Petrographic and oxygen-isotopic study of refractory forsterites from R-chondrite Dar al Gani 013 (R3.5–6), unequilibrated ordinary and carbonaceous chondrites

2004 ◽  
Vol 68 (5) ◽  
pp. 1135-1157 ◽  
Author(s):  
Andreas Pack ◽  
Hisayoshi Yurimoto ◽  
Herbert Palme
Keyword(s):  
Carbonaceous Chondrites ◽  
Isotopic Study ◽  
Oxygen Isotopic

scholarly journals Oxygen isotopic heterogeneity in the early Solar System inherited from the protosolar molecular cloud

2020 ◽  
Vol 6 (42) ◽  
pp. eaay2724
Author(s):  
Alexander N. Krot ◽  
Kazuhide Nagashima ◽  
James R. Lyons ◽  
Jeong-Eun Lee ◽  
Martin Bizzarro
Keyword(s):  
Solar System ◽  
Molecular Cloud ◽  
Limited Range ◽  
Terrestrial Planets ◽  
Carbonaceous Chondrites ◽  
The Sun ◽  
Early Solar System ◽  
Isotopic Heterogeneity ◽  
Oxygen Isotopic ◽  
O 24

The Sun is 16O-enriched (Δ17O = −28.4 ± 3.6‰) relative to the terrestrial planets, asteroids, and chondrules (−7‰ < Δ17O < 3‰). Ca,Al-rich inclusions (CAIs), the oldest Solar System solids, approach the Sun’s Δ17O. Ultraviolet CO self-shielding resulting in formation of 16O-rich CO and 17,18O-enriched water is the currently favored mechanism invoked to explain the observed range of Δ17O. However, the location of CO self-shielding (molecular cloud or protoplanetary disk) remains unknown. Here we show that CAIs with predominantly low (26Al/27Al)0, <5 × 10−6, exhibit a large inter-CAI range of Δ17O, from −40‰ to −5‰. In contrast, CAIs with the canonical (26Al/27Al)0 of ~5 × 10−5 from unmetamorphosed carbonaceous chondrites have a limited range of Δ17O, −24 ± 2‰. Because CAIs with low (26Al/27Al)0 are thought to have predated the canonical CAIs and formed within first 10,000–20,000 years of the Solar System evolution, these observations suggest oxygen isotopic heterogeneity in the early solar system was inherited from the protosolar molecular cloud.

The formation and alteration of the Renazzo-like carbonaceous chondrites I: Implications of bulk-oxygen isotopic composition

2011 ◽  
Vol 75 (1) ◽  
pp. 308-325 ◽  
Author(s):  
Devin L. Schrader ◽  
Ian A. Franchi ◽  
Harold C. Connolly ◽  
Richard C. Greenwood ◽  
Dante S. Lauretta ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Oxygen Isotopic Composition ◽  
Carbonaceous Chondrites ◽  
Bulk Oxygen ◽  
Oxygen Isotopic

scholarly journals Mineralogical and oxygen isotopic study of a new ultrarefractory inclusion in the Northwest Africa 3118 CV3 chondrite

2020 ◽  
Vol 55 (10) ◽  
pp. 2184-2205
Author(s):  
Yong Xiong ◽  
Ai‐Cheng Zhang ◽  
Noriyuki Kawasaki ◽  
Chi Ma ◽  
Naoya Sakamoto ◽  
...  
Keyword(s):  
Isotopic Study ◽  
Northwest Africa ◽  
Oxygen Isotopic
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