Oxygen and magnesium isotopic compositions of amoeboid olivine aggregates from the Semarkona LL3.0 chondrite
作者： Shoichi Itoh , Sara S. Russell , Hisayoshi Yurimoto
DOI: 10.1111/J.1945-5100.2007.TB00571.X
关键词: Isotopes of oxygen 、 Formation and evolution of the Solar System 、 Ordinary chondrite 、 Geology 、 Anorthite 、 Mineralogy 、 Diopside 、 Chondrite 、 Parent body 、 Olivine
摘要: Amoeboid olivine aggregates (AOAs) in the LL3.0 Semarkona chondrite have been studied by secondary ion mass spectrometry. The AOAs mainly consist of grains with interstitial Al-Ti-rich diopside and anorthite. Oxygen-isotopic compositions all phases are consistently enriched 16O, δ17,18O = ~-50‰. initial 26Al/27Al ratios calculated to be 5.6 ± 0.9 (2σ) 10^(-5). These values equivalent those fine-grained calciumaluminum- rich inclusions (FGIs) from pristine carbonaceous chondrites. This suggests that ordinary chondrites formed same 16O-rich calcium-aluminum-rich inclusion (CAI)-forming region solar nebula as FGIs chondrites, subsequently moved accretion parent body nebula.
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