NAI
Hiroshi Ohmoto
Pennsylvania State University
Current Projects
- Biosignatures in Ancient Rocks - Ohmoto Group — 2014 NAI
- Biosignatures in Extraterrestrial Settings — 2014 NAI
- Biosignatures in Ancient Rocks - Kasting Group — 2013 NAI
- Biosignatures in Extraterrestrial Settings — 2013 NAI
- Biosignatures in Ancient Rocks - Ohmoto Group — 2013 NAI
- Biosignatures in Extraterrestrial Settings — 2012 NAI
- Biosignatures in Ancient Rocks — 2012 NAI
- Biosignatures in Extraterrestrial Settings — 2011 NAI
- Biosignatures in Ancient Rocks — 2011 NAI
- Biosignatures in Ancient Rocks — 2010 NAI
- Project 5: Geological-Biological Interactions — 2010 NAI
- Biosignatures in Extraterrestrial Settings — 2010 NAI
- Biosignatures in Extraterrestrial Settings — 2009 NAI
- Biosignatures in Ancient Rocks — 2009 NAI
- Project 5: Geological-Biological Interactions — 2009 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere (Ohmoto) — 2007 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere (Ohmoto) — 2006 NAI
- Evolution of a Habitable Planet (Capo) — 2005 NAI
- Evolution of a Habitable Planet (Stewart) — 2005 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere - Ohmoto — 2005 NAI
- The Evolution of a Habitable Planet — 2004 NAI
- Laboratory Microbial Simulations: Astrobiological Signatures — 2004 NAI
- Geochemical Record of the Early Terrestrial Environment — 2004 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere - Ohmoto — 2004 NAI
- Evolution of Atmospheric O2, Climate and the Terrestrial Biosphere - Capo — 2003 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere - Ohmoto — 2003 NAI
- Evolution of Atmospheric O2, Climate, and the Terrestrial Biosphere - Stewart — 2003 NAI
- Fe Isotope Biosignatures — 2003 NAI
- Evolution of Atmospheric O2, Climate and Biosphere - Rosemary C. Capo — 2002 NAI
- Fe Isotope Biosignatures — 2002 NAI
- Evolution of Atmospheric O2, Climate, and Biosphere - Hiroshi Ohmoto — 2002 NAI
- Evolution of Atmospheric O2, Climate, and the Terrestrial Biosphere - H. Ohmoto — 2001 NAI
- Evolution of Atmospheric O2, Climate, and the Terrestrial Biosphere — 2001 NAI
- Evolution of Atmospheric O2, Climate, and the Terrestrial Biosphere/Causes and Consequences of the Diversification and Extinction of Metazoans - Rosemary C. Capo, Brian W. Stewart — 2000 NAI
- Astrobiology Education and Public Outreach — 2000 NAI
- Evolution of Atmospheric O2, Climate and the Terrestrial Biosphere: Approaches From Field-Oriented Geochemical Investigations. Causes and Consequences of the Diversification and Extinction of Metazoans: Field, Geochemical and Paleontological Investigations. - Ohmoto 3 — 2000 NAI
- Evolution of Atmospheric O2, Climate and the Terrestrial Biosphere: Approaches From Field-Oriented Geochemical Investigations. Causes and Consequences of the Diversification and Extinction of Metazoans: Field, Geochemical and Paleontological Investigations. - Ohmoto 2 — 2000 NAI
- Evolution of Atmospheric O2, Climate and the Terrestrial Biosphere: Approaches From Field-Oriented Geochemical Investigations. Causes and Consequences of the Diversification and Extinction of Metazoans: Field, Geochemical and Paleontological Investigations. - Ohmoto 1 — 2000 NAI
- "Alien Hunting" on What's in the News — 2000 NAI
- View all 39 projects
NAI Project Collaborators
- Project collaborators as reported by the latest NAI Annual Report.
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Publications
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Hoashi, M., Bevacqua, D. C., Otake, T., Watanabe, Y., Hickman, A. H., Utsunomiya, S., & Ohmoto, H. (2009). Primary haematite formation in an oxygenated sea 3.46 billion years ago. Nature Geosci, 2(4), 301–306. doi:10.1038/ngeo465
See Project See Project -
Ohmoto, H., Watanabe, Y., Lasaga, A. C., Naraoka, H., Johnson, I., Brainard, J., & Chorney, A. (2014). Oxygen, iron, and sulfur geochemical cycles on early Earth: Paradigms and contradictions. Earth’s Early Atmosphere and Surface Environment, None, 55–95. doi:10.1130/2014.2504(09)
See Project -
Otake, T., Wesolowski, D. J., Anovitz, L. M., Allard, L. F., & Ohmoto, H. (2010). Mechanisms of iron oxide transformations in hydrothermal systems. Geochimica et Cosmochimica Acta, 74(21), 6141–6156. doi:10.1016/j.gca.2010.07.024
See Project - Anbar, A.D., Boyd, E.S., Buick, R., Claire, M., Des Marais, D., Domagal-Goldman, S., Eigenbrode, J., Erwin, D., Freeman, K., Hazen, R., Johnson, C., Lyons, T., Meadows, V., Ohmoto, H., Ono, S., Peters, J.W., Shapiro, B., Summons, R. & Walter, M. (2010). An Archean biosphere initiative [abstract 5593]. Astrobiology Science Conference 2010. See Project
- Brainard, J.L. & Ohmoto, H. (In Review). Effects of climatic and sea-level changes on the marine methane hydrate inventory. Nature Climate Change. See Project
- Hamasaki, H., Watanabe, Y. & Ohmoto, H. (In Preparation). An experimental investigation of multiple sulfur isotope fractionations during heterogeneous reactions between SO2 and activated carbon. Geochimica et Cosmochimica Acta. See Project
- Hoashi, M., Watanabe, Y. & Ohmoto, H. (2009). Primary hematite formation in an oxygenated deep sea 3.46 billion years ago. 19th Goldschmidt conference, Davos, Switzerland. Geochim. Cosmochim. Acta, 73(13S): A536. See Project
- Hoashi, M., Watanabe, Y. & Ohmoto, H. (2009). Primary hematite formation in an oxygenated deep sea 3.46 billion years ago. Goldschmidt conference. Davos, Switzerland. See Project See Project
- Johnson, C.M., Yamaguchi, K.E., Poulson, S.R., Ohmoto, H. & Beard, B.L. (2009). Fe, S, and C isotopes record great microbial diversity in the Neoarchean. 19th Goldschmidt conference, Davos, Switzerland. Geochim. Cosmochim. Acta, 73(13S): A600. See Project
- Johnson, I., Watanabe, Y., Stewart, B. & Ohmoto, H. (2009). Earth’s oldest (~3.4 Ga) lateritic paleosol in he Pilbara Craton, Western Australia. Goldschmidt conference. Davos, Switzerland. See Project See Project
- Johnson, I., Watanabe, Y., Stewart, B. & Ohmoto, H. (2009). Earth’s oldest (~3.4 Ga) lateritic paleosol in the Pilbara craton, Western Australia. 19th Goldschmidt conference, Davos, Switzerland. Geochim. Cosmochim. Acta, 73(13S): A601. See Project
- Ohmoto, H. & House, C.H. (2012, Sbmitted). Did continental growth end the anaerobic world. Nature Geosciences. See Project
- Ohmoto, H. (2009). Redox evolution of volcanic gas through geologic time. 19th Goldschmidt Conference, Davos, Switzerland. Geochim. Cosmochim. Acta, 73(13S): A965. See Project
- Ohmoto, H. (2009). Redox evolution of volcanic gas through geologic time. Goldschmidt conference. Davos, Switzerland. See Project See Project See Project
- Ohmoto, H. (2010, In Press). Dioxygen. In: Henderson, J.C. & et al. (Eds.). Encyclopedia of Astrobiology. See Project
- Ohmoto, H., Bevacqua, D.C. & Watanabe, Y. (2009). Alteration of submarine volcanic rocks in oxygenated Archean oceans. American Geophysical Union Annual Meeting. San Francisco, CA. See Project See Project
- Ohmoto, H., Bevacqua, D.C. & Watanabe, Y. (2010). Hydrothermal alteration chemistry of Archean submarine volcanic rocks: evidence for a fully oxygenated atmosphere-ocean system since ~3.5 Ga. 6th Astrobiology Sci. Conference. League City, TX. See Project
- Ohmoto, H., Bevacqua, D.C., Johnson, I. & Watanabe, Y. (2010). Geochemical cycles of Fe, Mo, U, Cu, Cr, REEs, and S during the period 3.5-3.2 Ga ago. Geochim. Cosmochim. Acta, 74(12S): A774. See Project
- Ohmoto, H., Bevacqua, D.C., Watanabe, Y. & Yamaguchi, K. (In Review). Iron-poor, but uranium- and lithium-rich, Archaean oceans. Nature Geosciences. See Project
- Ohmoto, H., Lasaga, A.C., Watanabe, Y. & Otake, T. (In Preparation). Anomalous isotope fractionations of sulfur. Geochemical. See Project
- Ohmoto, H., Lasaga, A.C., Watanabe, Y. & Yamaguchi, K. (In Preparation). Evidence for the fully-oxygenated oceans and atmosphere during the Archean Eons. Monograph of the Geological Society of America. See Project
- Otake, T., Lasaga, A.C., Watanabe, Y. & Ohmoto, H. (2009). Theoretical investigations of anomalous fractionation of sulfur isotopes during a surface reaction. AGU Fall Meeting, San Francisco, CA. EOS, 90(52): V11A-1932. See Project
- Watanabe, Y. & Ohmoto, H. (2009). Why anomalous S isotope signatures disappeared at 2.4 Ga ago? 19th Goldschmidt Conference, Davos, Switzerland. Geochim. Cosmochim. Acta, 73(13S): A1420. See Project
- Watanabe, Y. & Ohmoto, H. (2010). Connection between depositional environments and multiple sulfur isotope ratios of sulfides and sulfates in Archean sedimentary rocks. 6th Astrobiology Sci. Conference. League City, TX. See Project
- Watanabe, Y., Choney, A. & Ohmoto, H. (In Preparation). Multiple isotope fractionations of sulfur during thermochemical sulfate reduction by solid organic matter. Geochimica et Cosmochimica Acta. See Project
- Watanabe, Y., Hoashi, M. & Ohmoto, H. (2010). Evidence for the presence of cyanobacteria and thermophylic methanogens in a 3.46 Ga sea, Western Australia [Goldschmidt conference]. Geochim. Cosmochim. Acta, 74(12S): A1116. See Project
- Yamaguchi, K.E., Kato, Y., Nakamura, K., Suzuki, K., Watanabe, Y., Nedachi, M. & Ohmoto, H. (2009). REE+Y geochemistry of the 3.46 Ga Marble Bar Chert recovered by the Archea Biosphere Drilling Project. 19th Goldschmidt Conference, Davos, Switzerland. Geochim. Cosmochim. Acta, 73(13S): A1469. See Project
- Yamaguchi, K.E., Kato, Y., Nakamura, K., Suzuki, K., Watanabe, Y., Nedachi, M. & Ohmoto, H. (2009). REE+Y geochemistry of the 3.46 Ga Marble Bar Chert recovered by the Archean Biosphere Drilling Project. Goldschmidt Conference. Davos, Switzerland. See Project See Project
- View all 28 publications
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Phone:
814-865-4074 -
Fax:
814-863-2001 -
Email:
ohmoto@geosc.psu.edu -
Discipline
Geochemistry
CAN 3