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Chondrites: Components and Implications

Tuesday, August 15, 2023, 8:30 AM
Luskin Center Centennial Ballroom A–B

Chairs:
Michael Weisberg
Sarah Crowther

Components of chondrites and implications for their formation

8:30 AM
Mikouchi T.* Yoshida H. Masuda M. Zolensky M. E.
Olivine Compositional Systematics of CI Chondrites and Asteroid Ryugu [#6178]
We repot major/minor element compositional systematics of olivine in CI chondrites (Ivuna, Orgueil and Alais) and Ryugu samples. There are two populations suggesting distinct origins either AOA-like or chondrule-like, where AOA-like dominates.
8:45 AM
Gemma M. E.* Ebel D. S. Friedrich J. M. Gonzales J. C. Jaret S. J.
Trace Element Distribution Among Components and Phases in CV Chondrites [#6325]
We present trace element analyses of CV chondrite components and the individual minerals within them. This large dataset complements existing major element and isotopic datasets and addresses formation theories of chondrites and their constituents.
9:00 AM
Harrison C. S.* King A. J. Jones R. H.
Fe-Sulfides in Experimentally and Naturally Heated CM Chondrites [#6236]
We characterize the Fe-sulfide grains within experimentally heated Murchison (CM2) chips and compare to the Fe-sulfide grains in the naturally heated CM chondrites to better constrain their thermal history.
9:15 AM
Crowther S. A.* Cowpe J. S. King A. J. Clay P. L. Gilmour J. D.
Xenon and I-Xe Analysis of the Winchcombe (CM2) Meteorite [#6235]
Winchcombe provides a comparison for the pristine material due to be returned by OSIRIS-REx. A correlation of 128Xe with excess 129Xe in neutron irradiated samples suggests closure to xenon loss ~30 Myr after solar system formation.
9:30 AM
Eckart L. M.* Mertens C. A. K. Busemann H. Maden C. Righter K. Alexander C. M. O'D.
Noble Gases in CO Chondrites: Primordial Components, Effects of Parent Body Thermal Alteration, and Cosmic Ray Exposure Ages [#6208]
We analyzed the noble gases in a large set of CO chondrites, some of which experienced mild thermal alteration. We found correlations between trapped gas concentrations and metamorphic grade, determined cosmic ray exposure ages and potential pairings.
9:45 AM
Alosius R. M. L.* Busemann H. Krietsch D. Davidson J. Maden C.
Noble Gases in Loongana-type (CL) and Ungrouped Carbonaceous Chondrites [#6247]
We studied noble gases in ungrouped carbonaceous chondrites to analyze the effects of secondary alteration on their compositions, and their genetic links. We also studied noble gases in CLs and CKs as a comparison due to their isotopic similarities.
10:00 AM
Break
10:15 AM
Ebel D. S.* Gemma M. E. Weisberg M. K.
Abundances of Complementary Clasts and Matrix Across Chondrite Groups [#6027]
Component abundance in CI, CM2, CO3, CV3, CR2, K, and LL3 chondrites measured consistently from manually segmented x-ray map stacks, combined with major element ratios, support single reservoirs of formation and accretion.
10:30 AM
Chaussidon M.* Tharaud M. Moreira E. Mercadier J. Deloule E. Benedetti M. F.
Development of the Study of the Matrix of Primitive Chondrites by ICP-TOF-MS Single Particle Analysis [#6188]
Analyses by ICP-TOF-MS give a statistical view of the composition of 50–500-nm-sized grains forming the matrix of chondrites.
10:45 AM
Tauseef M.* Leya I. Braucher R. Lechleitner F. Gattacceca J. Szidat S. ASTER Team 
Studying the Shielding Dependence of 14C and 14C/10Be for Terrestrial Age Dating [#6065]
We aim to study the shielding dependence of the 14C production rate and 14C/10Be ratio by combining experimental data from fresh falls with model calculation. This will help significantly increase the precision and accuracy of terrestrial age dating.
11:00 AM
Dobrică E.* Megevand V. Nagashima K. Krot A. N. Brearley A. J.
Oxygen Isotopic Composition of Apatites from Equilibrated Ordinary Chondrites: Insights into Fluid Composition and Shock Interactions [#6123]
We provide mineralogical, textural, and isotopic compositions of apatites from equilibrated ordinary chondrites (EOCs). Our objective is to gain insights into the composition of fluids and understand the thermal history of their parent asteroids.
11:15 AM
McArdle P.* Daly L. Jones R. H. Tartèse R. Burgess R. Clay P. L. O'Driscoll B. Smith W. et al.
The Qingzhen Reaction — A Fine Grained Mineral Assemblage Associated with Djerfisherite in Some EH Chondrites [#6069]
The Qinzhen Reaction is a mineral assemblage associated with djerfisherite some EH chondrites, it is predominantly comprised of porous troilite. We interpret the Qingzhen Reaction as a fluid-mediated alteration product of djerfisherite.
11:30 AM
Mészárosová N.* Skála R.
Variability of Chromium Content in Troilites of Enstatite Chondrites: A Result of Unnoticed Very Fine Daubréelite Lamellas? [#6268]
The variability of chromium concentrations in troilite from enstatite chondrites might be explained by affecting the EPMA analyses by very fine daubréelite lamellas exsolving from the host troilites.
11:45 AM
Gray M. L.* Weisberg M. K. Alexander C. M. O'D. Wang J. Ebel D. S.
Challenges of Measuring Volatiles in Enstatite Chondrites [#6276]
We analyzed H in individual silicate phases in enstatite chondrites using NanoSIMS to better understand the distribution of H and test for terrestrial contamination. We discuss the challenges of measuring the volatile content of primitive meteorites.

*presenter

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