Ion Probe Study of Silicate Inclusions from Colomera (ⅡE) Iron Meteorite: the Rare Earth Element Perspective

作     者：HSU Weibiao 

作者机构：CA 91125 California Institute of Technology China Division of Geological & Planetary Sciences Chinese Academy of Sciences Laboratory for Astrochemistry and Planetary Sciences Purple Mountain Observatory Nanjing 210008 Pasadena USA 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报(英文版))

年 卷 期：2004年第78卷第5期

页      面：1060-1074页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 

主　　题：ion probe rare earth elements Colomera silicate inclusions ⅡE iron meteorites 

摘      要：Coupled with a petrographical study, I carried out an ion probe study of rare earth element microdistributions in mineral phases of silicate inclusions from the Colomera ⅡE iron meteorite. Most mineral grains have homogeneous REEs, but show considerable inter-grain variations by a factor of 2 to 100. The whole rock REE abundances for Colomera, estimated by combining REE data with modal abundances, are relatively LREE-enriched with REEs of -10’CI, which suggest that Colomera silicates were highly differentiated and might represent a low degree partial melt (-10%) of a chondritic source. REE geochemistry of Colomera silicate inclusions points to an origin that involves differentiation, dynamic mixing, remelting, reduction, recrystallization, and subsequent rapid cooling near the surface of a planetary body.