Excesses of ^(36)S in Sulfide-bearing Ca-Al-rich Inclusions from Allende

Abstract

Introduction: Having four stable isotopes, Sis a potential tracer of processes such as mass independent chemistry, irradiation and/or the presence of nucleosynthetic anomalies [e.g. 1] in the early solar system. To study these processes, S isotope compositions were measured in 6 refractory metal-rich assemblages (Fremdlinge) from 3 Ca-Al-rich inclusions (CAis) and in 5 massive sulfides in chondrules and matrix of the Allende CV3 chondrite, using high precision multiple-collector secondary ion mass spectrometry.