James Farquhar

Summary

Affiliation: University of Maryland
Country: USA

Publications

  1. ncbi request reprint Isotopic evidence for Mesoarchaean anoxia and changing atmospheric sulphur chemistry
    James Farquhar
    Department of Geology and ESSIC, University of Maryland, College Park, Maryland 20742, USA
    Nature 449:706-9. 2007
  2. doi request reprint Geological constraints on the origin of oxygenic photosynthesis
    James Farquhar
    Department of Geology and ESSIC, University of Maryland, College Park, MD 20742, USA
    Photosynth Res 107:11-36. 2011
  3. ncbi request reprint Late Archean biospheric oxygenation and atmospheric evolution
    Alan J Kaufman
    Departments of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742 4211, USA
    Science 317:1900-3. 2007
  4. ncbi request reprint Active microbial sulfur disproportionation in the Mesoproterozoic
    David T Johnston
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Science 310:1477-9. 2005
  5. pmc Sulfur isotope variability of oceanic DMSP generation and its contributions to marine biogenic sulfur emissions
    Harry Oduro
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Proc Natl Acad Sci U S A 109:9012-6. 2012
  6. pmc Pathways for Neoarchean pyrite formation constrained by mass-independent sulfur isotopes
    James Farquhar
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742
    Proc Natl Acad Sci U S A 110:17638-43. 2013
  7. pmc Evidence of magnetic isotope effects during thermochemical sulfate reduction
    Harry Oduro
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Proc Natl Acad Sci U S A 108:17635-8. 2011
  8. doi request reprint Large sulfur isotope fractionations associated with Neoarchean microbial sulfate reduction
    Iadviga Zhelezinskaia
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Science 346:742-4. 2014
  9. pmc Early inner solar system origin for anomalous sulfur isotopes in differentiated protoplanets
    Michael A Antonelli
    Department of Geology, University of Maryland, College Park, MD 20742
    Proc Natl Acad Sci U S A 111:17749-54. 2014
  10. ncbi request reprint Early Archaean microorganisms preferred elemental sulfur, not sulfate
    Pascal Philippot
    Equipe Géobiosphère actuelle et Primitive, Institut de Physique du Globe de Paris, CNRS and Université Denis Diderot, 4 place Jussieu, 75005 Paris Cedex, France
    Science 317:1534-7. 2007

Collaborators

Detail Information

Publications10

  1. ncbi request reprint Isotopic evidence for Mesoarchaean anoxia and changing atmospheric sulphur chemistry
    James Farquhar
    Department of Geology and ESSIC, University of Maryland, College Park, Maryland 20742, USA
    Nature 449:706-9. 2007
    ..45-Gyr-ago atmospheric pathways for non-mass-dependent chemistry and in the ultraviolet transparency of an evolving early atmosphere...
  2. doi request reprint Geological constraints on the origin of oxygenic photosynthesis
    James Farquhar
    Department of Geology and ESSIC, University of Maryland, College Park, MD 20742, USA
    Photosynth Res 107:11-36. 2011
    ..The geological evidence for early oxygen and hypotheses for the controls on oxygen level are the basis for the interpretation of photosynthetic oxygen production as examined in this review...
  3. ncbi request reprint Late Archean biospheric oxygenation and atmospheric evolution
    Alan J Kaufman
    Departments of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742 4211, USA
    Science 317:1900-3. 2007
    ..The data suggest that oxygenation of the surface ocean preceded pervasive and persistent atmospheric oxygenation by 50 million years or more...
  4. ncbi request reprint Active microbial sulfur disproportionation in the Mesoproterozoic
    David T Johnston
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Science 310:1477-9. 2005
    ..These measurements imply that sulfur compound disproportionation was an active part of the sulfur cycle by 1300 Ma and that progressive Earth surface oxygenation may have characterized the Mesoproterozoic...
  5. pmc Sulfur isotope variability of oceanic DMSP generation and its contributions to marine biogenic sulfur emissions
    Harry Oduro
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Proc Natl Acad Sci U S A 109:9012-6. 2012
    ....
  6. pmc Pathways for Neoarchean pyrite formation constrained by mass-independent sulfur isotopes
    James Farquhar
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742
    Proc Natl Acad Sci U S A 110:17638-43. 2013
    ..We also suggest that the existence of a significant nonsulfate pool of reactive sulfur has masked isotopic evidence for the widespread activity of sulfate reducers in the rock record. ..
  7. pmc Evidence of magnetic isotope effects during thermochemical sulfate reduction
    Harry Oduro
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Proc Natl Acad Sci U S A 108:17635-8. 2011
    ..These results support an origin other than thermochemical sulfate reduction for the mass-independent signals observed for early Earth samples...
  8. doi request reprint Large sulfur isotope fractionations associated with Neoarchean microbial sulfate reduction
    Iadviga Zhelezinskaia
    Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
    Science 346:742-4. 2014
    ..In contrast, a negative Δ(33)S excursion in lower Batatal strata indicates a response time of ~40,000 to 150,000 years, suggesting Neoarchean sulfate concentrations between ~1 and 10 μM. ..
  9. pmc Early inner solar system origin for anomalous sulfur isotopes in differentiated protoplanets
    Michael A Antonelli
    Department of Geology, University of Maryland, College Park, MD 20742
    Proc Natl Acad Sci U S A 111:17749-54. 2014
    ..A tentative correlation between S isotopes and Hf-W core segregation ages suggests that the two systems may be influenced by common factors, such as nebular location and volatile content. ..
  10. ncbi request reprint Early Archaean microorganisms preferred elemental sulfur, not sulfate
    Pascal Philippot
    Equipe Géobiosphère actuelle et Primitive, Institut de Physique du Globe de Paris, CNRS and Université Denis Diderot, 4 place Jussieu, 75005 Paris Cedex, France
    Science 317:1534-7. 2007
    ..Instead, we interpret the combined negative delta34S and positive Delta33S signature of these microscopic sulfides as evidence for the early existence of organisms that disproportionate elemental sulfur...