pb, Zn, and Bi, but PyIII is more enriched in Co, Ni, Te, and Se. The substitution of As, Se and Te for S and that of Co and Ni for Fe occurs by direct-ion exchange. Invisible gold is uniformly distributed within the arsenian pyrite, and visible gold fills microfractures in PyII or occurs as inclusions in PyIII. Co, Ni, Cu exhibit positive correlations with Au and a negative correlation between Au + Cu + Co + Ni and Fe reflect that Fe vacancies may have been a major cause of the precipitation of invisible Au and other metal elements in pyrite structure. There are systematic trace element differences between the three generations of pyrite (PyI, PyII, PyIII). The more Co, Ni and Se, Te substitution that occurred for Fe and S, respectively, the greater the increase in the Co/Ni ratio (<1) and the decrease in the Se/Te ratio (<10) in stage III, indicating that a more reduced, lower-temperature metamorphic hydrothermal fluid was present in stage III.

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“…Gold deposits hosted by the Lengjiaxi Group occur in quartz veins, altered slates, and breccia within ductile shear zones (e.g., the Wangu [36], Huangjindong, Yanlinshi, and Hongyuan gold deposits [27,37]). Base metal mineralization in vein, skarn, and porphyry-type deposits is associated with I-type granites south of the CPF (Figure 1b) [26], with copper being the dominant mineral resource.…”

Section: Regional Geology Of Northeastern Hunan Provincementioning

confidence: 99%

Indium Mineralization in a Sn-Poor Skarn Deposit: A Case Study of the Qibaoshan Deposit, South China

Liu

2017

Minerals

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Indium (In) is commonly hosted in Sn-rich deposits but rarely reported in Sn-poor deposits. However, an In-rich and Sn-poor skarn deposit, the Qibaoshan Cu-Zn-Pb deposit, has been identified in south China. Geochemical analyses were undertaken on 23 samples representing the following mineral assemblages: sphalerite-pyrite, pyrite-chalcopyrite, pyrite-sphalerite-galena-chalcopyrite, pyrite, magnetite-pyrite, and magnetite. The results show that In is richest in the sphalerite-pyrite ores, with concentrations of 28.9-203.0 ppm (average 122.8 ppm) and 1000 In/Zn values of 2.7-10.9 (average 7.0). Other ore types in the Qibaoshan deposit are In poor, whereas all are Sn poor (10 to 150 ppm), with most samples having Sn concentrations of ≤70 ppm. Indium is mainly hosted by sphalerite, as inferred from the strong correlation between In and Zn, and weak correlation between In and Sn. Mineral paragenetic relationships indicate sphalerite formed from late quartz-sulfide stage of mineralization processes. Indium in the Qibaoshan deposit is richer in vein-type orebodies than in lenticular-type orebodies occurring at contact zones between carbonate and quartz porphyry, or in carbonate xenoliths. Igneous intrusions that were Sn poor and emplaced at shallow depths formed the In-rich orebodies of the Qibaoshan deposit.

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Geology, geochronology, geochemistry and ore genesis of the Wangu gold deposit in northeastern Hunan Province, Jiangnan Orogen, South China

Cited by 67 publications

References 83 publications

Hydrodynamic Links between Shallow and Deep Mineralization Systems and Implications for Deep Mineral Exploration

Hydrodynamic Links between Shallow and Deep Mineralization Systems and Implications for Deep Mineral Exploration

Trace Element Analysis of Pyrite from the Zhengchong Gold Deposit, Northeast Hunan Province, China: Implications for the Ore-Forming Process

Indium Mineralization in a Sn-Poor Skarn Deposit: A Case Study of the Qibaoshan Deposit, South China

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