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

Huan Li, Ladislav A. Palinkaš, Noreen J. Evans, Koichiro Watanabe

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Abstract

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 87 Sr/ 86 Sr and 147 Sm/ 144 Nd 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 CH 4 and H 2 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 CO 2 , H 2 O, and Ca 2+ 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 CH 4 , 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.

Original languageEnglish
JournalGeological Journal
DOIs
Publication statusPublished - Jan 1 2019

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porphyry
mineralization
fluid
granite
granophyre
water
quartz
metasomatism
rare earth element
Jurassic
anomaly
ore mineral
brine
emplacement
geochemistry
ore
trace element
isotope
rock
sediment

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

@article{7b50f7be957c4142bc56e26b8d375625,
title = "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",
abstract = "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 87 Sr/ 86 Sr and 147 Sm/ 144 Nd 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 CH 4 and H 2 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 CO 2 , H 2 O, and Ca 2+ 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 CH 4 , 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.",
author = "Huan Li and Palinkaš, {Ladislav A.} and Evans, {Noreen J.} and Koichiro Watanabe",
year = "2019",
month = "1",
day = "1",
doi = "10.1002/gj.3505",
language = "English",
journal = "Geological Journal",
issn = "0072-1050",
publisher = "John Wiley and Sons Ltd",

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TY - JOUR

T1 - Genesis of the Huangshaping W–Mo–Cu–Pb–Zn deposit, South China

T2 - Role of magmatic water, metasomatized fluids, and basinal brines during intra-continental extension

AU - Li, Huan

AU - Palinkaš, Ladislav A.

AU - Evans, Noreen J.

AU - Watanabe, Koichiro

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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 87 Sr/ 86 Sr and 147 Sm/ 144 Nd 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 CH 4 and H 2 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 CO 2 , H 2 O, and Ca 2+ 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 CH 4 , 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.

AB - 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 87 Sr/ 86 Sr and 147 Sm/ 144 Nd 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 CH 4 and H 2 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 CO 2 , H 2 O, and Ca 2+ 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 CH 4 , 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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