Infrared spectroscopic characterization of organic matter associated with microbial bioalteration textures in basaltic glass

L. J. Preston, M. R.M. Izawa, N. R. Banerjee

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Microorganisms have been found to etch volcanic glass within volcaniclastic deposits from the Ontong Java Plateau, creating micron-sized tunnels and pits. The fossil record of such bioalteration textures is interpreted to extend back ∼3.5 billion years to include meta-volcanic glass from ophiolites and Precambrian greenstone belts. Bioalteration features within glass clasts from Leg 192 of the Ocean Drilling Program were investigated through optical microscopy and Fourier transform infrared (FTIR) spectroscopy of petrographic thin sections. Extended depth of focus optical microscopic imaging was used to identify bioalteration tubules within the samples and later combined with FTIR spectroscopy to study the organic molecules present within tubule clusters. The tubule-rich areas are characterized by absorption bands indicative of aliphatic hydrocarbons, amides, esters, and carboxylic groups. FTIR analysis of the tubule-free areas in the cores of glass clasts indicated that they were free of organics. This study further constrains the nature of the carbon compounds preserved within the tubules and supports previous studies that suggest the tubules formed through microbial activity.

Original languageEnglish
Pages (from-to)585-599
Number of pages15
JournalAstrobiology
Volume11
Issue number7
DOIs
Publication statusPublished - Sep 1 2011

Keywords

  • Basalt glass
  • Bioalteration
  • Infrared
  • Organics

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Space and Planetary Science

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