Petrology and geochemistry of the Northwest Africa 3368 eucrite

Kathryn G. Gardner-Vandy, Dolores H. Hill, Dante Lauretta, Yulia S. Goreva, Kenneth J. Domanik, Richard C. Greenwood, Ian A. Franchi, Marvin Killgore

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Analysis of the mineralogy, isotopic, and bulk compositions of the eucrite meteorites is imperative for understanding their origin on the asteroid 4 Vesta, the proposed parent body of the HED meteorites. We present here the petrology, mineral compositions, and bulk chemistry of several lithic components of the new brecciated basaltic eucrite Northwest Africa (NWA) 3368 to determine if all the lithologies reflect formation from one rock type or many rock types. The meteorite has three main lithologies: coarse- and fine-grained clasts surrounded by a fine-grained recrystallized silicate matrix. Silicate compositions are homogeneous, and the average rare earth element pattern for NWA 3368 is approximately 10× CI chondrites with a slight negative Eu anomaly. Major and trace element data place NWA 3368 with the Main Group-Nuevo Laredo trend. High-Ti chromites with ilmenite exsolution lamellae provide evidence of NWA 3368's history of intense metamorphism. We suggest that this meteorite underwent several episodes of brecciation and metamorphism, similar to that proposed by Metzler et al. (1995). We conclude that NWA 3368 is a monomict basaltic eucrite breccia related to known eucrites in texture and in mineral, bulk, and oxygen isotopic composition.

Original languageEnglish (US)
Pages (from-to)1052-1070
Number of pages19
JournalMeteoritics and Planetary Science
Volume46
Issue number7
DOIs
StatePublished - Jul 2011

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eucrite
petrology
geochemistry
meteorites
meteorite
lithology
silicates
metamorphism
silicate
minerals
rocks
chromites
breccia
ilmenite
chondrites
parent body
exsolution
mineralogy
chromite
mineral

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Gardner-Vandy, K. G., Hill, D. H., Lauretta, D., Goreva, Y. S., Domanik, K. J., Greenwood, R. C., ... Killgore, M. (2011). Petrology and geochemistry of the Northwest Africa 3368 eucrite. Meteoritics and Planetary Science, 46(7), 1052-1070. https://doi.org/10.1111/j.1945-5100.2011.01216.x

Petrology and geochemistry of the Northwest Africa 3368 eucrite. / Gardner-Vandy, Kathryn G.; Hill, Dolores H.; Lauretta, Dante; Goreva, Yulia S.; Domanik, Kenneth J.; Greenwood, Richard C.; Franchi, Ian A.; Killgore, Marvin.

In: Meteoritics and Planetary Science, Vol. 46, No. 7, 07.2011, p. 1052-1070.

Research output: Contribution to journalArticle

Gardner-Vandy, KG, Hill, DH, Lauretta, D, Goreva, YS, Domanik, KJ, Greenwood, RC, Franchi, IA & Killgore, M 2011, 'Petrology and geochemistry of the Northwest Africa 3368 eucrite', Meteoritics and Planetary Science, vol. 46, no. 7, pp. 1052-1070. https://doi.org/10.1111/j.1945-5100.2011.01216.x
Gardner-Vandy, Kathryn G. ; Hill, Dolores H. ; Lauretta, Dante ; Goreva, Yulia S. ; Domanik, Kenneth J. ; Greenwood, Richard C. ; Franchi, Ian A. ; Killgore, Marvin. / Petrology and geochemistry of the Northwest Africa 3368 eucrite. In: Meteoritics and Planetary Science. 2011 ; Vol. 46, No. 7. pp. 1052-1070.
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