Presolar grains in micro-inclusions of iron meteorites

作     者：Goel, P.S. Murty, S.V.S. 

作者机构：Department of Chemistry Indian Institute of Technology Kanpur India 

出 版 物：《Advances in Space Research》 (Adv. Space Res.)

年 卷 期：1982年第2卷第12期

页      面：13-18页

学科分类：0709[理学-地质学] 0707[理学-海洋科学] 08[工学] 0708[理学-地球物理学] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0802[工学-机械工程] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 

基　　金：Indian Space Research Organisation  ISRO 

摘      要：In residues of several iron meteorites, obtained by dissolution of the metal in dilute H2SO4, the isotopic ratio of 190Os/184Os has been measured by radiochemical neutron activation analysis and is found to be anomalous in several cases. The largest deviation so far seen is a 40% enrichment of 184Os in a mineral of Sikhote Alin. A lack of homogenization of the two isotopes that are produced in different nucleosynthetic processes suggests that iron meteorites are more primitive than any other matter available to us so far. Isotopic composition of Xe is found to be planetary in general. However the two light isotopes 124Xe and 126Xe are strongly depleted in some non-magnetic residues. Correlation diagrams of isotopic ratio pairs indicate that a two component mixture model is not adequate. EPR studies of the non-magnetic fractions of the residues show a large concentration of stabilized free radicals which could be ascribed to an irradiation of micro-inclusions prior to compaction into the metal matrix. © 1983.