Zircon geochronology and geochemistry of the Xianghualing A-type granitic rocks: Insights into multi-stage Sn-polymetallic mineralization in South China

Li, Huan; Wu, Jianfei; Evans, Noreen J.; Jiang, Weicheng; Zhou, Zhe-Kai

doi:10.1016/j.lithos.2018.05.001

Cited by 98 publications

(32 citation statements)

References 74 publications

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“…The third episode of magmatism and ore formation has been rarely reported in the Nanling Range (Cai et al, ), though we have found ~80 Ma zircons in the Xianghualing Sn polymetallic deposits (Li, Wu, et al, ). However, the Cretaceous (~80 Ma) hydrothermal event that corresponds to some world‐class Sn–W polymetallic deposits has been reported from other parts of South China (Figure ), such as the Gejiu Sn polymetallic ore field in southern Yunnan Province (82.7 ± 0.7 Ma, muscovite 40 Ar– 39 Ar age; Cheng, Mao, & Yang, ); the Yingwuling W–Sn polymetallic mineralization in western Guangdong Province (79–81 Ma, LA‐ICPMS cassiterite and zircon age; Zheng, Mao, Zhao, Zhao, & Yu, ; Zhang et al, ); the Xishan Sn–W deposit in western Guangdong Province (79.4 ± 4.5 Ma, molybdenite Re–Os isochron age; Zhang et al, ); and the Yinyan Sn deposit in western Guangdong Province (78–80 Ma, molybdenite Re–Os model ages; Zheng, Mao, et al, ).…”

Section: Discussionmentioning

confidence: 48%

Mesozoic multi‐stage W–Sn polymetallic mineralization in the Nanling Range, South China: An example from the Dengfuxian–Xitian ore field

Sun

Algeo

et al. 2018

Geological Journal

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The Dengfuxian and Xitian ore fields, located in the central Nanling Range of South China, are characterized by multi‐stage W–Sn polymetallic mineralization. In this study, whole‐rock and zircon compositions in altered granites from four typical deposits in these ore fields (i.e., Dalong Pb–Zn, Xiangdong W, Gaolong fluorite, and Shaiheling Sn–Pb–Zn) were studied to constrain their fluid chemistry and mineralization history. Compared to unaltered granites at Dengfuxian and Xitian, these fluid‐altered granites are characterized by more variable SiO2 (64.2–78.4%) and lower TiO2 (0.02–0.12%), CaO (0.25–1.2%), and Na2O (0.31–2.6%) concentrations, lower ΣREE (87–156 ppm), and higher Zr/Hf (11.1–31.6) and Y/Ho (31.1–53.4) ratios, suggesting intense F‐rich fluid metasomatism. Zircon cathodoluminescence (CL), transmitted light and back‐scattered electron (BSE) imaging, laser ablation multi‐collector inductively coupled plasma mass spectrometry (LA‐MC‐ICP‐MS) trace‐element analysis, U–Pb dating, and Hf isotopes revealed a sequence of three W–Sn polymetallic mineralization stages: a Triassic stage (~220 Ma), a Jurassic stage (~150 Ma), and a Cretaceous stage (~80 Ma). The Triassic episode was associated with a highly fractionated granitic magma derived from the lower crust and contaminated by basement rocks; the magmatic fluid was affected by a high 176Hf/177Hf component from the ~770‐Ma basement and probably precipitated under high F and high fO2 conditions. The Jurassic episode was related to mantle–crust interaction and resulted in large‐scale W–Sn mineralization at decreased fO2. The Cretaceous episode was marked by Sn mineralization in a lithospheric extensional setting. We infer that basement rocks were the major source of metals for the world‐class W–Sn ore deposits in the Nanling Range of South China. This study also demonstrates that whole‐rock geochemistry of hydrothermally altered granites in combination with Lu–Hf isotopic, U–Pb dating, and trace element analyses of magmatic and hydrothermal zircons can be a useful approach to recognition of multi‐stage magmatic and mineralization processes.

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Section: Discussionmentioning

confidence: 48%

Mesozoic multi‐stage W–Sn polymetallic mineralization in the Nanling Range, South China: An example from the Dengfuxian–Xitian ore field

Sun

Algeo

et al. 2018

Geological Journal

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“…In addition, the SiO2 contents of skarn samples from different deposits show distinct linear trends with other oxides, such as Al2O3, total Fe, MnO and CaO ( Figure 6). [24,44,68,76]. Data for the strata are from [31,77].…”

Section: Resultsmentioning

confidence: 99%

“…Strata composition of the Shidengzi Formation Carboniferous limestone are reference from [31], Devonian mudstone and shale composition are reference from [77]. Granite composition of the Huangshaping granite porphyry are reference from [24], Shizhuyuan equigranular biotite granite are reference from [44,68], Xianghualing albite granite are reference from [76]. Normalized values for primitive mantle are from [78].…”

Section: Resultsmentioning

confidence: 99%

Metal Sources of World-Class Polymetallic W–Sn Skarns in the Nanling Range, South China: Granites versus Sedimentary Rocks?

Jiang

Evans

et al. 2018

Minerals

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Widespread, large-scale polymetallic W-Sn mineralization occurs throughout the Nanling Range (South China) dated 160-150 Ma, and related to widely developed coeval granitic magmatism. Although intense research has been carried out on these deposits, the relative contribution of ore-forming elements either from granites or from surrounding strata is still debated. In addition, the factors controlling the primary metallogenic element in any given skarn deposit (e.g., W-dominated or Sn-dominated) are still unclear. Here, we select three of the most significant skarn-deposits (i.e., Huangshaping W-Mo-Sn, Shizhuyuan W-Sn-Mo-Bi and Xianghualing Sn), and compare their whole-rock geochemistry with the composition of associated granites and strata. The contents of Si, Al and most trace elements in skarns are controlled by the parent granite, whereas their Fe, Ca, Mg, Mn, Ti, Sr and REE patterns are strongly influenced by the wall rock. Samples from the Huangshaping skarn vary substantially in elemental composition, probably indicating their varied protoliths. Strata at the Shizhuyuan deposit exerted a strong control during metasomatism, whereas this occurred to a lesser degree at Huangshaping and Xianghualing. This correlates with increasing magma differentiation and increasing reduction state of granitic magmas, which along with the degree of stratigraphic fluid circulation, exert the primary control on dominant metallogenic species. We propose that wall rock sediments played an important role in the formation of W-Sn polymetallic mineralization in South China.

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“…Granitoids that experienced intense fluid–rock interaction or metasomatism possess significantly modified 87 Rb/ 86 Sr and 87 Sr/ 86 Sr ratios (Chen et al, ; Li, Wu, et al, ). The Sr content of the mineralized granite porphyry is very low (5.81–26.98 ppm), and their 87 Sr/ 86 Sr ratios are potentially sensitive to fluid–rock interaction.…”

Section: Discussionmentioning

confidence: 99%

“…The Huangshaping polymetallic deposit is located close to Chenzhou City in the southern Hunan Province (Figure ). The South Hunan W–Mo–Cu–Pb–Zn ore belt is the most important part of the Nanling tectono‐magmatic belt in South China, which hosts complex geologic structures, experienced multiple magmatic events (Kong et al, ; Mao, Cheng, Chen, & Pirajno, ), and has a rich base‐metal and nonferrous metal mineral resources (Jiang, Li, Evans, Wu, & Cao, ; Li, Sun, et al, ; Li, Palinkaš, Watanabe, & Xi, ; Li, Wu, Evans, Jiang, & Zhou, ; Liu et al, ; Wu, Li, Algeo, Jiang, & Zhou, ). Caledonian movement resulted in metamorphism of Cambrian–Sinian sedimentary rocks and folding and uplift of the basement in South Hunan.…”

Section: Outline Of Geology and Ore Depositsmentioning

confidence: 99%

Genesis of the Huangshaping W–Mo–Cu–Pb–Zn deposit, South China: Role of magmatic water, metasomatized fluids, and basinal brines during intra‐continental extension

Palinkaš

Evans

et al. 2019

Geological Journal

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The Huangshaping world‐class W–Mo–Cu–Pb–Zn deposit formed during Jurassic intra‐continental extension in the central Nanling region (South Hunan), South China. In order to assess the role of fluids in ore genesis and the origin of polymetallic mineralization, three types of mineralized porphyries (quartz porphyry, granophyre, and granite porphyry) were studied. The multi‐method approach included whole‐rock Sr–Nd isotopic geochemistry and determination of the trace element content and gaseous and aqueous composition of ore minerals from the three stages of intrusion and ore emplacement. Geochemical results show that the Sr–Nd isotopes in these altered porphyries were strongly affected by fluid metasomatism. The 87Sr/86Sr and 147Sm/144Nd ratios for the quartz porphyry and granophyre range from 0.72894 to 0.83093 and 0.1524 to 0.2080, respectively, whereas higher and considerably more variable ratios were determined for the granite porphyry (0.90396 to 1.51943 and 0.2391 to 0.2914). These observations imply that granite porphyry‐associated W–Mo mineralization underwent more intensive fluid–rock interaction. The relatively low REE concentrations and high abundances of CH4 and H2 in the Cu ores associated with the quartz porphyry unambiguously suggest a deep‐sourced magmatic fluid for the Cu mineralization. The high REE concentrations, pronounced negative Eu anomalies, M‐type tetrad effects, and high CO2, H2O, and Ca2+ contents of the W–Mo ores associated with the granite porphyry imply that the W–Mo polymetallic mineralization was formed in a relatively oxidizing, high‐temperature environment with strong metasomatism. In contrast, the slightly negative Eu anomalies, W‐type tetrad effects, low CH4, and high F− and Cl− concentrations of the Pb–Zn ores indicate involvement of a sediment‐derived basinal brine and reducing mineralization conditions. Collectively, a three‐stage genetic model is proposed for the Huangshaping polymetallic deposit. Corresponding to initiation, development, and cessation of Jurassic intra‐continental extension, magmatic water, metasomatized fluids, and basinal brines played key sequential roles in Cu, W–Mo, and Pb–Zn mineralization.

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Zircon geochronology and geochemistry of the Xianghualing A-type granitic rocks: Insights into multi-stage Sn-polymetallic mineralization in South China

Cited by 98 publications

References 74 publications

Mesozoic multi‐stage W–Sn polymetallic mineralization in the Nanling Range, South China: An example from the Dengfuxian–Xitian ore field

Mesozoic multi‐stage W–Sn polymetallic mineralization in the Nanling Range, South China: An example from the Dengfuxian–Xitian ore field

Metal Sources of World-Class Polymetallic W–Sn Skarns in the Nanling Range, South China: Granites versus Sedimentary Rocks?

Genesis of the Huangshaping W–Mo–Cu–Pb–Zn deposit, South China: Role of magmatic water, metasomatized fluids, and basinal brines during intra‐continental extension

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