Stable Isotope Laboratory

Locations and Directions: 0233, 0230, and 0224 Chemistry Building 

 (301) 405 8611 (mass spectrometry laboratory)

(301) 405-1116 (chemistry laboratory)

 

James Farquhar

(Associate Professor)

 

Publications (students in bold)

 

James Farquhar and Thomas Chacko (1991) Isotopic evidence for CO2-bearing magmas in granulite formation. Nature, 354, 60-63.

 

James Farquhar, Thomas Chacko and B. Ronald Frost (1993) Strategies for high-temperature oxygen isotope thermometry: A worked example from the Laramie Anorthosite Complex, Wyoming, USA. Earth and Planetary Science Letters, 117, 405-427.

 

James Farquhar and Thomas Chacko (1994) Exsolution enhanced oxygen isotope exchange: Implications for oxygen isotope closure temperatures in minerals. Geology, 22, 751-754.

 

Thomas Chacko, Malcomb Lamb and James Farquhar (1996) Ultra-high temperature metamorphism in the Kerala Khondalite Belt, in M. Santosh and M. Yoshida (eds.) The Archean and Proterozoic terrains in southern India within East Gondwana. Gondwana Research Group Memoir, 3, 157-165.

 

James Farquhar, Thomas Chacko and David J. Ellis (1996) Preservation of oxygen isotopic compositions in granulites from Northwestern Canada and Enderby Land, Antarctica: Implications for high-temperature isotopic thermometry. Contributions to Mineralogy and Petrology, 125, 213-224.

 

Douglas Rumble III, James Farquhar, Edward D. Young and C. Paul Christiensen (1997) In situ oxygen isotope analysis with an excimer laser using F2 and BrF5 Reagents and O2 gas analyte. Geochimica et Cosmochimica Acta, 61, 4229-4234.

 

James Farquhar, Mark H. Thiemens and Teresa Jackson, (1998) Atmosphere-surface interactions on Mars: D17O measurements of carbonate from ALH 84001. Science, 280, 1580-1582.

 

James Farquhar and Douglas Rumble III (1998) Comparison of laser fluorination of olivine with KrF Excimer and CO2 lasers. Geochimica et Cosmochimica Acta, 62, 3141-3149.

 

James Farquhar, Erik Hauri and Jianhua Wang (1999) New insights into carbon fluid chemistry and graphite precipitation: SIMS analysis of granulite facies graphite from Ponmudi, South India. Earth and Planetary Science Letters, 171, 607-621.

 

James Farquhar, Joel Savarino, Terri L. Jackson and Mark H. Thiemens (2000) Evidence of atmospheric sulphur in the Martian regolith from sulphur isotopes in meteorites. Nature, 404, 50-52.

 

James Farquhar, Teresa L. Jackson and Mark H. Thiemens (2000) A bulk 33S enrichment in Ureilite meteorites: Evidence for a nebular sulfur component. Geochimica et Cosmochimica Acta, 64, 1819-1825.

 

James Farquhar and Mark H. Thiemens (2000) The oxygen cycle of the Martian atmosphere-regolith system: D17O of secondary phases in Nakhla and Lafayette. Journal of Geophysical Research, 105, 11,991-11,997.

 

Huiming Bao, Mark Thiemens, James Farquhar, Douglas A. Campbel, Klaus Heine and David B. Loope (2000) Oxygen-17 anomaly in massive sulfate mineral deposits on Earth. Nature, 406, 176-178.

 

James Farquhar, Huiming Bao and Mark Thiemens (2000) Atmospheric influence of the Earth’s earliest sulfur cycle. Science, 289, 756-758.

 

James Farquhar, Huiming Bao, Mark H. Thiemens, Guixing Hu and Douglas Rumble (2001) Questions regarding Precambrian sulfur isotope fractionation - Response. Science, 292(5524), U6-U7.

 

Mark H. Thiemens, Joel Savarino, Huiming Bao and James Farquhar, 2001 Mass-independent isotopic compositions in terrestrial and extraterrestrial solids, and their applications. Accounts of Chemical Research, 34 (8): 645-652.

 

James Farquhar, Joel Savarino, Sabine Airieau and Mark H. Thiemens, 2001 Observation of wavelength-sensitive mass-independent sulfur isotope effects during SO2 photolysis: Applications to the early atmosphere. Journal of Geophysical Research-Planets, 12, 32829-32839.

 

James Farquhar, Boswell A., Wing, Kevin D. McKeegan, Jeffrey W. Harris, Pierre Cartigny and Mark H. Thiemens (2002) Mass-independent sulfur of inclusions in diamond and sulfur recycling on early Earth. Science, 298(5602), 2369-2372.

 

Elisabeth Widom and James Farquhar (2003) Oxygen isotope signature in olivines from Sao Miguel, Azores: Implications for crustal and mantle processes. Chemical Geology, 193, 237-255.

 

Gretchen K. Benedix, Laurie A. Leshin, James Farquhar, Teresa Jackson and Mark H. Thiemens (2003) Carbonates in cm chondrites: constraints on alteration conditions from oxygen isotopic compositions and petrographic observations. Geochimica et Cosmochimica Acta, 67(8), 1577-1588.

 

David R.M. Pattison, Thomas Chacko, James Farquhar and Christopher R.M. McFarlane (2003) Temperature of granulite-facies metamorphism based on experimental phase equilibria combined with garnet-orthopyroxene thermobarometry corrected for retrograde exchange. Journal of Petrology, 44(5), 867-900.

 

James Farquhar and Boswell A. Wing (2003) Multiple Sulfur Isotope analyses: Applications in geochemistry and cosmochemistry. Earth and Planetary Science Letters, 213(1-2), 1-13.

 

James Farquhar, David T. Johnston, Boswell A. Wing, Kirsten S. Habicht, Donald E Canfield, Sabine Airieau and Mark H. Thiemens (2003) Multiple sulfur isotopic interpretations of biosynthetic pathways: Implications for biological signatures in the sulfur isotope record. Geobiology, 1, 27-36.

 

Sabine Airieau, James Farquhar, Mark H. Thiemens, Laurie A. Leshin, Huiming Bao, Edward D. Young, (2005), Planetesimal sulfate and aqueous alteration in CM and CI carbonaceous chondrites, Geochimica et Cosmochimica Acta, 69, Pages 4167-4172.

          

James Farquhar and Boswell A. Wing (2005), The terrestrial record of stable sulphur isotopes: a review of the implications for evolution of Earth’s sulphur cycle, in McDonald, I., Boyce,A. J., Butler, I. B.,Herrington, R. J. & Polya,D.A. (eds), Mineral Deposits and Earth Evolution. Geological Society, London, Special Publications, 248, 167–177.

 

Johnston, D. T., Farquhar, J., Wing, B. A., Kaufman, A., Canfield, D. E., and Habicht, K. S., 2005a. Multiple sulfur isotope fractionations in biological systems: A case study with sulfate reducers and sulfur disproportionators. American Journal of Science 305, 645-660.

 

Johnston, D. T., Wing, B. A., Farquhar, J., Kaufman, A. J., Strauss, H., Lyons, T. W., Kah, L. C., and Canfield, D. E., 2005b. Active microbial sulfur disproportionation in the Mesoproterozoic. Science 310, 1477-1479.

 

Ono, S., Wing, B., Johnston, D., Farquhar, J., and Rumble, D., 2006a. Mass-dependent fractionation of quadruple stable sulfur isotope system as a new tracer of sulfur biogeochemical cycles. Geochimica Et Cosmochimica Acta 70, 2238-2252.

 

Ono, S., Wing, B., Rumble, D., and Farquhar, J., 2006b. High precision analysis of all four stable isotopes of sulfur (S-32, S-33, S-34 and S-36) at nanomole levels using a laser fluorination isotope-ratio-monitoring gas chromatography-mass spectrometry. Chemical Geology 225, 30-39.

 

Johnston, D. T., Poulton, S. W., Fralick, P. W., Wing, B. A., Canfield, D. E., and Farquhar, J., 2006. Evolution of the oceanic sulfur cycle at the end of the Paleoproterozoic. Geochimica Et Cosmochimica Acta 70, 5723-5739.

 

Jamieson JW, Wing, BA, Hannington, MD, Farquhar, J. (2006) Evaluating isotopic equilibrium among sulfide mineral pairs in Archean ore deposits:  Case study from the Kidd Creek VMS deposit Ontario, Canada, Economic Geology, 101, 1055-1061.

 

Tyra M.A., J. Farquhar, B.A. Wing, G.K. Benedix, A.J.T. Jull, T. Jackson, M.H. Thiemens, (2007) Terrestrial alteration of carbonate in a suite of Antarctic CM chondrites: Evidence from oxygen and carbon isotopes Geochimica et Cosmochimica Acta 71, 782-795.

 

Bindeman I.N., Eiler, J.M., Wing, B.A., Farquhar, J., and Sarna-Wojcicki, A.M.(2007) 17O excess and triple sulfur isotopic ratios in sulfate aerosols from large and small volcanic eruptions, Geochimica et Cosmochimica Acta.71,

 

Johnston, D.T., Farquhar, J., and Canfield, D.E. (2007) Sulfur isotope insights into microbial sulfate reduction: when microbes meet models, Geochimica et Cosmochimica Acta 71 (2007) 3929–3947.

 

Phillipot, P,Van Zuilen, M., Lepot, K, Thomazo, C., Farquhar, J., and Van Kranendonk, M. (2007) Early Archean microorganisms preferred elemental sulfur, not sulfate Science, 317: 1534-1537 [DOI: 10.1126/science.1145861].

 

Farquhar, J., Kim, S.T., Masterson, A.L. (2007) Implications from sulfur isotopes of the Nakhla meteorite for the origin of sulfate on Mars, Earth and Planetary Science Letters doi:10.1016/j.epsl.2007.08.006.

 

Farquhar, J., Johnston, D.T., Wing., B.A. (2007) Influence of network structure on sulfur isotope phase space of dissimilatory sulfate reduction: Implications of conservation of mass effects on mass-dependent isotope fractionations Geochimica et Cosmochimica Acta doi: 10.1016/j.gca.2007.08.028.

 

Kaufman AJ, Johnston DT, Farquhar J, Masterson AL, Lyons TW, Bates S, Anbar A, Arnold GL, Garvin J, Buick R, (2007) Global biospheric oxygenation and atmospheric evolution at the close of the Archean Eon, Science 317: 1900-1903 [DOI: 10.1126/science.1138700].

 

Farquhar J, Peters M, Johnston DT, Strauss H, Masterson A, Wiechert U, and Kaufman AJ (2007) Isotopic evidence for Mesoarchean anoxia and changing atmospheric sulfur chemistry, Nature Oct 11, 2007.

 

Farquhar, J. Johnston, DT. (2008) The oxygen cycle of the terrestrial planets: Insights into the processing and history of oxygen in surface environments. Reviews in Mineralogy and Geochemistry.

 

Criss, B. and Farquhar J. (2008) Abundance, Notation, and Fractionation Of Light Stable Isotopes Reviews in Mineralogy and Geochemistry.

 

Domagal-Goldman, S.D, Kasting, JF,  Johnston, DT, Farquhar J. (2008) Using multiple sulfur isotopes to constrain Archean atmosphere. Earth and Planetary Science Letters.

 

Johnston DT, Farquhar J, Habicht, KS, Canfield DE, (2008) Sulfur isotopes and the search for life:  strategies for identifying sulfur metabolisms in the rock record and beyond Geobiology.

 

Farquhar J, Canfield DE, Masterson AJ, Johnston DT, Sulfur and oxygen isotope study of sulfate reduction in experiments with natural populations from Fællestrand, Denmark Geochimica et Cosmochimica Acta (in press).