Origin and age of metal veins in Canyon Diablo graphite nodules

1Connor D. Hilton,1Richard D. Ash,1Philip M. Piccoli,2David A. Kring,3Timothy J. McCoy,1Richard J. Walker
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13464]
1Department of Geology, University of Maryland, College Park, Maryland, 20742 USA
2Lunar and Planetary Institute, USRA, Houston, Texas, 77058 USA
1Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, District of Columbia, 20560 USA
Published by arrangement with John Wiley & Sons

Previous studies attributed the origin of metal veins penetrating graphite nodules in the Canyon Diablo IAB main group iron meteorite to condensation from vapor or melting of host metal. Abundances of 16 siderophile elements measured in kamacite within vein and host meteorite are most consistent with an origin by melting of the host metal followed by fractional crystallization of the liquid. The presence of the veins within graphite nodules may be explained by impact, as peak shock temperatures, and thus the most likely areas to undergo metal melting are at metal–graphite interfaces. The origin of the veins is constrained by Re‐Os chronometry to have occurred early (>4 Ga) in solar system history.

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