Petrogenesis and Mineralization of Two-Stage A-Type Granites in Jiuyishan, South China: Constraints from Whole-rock Geochemistry, Mineral Composition and Zircon U-Pb-Hf Isotopes
Ye LIU
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorCorresponding Author
Jianqing LAI
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Corresponding author. E-mail: [email protected]; [email protected]Search for more papers by this authorCorresponding Author
Wenzhou XIAO
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Corresponding author. E-mail: [email protected]; [email protected]Search for more papers by this authorDick JEFFREY
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorRijun DU
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorShuanglian LI
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorChaoyun LIU
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorChunhua WEN
Hunan Institute of Geological Survey, Changsha 410116 China
Search for more papers by this authorXiaohang YU
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074 China
Search for more papers by this authorYe LIU
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorCorresponding Author
Jianqing LAI
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Corresponding author. E-mail: [email protected]; [email protected]Search for more papers by this authorCorresponding Author
Wenzhou XIAO
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Corresponding author. E-mail: [email protected]; [email protected]Search for more papers by this authorDick JEFFREY
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorRijun DU
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorShuanglian LI
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorChaoyun LIU
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083 China
School of Geosciences and Info-Physics, Central South University, Changsha 410083 China
Search for more papers by this authorChunhua WEN
Hunan Institute of Geological Survey, Changsha 410116 China
Search for more papers by this authorXiaohang YU
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074 China
Search for more papers by this authorAbout the first author:
LIU Ye, female, born in 1994, postgraduate student of School of Geosciences and Info-Physics, Central South University, majored in Geological Resources and Geological Engineering. Email: [email protected]
About the corresponding author:
LAI Jianqing, male, born in 1964, professor of School of Geosciences and Info-Physics, Central South University. He is interested in the study of petrology, mineral deposits and fluid inclusions. Email: [email protected]
XIAO Wenzhou, male, born in 1991, PhD student of School of Geosciences and Info-Physics, Central South University. He is interested in the study of granitoid rocks, rare metal deposits and zircons. Email: [email protected]
Abstract
The Jiuyishan complex massif, located in the northern section of the Nanling region, is a combination of five plutons, namely, the Xuehuading, Jinjiling, Pangxiemu, Shaziling and Xishan plutons. Whole-rock geochemistry, mineral electron microprobe analysis, zircon U-Pb dating and Hf isotope analysis were carried out for the Jinjiling and Pangxiemu plutons. The zircon U-Pb dating yields weighted mean ages of 152.9±0.9 Ma for the Jinjiling pluton and 151.7±1.5 Ma for the Pangxiemu pluton, with a narrow gap between them. The Jinjiling and Pangxiemu plutons both have geochemical characteristics of high SiO2, Al2O3, Na2O, K2O and low TiO2, MgO, CaO, P2O5 contents, with intense depletionS in Sr, Ba, Ti, Eu and enrichments in Ga, FeOT and HFSE, and these characteristics reflect an A-type affinity. From the Jinjiling to the Pangxiemu plutons, the mineral composition of mica changes from lepidomelane to zinnwaldite, with increases in F, Li2O and Rb2O contents. The mineral composition of zircon changes from low Zr/Hf to high Zr/Hf, with increasing HfO2, P2O5 and UO2+ThO2+Y2O3 contents. The mineral compositions of feldspar indicate that the Pangxiemu pluton contains more alkali feldspar than the Jinjiling pluton. The whole-rock geochemistry and mineral compositions reveal a higher degree of differentiation for the Pangxiemu pluton. The nearly uniform εHf(t) indicates the same source region for the two plutons: both were derived from partial melting of the lower crust, with small contributions of mantle materials. In addition, higher F, lower Nb/Ta and Zr/Hf ratios in the Pangxiemu Pluton suggest a closer relationship with the rare metal mineralization than for the Jinjiling pluton.
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