| Reference Type | Journal (article/letter/editorial) |
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| Title | Igneous graphite in enstatite chondrites |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Rubin, Alan E. | Author |
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| Year | 1997 (October) | Volume | 61 |
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| Issue | 408 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_61/61-408-699.pdf+ |
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| DOI | doi:10.1180/minmag.1997.061.408.09Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 209 | Long-form Identifier | mindat:1:5:209:3 |
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| GUID | 0 |
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| Full Reference | Rubin, Alan E. (1997) Igneous graphite in enstatite chondrites. Mineralogical Magazine, 61 (408) 699-703 doi:10.1180/minmag.1997.061.408.09 |
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| Plain Text | Rubin, Alan E. (1997) Igneous graphite in enstatite chondrites. Mineralogical Magazine, 61 (408) 699-703 doi:10.1180/minmag.1997.061.408.09 |
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| In | (1997, October) Mineralogical Magazine Vol. 61 (408) Mineralogical Society |
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| Abstract/Notes | AbstractIgneous 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 µm 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. δ13C = −8.1 ± 2.1‰); in addition, Abee's mean δ13C 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., ∼ 5 kbar, logfO2 ∼ −10 at 1200°C), igneous graphite in asteroidal meteorites formed at much lower pressures and oxygen fugacities. |
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