Journal Article

IMPULSE-2025-00151

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Experimental constraints on the origin of metal and carbon in ureilite meteorites

Walte, N. P. (Corresponding author)MLZ* ; Collinet, M. ; Goodrich, C. A.

2025
Wiley-Blackwell Hoboken, NJ

Please use a persistent id in citations: doi:10.1111/maps.70063

Abstract: Ureilites are carbon-rich ultramafic achondrites that display unique textures,including strips of metal and carbon phases situated along grain boundaries and infractures. Shock metamorphism observed in ureilites suggests an episode of brittledeformation caused by impact disruption of their parent body. The origin of carbon andmetal has long been debated; in particular, whether either is endogenous or at least partlyexogenous. We conducted experiments to simulate the metal-carbon textures and constraintheir origin. Two model systems were investigated: (A) intrusion of FeS melt (analog formetal) into an olivine matrix containing dispersed graphite and (B) intrusion of graphiteinto a matrix containing dispersed FeS. After static annealing at 0.5–2 GPa and 1300°C, thesamples were deformed at high strain rates to simulate an impact event. The microstructuresof system A most closely resembled the textures observed in medium to low-shock maingroup ureilites, supporting an endogenous origin of carbon and a largely exogenous originof metal. The grain boundary linings of ureilites were formed by impactor metal thatintruded along grain boundaries and mixed with locally mobilized carbon. Hence, weestablish a direct connection between the metal-carbon textures in ureilites and the collisionhistory of their parent body.

Keyword(s): Earth, Environment and Cultural Heritage (1st) ; Geosciences (2nd)

Note: open access

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Contributing Institute(s):

1. SAPHIR (SAPHIR)

Experiment(s):

1. SAPHiR : Six Anvil Press for High pressure Radiography and diffraction (SR5a)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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