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Disk Evolution, Chronology, and Isotope Anomalies 1
Monday, July 29, 2024, 3:15 PM
Throne Room
Chairs:
Rachel Smith
Christoph Burkhardt
Christoph Burkhardt
3:15 PM
Fukuda K.*
Zhang M.
Hertwig A. T.
Chaumard N.
Tenner T. J.
et al.
Timing of Chondrule Formation in Different Redox Conditions
[#6338]
We examined the relationship in Al-Mg ages between type I and type II chondrules from pristine CM and CO chondrites. The durations for each type differ slightly, suggesting reducing environments persisted longer than oxidizing environments.
We examined the relationship in Al-Mg ages between type I and type II chondrules from pristine CM and CO chondrites. The durations for each type differ slightly, suggesting reducing environments persisted longer than oxidizing environments.
3:30 PM
Burkhardt C.*
Jansen C.
Marrocchi Y.
Villeneuve J.
Wölfer E.
et al.
Isotope Genealogy and Al-Mg Chronology of Individual OC Chondrules
[#6267]
We present the first combined petrographic, O, Ti, and Cr isotopic, and Al-Mg chronometric investigation of a comprehensive set of NC chondrules.
We present the first combined petrographic, O, Ti, and Cr isotopic, and Al-Mg chronometric investigation of a comprehensive set of NC chondrules.
3:45 PM
Yang X.*
Zhang M.
Korsmeyer J. M.
Greer J.
Davis A. M.
et al.
F/FUN Hibonite and Corundum Separated from Aguas Zarcas and Murchison: Insights into the 26Al Heterogeneity in the Solar Nebula
[#6357]
A new subgroup of hibonite characterized by low TiO2 and MgO (<0.1 wt%) and corundum grains separated from CM2 chondrites show a well-defined isochron with 26Al/27Al of ~3.4*10^–6.
A new subgroup of hibonite characterized by low TiO2 and MgO (<0.1 wt%) and corundum grains separated from CM2 chondrites show a well-defined isochron with 26Al/27Al of ~3.4*10^–6.
4:00 PM
Aberham V.*
Desch S. J.
How CAI-Rich Can Asteroids Be?
[#6222]
We show that if Jupiter formed at 0.2 m.y., a small fraction of asteroids would form with up to 20 wt% CAIs, explaining recent analyses of iron meteorites while retaining the successful match of the Desch et al. (2018) model to chondrites.
We show that if Jupiter formed at 0.2 m.y., a small fraction of asteroids would form with up to 20 wt% CAIs, explaining recent analyses of iron meteorites while retaining the successful match of the Desch et al. (2018) model to chondrites.
4:15 PM
Kita N. T.*
Zhang M.
Zolensky M. E.
Fukuda K.
Nakashima D.
et al.
Low Initial 26Al/27Al in Plagioclase from Comet Wild 2
[#6190]
Plagioclase in Comet Wild 2 “Pyxie” was reanalyzed for Al-Mg chronology with improved SIMS methods, though no excess 26Mg was resolved. Minimum formation age is 3.6 m.y. after CAIs, systematically younger than meteoritic chondrules except for CR.
Plagioclase in Comet Wild 2 “Pyxie” was reanalyzed for Al-Mg chronology with improved SIMS methods, though no excess 26Mg was resolved. Minimum formation age is 3.6 m.y. after CAIs, systematically younger than meteoritic chondrules except for CR.
4:30 PM
Desch S. J.*
Extending Statistical Chronometry to Tafassasset, Erg Chech 002, and Other Achondrites
[#6402]
Al-Mg, Mn-Cr, Hf-W, and Pb-Pb systems are concordant for 14 achondrites. We show Tafassasset is, too. The data for Erg Chech 002 are as yet too conflicting to test concordance. There remains no strong evidence against homogeneity of radionuclides.
Al-Mg, Mn-Cr, Hf-W, and Pb-Pb systems are concordant for 14 achondrites. We show Tafassasset is, too. The data for Erg Chech 002 are as yet too conflicting to test concordance. There remains no strong evidence against homogeneity of radionuclides.
4:45 PM
Fang L.*
Moynier F.
Chaussidon M.
Makhatadze G. V.
Villeneuve J.
The Initial Solar System Abundance of 60Fe and the Early Core Formation of the First Asteroids
[#6410]
We used Erg Chech 002, the oldest known crustal fragment from a differentiated planetesimal, to better constrain the initial abundance of 60Fe in the early solar system and thus to decipher the accretion and differentiation history of planetesimals.
We used Erg Chech 002, the oldest known crustal fragment from a differentiated planetesimal, to better constrain the initial abundance of 60Fe in the early solar system and thus to decipher the accretion and differentiation history of planetesimals.
*presenter
