Existence of an 16O-Rich Gaseous Reservoir in the Solar Nebula

Carbonaceous chondrite condensate olivine grains from two distinct petrographic settings, calcium-aluminum–rich inclusion (CAI) accretionary rims and amoeboid olivine aggregates (AOAs), are oxygen-16 (16O) enriched at the level previously observed inside CAIs. This requires that the gas in the nebular region where these grains condensed was 16O-rich. This contrasts with an16O-poor gas present during the formation of chondrules, suggesting that CAIs and AOAs formed in a spatially restricted region of the solar nebula containing 16O-rich gas. The16O-rich gas composition may have resulted either from mass-independent isotopic chemistry or from evaporation of regions with enhanced dust/gas ratios, possibly in an X-wind environment near the young Sun.

[1]  R. Clayton.  Oxygen Isotopes in Meteorites , 2003 .

[2]  E. Scott,et al.  Oxygen isotopic compositions and origins of calcium‐aluminum‐rich inclusions and chondrules , 2001 .

[3]  P. Cassen.  Nebular thermal evolution and the properties of primitive planetary materials , 2001 .

[4]  K. Keil,et al.  Mineralogy and petrography of amoeboid olivine aggregates from the reduced CV3 chondrites Efremovka, Leoville and Vigarano: Products of nebular condensation, accretion and annealing , 2001 .

[5]  K. Keil,et al.  Forsterite‐rich accretionary rims around calcium‐aluminum‐rich inclusions from the reduced CV3 chondrite Efremovka , 2001 .

[6]  K. Keil,et al.  Calcium‐aluminum‐rich inclusions in enstatite chondrites (II): Oxygen isotopes , 2001 .

[7]  N. Kita,et al.  A short duration of chondrule formation in the solar nebula: evidence from 26Al in Semarkona ferromagnesian chondrules , 2000 .

[8]  Y. Guan,et al.  Oxygen isotopes in calcium-aluminum-rich inclusions from enstatite chondrites: new evidence for a single CAI source in the solar nebula , 2000 .

[9]  K. Keil,et al.  Calcium‐aluminum‐rich inclusions in enstatite chondrites (I): Mineralogy and textures , 2000 .

[10]  D. Ebel,et al.  Condensation in dust-enriched systems , 2023, 2307.00641.

[11]  H. Hiyagon,et al.  16O excesses in olivine inclusions in Yamato-86009 and Murchison chondrites and their relation to CAIs. , 1999, Science.

[12]  M. Thiemens,et al.  Mass-independent isotope effects in planetary atmospheres and the early solar system. , 1999, Science.

[13]  H. Yurimoto,et al.  Oxygen isotope exchange between refractory inclusion in Allende and solar nebula gas. , 1998, Science.

[14]  J. Wood,et al.  The condensation with partial isolation (CWPI) model of condensation in the solar nebula , 1998 .

[15]  J. Wood.  Meteoritic Evidence for the Infall of Large Interstellar Dust Aggregates during the Formation of the Solar System , 1998 .

[16]  L. Leshin,et al.  Oxygen isotopic abundances in calcium- aluminum-rich inclusions from ordinary chondrites: implications for nebular heterogeneity. , 1998, Science.

[17]  G. Wasserburg,et al.  Evidence for Widespread 26Al in the Solar Nebula and Constraints for Nebula Time Scales , 1996, Science.

[18]  F. Shu,et al.  Toward an Astrophysical Theory of Chondrites , 1996, Science.

[19]  A. Davis,et al.  The distribution of aluminum-26 in the early Solar System—A reappraisal , 1995 .

[20]  A. Davis,et al.  A petrologic and ion microprobe study of a Vigarano Type B refractory inclusion: Evolution by multiple stages of alteration and melting , 1993 .

[21]  R. Clayton,et al.  Chemical, isotopic and mineralogical evidence for the origin of matrix in ordinary chondrites , 1989 .

[22]  L. Grossman,et al.  Accretionary rims on inclusions in the Allende meteorite , 1985 .

[23]  J. Wood.  The interstellar dust as a precursor of Ca, Al-rich inclusions in carbonaceous chondrites , 1981 .

[24]  R. Clayton,et al.  A Component of Primitive Nuclear Composition in Carbonaceous Meteorites , 1973, Science.

[25]  E. Anders,et al.  Meteorites and the Early Solar System , 1971 .