Formation of vesicles in asteroidal basaltic meteorites

Timothy J. McCoy, Richard A. Ketcham, Lionel Wilson, Gretchen K. Benedix, Meenakshi Wadhwa, Andrew M. Davis

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

Rare asteroidal vesicular basalts have previously been thought to form in surficial lava flows with CO as the vesicle-forming gas. However, vesicular lava flows are unlikely on small, airless bodies such as asteroids. To unravel the origin of these rocks, we analyzed vesicle sizes and abundances for two angrites and two eucrites using high-resolution X-ray computed tomography and conducted numerical modeling of bubble formation in a dike of ascending magma. Modeling results indicate that thin (< 30 cm wide) dikes are trapped at ∼ 5 km depth where ∼ 75 ppm of CO and CO2 contribute equally to vesicle formation. Vesicular eucrites were metamorphosed in this deep-seated environment, the gas was lost, and they were excavated by impacts.

Original languageEnglish (US)
Pages (from-to)102-108
Number of pages7
JournalEarth and Planetary Science Letters
Volume246
Issue number1-2
DOIs
StatePublished - Jun 15 2006
Externally publishedYes

Keywords

  • asteroids
  • basalts
  • meteorites
  • vesicles
  • volatiles

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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    McCoy, T. J., Ketcham, R. A., Wilson, L., Benedix, G. K., Wadhwa, M., & Davis, A. M. (2006). Formation of vesicles in asteroidal basaltic meteorites. Earth and Planetary Science Letters, 246(1-2), 102-108. https://doi.org/10.1016/j.epsl.2006.04.002