Elemental Geochemistry Characteristics and Their Geological Significance of Nanxiaoyao Gold Deposit in the Middle of Yishu Fault Zone, Shandong, China(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2018年第01期
- Page:
- 76-90
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Elemental Geochemistry Characteristics and Their Geological Significance of Nanxiaoyao Gold Deposit in the Middle of Yishu Fault Zone, Shandong, China
- Author(s):
- LIU Xiao-tong; MAO Guang-zhou; WANG Xiang-jun; AN Peng-rui; MENG Ling-qiang; SONG Li-guo; HE Tie-liang
- 1. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 2. Key Laboratory of Gold Mineralization Processes and Resource Utilization Subordinated to Ministry of Land and Resources/Key Laboratory of Metallogenic Geological Process and Resources Utilization in Shandong Province, Shandong Institute of Geological Sciences, Jinan 250013, Shandong, China
- Keywords:
- geochemistry; gold deposit; metallogenic material; metallogenic fluid; trace element; sulphur isotope; insitu analysis; Yishu fault zone
- PACS:
- P595；P611.3+1
- DOI:
- -
- Abstract:
- Nanxiaoyao gold deposit, is located in the middle of Yishu fault zone, Shandon, develops the altered type and quartz vein type ores. According to the characteristics of major and trace elements of three types of ores (including greenschist with beresitization, mylonite with pyritization and chloritization, and quartzsulfide vein) and pyrites in Nanxiaoyao gold deposit, the characteristics of metallogenic materials and fluids, tectonic settings and metallogenic mechanism were discussed. The results show that the three types of ores are enriched in Co and Ni, and depleted in REE, indicating that their metallogenic fluids may be all from the deep, and the Eu varies from slightly negative anomaly to positive anomaly, showing that the characteristics of metallogenic fluids may be changed; the ratio of mass fraction of Au to Ag of pyrite is less than 0.5, and As is poor, indicating that the temperature of fluid is high; the formation of all ores may be related to volcanism, and the metallogenic fluid of greenschist with beresitization, and quartzsulfide vein could be from volcanic and subvolcanic activities in Yanshanian; the protoliths of ores may be sedimentary rocks and alkaline intermediatebasic magmatic rocks, and the metallogenic materials of ores may be derived from deep mantle. In conclusion, the metallogenic materials and fluids in Nanxiaoyao gold deposit are all derived from deep; because of the upward with the volcanicmagma activity, the metallogenic environment changes from weak reduction to weak oxidation by blend of meteoric water, enhancing the Au precipitation and forming the distinct gold deposits in different tectonic settings.
Last Update: 2018-03-08