B41A:
(Bio-isotopic) Message in a (Rock Record) Bottle Revisited: Who Wrote It, How Did It Get Here, and What Does It Tell Us? I Posters

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Session ID#: 13426

Session Description:
Signals of microbial life have expanded beyond physical fossil evidence to include molecular, elemental, and isotopic signatures. There has been an explosion in the application of stable isotope proxies used to investigate the rock record. In this exciting geochemical ‘gold-rush’ it is critical that solid connections to modern microbial, physical and (geo)chemically ground-truthed constraints be established, particularly with regard to the production and preservation of bio-isotopic signatures.

We invite contributions from any period of Earth history, including modern natural and experimental analogues, using new or established methods for detecting microbial biosignals. Our goal is to provide a platform for studies that seek to elucidate mechanisms of biosignal formation, those that illuminate the preservation potential and fidelity of such proxies. Such studies move us toward a mechanistically grounded understanding of the co-evolution of life and its expression in the geological record.

Primary Convener:  Alexandra v Turchyn, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Conveners:  Alexandra v Turchyn, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, Jeff R Havig, University of Minnesota, Earth Sciences, Minneapolis, United States and William Leavitt, Washington University in St Louis, Earth & Planetary Sciences, St. Louis, United States
Chairs:  Jeff R Havig, University of Minnesota, Earth Sciences, Minneapolis, United States and Alexandra v Turchyn, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
OSPA Liaison:  William Leavitt, Washington University in St Louis, Earth & Planetary Sciences, St. Louis, United States
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0444 Evolutionary geobiology [BIOGEOSCIENCES]
0463 Microbe/mineral interactions [BIOGEOSCIENCES]
0473 Paleoclimatology and paleoceanography [BIOGEOSCIENCES]

Abstracts Submitted to this Session:

The Effect of Molybdate Inhibition of Sulfate Reduction on the Production and Stable Isotopic Composition of Methane in Hypersaline Environments (137100)
Cheryl A Kelley1, Brad Bebout2, Jeff Chanton3, Claire S Beaudoin1, Angela M Detweiler2, Adrienne Frisbee2, Brooke E Nicholson1, Jennifer Poole1 and Amanda Tazaz4, (1)University of Missouri Columbia, Columbia, MO, United States, (2)NASA Ames Research Center, Moffett Field, CA, United States, (3)Florida State University, Department of Earth, Ocean & Atmospheric Science, Tallahassee, FL, United States, (4)Florida State University, Tallahassee, FL, United States
The Importance of Sulfate Adenylyl Transferase in S and O Fractionation by Sulfate Reducing Bacteria (159734)
Derek A Smith, Washington University in St Louis, St. Louis, MO, United States, David T Johnston, Harvard University, Earth and Planetary Sciences, Cambridge, United States and Alexander S Bradley, Washington University in St. Louis, Department of Earth, Environmental, and Planetary Sciences, St. Louis, United States
The role microbial sulfate reduction in the direct mediation of sedimentary authigenic carbonate precipitation (195848)
Alexandra v Turchyn, Kathryn Walker and Xiaole Sun, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Elucidation of the Timing and Formation Pathway(s) of Organic Sulfur Compounds in Two Modern Euxinic Systems Using Compound Specific Sulfur Isotope Analysis (CSSIA) (173972)
Molly D OBeirne1, Josef P Werne1, William Gilhooly III2, Fotios Fouskas2 and Alex L Sessions3, (1)University of Pittsburgh, Department of Geology and Environmental Science, Pittsburgh, PA, United States, (2)Indiana University Purdue University Indianapolis, Indianapolis, IN, United States, (3)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, United States
Correlating the Spatial Distribution, Speciation and Isotopic Composition of Sulfur Associated with Sedimentary Carbonate Strata, using X-ray Spectromicroscopy and Secondary Ion Mass Spectrometry (147617)
Jocelyn Richardson, Washington University in St Louis, St. Louis, MO, United States, Samuel Webb, Stanford University, Stanford Synchrotron Radiation Lightsource, Stanford, United States, Clive Jones, Washington University in St Louis, Earth, Environmental, and Planetary Sciences, St. Louis, United States and David A Fike, Washington University in St. Louis, Earth, Environmental, and Planetary Sciences, St. Louis, United States
Sulfur isotope fractionation derived from reaction-transport modeling in the Eastern Equatorial Pacific (ODP Leg 201, Site 1226) (132005)
Man-Yin Tsang, University of Washington, School of Oceanography, Seattle, United States and Ulrich G G Wortmann, University of Toronto, Department of Earth Sciences, Toronto, ON, Canada
Iron availability influences 15N-isotope fractionation during nitrogen fixation by aerobic chemoheterotroph Azotobacter vinelandii (184186)
Xinning Zhang1, Sebastian Kopf2 and Allison C. Lee1, (1)Princeton University, Dept. of Geosciences, Princeton, NJ, United States, (2)University of Colorado at Boulder, Geological Sciences, Boulder, CO, United States
Chromium isotopic fractionation in aquatic systems and foraminiferal calcite (195291)
Xiangli Shaun Wang1, Weihua Wu1, Christopher T. Reinhard2 and Noah Planavsky1, (1)Yale University, Department of Geology and Geophysics, New Haven, CT, United States, (2)Georgia Institute of Technology Main Campus, School of Earth and Atmospheric Sciences, Atlanta, GA, United States
Assessing metabolic heterogeneity in genetically homogeneous populations of bacteria using SIMS (195619)
Harry-Luke Oliver McClelland, Washington University in St Louis, St. Louis, MO, United States, David A Fike, Washington University, St. Louis, United States, Clive Jones, Washington University in St Louis, Earth, Environmental, and Planetary Sciences, St. Louis, United States and Alexander S Bradley, Washington University in St. Louis, Department of Earth, Environmental, and Planetary Sciences, St. Louis, United States
Dissolved inorganic carbon isotope signatures in ferruginous lakes: new insights into ancient carbonate isotope excursions (141169)
Chad Wittkop1, Elizabeth Swanner2, Nicholas Lambrecht2, Joshua Torgeson1, Sergei Katsev3 and Amy Myrbo4, (1)Minnesota State University Mankato, Mankato, MN, United States, (2)Iowa State University, Department of Geological and Atmospheric Sciences, Ames, IA, United States, (3)University of Minnesota Duluth, Department of Physics and Astronomy, Duluth, United States, (4)University of Minnesota Twin Cities, LacCore/CSDCO, Minneapolis, MN, United States
Unusual very positive enrichment of 13C in carbonate sediments deposited in modern hypersaline environment, Lagoa Salgada, Brazil: Indicator of salinity controlled metabolic processes (172738)
Judith A. McKenzie1, Christelle Bovier2, Anelize Bahniuk3, Morten Bugge Andersen4 and Crisogono Vasconcelos1, (1)ETH Swiss Federal Institute of Technology Zurich, Geological Institute, Zurich, Switzerland, (2)ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, (3)Universidade Federal do Paraná, Curitiba, Brazil, (4)Cardiff University, School of Earth & Ocean Sciences, Cardiff, United Kingdom
Assessing the biological contribution to microbialite growth and morphogenesis utilizing lipid biomarkers (177637)
Scott Randall Beeler, Washington University in St Louis, St. Louis, MO, United States, Fernando Gomez, Centro de Investigaciones en Ciencias de la Tierra, Córdoba, Argentina and Alexander S Bradley, Washington University in St. Louis, Department of Earth, Environmental, and Planetary Sciences, St. Louis, United States
Biosynthesis of 3-methylhopanoids by purple non-sulfur anoxygenic phototrophs (199403)
Mary Nichole Parenteau1, Linda L Jahnke1, Marisa Hayley Mayer2, Paula V Welander3, Michael Thomas Madigan4 and Megan L. Kempher4, (1)NASA Ames Research Center, Moffett Field, CA, United States, (2)Stanford University, Stanford, CA, United States, (3)Stanford University, Earth System Science, Stanford, CA, United States, (4)Southern Illinois University Carbondale, Microbiology, Carbondale, IL, United States

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