Shandong Jinzhou Mining Industry Group

Rushan, China

Shandong Jinzhou Mining Industry Group

Rushan, China
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Cai Y.,CAS Institute of Geology and Geophysics | Fan H.,CAS Institute of Geology and Geophysics | Hu F.,CAS Institute of Geology and Geophysics | Jang K.,CAS Institute of Geology and Geophysics | And 3 more authors.
Acta Petrologica Sinica | Year: 2011

Hubazhuang gold deposit is a typical pyrite- and polymetallic sulfide-quartz lode deposit in the Muping-Rushan gold belt of Jiaodong Peninsula and gold occurs mainly in pyrite- and polymetallic sulfide-quartz vein. Fluid inclusion studies show that in the different altered wall rocks and gold ores of different mineralization stages there are three major types of fluid inclusions: CO2-rich fluid inclusions, CO2-H2O fluid inclusions and aqueous fluid inclusions. CO2-rich fluid inclusions occur mainly in the early mineralizing stage (stage I): the main mineralizing stage (stage II) contains CO2-H2O fluid inclusions and aqueous fluid inclusions: there are only the aqueous fluid inclusions in the late mineralizing stage (stage III). Microthermometric study shows that in stage I the homogenization temperatures and salinities range respectively from 260°C to 360°C and 1.0% to 7.4% NaCleqv, and stage II the range is 180°C to 269°C and 1. 7 to 13. 1% NaCleqv, then stage III is 104°C to 189°C and 0. 9% to 8. 8% NaCleqv. The fluids in stage I were medium-high temperature, volatile-rich and low salinity fluid system. During stage II the fluids evolved to a CO2-H2O-NaCl fluid system with medium-low temperature, low volatile and wide range of salinity. Finally in stage III the temperature, salinity and volatile content all decreased. The study of hydrogen and oxygen stable isotope indicates that in stage I the mineralizing fluids were mainly magmatic water, but during stage II the mineralizing fluids were mixed fluids which originated mainly from meteoric water. Sulfur isotope of the main mineralizing stage reveals that ore-forming materials may mainly come from the wall rocks which were leached by the meteoric water. Temperature decline and fluid immiscibility are the main reason of the gold precipitation. Rb-Sr isochron of sericite in altered rocks shows that the mineralizing age of Hubazhuang gold deposit is 126.5 ± 5.6Ma.


Zhou Q.,China University of Geosciences | Zhou Q.,CAS Institute of Geology and Geophysics | Zhou Q.,University of Chinese Academy of Sciences | Li S.,China University of Geosciences | And 5 more authors.
Acta Petrologica Sinica | Year: 2011

Based on electron probe micro-analysis (EPMA), hessite and tetradymite are found in the Yinggezhuang gold deposit, and tsumoite found the first time in Jiaodong district also occurs in the Yinggezhuang gold deposit, one part of the Mouping-Rushan ore belt, Jiaodong. These telluride minerals intergrowing with each other in fine flakes occur in the inter-crystal poroses of dolomite and quartz. The lower contents of tellurium in the telluride minerals studied are revealed by the results of EPMA. The precipitation sequence of telluride minerals and their paragenetic minerals is pyrite→pentlandite→ tetradymite→tsumoite→hessite according to the occurrence and component of the mineral association. When telluride minerals precipitated, the range of log fTo2 is from - 19. 5 to ∼ 11.2 and the upper limit of log fs2 is - 16. 8, confined by the mineral assemblages. The origin of tellurium discussed implies that the occurrence of telluride minerals in gold deposits may show the information of mantle origin. According to the geochemical relation of tellurium and gold, the wall rocks of the Yinggezhuang gold deposit, including Jingshan Group and Kunyushan complex, are not likely to supply ore substance and the gold metallogenesis is involved in the tectonic-magmatic activity of the Early Cretaceous stage, especially the exchange process of crust-mantle material.


Lan T.,CAS Institute of Geology and Geophysics | Fan H.,CAS Institute of Geology and Geophysics | Hu F.,CAS Institute of Geology and Geophysics | Yang K.,CAS Institute of Geology and Geophysics | And 4 more authors.
Acta Petrologica Sinica | Year: 2010

Shicheng gold deposit, located in the Muping-Rushan gold belt of Jiaodong Peninsula, is a typical polymetallic sulphide gold deposit Fluid inclusions studies show that three stages of inclusions which CO2-rich inclusions formed at the first stage, H2O and CO2-bearing inclusions formed at the second stage and only H2O inclusions formed in the third stage can be identified. The homogenization temperatures and salinities ranging from 256°C to 360°C and 3. 7% NaCl to 6. 9% NaCl for the first stage represent the character of the ore-forming fluid in the early time, 168°C to 270°C and 4. 49% NaCl to 10. 24% NaCl for the second stage represent the property of the main ore-forming fluid, and 1231 to 178t and 0.4% NaCl to 7. 6% NaCl for the third stage reflect the property of the ore-forming fluid in the late time. Hydrogen and oxygen stable isotopes indicate that the main ore-forming fluid of the Shicheng gold deposit is the result of mixing between magmatic fluid and meteoric water, while carbon stable isotopes imply that CO2-rich mantle fluid was involved in the ore forming process, and sulfur stable isotopes further reveal that the aurum came from the source induced by mantle-crust interaction. The appearance of Shicheng gold deposit indicates that at least two mineralization events exist in the research area. The earlier one characterized by pyrite-quartz ore happened at the age of about 120Ma and the later one characterized by polymetallic sulphide ore occurred younger than 111 Ma.

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