Bacterial production of methane and its influence on ground-water chemistry in east-central Texas aquifers

Research Article| June 01, 1989 Bacterial production of methane and its influence on ground-water chemistry in east-central Texas aquifers Ethan L. Grossman; Ethan L. Grossman 1Department of Geology, Texas A&M University, College Station, Texas 77843 Search for other works by this author on: GSW Google Scholar B. Keith Coffman; B. Keith Coffman 1Department of Geology, Texas A&M University, College Station, Texas 77843 Search for other works by this author on: GSW Google Scholar Steven J. Fritz; Steven J. Fritz 2Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47097 Search for other works by this author on: GSW Google Scholar Hideki Wada Hideki Wada 3Institute of Geosciences, Shizuoka University, Shizuoka City 422, Japan Search for other works by this author on: GSW Google Scholar Geology (1989) 17 (6): 495–499. https://doi.org/10.1130/0091-7613(1989)017<0495:BPOMAI>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Ethan L. Grossman, B. Keith Coffman, Steven J. Fritz, Hideki Wada; Bacterial production of methane and its influence on ground-water chemistry in east-central Texas aquifers. Geology 1989;; 17 (6): 495–499. doi: https://doi.org/10.1130/0091-7613(1989)017<0495:BPOMAI>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Geochemical and isotopic data for methane and ground water indicate that gaseous hydrocarbons in Eocene aquifers in east-central Texas form by bacterial processes. The δ13C values of methane from five wells in the clay-rich Yegua and Cook Mountain Formations range from -71‰ to -62‰. Methane from ten wells in the cleaner sands of the Sparta and Queen City Formations have δ13C values between -57‰ and -53‰. The carbon isotopic difference between methanes from the Yegua and Sparta aquifers is comparable to the isotopic difference in sedimentary organic matter from outcrops of the units, suggesting substrate control on the δ13C of bacterial methane. Hydrogen isotopic compositions of methane from the aquifers are similar, averaging -181‰. This high value suggests methane production predominantly by CO2 reduction.The δ13C of dissolved inorganic carbon (DIC) in high bicarbonate waters increases from about -20‰ to 0‰ with increasing DIC. Mass-balance calculations indicate that the DIC added to the ground water has δ;13C values as high as 10‰. This 13C-enriched carbon is predominantly derived from CO2 production by fermentation and anaerobic oxidation reactions combined with CO2 consumption by CO2 reduction. This process is responsible for high bicarbonate contents in these and probably other Gulf Coast ground waters. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.