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Disk Evolution, Chronology, and Isotope Anomalies 2
Tuesday, July 30, 2024, 2:15 PM
King Baudouin Room
Chairs:
Rayssa Martins
Paul Frossard
Paul Frossard
2:15 PM
Piralla M.*
Hopp T.
Burkhardt C.
Kleine T.
Iron Isotopic Composition of AOAs in CV Chondrites
[#6462]
Iron isotopic composition of AOAs in Allende is partially overprinted by parent body alteration but points toward negative µ54Fe anomalies. This is consistent in direction with CAIs, suggesting they originated from a common nebular reservoir.
Iron isotopic composition of AOAs in Allende is partially overprinted by parent body alteration but points toward negative µ54Fe anomalies. This is consistent in direction with CAIs, suggesting they originated from a common nebular reservoir.
2:30 PM
Lindner A.*
Braukmüller N.
Becker H.
Chromium Isotope Variations in Separated Fractions of Sahara 97072 (EH3) Revisited
[#6320]
A refined separation of components of the SAHARA 97072 EH3 chondrite shows decoupled ε54Cr-ε53Cr variations in metal-rich and metal-poor fractions and a correlation of ε54Cr anomalies, which are typically found in bulk CC meteorites, with Fe/Cr.
A refined separation of components of the SAHARA 97072 EH3 chondrite shows decoupled ε54Cr-ε53Cr variations in metal-rich and metal-poor fractions and a correlation of ε54Cr anomalies, which are typically found in bulk CC meteorites, with Fe/Cr.
2:45 PM
Hellmann J. L.*
Van Orman J. A.
Kleine T.
Hf-W Fractionation Among Chondrites and the Chronology of Core Formation in Iron Meteorites
[#6395]
Enstatite chondrites and their precursors are characterized by a uniform Hf/W ratio, providing the most appropriate proxy for the average Hf/W ratio of undifferentiated planetesimals from the inner solar system.
Enstatite chondrites and their precursors are characterized by a uniform Hf/W ratio, providing the most appropriate proxy for the average Hf/W ratio of undifferentiated planetesimals from the inner solar system.
3:00 PM
Frossard P.*
Ball J. M. J.
Schönbächler M.
On the Distribution of P-Process Nuclides 144Sm and 142Nd in the Protoplanetary Disc
[#6060]
We measured high-precision mass-independent Nd and Sm isotope compositions of carbonaceous chondrites and couple them to determine the distribution of p-process nuclides 144Sm and 142Nd in the protoplanetary disc.
We measured high-precision mass-independent Nd and Sm isotope compositions of carbonaceous chondrites and couple them to determine the distribution of p-process nuclides 144Sm and 142Nd in the protoplanetary disc.
3:15 PM
Ball J. M. J.*
Frossard P.
Ek M.
Schönbächler M.
Probing the Metallicities of Stardust Producing Stellar Progenitors with S-Process Isotope Variations in Carbonaceous Chondrites
[#6064]
This work utilises s-process isotope variations to investigate the influence of presolar SiC on the isotopic composition of chondrites. The data may provide insight into the metallicities of AGB stars which produced presolar SiC.
This work utilises s-process isotope variations to investigate the influence of presolar SiC on the isotopic composition of chondrites. The data may provide insight into the metallicities of AGB stars which produced presolar SiC.
3:30 PM
Fischer-Gödde M.*
Tusch J.
Bragagni A.
Mohr-Westheide T.
Messling N.
et al.
Ruthenium Isotope Signatures of Terrestrial and Lunar Impact Structures
[#6265]
Nucleosynthetic Ru isotope anomalies in terrestrial and lunar impact rocks provide a genetic fingerprint for identification of impactors deriving from inner and outer solar system reservoirs.
Nucleosynthetic Ru isotope anomalies in terrestrial and lunar impact rocks provide a genetic fingerprint for identification of impactors deriving from inner and outer solar system reservoirs.
3:45 PM
McCain K. A.*
Liu M. -C.
Diverse Nucleosynthetic Heritage of Li-Rich Material in the CO3.05 Chondrite Northwest Africa 7892
[#6426]
We performed isotopic mapping of Li and B in the matrix of the CO3.05 chondrite NWA 7892. Li-rich grains with anomalous Li isotopic compositions record both production of 6Li-rich material by GCR spallation and 7Li-rich material by other processes.
We performed isotopic mapping of Li and B in the matrix of the CO3.05 chondrite NWA 7892. Li-rich grains with anomalous Li isotopic compositions record both production of 6Li-rich material by GCR spallation and 7Li-rich material by other processes.
4:00 PM
Smith R. L.*
Pontoppidan K. M.
Boogert A. C. A.
Oxygen Isotopes as Probes of Protoplanetary Chemistry and Inheritance in Young Stellar Objects
[#6445]
Using ground-based high-resolution IR spectroscopy toward a suite of young stellar objects, we find signatures of CO self-shielding in a range of evolving systems. Our results suggest that CO self-shielding is inherited from parent cloud to disk.
Using ground-based high-resolution IR spectroscopy toward a suite of young stellar objects, we find signatures of CO self-shielding in a range of evolving systems. Our results suggest that CO self-shielding is inherited from parent cloud to disk.
4:15 PM
Thiemens M. H.*
Gelfand N. A.
Komorova K. V.
Remacle F.
Levine R. D.
State of the Art Measurements and Models of Isotopic Fractionation in Photodissociation
[#6108]
New experimental and theoretical modeling of photodissociation is presented, the first model and includes all quantum mechanical parameters at the isotopic level and measurements. The results show that models of self shielding are incomplete.
New experimental and theoretical modeling of photodissociation is presented, the first model and includes all quantum mechanical parameters at the isotopic level and measurements. The results show that models of self shielding are incomplete.
4:30 PM
Stephant A.*
Cuppone T.
Rider-Stokes B.
Carli C.
Zhao X.
et al.
Northwest Africa 8409: Hydrogen Abundance and Isotope Composition in the Mercury-Like Meteorite
[#6052]
We report H2O contents and D/H ratios of pyroxene and olivine from NWA 8409 to assess the origin of water in inner solar system planetesimals. The low D/H ratio recorded in NWA 8409 tends to favor an important contribution of gaseous H from the nebula.
We report H2O contents and D/H ratios of pyroxene and olivine from NWA 8409 to assess the origin of water in inner solar system planetesimals. The low D/H ratio recorded in NWA 8409 tends to favor an important contribution of gaseous H from the nebula.
4:45 PM
Martins R.*
Morton E. M.
Kuthning S.
Goes S.
Williams H. M.
et al.
Primitive Asteroids as a Major Source of Volatiles
[#6051]
Combined with other evidence, nucleosynthetic Zn isotope anomalies suggest that, in spite of proving most of Earth's mass, differentiated material contributed only ~10% of Earth’s Zn. The remaining fraction (~90%) was supplied by primitive materials.
Combined with other evidence, nucleosynthetic Zn isotope anomalies suggest that, in spite of proving most of Earth's mass, differentiated material contributed only ~10% of Earth’s Zn. The remaining fraction (~90%) was supplied by primitive materials.
*presenter
