在分析绿色施工内涵、绿色施工推进现状的基础上,剖析了绿色施工推进过程中存在的认知模糊、体制制约、机制不活等困境;基于此,在生态文明建设背影下,为推进绿色施工,说明了将绿色融入工程项目管理四大目标的必要性和重要意义;提出了将...在分析绿色施工内涵、绿色施工推进现状的基础上,剖析了绿色施工推进过程中存在的认知模糊、体制制约、机制不活等困境;基于此,在生态文明建设背影下,为推进绿色施工,说明了将绿色融入工程项目管理四大目标的必要性和重要意义;提出了将工程项目＂健康——安全——环境＂管理体系（Health Safety and Enviromen Management System,简称工程项目HSE MS）改进为工程项目＂健康——安全——绿色＂管理体系（Health Safety and Green Management System,简称工程项目HSG MS）的具体建议;对改进后的工程项目HSG MS的可行性、可接受性作了相关分析。展开更多
It is of great importance to understand the origin of UG2 chromitite reefs and reasons why some chromitite reefs contain relatively high contents of platinum group elements（PGEs： Os, Ir, Ru, Rh,Pt, Pd） or highly si...It is of great importance to understand the origin of UG2 chromitite reefs and reasons why some chromitite reefs contain relatively high contents of platinum group elements（PGEs： Os, Ir, Ru, Rh,Pt, Pd） or highly siderophile elements（HSEs： Au, Re, PGE）. This paper documents sulphide-silicate assemblages enclosed in chromite grains from the UG2 chromitite. These are formed as a result of crystallisation of sulphide and silicate melts that are trapped during chromite crystallisation. The inclusions display negative crystal shapes ranging from several micrometres to 100 μm in size.Interstitial sulphide assemblages lack pyrrhotite and consist of chalcopyrite, pentlandite and some pyrite. The electron microprobe data of these sulphides show that the pentlandite grains present in some of the sulphide inclusions have a significantly higher iron（Fe） and lower nickel（Ni） content than the pentlandite in the rock matrix. Pyrite and chalcopyrite show no difference. The contrast in composition between inter-cumulus plagioclase（An_（68）） and plagioclase enclosed in chromite（An_（13））, as well as the presence of quartz, is consistent with the existence of a felsic melt at the time of chromite saturation.Detailed studies of HSE distribution in the sulphides and chromite were conducted by LA-ICP-MS（laser ablation-inductively coupled plasma-mass spectrometry）, which showed the following.（Ⅰ） Chromite contained no detectable HSE in solid solution.（Ⅱ） HSE distribution in sulphide assemblages interstitial to chromite was variable. In general, Pd, Rh, Ru and Ir occurred dominantly in pentlandite, whereas Os,Pt and Au were detected only in matrix sulphide grains and were clearly associated with Bi and Te.（Ⅲ）In the sulphide inclusions,（a） pyrrhotite did not contain any significant amount of HSE,（b） chalcopyrite contained only some Rh compared to the other sulphides,（c） pentlandite was the main host for Pd,（d）pyrite contained most of the Ru, Os, Ir and Re,（e） Pt and Rh were closely associated with Bi forming a continuous rim between pyrite and pentlandite and（f） no Au was detected. These results show that the use of ArF excimer laser to produce high-resolution trace element maps provides information that cannot be obtained by conventional（spot） LA-ICP-MS analysis or trace element maps that use relatively large beam diameters.展开更多
文摘在分析绿色施工内涵、绿色施工推进现状的基础上,剖析了绿色施工推进过程中存在的认知模糊、体制制约、机制不活等困境;基于此,在生态文明建设背影下,为推进绿色施工,说明了将绿色融入工程项目管理四大目标的必要性和重要意义;提出了将工程项目＂健康——安全——环境＂管理体系（Health Safety and Enviromen Management System,简称工程项目HSE MS）改进为工程项目＂健康——安全——绿色＂管理体系（Health Safety and Green Management System,简称工程项目HSG MS）的具体建议;对改进后的工程项目HSG MS的可行性、可接受性作了相关分析。
基金granted by Laurentian UniversityNational Key R&D Program of China(Grant No.2016YFC0600207)
文摘It is of great importance to understand the origin of UG2 chromitite reefs and reasons why some chromitite reefs contain relatively high contents of platinum group elements（PGEs： Os, Ir, Ru, Rh,Pt, Pd） or highly siderophile elements（HSEs： Au, Re, PGE）. This paper documents sulphide-silicate assemblages enclosed in chromite grains from the UG2 chromitite. These are formed as a result of crystallisation of sulphide and silicate melts that are trapped during chromite crystallisation. The inclusions display negative crystal shapes ranging from several micrometres to 100 μm in size.Interstitial sulphide assemblages lack pyrrhotite and consist of chalcopyrite, pentlandite and some pyrite. The electron microprobe data of these sulphides show that the pentlandite grains present in some of the sulphide inclusions have a significantly higher iron（Fe） and lower nickel（Ni） content than the pentlandite in the rock matrix. Pyrite and chalcopyrite show no difference. The contrast in composition between inter-cumulus plagioclase（An_（68）） and plagioclase enclosed in chromite（An_（13））, as well as the presence of quartz, is consistent with the existence of a felsic melt at the time of chromite saturation.Detailed studies of HSE distribution in the sulphides and chromite were conducted by LA-ICP-MS（laser ablation-inductively coupled plasma-mass spectrometry）, which showed the following.（Ⅰ） Chromite contained no detectable HSE in solid solution.（Ⅱ） HSE distribution in sulphide assemblages interstitial to chromite was variable. In general, Pd, Rh, Ru and Ir occurred dominantly in pentlandite, whereas Os,Pt and Au were detected only in matrix sulphide grains and were clearly associated with Bi and Te.（Ⅲ）In the sulphide inclusions,（a） pyrrhotite did not contain any significant amount of HSE,（b） chalcopyrite contained only some Rh compared to the other sulphides,（c） pentlandite was the main host for Pd,（d）pyrite contained most of the Ru, Os, Ir and Re,（e） Pt and Rh were closely associated with Bi forming a continuous rim between pyrite and pentlandite and（f） no Au was detected. These results show that the use of ArF excimer laser to produce high-resolution trace element maps provides information that cannot be obtained by conventional（spot） LA-ICP-MS analysis or trace element maps that use relatively large beam diameters.
