B23F:
(Bio-isotopic) Message in a (Rock Record) Bottle Revisited: Who Wrote It, How Did It Get Here, and What Does It Tell Us? II

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Session ID#: 31997

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:  Jeff R Havig, University of Minnesota, Earth Sciences, Minneapolis, United States
Conveners:  Alexandra v Turchyn, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, Andrew D Czaja, University of Cincinnati Main Campus, Department of Geosciences, Cincinnati, United States and William Leavitt, Dartmouth College, Earth Sciences, Hanover, 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:  Jeff R Havig, University of Minnesota, Earth Sciences, Minneapolis, United States
Index Terms:

0424 Biosignatures and proxies [BIOGEOSCIENCES]
0454 Isotopic composition and chemistry [BIOGEOSCIENCES]
0465 Microbiology: ecology, physiology and genomics [BIOGEOSCIENCES]
1099 General or miscellaneous [GEOCHEMISTRY]

Abstracts Submitted to this Session:

Unlocking Ft: Modeling thermodynamic controls and isotope fractionation factors in nutrient limited environments (Invited) (216556)
Jennifer L Druhan, University of Illinois at Urbana-Champaign, Urbana, United States, Max Giannetta, University of Illinois at Urbana Champaign, Urbana, IL, United States and Robert A. Sanford, University of Illinois at Urbana-Champaign, Department of Geology, Urbana, IL, United States
Unpacking paleoenvironmental change across OAE2 using paired d34S records of pyrite and organic matter (Invited) (228890)
Morgan R Raven, California Institute of Technology, Pasadena, CA, United States, Maya Gomes, Johns Hopkins University, Balitmore, MD, United States and David A Fike, Washington University, St. Louis, United States
Stable Fe isotope fractionation during anaerobic microbial dissimilatory iron reduction at low pH (236208)
Piyali Chanda1,2, Maximiliano J Amenabar3,4, Eric S Boyd4,5, Brian L Beard6,7 and Clark Johnson6,7, (1)Virginia Polytechnic Institute and State University, Virginia Center for Coal & Energy Research, Blacksburg, United States, (2)NASA Astrobiology Institute, Washington, DC, United States, (3)Montana State University, Department of Microbiology and Immunology, Bozeman, United States, (4)NASA Astrobiology Institute, USA, United States, (5)Montana State University, Department of Microbiology and Cell Biology, Bozeman, MT, United States, (6)NASA Astrobiology Institute, Madison, United States, (7)University of Wisconsin-Madison, Department of Geoscience, Madison, WI, United States
Sulfur isotopic constraints from a single enzyme on the cellular to global sulfur cycles (250327)
Min Sub Sim1, Jess F Adkins2, Alex L Sessions3, Victoria J Orphan3 and Shawn McGlynn2, (1)Seoul National University, Seoul, South Korea, (2)California Institute of Technology, Pasadena, CA, United States, (3)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, United States
Neo-Archaean Palaeo-Environmental Changes Determined by Microbial Activities Using Stable Isotopic Compositions. (260355)
Nathalie Grassineau1, Jie Yang2, Aubrey Zerkle2 and Euan G Nisbet3, (1)Royal Holloway University of London, Department of Earth Sciences, Egham, TW20, United Kingdom, (2)University of St Andrews, St Andrews, United Kingdom, (3)Royal Holloway, University of London, Department of Earth Sciences, Egham, United Kingdom
An Experimental Study of Low-Temperature Sulfurization of Carbohydrates Using Various Sulfides Reveals Insights into Structural Characteristics and Sulfur Isotope Compositions of Macromolecular Organic Matter in the Environment (272085)
Molly D OBeirne1, Josef P Werne1, Bart Van Dongen2 and William Gilhooly III3, (1)University of Pittsburgh, Department of Geology and Environmental Science, Pittsburgh, PA, United States, (2)University of Manchester, Manchester, United Kingdom, (3)Indiana University Indianapolis, Department of Earth & Environmental Science, Indianapolis, United States
Methane Provenance Determined by CH2D2 and 13CH3D Abundances (295723)
Issaku Edward Kohl, University of California Los Angeles, Los Angeles, CA, United States, Thomas Giunta, University of Toronto, Earth Sciences, Toronto, ON, Canada, Oliver Warr, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Jeanine L Ash, University of California Los Angeles, Los Angeles, United States, Livio Ruffine, Geo-Ocean, Univ. Brest-CNRS-IFREMER, Plouzane, France, Barbara Sherwood Lollar, University of Toronto, Department of Earth Sciences, Toronto, ON, Canada and Edward D Young, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, United States
15N indicates an active N-cycling microbial community in low carbon, freshwater sediments. (295835)
Cody Sheik, University of Minnesota Duluth, Department of Biology, Duluth, MN, United States

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