STARDUST INVESTIGATION INTO THE CR CHONDRITE GROVE MOUNTAIN 021710
作者单位：Key Laboratory of the Earth's Deep InteriorInstitute of Geology and GeophysicsChinese Academy of Sciences Laboratory for Space Sciences and Physics DepartmentWashington UniversityOne Brookings DriveSt.LouisMO 63130USA Department of Chemistry and BiochemistryArizona State UniversityP.O.Box 871604TempeAZ 85287USA
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学]
基 金：supported by the Natural Science Foundation of China(40830421) NASA grant(NNX10AH43G)
关 键 词：astrochemistry-circumstellar matter-novae cataclysmic variables-nuclear reactions nucleosynthesis abundances-stars:winds outflows-supernovae:general
摘 要：We report the presolar grain inventory of the CR chondrite Grove Mountain 021710.A total of 35 C-anomalous grains(～236 ppm) and 112 O-anomalous grains(～189 ppm) were identified in situ using NanoSIMS ion imaging. Of 35 C-anomalous grains,28 were determined to be SiC grains by Auger *** of the SiC grains were subsequently measured for N and Si isotopes,allowing classification as one nova grain,one Y grain,one Z grain,and four mainstream ***-nine out of 112 O-anomalous grains belong to Group 1,indicating origins in low-to-intermediate-mass red giant and asymptotic giant branch ***-one are Group 4 grains and have origins in *** spectroscopic elemental measurements of 35 O-anomalous grains show that 33 of them are ferromagnesian *** have higher Mg/(Mg+Fe) ratios than those reported in other meteorites, suggesting a lower degree of alteration in the nebula and/or asteroid parent *** two oxide grains were identified,with stoichiometric compositions of MgAlO and SiO,*** presolar silicate/oxide ratio of GRV 021710 is comparable with those of the CR3 chondrites(QUE 99177 and MET 00426) and primitive interplanetary dust *** order to search for presolar sulfides,the meteorite was also mapped for S isotopes. However,no presolar sulfides were found,suggesting a maximum abundance of 2 *** scarcity of presolar sulfides may be due to their much faster sputtering rate by cosmic rays compared to silicates.