A newly Found Biotite Syenogranite in the Huangshaping Polymetallic Deposit, South China: Insights into Cu Mineralization

作     者：Weicheng Jiang Huan Li Jinghua Wu Zhekai Zhou Hua Kong Jingya Cao 

作者机构：Faculty of Earth Resources State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-Physics Central South University CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2018年第29卷第3期

页      面：537-555页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0704[理学-天文学] 

基　　金：co-financed by the National Natural Science Foundation of China (Nos. 41502067, 41672074) the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (No. CUG150612) 

主　　题：zircon U-Pb dating Hf isotope A-type granite southern Hunan. 

摘      要：The W-Sn-Mo-Cu-Pb-Zn polymetallic mineralization in the Huangshaping Deposit is associated with different types of Jurassic granitic intrusions such as quartz porphyry, granophyre and granite porphyry. In this study, we carried out detailed mineralogical, petrological, geochemical, zircon U-Pb geochronological and Hf isotopic studies on a newly found, Cu-mineralization-related finegrained biotite syenogranite at Huangshaping. This syenogranite is mainly composed of quartz （40%）, K-feldspar （30%）, plagioclase （15%） and biotite （5%）, enriching in SiO2 （75.58 wt.%-76.02 wt.%）, K20 （5.24 wt.%-5.78 wt.%）, AI203 （12.23 wt.%-12.46 wt.%）, Rb （405 ppm-504 ppm）, U （18.5 ppm-40.7 ppm）, Th （47 ppm-52.3 ppm）, Nb （49.6 ppm-57.5 ppm）, and Cu （54 ppm-288 ppm） whereas depleting in P205 （0.01 wt.%）, TiO2 （0.05 wt.%-0.06 wt.%）, Ba （5 ppm-13.1 ppm）, Sr （6.8 ppm-23.9 ppm） and Eu （0.04 ppm-0.05 ppm）, with A1-type alkaline granite characteristics. Magmatic and hydrothermal zircons were separated from a Cu-mineralized syenogranite sample and yielded the ^206Pb/^238U concordant ages of 156.5±1.8 and 154.4±2.9 Ma, representing the intrusive age of the pluton and probable Cu-mineralization time at the Huangshaping Deposit, respectively. Zircon Hf isotopes suggest a crust-derived （partial melting of Paleoproterozoic basement） magma for the syenogranite, with some degree of crust-mantle interaction. We infer that the syenogranite is a transitional phase between the granophyre and the granite porphyry, not only contributed greatly to the Cu mineralization but also provided W-Sn polymetallic ore-forming metals for the Huangshaping Deposit.