The development of laser sampling for optical emission spectrometry is reviewed . Advantages and limitations of pulsed laser sampling are compared with those of continuous laser sampling . A novel method of laser samp...The development of laser sampling for optical emission spectrometry is reviewed . Advantages and limitations of pulsed laser sampling are compared with those of continuous laser sampling . A novel method of laser sampling of liquid samples for inductively coupled plasma -atomic emission spectrometry has been proposed , and its analytical performance investigated.Experimental results showed that,as a method of sample introduction , laser vaporization of liquid samples enjoyed certain advantages , e.g.,much higher sensitivity, much lower detection limit and reduced sample volume , over solution nebulization . A perspective of the application of laser sampling-inductively coupled plasma - actomic emission spectrometry for rock and mineral analysis is estimated as well.展开更多
This paper studies magnetic properties and composition of granulite-facies rocks of both the Neogene and Archean continental lower crust in the Neogene xenolith-bearing Hannuoba （汉诺坝） alkaline basalt and the expo...This paper studies magnetic properties and composition of granulite-facies rocks of both the Neogene and Archean continental lower crust in the Neogene xenolith-bearing Hannuoba （汉诺坝） alkaline basalt and the exposed lower crustal section in the Archean Huai＇an （淮安） terrain （Wayaokou （瓦窑口）-Manjinggou （蔓菁沟） profile）, the northern North China Craton. It provides a unique oppor-tunity for a comparative study of magnetic properties and composition of both the Archean and Neogene continental lower crust. We measure magnetic parameters （susceptibility x and magnetic hysteresis parameters, such as saturation magnetization Js, saturation isothermal remanent magnetization Jrs, and intrinsic coercivity He） of eleven Hannuoba lower crustal xenoliths and nine terrain granulites from the Archean Huai＇an terrain. Results indicate that the average values of K,Js and Jrs of Archean granu- lites are 4 122×10^-6 SI, 523.1 A/m and 74.9 A/m, respectively, which are generally higher than those of granulite-facies xenoliths （1 657×10^-6 SI, 163.9 A/m and 41.9 A/m, respectively）. These two types of granulites contain ilmenite, （titano） magnetite, minor hematite and some ＂magnetic silicates＂ （clinopyroxene, plagioclase and biotite）. The Mg-rich ilmenite in granulite-facies xenolith is relatively higher than that in terrain granulites. We observe a more evolved character as higher magnetic as well as lower Sr/Nd, Cr/Nd, Ni/Nd, Co/Nd and V/Nd ratios in terrain granulites. These differences in magnetic characteristics reflect their different origins and evolutions. The high magnetization of granulites in the Huai＇an terrain represents magnetic properties of the Archean continental lower crust, and low magnetization of granufite-facies xenoliths represents mag- netic properties of the Cenozoic lower crusts in the northern North China Craton.展开更多
文摘The development of laser sampling for optical emission spectrometry is reviewed . Advantages and limitations of pulsed laser sampling are compared with those of continuous laser sampling . A novel method of laser sampling of liquid samples for inductively coupled plasma -atomic emission spectrometry has been proposed , and its analytical performance investigated.Experimental results showed that,as a method of sample introduction , laser vaporization of liquid samples enjoyed certain advantages , e.g.,much higher sensitivity, much lower detection limit and reduced sample volume , over solution nebulization . A perspective of the application of laser sampling-inductively coupled plasma - actomic emission spectrometry for rock and mineral analysis is estimated as well.
基金supported by the National Natural Science Foundation of China(Nos.41130315,91214204)the Special Project of Deep Probe Technology and Experimental Research of the Ministry of Land and Resources of China(Sinoprobe-07-03)
文摘This paper studies magnetic properties and composition of granulite-facies rocks of both the Neogene and Archean continental lower crust in the Neogene xenolith-bearing Hannuoba （汉诺坝） alkaline basalt and the exposed lower crustal section in the Archean Huai＇an （淮安） terrain （Wayaokou （瓦窑口）-Manjinggou （蔓菁沟） profile）, the northern North China Craton. It provides a unique oppor-tunity for a comparative study of magnetic properties and composition of both the Archean and Neogene continental lower crust. We measure magnetic parameters （susceptibility x and magnetic hysteresis parameters, such as saturation magnetization Js, saturation isothermal remanent magnetization Jrs, and intrinsic coercivity He） of eleven Hannuoba lower crustal xenoliths and nine terrain granulites from the Archean Huai＇an terrain. Results indicate that the average values of K,Js and Jrs of Archean granu- lites are 4 122×10^-6 SI, 523.1 A/m and 74.9 A/m, respectively, which are generally higher than those of granulite-facies xenoliths （1 657×10^-6 SI, 163.9 A/m and 41.9 A/m, respectively）. These two types of granulites contain ilmenite, （titano） magnetite, minor hematite and some ＂magnetic silicates＂ （clinopyroxene, plagioclase and biotite）. The Mg-rich ilmenite in granulite-facies xenolith is relatively higher than that in terrain granulites. We observe a more evolved character as higher magnetic as well as lower Sr/Nd, Cr/Nd, Ni/Nd, Co/Nd and V/Nd ratios in terrain granulites. These differences in magnetic characteristics reflect their different origins and evolutions. The high magnetization of granulites in the Huai＇an terrain represents magnetic properties of the Archean continental lower crust, and low magnetization of granufite-facies xenoliths represents mag- netic properties of the Cenozoic lower crusts in the northern North China Craton.
