Shandong Rushan gold England village and the deep causes of long-term study of mineralogy

Title: Shandong Rushan gold England village and the deep causes of long-term study of mineralogy
　　Author: Zhou Qifeng
　　Degree-granting units: China University of Geosciences (Beijing)
　　Keywords: Genesis;; genesis;; England Village gold;; Jiaodong
　　Summary:
　　England village in the Jiaodong gold Muping - Rushan gold mineralization belt in the southern, output in the Jingshan Group and Kunyushan igneous contact zone, the yellow iron ore quartz vein type gold deposits. This includes four gold veins, the main ore body by the NNE-trending faults control Jinniushan average gold grade of 4.32 × 10-6.
　　Ore types with quartz and pyrite polymetallic sulfide ore based. Mineral composition of ores and other metal sulfide minerals pyrite, quartz and carbonate minerals. Ore structure to granular structure of the main structure and fragmentation, ore massive structure constructed, disseminated and vein-like structure constructed based. Gold minerals include gold and Neodymium magnets silver gold and silver mines, to wrap gold, gold intergranular fracture as the main gold occurrence form. Pyrite mineralization is divided into British, quartz, pyrite, sulphides and quartz carbonate four stages. Wall-rock alteration types include K-feldspar, albitization, sericitization, phyllic alteration, silicification, pyritization, and chloritization of carbonate rocks.
　　Pyrite crystal in this area to its pentagonal dodecahedron and the octahedron and the cube-shaped poly mainly from shallow to deep, from early stage to the main ore-forming stage, poly-shaped crystal growth and crystal deformation complex, indicating that the system sulfur fugacity increases, the temperature is relatively higher. Major element composition analysis results for the overall poor pyrite sulfur, hydrothermal pyrite in the main. Trace element analysis reveals England village to magmatic-hydrothermal ore-forming hydrothermal-based, early stage of ore formation in the role of the old rock. Geochemical analysis of pyrite REE patterns for the right-wing type, the main ore stage pyrite REE patterns are basically the same. Thermal coefficient of pyrite range -346.1 ~ 342.7μν / ℃, thermal conductivity for the P-type multi-mixed with N-type, P-type occurrence rate averaged 64%. South, North, P-type wells pyrite deposits that occur south of the relative uplift rate. P-and N-type pyrite crystallization temperature is 148.9 ℃, respectively, the mean and 349.1 ℃. According to the P-type region of occurrence of pyrite and gold grade changes consistency, suggesting that I, P-type ore bodies http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php occur from south to north the rate of the deep depression, II-1 and II-3 ore ore-forming deep good prospects.
　　Stable isotopes of ore minerals in this area (He, Pb, and S) analysis showed that the shell-forming fluids is the main source of the crust-mantle mixing fluids, into minerals mainly from the lower crust and a small amount of mantle-derived material, and a rock Jingshan Group formation of the join. HO isotope analysis showed that the quartz ore-forming fluids of magmatic water and meteoric water mixed fluid. Analysis of fluid inclusions in quartz test that England village into a gold mine for the low temperature in the low salinity shallow hydrothermal gold ore-forming fluids in general are Na + (K +) - (Ca2 +)-Cl-(SO42-) type, gas dominated by gas water composition, followed by CO2, H2 and a small amount of CO, CH4, and N2, the main ore-forming fluid phase as a weak acid, was to restore nature.
　　Degree Year: 2010