Iodine-Xenon Sysmte in Outer and Inner Portions of Chondrules from the Unnamed Antarctic LL3 Chondrite

摘要

Alteration processes may affect I-Xe system in unequilibrated ordinary chondrites. It was shown that at the edges, where a contribution is made by matrix material around the rim, (sup 129)*Xe/(sup 128)Xe values are generally lower (later apparent ages) than in the main chondrule mass. In this work we attempted to investigate whether thermal metamorphism can affect the I-Xe system in LL3 chondrites which did not experienced aqueous alteration. Six chondrules from the Unnamed Antarctic meteorite L3/LL3 were used in this study. Typically chondrules from this meteorite have varying grain sizes and generally not mineralogically similar to each other.