Dataset: Porewater Geochemistry
Deployment: AT15-40

Porewater geochemistry data for sediment samples that were included in global seep survey
Principal Investigator: 
Dr Andreas P. Teske (University of North Carolina at Chapel Hill, UNC-Chapel Hill)
Co-Principal Investigator: 
Dr Daniel B. Albert (University of North Carolina at Chapel Hill, UNC-Chapel Hill)
Dr Barbara J. MacGregor (University of North Carolina at Chapel Hill, UNC-Chapel Hill)
Dr Christopher S. Martens (University of North Carolina at Chapel Hill, UNC-Chapel Hill)
BCO-DMO Data Manager: 
Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)
Current State: 
Final no updates expected
18 July 2012
Version Date: 

Porewater geochemistry of Guaymas Basin hydrothermal sediments (Southern Spreading segment, 27°00.44N and 111°24.55W, 2000 m water depth) including methane, CO2, and sulfate. Also see the Sulfides dataset for sulfide measurments from these cores.

During two R/V Atlantis cruises to Guaymas Basin, the association of Beggiatoa mats with hydrothermal seepage and the habitat preferences of various Beggiatoa types were investigated by geochemical and microbiological characterization of sediments underneath Beggiatoa mats in combination with temperature measurements down to 40 cm sediment depth. In particular, temperature profiles and corresponding sulfide, sulfate, dissolved inorganic carbon (DIC), delta 13C-DIC, methane, and delta 13C-methane gradients from mats exhibiting orange-to-white color transitions were examined to elucidate hydrothermal fluid delivery and/or tolerance associated with differently colored Beggiatoa types. (McKay et al. 2012)

Geochemical data on Guaymas sediment porewater chemistry are published or referenced in the following:
Jennifer Biddle, Zena Cardman, Howard Mendlovitz, Daniel B. Albert, Karen G. Lloyd, Antje Boetius, and Andreas Teske. 2012. Anaerobic oxidation of methane at different temperature regimes in Guaymas Basin hydrothermal sediments. The ISME Journal (2012) 6: 1018-1031. doi: 10.1038/ismej.2011.164. Epub: 2011 Nov 17

McKay, Luke J., Barbara J. MacGregor, Jennifer F. Biddle, Howard P. Mendlovitz, Dan Hoer, Julius S. Lipp, Karen G. Lloyd, and Andreas P. Teske. 2012. Spatial heterogeneity and underlying geochemistry of phylogenetically diverse orange and white Beggiatoa mats in Guaymas Basin hydrothermal sediments. Deep-Sea Research I, in press.

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