| Autor: |
Varela, M. E., Hwang, S.‐L., Shen, P., Garcia, L. N., Saavedra, M., Maruoka, T., Bose, M. |
| Předmět: |
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| Zdroj: |
Meteoritics & Planetary Science; Mar2024, Vol. 59 Issue 3, p421-434, 14p |
| Abstrakt: |
The combined SEM and TEM studies on the metal (Fe‐Ni alloy ±C) portion of the Vaca 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‐state precipitation process for the kamacite formation as grain boundary allotriomorph. Besides, it is proposed that the graphite veinlets formed through a complex partial melting process followed by a solidification toward the final eutectic transient coupled with the solid‐state precipitation and later decomposition ordering of taenite. The presence of defects and taenite in graphite signal 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 C isotope fractionation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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