TY - JOUR
T1 - Zircon morphology, geochronology and trace element geochemistry of the granites from the Huangshaping polymetallic deposit, South China
T2 - Implications for the magmatic evolution and mineralization processes
AU - Li, Huan
AU - Watanabe, Koichiro
AU - Yonezu, Kotaro
N1 - Funding Information:
This work was supported by the China Scholarship Council (CSC) and by the Global Center of Excellence (G-COE) in Novel Carbon Resource Sciences, Kyushu University . Fieldwork was supported by the Huangshaping Mine, Hunan, China . We thank Prof. Hua Kong (Central South University) for his kind supervision in field sampling, and Dr. Quan-zhong Li (Hefei University of Technology) for his technical assistance in LA-ICP-MS analysis. Dr. Svetoslav Georgiev and one anonymous reviewer are thanked for the detailed and valuable comments that helped us to improve the manuscript. Special thanks are due to Dr. Jillian Aira S. Gabo (Kyushu University) and Dr. Franco Pirajno (Editor-in-Chief) for their help in polishing the final manuscript.
PY - 2014/7
Y1 - 2014/7
N2 - The Huangshaping polymetallic deposit is a large-scale deposit located in the central Nanling region, South China. Different types of mineralization have been classified in the area, which are attributed to three types of granitoids from the composite granitic pluton: quartz porphyry, granophyre and granite porphyry. In order to study the magmatic genesis and evolutionary process, as well as constrain the crystallization and mineralization events, 100 zircon separates from different intrusive stages of the pluton have been analyzed for trace element contents and U-Pb isotopic concentrations. The results show that zircons from the Huangshaping granitoids are enriched in Th, U, Hf, Ti, REE and other trace elements, indicating hydrothermal fluid alteration and transformation. Additionally, there is a large variation between different types of granitoids in terms of trace element concentrations. Compared to the zircons from the quartz porphyry and the granophyre, zircons from the granite porphyry are more enriched in Th, U, Hf, Ti, and P but strongly depleted in Eu. This suggests that the magma that formed the granite porphyry possessed higher temperatures, possibly experienced stronger crystal fractionation and originated from a more evolved, complex magmatic source region with higher degree of crustal maturity. Combined with characteristics of crystal morphology and internal texture, hydrothermal zircons were distinguished from magmatic zircons in each granitoid to reveal mineralization processes. The U-Pb geochronology results show that there are two major stages of mineralization: ~. 190. Ma weak Cu (Pb, Zn) mineralization related to the quartz porphyry and the granophyre, and ~. 155. Ma strong W, Sn (Mo, Pb, Zn) mineralization associated with the granite porphyry. Compositions of these hydrothermal zircons suggest that the earlier stage mineralization could be close to single, relatively cold, reduced and quickly ascended fluids, whereas the later stage might be related to hot, oxidized, strongly fractionated and highly evolved, mixed fluids. This study also indicates that hydrothermal zircons from typical composite granitic plutons could be a good tool to reveal the multi-stage magmatic and mineralization process in middle to late Jurassic South China.
AB - The Huangshaping polymetallic deposit is a large-scale deposit located in the central Nanling region, South China. Different types of mineralization have been classified in the area, which are attributed to three types of granitoids from the composite granitic pluton: quartz porphyry, granophyre and granite porphyry. In order to study the magmatic genesis and evolutionary process, as well as constrain the crystallization and mineralization events, 100 zircon separates from different intrusive stages of the pluton have been analyzed for trace element contents and U-Pb isotopic concentrations. The results show that zircons from the Huangshaping granitoids are enriched in Th, U, Hf, Ti, REE and other trace elements, indicating hydrothermal fluid alteration and transformation. Additionally, there is a large variation between different types of granitoids in terms of trace element concentrations. Compared to the zircons from the quartz porphyry and the granophyre, zircons from the granite porphyry are more enriched in Th, U, Hf, Ti, and P but strongly depleted in Eu. This suggests that the magma that formed the granite porphyry possessed higher temperatures, possibly experienced stronger crystal fractionation and originated from a more evolved, complex magmatic source region with higher degree of crustal maturity. Combined with characteristics of crystal morphology and internal texture, hydrothermal zircons were distinguished from magmatic zircons in each granitoid to reveal mineralization processes. The U-Pb geochronology results show that there are two major stages of mineralization: ~. 190. Ma weak Cu (Pb, Zn) mineralization related to the quartz porphyry and the granophyre, and ~. 155. Ma strong W, Sn (Mo, Pb, Zn) mineralization associated with the granite porphyry. Compositions of these hydrothermal zircons suggest that the earlier stage mineralization could be close to single, relatively cold, reduced and quickly ascended fluids, whereas the later stage might be related to hot, oxidized, strongly fractionated and highly evolved, mixed fluids. This study also indicates that hydrothermal zircons from typical composite granitic plutons could be a good tool to reveal the multi-stage magmatic and mineralization process in middle to late Jurassic South China.
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U2 - 10.1016/j.oregeorev.2013.12.009
DO - 10.1016/j.oregeorev.2013.12.009
M3 - Article
AN - SCOPUS:84896780703
VL - 60
SP - 14
EP - 35
JO - Ore Geology Reviews
JF - Ore Geology Reviews
SN - 0169-1368
ER -