B43F:
Alternative Earths: The Co-evolution of Life and its Environments from the GOE to the Rise of Complex Life II

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Session ID#: 15635

Session Description:
Geochemical data suggest a complex relationship between biological innovation and the evolution of Earth’s surface environments throughout the Proterozoic—beginning with climatic and geochemical perturbation in the wake of the Paleoproterozoic Great Oxidation Event and culminating with oxygenation, low-latitude glaciation, and the rise of animals in the Neoproterozoic. Even more intriguing is the maintenance of geochemical and climatic stasis during the intervening ‘boring billion’ of the Mesoproterozoic. Our session will explore this critical chapter of Earth’s evolution. We welcome submissions that provide novel constraints on the redox landscape of the Proterozoic ocean-atmosphere system, characterize biospheric oxygenation dynamics on a variety of spatial and temporal scales, and synthesize the spatiotemporal patterns of biological innovation during Proterozoic time. Also relevant are numerical models that explore the role of the marine biosphere in modulating Proterozoic climate, Earth system forcings involved in climatic collapse, and feedback mechanisms responsible for persistent habitability on Earth.
Primary Convener:  Stephanie L Olson, University of California Riverside, Riverside, CA, United States
Conveners:  Charles Diamond, University of California Riverside, Riverside, CA, United States and Timothy Lyons, University of California Riverside, Riverside, CA, United States
Chairs:  Timothy Lyons, Charles Diamond and Stephanie L Olson, University of California Riverside, Riverside, CA, United States
OSPA Liaison:  Stephanie L Olson, University of California Riverside, Riverside, CA, United States
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0426 Biosphere/atmosphere interactions [BIOGEOSCIENCES]
0489 Trace element cycling [BIOGEOSCIENCES]
5225 Early environment of Earth [PLANETARY SCIENCES: ASTROBIOLOGY]

Abstracts Submitted to this Session:

Biogeochemical Cycling of Methane in the Proterozoic and Its Role in the Carbon Isotope Budget (192434)
Daniel P Schrag and Thomas Laakso, Harvard University, Earth and Planetary Sciences, Cambridge, MA, United States
O2, CH4, and Sustained Mesoproterozoic Climatic Equability (157787)
Nathan D Sheldon, University of Michigan Ann Arbor, Earth and Environmental Sciences, Ann Arbor, MI, United States, Rich Fiorella, University of Michigan Ann Arbor, Ann Arbor, MI, United States and Ria L Mitchell, Natural History Museum - London, London, United Kingdom
Characterizing Marine Habitat Space on a Snowball Earth with a 3D Global Climate Model (199382)
Linda E Sohl, Columbia University of New York, Palisades, NY, United States, Mark A. Chandler, CCSR / NASA GISS, Madison, WI, United States and Francesca Lingo, CUNY City College of New York, New York, NY, United States
Model photoautrophs isolated from a Proterozoic ocean analog - aerobic life under anoxic conditions (Invited) (121378)
Trinity L Hamilton1, Dirk de Beer2, Judith Klatt3, Jennifer Macalady4, Miriam Weber5, Christian Lott5 and Arjun Chennu6, (1)University of Minnesota Twin Cities, Plant and Microbial Biology, Minneapolis, United States, (2)Max Planck Institute for Marine Microbiology, Microsensor Group, Bremen, Germany, (3)Microcosm Earth Center, Marburg, Germany, (4)Pennsylvania State University Main Campus, University Park, PA, United States, (5)HYDRA Institute for Marine Sciences / Elba Field Station, Campo nell’Elba, Italy, (6)Max Planck Institute for Marine Microbiology, Bremen, Germany
Uranium Isotope Compositions of Mid-Proterozoic Organic-rich Mudrocks: Evidence for an Episode of Increased Ocean Oxygenation at ca. 1.36 Ga and Evaluation of the Effect of Post-Depositional Hydrothermal Fluid Flow (168203)
Brian Kendall1, Shuai Yang2, Xinze Lyu1, Feifei Zhang3 and Wang Zheng4, (1)University of Waterloo, Earth and Environmental Sciences, Waterloo, ON, Canada, (2)Southwest Petroleum University, School of Geoscience and Technology, Chengdu, China, (3)Nanjing University, Nanjing, China, (4)Arizona State University, Tempe, AZ, United States
Where did eukaryotes first evolve? Revisiting Mesoproterozoic habitats in the Torridonian Supergroup, NW Scotland (Invited) (137572)
Eva Stüeken, University of Washington Seattle Campus, Seattle, WA, United States, Eric J. Bellefroid, Yale University, Geology and Geophysics, New Haven, CT, United States, Tony Prave, University of St Andrews, School of Earth & Environmental Sciences, St Andrews, United Kingdom, Dan Asael, Yale University, Dept. of Geology and Geolphysics, New Haven, CT, United States, Noah Planavsky, Yale University, Department of Earth and Planetary Sciences, New Haven, CT, United States and Timothy W Lyons, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, United States
Mid-Cryogenian Stromatolite Reefs of Central and South Australia (199788)
Charles Verdel and Matthew James Campbell, University of Queensland, St Lucia, QLD, Australia
An Independent Constraint on Marine Sulfate Levels at the Ediacaran–Cambrian Transition (158953)
Clara L Blättler1, Kristin Bergmann2 and John A Higgins1, (1)Princeton University, Princeton, United States, (2)Massachusetts Institute of Technology, Cambridge, MA, United States

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