INVESTIGADORES
VARELA Maria Eugenia
artículos
Título:
The Vaca Muerta mesosiderite: The path under which Fe-Ni alloy +C phases could have formed.
Autor/es:
MARIA EUGENIA VARELA; HWANG, SHYH-LUNG; SHEN P; GARCIA, LAURA NOEL; SAAVEDRA M.; MARUOKA T,; M. BOSE
Revista:
METEORITICS & PLANETARY SCIENCE
Editorial:
METEORITICAL SOC
Referencias:
Año: 2024 p. 1 - 14
ISSN:
1086-9379
Resumen:
The combined SEM and TEM studies on the metal (Fe-Ni alloy C) portion of theVaca Muerta mesosiderite reveal structural and compositional evidence at micro to nanoscale,which sheds light on the solidification of taenite + graphite as a cement, and later solid-stateprecipitation process for the kamacite formation as grain boundary allotriomorph. Besides, it isproposed that the graphite veinlets formed through a complex partial melting process followedby a solidification toward the final eutectic transient coupled with the solid-state precipitationand later decomposition ordering of taenite. The presence of defects and taenite in graphitesignal formation in a liquid environment. The δ13C values of graphite in the graphite-rich areas(e.g., ranging from 0.8 1.7 to +15.3 2.5) suggest a short-circuit diffusion path for Cisotope fractionation
