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Micron-scale mapping of sulfur cycling across the oxycline of a cyanobacterial mat

Fike, David A. and Gammon, Crystal L. and Finke, Niko and Hoehler, Tori and Turk, Kendra and Orphan, Victoria J. (2008) Micron-scale mapping of sulfur cycling across the oxycline of a cyanobacterial mat. Geochimica et Cosmochimica Acta, 72 (12). A268. ISSN 0016-7037. doi:10.1016/j.gca.2008.05.009.

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We present a parallel microgeochemical and microbiological study of μm-scale sulfur cycling within hypersaline microbial mats from Guerrero Negro, Baja California Sur, Mexico. Diel variations (day/night) in sulfur cycling were investigated in field incubations as well as in mats grown under controlled conditions in the laboratory at NASA Ames Research Center. Sulfur cycling in the laboratory mats was examined under a variety of different sulfate concentrations to evaluate the role this had on sulfide concentration and isotopic composition. Sulfate levels in the overlying water column were: 80 mM SO_4 (natural level at Guerrero Negro); 1 mM SO_4; and 200 uM SO_4. Dissolved sulfide within the mat was captured on silver discs and analyzed for its abundance and δ^(34)S isotopic composition using high resolution secondary ion mass spectrometry (SIMS) on a Cameca 7F Geo.

Item Type:Article
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URLURL TypeDescription
Fike, David A.0000-0003-2848-0328
Orphan, Victoria J.0000-0002-5374-6178
Additional Information:© 2008 Published by Elsevier Ltd.
Issue or Number:12
Record Number:CaltechAUTHORS:20130402-154755386
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Official Citation:Goldschmidt Abstracts 2008- F, Geochimica et Cosmochimica Acta, Volume 72, Issue 12, Supplement, July 2008, Pages A250-A286, ISSN 0016-7037, 10.1016/j.gca.2008.05.009.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37731
Deposited By: Tony Diaz
Deposited On:15 Apr 2013 22:52
Last Modified:09 Nov 2021 23:31

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