抄録
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.
| 元の言語 | 英語 |
|---|---|
| ジャーナル | Geological Journal |
| DOI | |
| 出版物ステータス | 出版済み - 1 1 2019 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Geology
これを引用
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. / Li, Huan; Palinkaš, Ladislav A.; Evans, Noreen J.; Watanabe, Koichiro.
：: Geological Journal, 01.01.2019.研究成果: ジャーナルへの寄稿 › 記事
}
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.
UR - http://www.scopus.com/inward/record.url?scp=85063258685&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85063258685&partnerID=8YFLogxK
U2 - 10.1002/gj.3505
DO - 10.1002/gj.3505
M3 - Article
JO - Geological Journal
JF - Geological Journal
SN - 0072-1050
ER -