| 1 | Pure CO_(2) fluids in the Sarekoubu gold deposit at southern margin of Altai Mountains in Xinjiang,West China显示文摘Sarekoubu gold deposit occurs in metamor- phosed acid volcanic rocks and volcaniclastic rocks of Devo- nian Kangbutiebao Formation along the southern margin of Altai Mountains in Xinjiang, West China. Pyritization, silici- fication and carbonatization are developed in wallrocks, and main gold mineralization stages are pyrite-quartz stage (Ⅱ) and polymetallic sulfide stage (Ⅲ). Primary fluid inclusions are often seen in main gold mineralization stages, which are almost pure CO2 liquid inclusions (LCO2) under room tem- perature with high densities of 0.85—1.07 g/cm3. CO2-rich inclusions (LCO2-LH2O) and H2O-rich inclusions (LH2O-LCO2) are subordinate. Fluid inclusions in stage Ⅰ (polymetallic sulfide stage) are more complex than in stage Ⅱ, containing CO2-CH4 system with ?78.1—?61.9℃of solid CO2 melting temperatures and ?33.7—?17.7℃ of partial homogenization temperatures. The trapping pressures of high densities are estimated to be 150—350 MPa. Laser Raman microprobe was used to confirm the composition of pure CO2 liquid in- clusions. δ C values of CO2 inclusions range from ?10.73‰ 13 to ?21.15‰, which are similar to some of fluids in the man- tle-derived minerals that contain surface organic carbon by subduction recycling. These characteristics differ from many hydrothermal gold deposits. CO2 fluids have a regiona source related to post-collisional orogeny. | XUJiuhua DINGRufu XIEYuling ZHONGChanghua YUANXu | 2005 | Chinese Science Bulletin2005，50，4： | 21 |
| 2 | Dating and Fluid Geochemistry of the Sarkobu Gold Deposit in Altay, Xinjiang, China显示文摘The dating of fluid inclusions of quartz yields an Ar-Ar isochrone age of 320.4±6 Ma. Three types of fluid inclusions have been identified with the homogenization temperature ranging from 157℃ to 362℃. The homogenization temperature consists of two groups. The first group varies from 157℃ to 166℃, and the second from 232℃ to 362℃.Their chemical composition is dominated by Na+-Ca2+-Mg2+ and Cl-. The relative concentration of ions is characteristic by Na+>Ca2+>K+>Mg2+ and C1->SO42-> F-. The δD and δ180 values indicate that the ore-forming fluid originates from mixing of multi-source water. The Sarkobu gold deposit has experienced two mineralization stages: gold was enriched during the volcanic-exhalative-sedimentary process in the early stage, while the gold deposit was finally formed under compression-shearing during the orogenic period. | DINGRufu WANGJingbin ZHAOLunshan MAZhongmei ZHANGJinhong | 2004 | Acta Geologica Sinica(English Edition)2004，78，2： | 1 |
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