Daytime and nighttime aerosol samples for total suspended particles (TSP) were collected in Chengdu from 12 to 23 January 2013 (winter) and 10 to 21 August 2014 (summer). The mass concentrations of TSP, major inorgani...Daytime and nighttime aerosol samples for total suspended particles (TSP) were collected in Chengdu from 12 to 23 January 2013 (winter) and 10 to 21 August 2014 (summer). The mass concentrations of TSP, major inorganic ions, and stable sulfur isotope ratios were determined. Clear winter-summer variatio n inT SPwas observed;the mass concentrations ofTSPin summerwere below levels defi ned by the Chinese National Ambient Air Quality Standard (GB3095-2012), whereas winter TSP levels exceeded the standard by 2-4 times. Overall, the sum of SO4^2-, NO3^-, and NH4^+ concentmtions represented the highest contribution to water-soluble ionic components, which showed similar trends to TSP mass. According to correlations among major ions, the major compounds in TSP were likely to be (NH4)2SO4, NH4NO3, CaCl2,and KCl in both sampling times, and CaSO4 and Ca(NO3)2 were also present in summer. The NO3 /SO42^- ratios ranged from 0.57 to 1.28 (average 0.85 ± 0.16) in winter and 0.5 to 0.93 (average 0.66 ±0.11) in summer, indicating stationary source ernissi ons (coal bur ning) were more im porta nt sources than the vehicle exhaust. The relationship between SO4^2- and δ^34S indicated the sulfate sources were affected by the low sulfur isotope value of biogenic sulfur release in summer, and the high sulfur isotope value of coal in winter. As a whole, the mixture of coal burning and vehicle exhaust represent the major TSP sources in Chengdu in the study period, and biogenic sulfur also contributes to TSP in summer.展开更多
This paper presents the properties of fluid inclusions found in sphalerite from Latala epithermal base and precious metal deposit(Central Iran),which is hosted in Cenozoic volcanicsedimentary host-rocks.The Latala Dep...This paper presents the properties of fluid inclusions found in sphalerite from Latala epithermal base and precious metal deposit(Central Iran),which is hosted in Cenozoic volcanicsedimentary host-rocks.The Latala Deposit represents an example of vein type,base metal deposits in the Miduk porphyry copper deposits(PCDs)in southern Urumieh-Dokhtar magmatic belt(UDMB).Mineralization in Latala epithermal base and precious metal vein type formed in 3 stages and sphalerite-quartz veins occur in stages 2 and 3.Stage 2 quartz-sphalerite veins are associated with chalcopyrite and zoned sphalerite,along with quartz+hematite,and Stage 3 quartz-sphalerite veins contain galena+sphalerite+chalcopyrite and quartz with overgrowth of calcite.Mineralization in Stage 3 occurs as replacement bodies and contains Fe-poor sphalerite without zoning in the outer parts of the deposit.This paper focuses on fluid inclusions in veins bearing sphalerite and quartz.The fluid inclusion homogenization temperatures and salinity in sphalerite(some with typical zoning)range from 144 to 285℃and from 0.2 wt.%to 7.6 wt.%NaCl eq.Sphalerite and fluid inclusions of the Latala base and precious metal deposit formed from relatively low-T and low-salinity solutions.Raman spectroscopy analyses indicate a high percentage of CO2 in the gas phase of fluid inclusions in Fe-poor sphalerites,as expected with melting temperature for CO2 of-56.6℃,and significant amounts of H2.Lack of reduced carbon species(methane and lighter hydrocarbons)was confirmed in the petrographic study using UV light and Raman spectroscopy.High amounts of H2 in fluid inclusions of Fe-poor sphalerite can be the result of different intensities of alteration and diffusion processes.The common occurrences of CO2 in fluid inclusions have originated from magma degassing and dissolution of carbonates.Theδ^34S values for sulfide minerals in galena of sphalerite bearing veins vary between-9.8‰and-1.0‰,and theδ^34S values calculated for H2 S are between-7.1‰and+0.6‰.These values correspond to magmatic sulfur whit possible interaction with wall rocks.Magmatic fluids were successively diluted during cooling and continuous ascent.Secondary boiling would lead to variable amounts of potassic or prophylactic alteration and the hydrogen diffusion into the inclusions hosted in sphalerite of Latala.展开更多
Pancarli Ni-Cu±(PGE)sulfide deposit occurs in the Neoproterozoic basement complex of the Bitlis massif,which is one of the Andean-type active continental margin fragments with arc-type assemblages represented by ...Pancarli Ni-Cu±(PGE)sulfide deposit occurs in the Neoproterozoic basement complex of the Bitlis massif,which is one of the Andean-type active continental margin fragments with arc-type assemblages represented by the Cadomian orogenic belt.Pancarli sulfides are associated with quartzo-feldspathic gneisses(country rock)and mafic intrusions(host rock).Composed of only semi-massive ore,the Ni-Cu±(PGE)sulfide deposit is a small-scale deposit,and it does not contain net-textured and disseminated ore.The mineral assemblage comprises pyrrhotite,pentlandite,and chalcopyrite.The semi-massive ore samples contain 2.2 wt.%-2.9 wt.%Ni,0.8 wt.%-2.2 wt.%Cu(Cu/(Cu+Ni)=0.2-0.5)and 0.13 wt.%-0.17 wt.%Co.The Cu/Ni ratios(average 0.57)are consistent with the segregation of sulfides from a basaltic magma.Low Pt+Pd100%S values of 0.08 ppm-0.89 ppm,relatively low Pt/Pd ratios of 0.2-1.4,and Pd/Ir ratios of 4.5-39 have also been revealed.These values demonstrate that the magma reached S saturation before its emplacement and the mineralization with high Cu/Pd ratios formed by sulfides segregated from a PGE-depleted magma.δ^34S isotope values(average-3.1‰)of Pancarli sulfides are lower than mantle source.Negativeδ^34S value indicates contamination from surrounding rocks.Concerning the composition,remobilization style and magma type,the Pancarli Ni-Cu±(PGE)sulfide deposit is similar to the deposits associated with Andean-type magmatic arcs located in the convergent plate margin settings.展开更多
基金the National Natural Science Foundation (Grant No. 41773006, 91644104)the West Light Foundation of the Chinese Academy of Sciences, the “Strategic Priority Research Program" of the Chinese Academy of Sciences (Grant No. XDB05030305)and Tongren University PhD Launches Fund (tyxyDH1609).
文摘Daytime and nighttime aerosol samples for total suspended particles (TSP) were collected in Chengdu from 12 to 23 January 2013 (winter) and 10 to 21 August 2014 (summer). The mass concentrations of TSP, major inorganic ions, and stable sulfur isotope ratios were determined. Clear winter-summer variatio n inT SPwas observed;the mass concentrations ofTSPin summerwere below levels defi ned by the Chinese National Ambient Air Quality Standard (GB3095-2012), whereas winter TSP levels exceeded the standard by 2-4 times. Overall, the sum of SO4^2-, NO3^-, and NH4^+ concentmtions represented the highest contribution to water-soluble ionic components, which showed similar trends to TSP mass. According to correlations among major ions, the major compounds in TSP were likely to be (NH4)2SO4, NH4NO3, CaCl2,and KCl in both sampling times, and CaSO4 and Ca(NO3)2 were also present in summer. The NO3 /SO42^- ratios ranged from 0.57 to 1.28 (average 0.85 ± 0.16) in winter and 0.5 to 0.93 (average 0.66 ±0.11) in summer, indicating stationary source ernissi ons (coal bur ning) were more im porta nt sources than the vehicle exhaust. The relationship between SO4^2- and δ^34S indicated the sulfate sources were affected by the low sulfur isotope value of biogenic sulfur release in summer, and the high sulfur isotope value of coal in winter. As a whole, the mixture of coal burning and vehicle exhaust represent the major TSP sources in Chengdu in the study period, and biogenic sulfur also contributes to TSP in summer.
基金supported by the Ministry of Science, Research and Technology of Iran and TRIGGER Program。
文摘This paper presents the properties of fluid inclusions found in sphalerite from Latala epithermal base and precious metal deposit(Central Iran),which is hosted in Cenozoic volcanicsedimentary host-rocks.The Latala Deposit represents an example of vein type,base metal deposits in the Miduk porphyry copper deposits(PCDs)in southern Urumieh-Dokhtar magmatic belt(UDMB).Mineralization in Latala epithermal base and precious metal vein type formed in 3 stages and sphalerite-quartz veins occur in stages 2 and 3.Stage 2 quartz-sphalerite veins are associated with chalcopyrite and zoned sphalerite,along with quartz+hematite,and Stage 3 quartz-sphalerite veins contain galena+sphalerite+chalcopyrite and quartz with overgrowth of calcite.Mineralization in Stage 3 occurs as replacement bodies and contains Fe-poor sphalerite without zoning in the outer parts of the deposit.This paper focuses on fluid inclusions in veins bearing sphalerite and quartz.The fluid inclusion homogenization temperatures and salinity in sphalerite(some with typical zoning)range from 144 to 285℃and from 0.2 wt.%to 7.6 wt.%NaCl eq.Sphalerite and fluid inclusions of the Latala base and precious metal deposit formed from relatively low-T and low-salinity solutions.Raman spectroscopy analyses indicate a high percentage of CO2 in the gas phase of fluid inclusions in Fe-poor sphalerites,as expected with melting temperature for CO2 of-56.6℃,and significant amounts of H2.Lack of reduced carbon species(methane and lighter hydrocarbons)was confirmed in the petrographic study using UV light and Raman spectroscopy.High amounts of H2 in fluid inclusions of Fe-poor sphalerite can be the result of different intensities of alteration and diffusion processes.The common occurrences of CO2 in fluid inclusions have originated from magma degassing and dissolution of carbonates.Theδ^34S values for sulfide minerals in galena of sphalerite bearing veins vary between-9.8‰and-1.0‰,and theδ^34S values calculated for H2 S are between-7.1‰and+0.6‰.These values correspond to magmatic sulfur whit possible interaction with wall rocks.Magmatic fluids were successively diluted during cooling and continuous ascent.Secondary boiling would lead to variable amounts of potassic or prophylactic alteration and the hydrogen diffusion into the inclusions hosted in sphalerite of Latala.
基金supported by the General Directorate of Mineral Research and Exploration。
文摘Pancarli Ni-Cu±(PGE)sulfide deposit occurs in the Neoproterozoic basement complex of the Bitlis massif,which is one of the Andean-type active continental margin fragments with arc-type assemblages represented by the Cadomian orogenic belt.Pancarli sulfides are associated with quartzo-feldspathic gneisses(country rock)and mafic intrusions(host rock).Composed of only semi-massive ore,the Ni-Cu±(PGE)sulfide deposit is a small-scale deposit,and it does not contain net-textured and disseminated ore.The mineral assemblage comprises pyrrhotite,pentlandite,and chalcopyrite.The semi-massive ore samples contain 2.2 wt.%-2.9 wt.%Ni,0.8 wt.%-2.2 wt.%Cu(Cu/(Cu+Ni)=0.2-0.5)and 0.13 wt.%-0.17 wt.%Co.The Cu/Ni ratios(average 0.57)are consistent with the segregation of sulfides from a basaltic magma.Low Pt+Pd100%S values of 0.08 ppm-0.89 ppm,relatively low Pt/Pd ratios of 0.2-1.4,and Pd/Ir ratios of 4.5-39 have also been revealed.These values demonstrate that the magma reached S saturation before its emplacement and the mineralization with high Cu/Pd ratios formed by sulfides segregated from a PGE-depleted magma.δ^34S isotope values(average-3.1‰)of Pancarli sulfides are lower than mantle source.Negativeδ^34S value indicates contamination from surrounding rocks.Concerning the composition,remobilization style and magma type,the Pancarli Ni-Cu±(PGE)sulfide deposit is similar to the deposits associated with Andean-type magmatic arcs located in the convergent plate margin settings.
