IGNEOUS GRAPHITE IN ENSTATITE CHONDRITES
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dc.contributor.author | Rubin A.E. | |
dc.date.accessioned | 2020-12-14T07:02:07Z | |
dc.date.available | 2020-12-14T07:02:07Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=38740512 | |
dc.identifier.citation | Mineralogical Magazine, 1997, , 5, 699-703 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20718 | |
dc.description.abstract | Igneous graphite, a rare constituent in terrestrial mafic and ultramafic rocks, occurs in three EH and one EL enstatite chondrite impact-melt breccias as 2-150 mu m long euhedral laths, some with pyramidal terminations. In contrast, graphite in most enstatite chondrites exsolved from metallic Fe-Ni as polygonal, rounded or irregular aggregates. Literature data for five EH chondrites on C combusting at high temperatures show that Abee contains the most homogeneous C isotopes (i.e. delta(13)C = -8.1 +/- 2.1%); in addition, Abee's mean delta(13)C value is the same as the average high-temperature C value for the set of five EH chondrites. This suggests that Abee scavenged C from a plurality of sources on its parent body and homogenized the C during a large-scale melting event. Whereas igneous graphite in terrestrial rocks typically forms at relatively high pressure and only moderately low oxygen fugacity (e.g., similar to 5 kbar, logf(O2) similar to -10 at 1200 degrees C), igneous graphite in asteroidal meteorites formed at much lower pressures and oxygen fugacities. | |
dc.title | IGNEOUS GRAPHITE IN ENSTATITE CHONDRITES | |
dc.type | Статья |
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