NAI
John Valley
University of Wisconsin, Madison
Current Projects
- Developing Methods for Life Detection on Mars and in Mars Analog Environments — 2016 NAI
- Project 3E: Genesis of High-δ18O Archean Chert, Pilbara Craton, Australia — 2015 NAI
- Project 4B: New Standards for Analysis of O and C Isotope Ratios in Ca-Mg-Fe Carbonates — 2015 NAI
- Project 3D: SIMS Analyses of Filamentous Fossil Microbes From the ~3,465 Ma-Old Apex Chert May Reveal Their Physiology — 2015 NAI
- Project 3B: Genesis of High-δ18O Archean Chert, Pilbara Craton, Australia — 2014 NAI
- Project 3E: Sulfur-Cycling Fossil Bacteria From the 1.8 Ga Duck Creek Formation Provide Promising Evidence of Evolution's Null Hypothesis — 2014 NAI
- Project 4B: New SIMS Procedures for in Situ Analysis of Mass-Independent Fractionation of S Isotopes — 2014 NAI
- Project 3A: Searching for Ancient Impact Events Through Detrital Shocked Zircons — 2014 NAI
- Project 3B: Carbon Isotope Analysis of Archean Microfossils — 2013 NAI
- Project 3C: Carbon Isotope Analysis of Proterozoic Microfossils — 2013 NAI
- Project 3D: Microfossil Insights Into Proterozoic Microbial Ecology — 2013 NAI
- Biosignatures in Relevant Microbial Ecosystems — 2013 NAI
- Developing New Biosignatures — 2013 NAI
- Project 3A: Banded Iron Formation Deposition Across the Archean-Proterozoic Boundary — 2013 NAI
- Project 3A: Stable Isotope and Mineralogical Studies of Banded Iron Formations - O Isotopes by SIMS — 2012 NAI
- Biosignatures in Relevant Microbial Ecosystems — 2012 NAI
- Project 3B: In Situ S Isotope Studies in Archean-Proterozoic Sulfides — 2012 NAI
- Project 1D: Establishing Biogenicity and Environmental Setting of Precambrian Kerogen and Microfossils — 2012 NAI
- Project 7C: Improving Accuracy of in Situ Stable Isotope Analysis by SIMS — 2011 NAI
- Project 2D: Establishing Biogenicity and Environmental Setting of Precambrian Kerogen and Microfossils — 2011 NAI
- Project 3A: Stable Isotope and Mineralogical Studies of Banded Iron Formations - O and Si Isotopes by SIMS — 2011 NAI
- Project 3B: In Situ Sulfur Isotope Studies in Archean-Proterozoic Sulfides — 2011 NAI
- Project 3E: In Situ Sulfur Isotope Studies in in Archean-Proterozoic Sulfides — 2010 NAI
- Project 4A: Improving Accuracy of in Situ Stable Isotope Analysis by SIMS — 2010 NAI
- Project 3D: Stable Isotope and Mineralogical Studies of Banded Iron Formations: O & Si Isotopes by SIMS — 2010 NAI
- Project 3B: Do Iron-Rich Carbonates From Banded Iron Formations Record Ancient Seawater? — 2010 NAI
- New Frontiers in Micro-Analysis of Isotopic Compositions of Natural Materials: Development of O, S, Si, and Li Isotopes — 2009 NAI
- New Frontiers in Micro-Analysis of Isotopic Compositions of Natural Materials: Development of Fe Isotopes — 2009 NAI
- Co-Evolution of Microbial Metabolisms in the Neoarchean and Paleoproterozoic — 2009 NAI
- New Frontiers in Micro-Analysis of Isotopic Compositions of Natural Materials: Development of O, Si, and Li Isotopes — 2008 NAI
- New Frontiers in Micro-Analysis of Isotopic Compositions of Natural Materials: Development of Fe Isotopes — 2008 NAI
- View all 31 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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Blank, J. G., Green, S. J., Blake, D., Valley, J. W., Kita, N. T., Treiman, A., & Dobson, P. F. (2009). An alkaline spring system within the Del Puerto Ophiolite (California, USA): A Mars analog site. Planetary and Space Science, 57(5-6), 533–540. doi:10.1016/j.pss.2008.11.018
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Hazen, R. M., Bekker, A., Bish, D. L., Bleeker, W., Downs, R. T., Farquhar, J., … Valley, J. W. (2011). Needs and opportunities in mineral evolution research. American Mineralogist, 96(7), 953–963. doi:10.2138/am.2011.3725
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Heimann, A., Johnson, C. M., Beard, B. L., Valley, J. W., Roden, E. E., Spicuzza, M. J., & Beukes, N. J. (2010). Fe, C, and O isotope compositions of banded iron formation carbonates demonstrate a major role for dissimilatory iron reduction in ~2.5Ga marine environments. Earth and Planetary Science Letters, 294(1-2), 8–18. doi:10.1016/j.epsl.2010.02.015
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Huberty, J. M., Konishi, H., Heck, P. R., Fournelle, J. H., Valley, J. W., & Xu, H. (2012). Silician magnetite from the Dales Gorge Member of the Brockman Iron Formation, Hamersley Group, Western Australia. American Mineralogist, 97(1), 26–37. doi:10.2138/am.2012.3864
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Kita, N. T., Huberty, J. M., Kozdon, R., Beard, B. L., & Valley, J. W. (2010). High-precision SIMS oxygen, sulfur and iron stable isotope analyses of geological materials: accuracy, surface topography and crystal orientation. Surf. Interface Anal., 43(1-2), 427–431. doi:10.1002/sia.3424
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Knight, K. B., Kita, N. T., Mendybaev, R. A., Richter, F. M., Davis, A. M., & Valley, J. W. (2009). Silicon isotopic fractionation of CAI-like vacuum evaporation residues. Geochimica et Cosmochimica Acta, 73(20), 6390–6401. doi:10.1016/j.gca.2009.07.008
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Williford, K. H., Ushikubo, T., Schopf, J. W., Lepot, K., Kitajima, K., & Valley, J. W. (2013). Preservation and detection of microstructural and taxonomic correlations in the carbon isotopic compositions of individual Precambrian microfossils. Geochimica et Cosmochimica Acta, 104, 165–182. doi:10.1016/j.gca.2012.11.005
See Project See Project See Project See Project - Huberty, J.M., Kita, N.T., Heck, P.R., Kozdon, R., Fournelle, J.H., Xu, H. & Valley, J.W. (2010c). In situ δ18O analyses in quartz and magnetite from the Dales Gorge BIF. 5th International Archean Symposium. See Project
- Huberty, J.M., Konishi, H., Fournelle, J.H., Heck, P.R., H., X. & Valley, J.W. (2010). Silician Magnetite from the Dales Gorge Banded Iron Formation. [Goldschmidt Conference]. Geochimica et Cosmochimica Acta, 73(A): A434. See Project
- Kita, N.T., Huberty, J.M. & Valley, J.W. (2010). Improvement of SIMS oxygen isotope analyses on magnetite, 20th V.M. Goldschmidt Conference. Geochimica et Cosmochimica Acta, Suppl, 74(A521). See Project
- Kozdon, R., Kita, N.T., Huberty, J.M., Fournelle, J.H., Williford, K. & Valley, J.W. (2010). In situ sulfur isotope analysis of sphalerite and other sulfides by SIMS: Precision vs. Accuracy. AbSciCon. See Project See Project
- View all 11 publications
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Phone:
608-263-5659 -
Email:
valley@geology.wisc.edu
Past NAI Teams
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University of Wisconsin
CAN 6 -
Pennsylvania State University
CAN 5 -
University of Wisconsin
CAN 4