Preston, L. J.; Izawa, M. R. M. and Banerjee, N. R.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1089/ast.2010.0604|
|Google Scholar:||Look up in Google Scholar|
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.
|Item Type:||Journal Article|
|Copyright Holders:||2011 Mary Ann Liebert, Inc.|
|Keywords:||infrared; organics; bioalteration; basalt glass|
|Academic Unit/Department:||Science > Physical Sciences
|Depositing User:||Louisa Preston|
|Date Deposited:||18 Jan 2012 14:13|
|Last Modified:||24 Feb 2016 04:35|
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