V12B:
What Do We Really Know about Early Earth? I

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Session ID#: 18144

Session Description:
Geologic evidence of the conditions of early Earth is sparse, forcing our models, experiments, and ultimately interpretations of early Earth processes to be based upon limited physical evidence. As we attempt to make more from less, many of us find ourselves asking: What do we really know about early Earth? From the depths of the inner core to the atmosphere-space boundary, how has the Earth system changed? This intentionally provocative framing forces us to reexamine long-held assumptions about the evolution of climate, tectonics, and biogeochemical cycles, with implications for our understanding of life’s origins, of the future of the Earth system, and of early Earth’s suitability as an analog for exoplanet habitability. We invite contributions from the solid Earth, biogeoscience, ocean, and atmosphere communities that help reassess or reaffirm what we think we know about the early Earth system and its subsequent evolution.
Primary Convener:  Ariel D Anbar, Arizona State University, School of Earth and Space Exploration and School of Molecular Sciences, Tempe, AZ, United States; Arizona State University, School of Earth & Space Exploration and School of Molecular Sciences, Tempe, AZ, United States
Conveners:  Chadlin M Ostrander, Arizona State University, School of Earth and Space Exploration, Tempe, United States, Aleisha Johnson, Arizona State University, School of Earth & Space Exploration, Tempe, AZ, United States and Cin-Ty Lee, Rice University, Houston, TX, United States
Chairs:  Chadlin M Ostrander, Arizona State University, School of Earth and Space Exploration, Tempe, United States and Aleisha Johnson, Arizona State University, School of Earth & Space Exploration, Tempe, AZ, United States
OSPA Liaison:  Chadlin M Ostrander, Arizona State University, School of Earth and Space Exploration, Tempe, United States

Cross-Listed:
  • B - Biogeosciences
Index Terms:

0325 Evolution of the atmosphere [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0444 Evolutionary geobiology [BIOGEOSCIENCES]
3621 Mantle processes [MINERALOGY AND PETROLOGY]
5225 Early environment of Earth [PLANETARY SCIENCES: ASTROBIOLOGY]

Abstracts Submitted to this Session:

What Do We Really Know About Early Earth? Less Than We Claim. (150333)
T. Mark Harrison, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, Elizabeth A Bell, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, United States and Patrick Boehnke, University of Chicago, Chicago, IL, United States
How Representative a View of the Hadean and Early Archean Can We Build From Detrital Zircon Records? (178478)
Elizabeth A Bell, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, United States, T. Mark Harrison, University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States and Patrick Boehnke, University of Chicago, Chicago, IL, United States
What is the Emerging Knowledge of the Early Earth from the Oldest (>3.6 Ga) Rocks? (170788)
Vickie C Bennett, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia and Allen P. Nutman, University of Wollongong, GeoQuEST, School of Earth and Environmental Sciences, Wollongong, Australia
What do we really know about Earth’s early crust? (Invited) (135216)
Roberta L Rudnick, University of California Santa Barbara, Department of Earth Science and Earth Research Institute, Santa Barbara, CA, United States and Ming Tang, University of Maryland College Park, Department of Geology, College Park, MD, United States
Comparison of oxygen fugacities of S-type granites across the Archean-Proterozoic boundary (153969)
Claire E Bucholz1, John M Eiler2, Edward M Stolper2 and Frederick B Breaks3, (1)California Institute of Technology, Pasadena, United States, (2)California Institute of Technology, Pasadena, CA, United States, (3)Consulting Geologist, Sudbury, ON, Canada
Deep, saline and isolated crystalline brines: looking for a parent body (159213)
Thomas Giunta1, Cheyenne Sunset Sica1, Chelsea N Sutcliffe2, Oliver Warr3, Jill M McDermott4, Chris J. Ballentine5 and Barbara Sherwood Lollar1, (1)University of Toronto, Earth Sciences, Toronto, ON, Canada, (2)University of Toronto, Toronto, ON, Canada, (3)University of Toronto, Department of Earth Sciences, Toronto, ON, Canada, (4)Lehigh University, Department of Earth and Environmental Sciences, Bethlehem, United States, (5)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
What Do We Really Know About the Earth's Early Atmosphere? (Invited) (165755)
David C. Catling, University of Washington, Department of Earth and Space Sciences, Seattle, United States, Joshua Krissansen-Totton, University of Washington Seattle Campus, Department of Earth and Space Sciences, Seattle, United States and Kevin J Zahnle, NASA Ames Research Center, Moffett Field, CA, United States
Minor Sulfur Isotope Constraints on the composition of Earth’s Archean atmosphere (148177)
Mark Claire, University of St Andrews, Department of Earth and Environmental Sciences, St Andrews, KY16, United Kingdom

See more of: Volcanology, Geochemistry and Petrology