Siderophile element systematics of IAB complex iron meteorites: New insights into the formation of an enigmatic group.

ABSTRACT: Siderophile trace element abundances and the ¹⁸⁷Re-¹⁸⁷Os isotopic systematics of the metal phases of 58 IAB complex iron meteorites were determined in order to investigate formation processes and how meteorites within chemical subgroups may be related. Close adherence of ¹⁸⁷Re-¹⁸⁷Os isotopic data of most IAB iron meteorites to a primordial isochron indicates that the siderophile elements of most members of the complex remained closed to elemental disturbance soon after formation. Minor, presumably late-stage open-system behavior, however, is observed in some members of the sLM, sLH, sHL, and sHH subgroups. The new siderophile element abundance data are consistent with the findings of prior studies suggesting that the IAB subgroups cannot be relat

SUBMITTER: Worsham EA 

PROVIDER: S-EPMC6457471 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature