NAI
Clark Johnson
University of Wisconsin, Madison
Current Projects
- Developing Methods for Life Detection on Mars and in Mars Analog Environments — 2016 NAI
- Project 3C: A Redox-Stratified Ocean 3.2 Billion Years Ago — 2015 NAI
- Project 3B: Biologically Recycled Continental Iron Is a Major Component in Banded Iron Formations — 2015 NAI
- Project 2B: Cation Content of Carbonate Minerals as a pCO2 Proxy: Inorganic Synthesis Experiments — 2015 NAI
- Project 2A: Application of the 13C-18O Clumped Isotope Thermometer to the Ancient Earth — 2015 NAI
- Project 2G: Iron Isotope Fractionations Among Oxide Minerals Under Acidic Conditions — 2014 NAI
- Project 3C: The Role of Early Continental Weathering in Providing a Habitable Planet — 2014 NAI
- Project 1D: Iron Biogeochemistry in Chocolate Pots Hot Spring, Yellowstone National Park — 2014 NAI
- Project 2C: Developing the 13C-18O Clumped Isotope Thermometer — 2014 NAI
- Project 2D: Magnesium Isotopes in Carbonates as a Tracer of Marine Conditions in the Early Earth — 2014 NAI
- Project 2F: Silicon Isotopes as a Tracer of the Coupled Fe-Si Cycle in the Archean — 2014 NAI
- Project 3D: A Microbial Iron Shuttle in Early Earth Marine Basins — 2014 NAI
- Preparation of Review Articles — 2013 NAI
- The Astrobiology Walk — 2013 NAI
- Project 2A: Magnesium Isotope Fractionation Between Brucite [Mg(OH)2] and Mg Aqueous Species — 2013 NAI
- Project 2B: Origin of Carbonates: Environmental Proxies and Formation Pathways — 2013 NAI
- Project 2C: Calibrating the [^13^]C-[^18^]O (“clumped”) Isotope Temperature Scale — 2013 NAI
- Project 3A: Banded Iron Formation Deposition Across the Archean-Proterozoic Boundary — 2013 NAI
- Project 4A: Better, Faster, Smaller Fe Isotope Analysis on Iron Oxides and Sulfides by Femtosecond Laser Ablation: Aerosol Characterization and the Influence of Ablation Cells — 2013 NAI
- Project 5A: Improvement in the Accuracy of Stable Isotope Analysis by Laser Ablation — 2012 NAI
- Project 3C: In Situ Fe Isotope Analysis of Iron Formations — 2012 NAI
- Project 3D: Constraints on Oxygen Contents in Earth’s Early Atmosphere and Implications for Evolution of Photosynthesis — 2012 NAI
- Project 4E: Preliminary Studies of Fe Isotope Biogeochemistry in Fe-Rich Yellowstone National Park Hot Springs — 2012 NAI
- Project 3C: Integration of Multiple Isotope Proxies to Study the Pre-GOE Oxygenation of the Earth — 2011 NAI
- Project 5B: Magnesium Isotope Fractionation Between Calcite and Aqueous Mg — 2011 NAI
- Project 4C: Iron Isotope Geochemistry in Biogenic Magnetite-Bearing Lake Sediments — 2011 NAI
- Project 4B: Iron Isotope Biosignatures - Synthesis of Abiotic and Biotic Laboratory Experiments — 2011 NAI
- Project 1C: U-Th-Pb Geochronology of the 3.4 Ga Apex Basalt Suggests an Anoxic Early Earth Atmosphere — 2011 NAI
- Project 1B: U-Th-Pb Geochronology and Fe Isotopes of the 3.4 Ga Marble Bar Chert Indicates Early Anoxygenic Photosynthesis — 2011 NAI
- Project 1A: Rb-Sr Geochronology of ALH84001 Demonstrates Early Weathering on Mars — 2011 NAI
- Project 3C: Iron Isotope Biosignatures: Laboratory Studies and Modern Environments — 2010 NAI
- Project 4B: Development of Laser Ablation-Miniature Mass Spectrometer (LA-MMS) for Geochronology and Geochemistry of Martian Rocks — 2010 NAI
- Project 5D: The Rock That Started It All: Geochronology of Mars Meteorite ALH84001 — 2010 NAI
- Project 5C: Fluid-Mineral Fractionation of Mg Isotopes and Tracing the Origin of Sulfate Minerals — 2010 NAI
- Project 3A: Quantifying the Amount of Free Oxygen in the Neoarchean Photic Zone Through Combined Fe and Mo Isotopes — 2010 NAI
- Project 3B: Do Iron-Rich Carbonates From Banded Iron Formations Record Ancient Seawater? — 2010 NAI
- Co-Evolution of Microbial Metabolisms in the Neoarchean and Paleoproterozoic — 2009 NAI
- Chemolithotrophic Microbial Oxidation of Insoluble Fe(II)-Bearing Minerals — 2009 NAI
- Project 5: Vistas of Early Mars: In Preparation for Sample Return — 2009 NAI
- Iron Isotope Biosignatures: Laboratory Studies and Modern Environments — 2009 NAI
- New Frontiers in Micro-Analysis of Isotopic Compositions of Natural Materials: Development of Fe Isotopes — 2009 NAI
- Development of Laser Ablation-Electron Impact Ionization-Miniature Mass Spectrometer (LA-EI-MMS) for In-Situ Chemical and Isotopic Measurements of Martian Rocks — 2009 NAI
- Laser Ablation-Electron Impact Ionization-Miniature Mass Spectrometer (LA-EI-MMS) for In-Situ Geochronology and Hydrology of Martian Rocks — 2009 NAI
- Iron Isotope Biosignatures: Laboratory Studies and Modern Environments — 2008 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere (Ohmoto) — 2007 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere (Ohmoto) — 2006 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere - Ohmoto — 2005 NAI
- The Evolution of a Habitable Planet — 2004 NAI
- Fe Isotope Biosignatures — 2003 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere - Ohmoto — 2003 NAI
- Fe Isotope Biosignatures — 2002 NAI
- Fe Isotope Biosignatures Group — 2001 NAI
- Fe Isotope Biosignatures — 2000 NAI
- View all 53 projects
NAI Project Collaborators
- Project collaborators as reported by the latest NAI Annual Report.
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Catherine Woodward
Institute for Biology Education - Mazomanie Outreach Outpost
Collaborated on 1 Project
Publications
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Li, W., Czaja, A. D., Van Kranendonk, M. J., Beard, B. L., Roden, E. E., & Johnson, C. M. (2013). An anoxic, Fe(II)-rich, U-poor ocean 3.46 billion years ago. Geochimica et Cosmochimica Acta, 120, 65–79. doi:10.1016/j.gca.2013.06.033
See Project
CAN 6
