Trace elements including REE (Rare Earth Elements) in fluid inclusions inlherzolite, olivine, orthopyroxene, and clinopyroxene have been determined by heating-decrepitationand ICP-MS (Element Type Inductively Coupled ...Trace elements including REE (Rare Earth Elements) in fluid inclusions inlherzolite, olivine, orthopyroxene, and clinopyroxene have been determined by heating-decrepitationand ICP-MS (Element Type Inductively Coupled Plasma-Mass Spectrometry) method. Normalized CO_2fluid/chondrite data show that mantle fluids are rich in REEs, especially LREEs (Light Rare EarthElements), several times or dozen times higher than mantle rocks and mantle minerals. There areclose relationships among the REE data of olivine, orthopyroxene, clinopyroxene and lherzolite.Compared to the data of chemical dissolution method, it is believed that REE data obtained fromheating-decrepitation and ICP-MS technique are contributed by CO_2 fluid inclusions. About 60percent (mass fraction) of tiny inclusions are observed not to be decrepitated above 1000 deg C, soREE data obtained are only contributed by decrepitated inclusions. Mantle fluids rich in LREE playan important role in mantle metasomatism, partial melting and mineralization.展开更多
The data tree table is a type of data structure consisting of data tree and table, which has a wide field of applications. The visual and dynamic growing algorithm of data tree table and its software method are presen...The data tree table is a type of data structure consisting of data tree and table, which has a wide field of applications. The visual and dynamic growing algorithm of data tree table and its software method are presented based on the theory of the data structure and visual technology of software. The method of the expression and management of data tree table with relational mode are explored.展开更多
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, si...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.展开更多
基金The work was financial support by National Natural Science Foundation of China (No.49972031).]
文摘Trace elements including REE (Rare Earth Elements) in fluid inclusions inlherzolite, olivine, orthopyroxene, and clinopyroxene have been determined by heating-decrepitationand ICP-MS (Element Type Inductively Coupled Plasma-Mass Spectrometry) method. Normalized CO_2fluid/chondrite data show that mantle fluids are rich in REEs, especially LREEs (Light Rare EarthElements), several times or dozen times higher than mantle rocks and mantle minerals. There areclose relationships among the REE data of olivine, orthopyroxene, clinopyroxene and lherzolite.Compared to the data of chemical dissolution method, it is believed that REE data obtained fromheating-decrepitation and ICP-MS technique are contributed by CO_2 fluid inclusions. About 60percent (mass fraction) of tiny inclusions are observed not to be decrepitated above 1000 deg C, soREE data obtained are only contributed by decrepitated inclusions. Mantle fluids rich in LREE playan important role in mantle metasomatism, partial melting and mineralization.
文摘The data tree table is a type of data structure consisting of data tree and table, which has a wide field of applications. The visual and dynamic growing algorithm of data tree table and its software method are presented based on the theory of the data structure and visual technology of software. The method of the expression and management of data tree table with relational mode are explored.
基金This work was supported by the National Science and Technology Development Program of China(Grant No.2003BA612A-06-09)the Doctor Science Foundation of the Minis-try of Education of China(Grant No.20030008018)the Major State Basic Research Program(Grant No.2001CB409806).
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.
