What Was the Initial O-Isotope Composition of Water Accreted by the CM Chondrites?
Suttle M. D.* METSOC 2026 abstract (PDF) “Numerical modelling (O-isotope perspective) shows CM chondrite alteration is best explained by isotopically light, TFL-like water (δ18O <30‰), moderate W/R (0.3-0.7), progressive heating (20-100°C), and pulsed dissolution. A…
Alteration History Effects on Soluble Organic Matter of the Tagish Lake Meteorite
Tunney L. D.* Slater G. F. Bowman D. T. Herd C. D. K. METSOC 2026 abstract (PDF) “An analysis of the bulk dichloromethane and hot water organic compound extractions of five Tagish Lake meteorite samples,…
Mineralogy and Petrology of Tagish Lake: Insights into Parent Body Alteration and Predictions for Asteroid Bennu
Olan-Rubio V.* Herd C. D. K. Apisuk N. METSOC 2026 abstract (PDF) “We analyzed samples TL5a, TL6 and TL7 to unveil their mineralogy and petrology for the first time. This can serve as a reference…
Timescales of CM Carbonaceous Chondrite Aqueous Alteration
Haller R. L. Lee M. R.* Hodson M. E. METSOC 2026 abstract (PDF) “To make a CM chondrite, just add water and leave in a warm place for 1000 years.”
Northwest Africa 18027: A New Nakhlite
Lobanov L-A.* Schofield P. F. Jennings E. S. Petrone C. M. Downes H. et al. METSOC 2026 abstract (PDF) “Nakhlite meteorites are clinopyroxene-rich igneous rocks from Mars. Northwest Africa 18027 is a recently discovered nakhlite…
New Meteorites from the Belgica Mountains, East Antarctica
Eschrig J.* Pinto G. A. Gattacceca J. Debaille V. Pourkhorsandi H. et al. METSOC 2026 abstract (PDF) “We present a first overview of the 115 possible meteorites collected during the 2024-2025 Antarctic mission to the…
Beyond Vesta: Spectroscopic Similarities of HED and Anomalous HED Meteorites
Wong A. Y. C.* Rider-Stokes B. G. Greenwood R. C. Anand M. METSOC 2026 abstract (PDF) “The UV-Vis-NIR spectra of HED and oxygen-anomalous HED meteorites are compared to that of (4) Vesta and V-type asteroids….
Erg Atouila 001 Ungrouped Achondrite: Implications for Evolution of Na-Rich Asteroidal Crusts
Samal S.* Hu X-J. Timoner C. Hu S. Grandhomme E. et al. METSOC 2026 abstract (PDF) “EA 001 is an albitite ungrouped achondrite formed under alkaline, silica-undersaturated conditions near the IW buffer, representing a highly…
Ksar Ghilane 022 Ungrouped Achondrite: Evidence for Highly Reduced Parent Body
Oballa G.* Barbaro A. Tkalcec B. Nestola F. Brenker F. E. METSOC 2026 abstract (PDF) “Ksar Ghilane 022 is a rare pyroxenite meteorite. Analysis reveals Fe-free silicates and complex Cr-Mn-Fe sulfides. These indicate formation under…
Pb-Pb Ages of Aubrite Basalt Vitrophyres Suggest Protracted Volcanism on the Aubrite Parent Body
Guillemin E.* Cartier C. Faure F. Deligny C. Whitehouse M. J. et al. METSOC 2026 abstract (PDF) “We dated in-situ, and using the Pb-Pb systematics, aubrite basalt vitrophyres that represent volcanic lithologies among the aubrite…
Feldspathic Clasts in CH Chondrites: Fragments of Differentiated Bodies
Krot A. N.* Nagashima K. Bischoff A. METSOC 2026 abstract (PDF) “O-isotope compositions (d18O = 4.5−11.2‰, D17O = −0.8 to 0.6‰) and resolvable excesses of radiogenic 26Mg [(26Al/27Al)0 ~ 1×10−6] in plagioclase clasts (An0-99Ab0-99) in…
A CM2 Carbonaceous Chondrite-Rich Sample of Asteroid Vesta: Mount Pratt (PRA) 04401
Whitworth C. Bates H. C.* METSOC 2026 abstract (PDF) “PRA 04401 may be one of the most carbonaceous chondrite-rich howardites, exposing an extensive record of exogeneous delivery to the Vesta. We determined the composition of…
From Skyfall to Database: Italy’s Journey Toward a National Meteorite Catalog
Franza A.* Shehaj X. Pratesi G. METSOC 2026 abstract (PDF) “CAMEX is Italy’s first national effort to standardize and digitize meteorite collections. Using advanced documentation and open-access databases, it aims to unify fragmented records, enhance…
International Dynamics of Meteorite Collecting in the Early 19th Century
Le Roux R.* Gounelle M. METSOC 2026 abstract (PDF) “The paper inquires early 19th century meteorite collecting networks in Europe. It lays out a comparative study of the major European collections of meteorite, from the…
Formation Process of Quenched Angrites Inferred from Deformed Olivine Xenocrysts in Gadamis 010
Hayashi H.* Honda R. Mikouchi T. Yamaguchi A. METSOC 2026 abstract (PDF) “Gadamis 010 contains olivine xenocrysts and some shows mosaic texture with little Fe-Mg zoning but variable Ca content. This supports the “hot shock”…
Ureilites Are an Extensive Suite of Deep to Shallow Mantle Samples from a Dwarf Protoplanet
Tomkins A. G.* Jennings L. A. Kirby R. S. METSOC 2026 abstract (PDF) “We use a combination of thermometry, petrology and thermal modelling to explore the characteristics of the Ureilite Parent Body mantle, and the…
Evaluating H2O Sources in the Ribbeck Aubrite
Hua F. T. S.* Stalder R. Joachim-Mrosko B. Hamann C. Hecht L. et al. METSOC 2026 abstract (PDF) “OH measured in Ribbeck enstatite by IR spectroscopy is non-structural and decreases after heating, indicating terrestrial adsorption….
The Brachinites and Brachinite-Like Ungrouped Achondrites: A Unique Meteorite Group
Cuppone T.* Pratesi G. Casalini M. Stephant A. Anand M. et al. METSOC 2026 abstract (PDF) “A complete petro-mineralogic, geochemical and O-Cr isotopic survey perfomed on 15 meteorites (5 brachinites and 10 ungrouped brachinite-like) highlights…
A Spinifex-Textured Andesite in Erg Chech 002 that Bears on the Achondrite’s Origin and Age
Sanders I. S.* Simms M. J. Guyett P. C. METSOC 2026 abstract (PDF) “A fine-grained, spinifex-textured second andesite in the oldest-known achondrite, Erg Chech 002, opens new discussion of the meteorite’s cooling history, its magmatic…
Deciphering the Primary Melt of Erg Chech 002 from the Study of Megacrysts and Melt Inclusions
Grangé A.* Collinet M. Hamann C. Kaufmann F. E. D. Greshake A. METSOC 2026 abstract (PDF) “New melt inclusion data show that EC 002 derived from a more primitive, low-viscosity melt than previously inferred, reshaping…
A Plagioclase Xenocryst in the Oldest Quenched Angrite Northwest Africa 12879: Implications for the Relationship Between Angrite Sub-Groups and the Igneous Activity of Angrite Parent Body
Honda R.* Hayashi H. Bizzarro M. Connelly J. N. Bollard J. et al. METSOC 2026 abstract (PDF) “We studied mineralogy and cosmochemistry of NWA 12879 angrite, which contains a plagioclase xenocryst. Our results indicate that…
Formation Time and Thermal Evolution of the Angrite Parent Body
Neumann W.* Bouvier A. Reger P. M. Trieloff M . METSOC 2026 abstract (PDF) “Thermal evolution model fits to the chronology of angrites indicate a parent body accretion time between 0.6 Ma and 0.8 Ma…
Resolving Complex Mass Interferences in TOF-SIMS Spectra of Extraterrestrial Organics in a Carbonaceous Chondrite
Nomura A.* Moritani K. Nakamura T. Eguchi N. Sano N. et al. METSOC 2026 abstract (PDF) “Developed a preliminary correlation-based analysis for GCIB-TOF-SIMS to resolve mass interferences, enabling initial identification of organics in the carbonaceous…
Thermal Evolution of Volatile-Rich Planetesimals: Implications for Lithological Diversity in Ryugu and CI Chondrites
Yamazaki S.* Mikouchi T. Zolensky M. E. METSOC 2026 abstract (PDF) “We modeled thermal evolution of volatile-rich planetesimals to explain lithological diversity in Ryugu and CI chondrites. Body size (50–100 km), accretion timing (~2–3 Myr),…
Alteration of Meteorites in the Dense Collection Areas of East Antarctica: New Constraints Through the Belgica Mountains Collection
Pinto G. A.* Tollenaar V. Debaille V. Pourkhorsandi H. Gattacceca J. et al. METSOC 2026 abstract (PDF) “We analyzed the weathering degree of all the newly collected meteorites from the ULTIMO mission to the Belgica…
