| 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 |
| |
| 作者姓名： | LIU Ye LAI Jianqing XIAO Wenzhou Dick JEFFREY DU Rijun LI Shuanglian LIU Chaoyun WEN Chunhu YU Xiaohang |
| |
| 基金项目： | We thank the editor Ziguo Hao and anonymous reviewers for their constructive sugguestions. This study was financially supported by the Key R&D Program of China (Grant No. 2017YFC0602402)，the Innovation-driven Plan of Central South University, China (Grant No. 2015CX008), the China Postdoctoral Science Foundation (Grant No. 2017M622597), Open Research Fund Program of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education (Grant No. 2019YSJS23) and the Natural Science Foundation of Hunan Province (Grant No. 2017JJ3138). |
| |
| 摘 要： | 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.
|
| 修稿时间： | 2018/12/8 0:00:00 |
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 |
| |
| Authors: | LIU Ye LAI Jianqing XIAO Wenzhou Dick JEFFREY DU Rijun LI Shuanglian LIU Chaoyun WEN Chunhua and YU Xiaohang |
| |
| Institution: | 1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
2 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China,3 Hunan Institute of Geological Survey, Changsha 410116, China and 4 College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China |
| |
| 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. |
| |
| Keywords: | zircon U-Pb dating mineral composition A-type granite rare metal mineralization Jinjiling pluton Pangxiemu pluton |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |
|
