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    Experimental Geochemistry @ the University of Oregon

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    Experimental Geochemistry @ the University of Oregon

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    Experimental Geochemistry @ the University of Oregon

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    Experimental Geochemistry @ the University of Oregon

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    Manuscripts

  1. Thomas, A., Watkins, J., Beeler, N., French, M., and Reed, M., Rapid fault healing from cementation in the source region of deep slow slip and tremor.
  2. Hoxsie, E., Watkins, J., Gardner, J., and Befus, K., Ash sintering in the presence of a CO2-H2O vapor: Experiments and comparison to natural samples, for Bulletin of Volcanology.
  3. 2025

  4. Watkins, J., Jia, Q., Zhang, S., Devriendt, L., and Sang, C., Dual-clumped model of coral aragonite isotopic composition constrains the conditions of biomineralization. Submitted to G-Cubed.
  5. Lucarelli, J., Purgstaller, B., Parvez, Z., Watkins, J., Eagle, R., Dietzel, M., and Tripati, A., Dual clumped isotope (Δ47, Δ48) values for calcite grown at varying pH and carbonic anhydrase concentrations constrain equilibrium and kinetic isotope effects, G-Cubed, in review.
  6. Chen, S. and Watkins, J. Oxygen and carbon isotopes in marine carbonates: A biogenic climate archive built upon disequilibria, Elements. In press.
  7. 2024

  8. Jia, Q., Zhang, S., Watkins, J., Huang, Y., and Wang, G., Modelled foraminiferal calcification and strontium partioning in benthic foraminifera helps reconstruct calcifying fluid composition, Nature Communications: Earth and Environment. (pdf reprint)
  9. 2023

  10. Aubin, W., Gardner, J., Watkins, J., and Lloyd, M., 2023, Construction of obsidian during explosive-effusive eruptions: Insights from microlite crystals in obsidian pyroclasts, Frontiers in Earth Science. (pdf reprint)
  11. Parvez, Z., Matamoros, I., Rubi, J., Miguel, K., Elliot, B., Flores, R., Lucarelli, J., Ulrich, R., Eagle, R., Watkins, J., Christensen, J., and Tripati, A., 2023, Paired Δ4748 constrains kinetic effects and timescales in peridotite-associated springs, Geochimica et Cosmochimica Acta, v. 358, p. 77-92. (pdf reprint)
  12. Hosseini, B., Myers, M., Watkins, J., and Harris, M., 2023, Are we recording? Putting embayment speedometry to the test using high pressure-temperature decompression experiments, Geochemistry, Geophysics, Geosystems, 18 pages. (pdf reprint)
  13. 2022

  14. Hudak, M., Bindeman, I., Watkins, J., and Lowenstern, J., 2022, Hydrogen isotope fractionation between volcanic glass and water vapor between 175 and 375°C, GCA, v. 337, p. 33-48. (pdf reprint)
  15. Acosta, M., Reed, M. and Watkins, J., 2022, Textures of quartz-molybdenite veins in the Butte, Montana porphyry copper deposit indicate vein strain during deposit formation, Lithos, 19 pages. (pdf reprint)
  16. Watkins, J., and Devriendt, L., 2022, A combined model for kinetic clumped isotope effects in the CaCO3-DIC-H2O system, Geochemistry, Geophysics, Geosystems, v. 23, 34 pages. (pdf reprint)
  17. Watkins, J., Christensen, J., Ryerson, F., and DePaolo, D., 2022, Ca and K isotope fractionation by diffusion in molten silicates: Large concentration gradients are not required to induce large diffusive isotope effects, Isotopic Constraints on Earth System Processes, Geophysical Monograph, 273. (pdf reprint)
  18. Olsen, E. Watkins, J., and Devriendt, L., 2022, Oxygen isotopes of calcite precipitated at high ionic strength and 25°C: CaCO3-DIC fractionation and carbonic anhydrase inhibition. GCA, v. 325, p. 170-186. (pdf reprint)
  19. 2021

  20. Watkins, J., and Antonelli, M., 2021, Beyond equilibrium: Kinetic isotope effects in high-temperature systems, Elements, v. 17, p. 383-388. (pdf reprint)
  21. Devriendt, L., Metzger, E., Olsen, E., Watkins, J., Kaczmarek, K., Nehrke, G., de Nooijer, L., and Reichart, G.-J., 2021, Sodium incorporation into inorganic calcite and implications biogenic carbonates, GCA, v. 314, p. 294-312. (pdf reprint)
  22. Giachetti, T., Trafton, K., Wiejaczka, J., Gardner, J., Watkins, J., Shea, T., and Wright, H., 2021, The products of primary magma fragmentation finally revealed by pumice agglomerates, Geology, v. 29. (pdf reprint)
  23. Christensen, J., Watkins, J., DePaolo, D., Devriendt, L., Conrad, M., Voltolini, M., Brown, S., and Yang, W., 2021, Calcium, carbon, and oxygen isotope fractionation accompanying carbonate precipitation from high pH waters at The Cedars, CA, GCA, v. 301, p. 91-115 (pdf reprint)
  24. 2020

  25. Acosta, M., Watkins, J., Reed, M., Donovan, J., and DePaolo, D., 2020, Ti-in-quartz: Evaluating kinetic effects in high temperature crystal growth experiments, Geochimica et Cosmochimica Acta, v. 149, p. 149-167. (pdf reprint)
  26. 2019

  27. Antonelli, M., Mittal, T., McCarthy, A., Tripoli, B., Watkins, J., and DePaolo, D., 2019, Ca isotopes indicated rapid disequilibrium crystal growth in volcanic and subvolcanic systems, PNAS. (pdf reprint)
  28. Gardner, J., Wadsworth, F., Llewllin, E., Watkins, J.M., and Coumans, J., 2019, Experiments and constraints on the origin of obsidian pyroclasts, Bulletin of Volcanology, 81:22. (pdf reprint)
  29. 2018

  30. Burgener, L., Huntington, K., Sletten, R., Watkins, J.M., Quade, J., and Hallet, B., 2018, Clumped isotope constraints on equilibrium formation and kinetic isotope effects in soil carbonates from freezing soils, Geochimica et Cosmochimica Acta, v. 235, p. 402-430. (pdf reprint)
  31. Myers, M., Wallace, P., Wilson, C., Watkins, J.M. and Liu, Y., 2018, Ascent rates of rhyolitic magma at the onset of three caldera forming eruptions, American Mineralogist, v. 103, p. 952-965. (pdf reprint)
  32. Gardner, J., Wadsworth, F., Llewellin, E., Watkins, J.M. and Coumans, J., 2018, Experimental sintering of ash at conduit conditions and implications for the longevity of tuffisites, Bulletin of Volcanology, v. 80(3), article 23. (pdf reprint)
  33. Bloch, E., Watkins, J.M. and Ganguly, J., 2018, Comment on "Reconciliation of the excess 176Hf conundrum in meteorites: Recent disturbances of the Lu-Hf and Sm-Nd isotope systematics” [Geochimica et Cosmochimica Acta 212 (2017) 303-323], Geochimica et Cosmochimica Acta, v. 230, p. 190-192. (pdf reprint)
  34. 2017

  35. Devriendt, L.S., Watkins, J.M. and McGregor, H.V., 2017, Oxygen isotope fractionations in the CaCO3-DIC-H2O system, Geochimica et Cosmochimica Acta, v. 214, p. 115-142. (pdf reprint)
  36. Saenger, C., Gabitov, R., Farmer, J., Watkins, J.M. and Stone, R., 2017, Linear correlations in bamboo coral δ13C and δ18O sampled by SIMS and micromill: Evaluating paleoceanographic potential and biomineralization mechanisms using δ11B and Δ47 variability, Chemical Geology, v. 454, p. 1-14 . (pdf reprint)
  37. Bloch, E., Watkins, J.., and Ganguly, J., 2017, Diffusion kinetics of lutetium in diopside and the effect of thermal metamorphism on Lu-Hf systematics in meteorites, Geochimica et Cosmochimica Acta, v. 204, p. 32-51. (pdf reprint)
  38. Gardner, J.E., Llewellin, E.W., Watkins, J.M. and Befus, K.S., 2017, Formation of obsidian pyroclasts by sintering of ash particles in the volcanic conduit, Earth and Planetary Science Letters, v. 459, p. 252-263. (pdf reprint)
  39. Watkins, J., Gardner, J.E., and Befus, K.S., 2017, Non-equilibrium degassing, regassing, and vapor fluxing in magma feeder systems, Geology, v. 45, no. 2, p. 183-186. (pdf reprint)
  40. Teng, F., Dauphas, N., and Watkins, J., 2017, Non-traditional stable isotopes: Retrospective and prospective, Reviews in Mineralogy and Geochemistry v. 82. (pdf reprint)
  41. Watkins, J., DePaolo, D., and Watson, E.B., 2017, Kinetic fractionation of non-traditional stable isotopes by diffusion and crystal growth reactions, Reviews in Mineralogy and Geochemistry v. 82. (pdf reprint)
  42. 2016

  43. Seligman, A., Bindeman, I., Watkins, J.., and Ross, A., 2016, Water in volcanic glass: From volcanic degassing to secondary hydration, Geochimica et Cosmochimica Acta, v. 191, p. 216-238. (pdf reprint)
  44. Saenger, C., and Watkins, J., 2016, A refined method for calculating paleotemperatures from linear correlations in bamboo coral carbon and oxygen isotopes, Paleoceanography, v. 31, p. 789-799. (pdf reprint)
  45. Gardner, J., Befus, K., Watkins, J., and Clow, T., 2016, Nucleation rates of spherulites in natural rhyolitic lava, American Mineralogist, v. 101, p. 2367-2376. (pdf reprint)
  46. Aster, A., Wallace, P., Moore, L., Watkins, J., Gazel, E., and Bodnar, R., 2016, Reconstructing CO2 concentrations in basaltic melt inclusions from mafic cinder cones using Raman analysis of vapor bubbles, Journal of Volcanology and Geothermal Research, v. 323, p. 148-162. (pdf reprint)
  47. 2015

  48. Watkins, J., and Hunt, J., 2015, A process-based model for non-equilibrium clumped isotope effects in carbonates, Earth and Planetary Science Letters, v. 432, p. 152-165. (pdf reprint)
  49. Befus, K.S., Watkins, J., Gardner, J., Richard, D., Befus, K.M., Miller, N., and Dingwell, D., 2015, Spherulites as in-situ recorders of thermal history in lava flows, Geology, v. 42, no. 7, p. 647-650. (pdf reprint)
  50. 2014

  51. Watkins, J., Hunt, J., Ryerson, F., and DePaolo, D., 2014, The influence of temperature, pH, and growth rate on the δ18O composition of inorganically precipitated calcite, Earth and Planetary Science Letters, v. 404, p. 332-343. (pdf reprint)
  52. Von Aulock, F., Kennedy, B., Schipper,I., Castro, J., Martin, D., Oze, C., Nichols, A., Watkins, J., Wallace, P., Puskar, L., Bégué, F., Tuffen, H., 2014, Advances in Fourier transform infrared spectroscopy of natural glasses: From sample preparation to data analysis, Lithos, v. 206-207, p. 52-64. (pdf reprint)
  53. Watkins, J., Liang, Y., Richter, F., Ryerson, F., and DePaolo, D., 2014, Diffusion of multi-isotopic species in molten silicates, Geochimica et Cosmochimica Acta, v. 139, p. 313-326 (pdf reprint)
  54. 2013

  55. Watkins, J., Nielsen, L., Ryerson, F., and DePaolo, D., 2013, The influence of kinetics on the oxygen isotope composition of calcium carbonate, Earth and Planetary Science Letters, v. 375, p. 349-360. (pdf reprint)
  56. Gardner, J., Befus, K., Watkins, J., Hesse, M., and Miller, N., 2012, Compositional gradients surrounding spherulites in obsidian and their relationship to spherulite growth and cooling, Bulletin of Volcanology. (pdf reprint)
  57. 2008-2012

  58. Watkins, J., Manga, M., and DePaolo, D., 2012, Bubble geobarometry: A record of pressure changes, degassing, and regassing at Mono Craters, California, Geology. (pdf reprint)
  59. Watkins, J., DePaolo, D., Ryerson, F., and Peterson, B., 2011, Influence of liquid structure on diffusive isotope separation in molten silicates and aqueous solutions, Geochimica et Cosmochimica Acta, v. 75, p. 3103-3118. (pdf reprint)
  60. Watkins, J., 2010, Elemental and isotopic separation by diffusion in geological liquids, Ph.D. Dissertation, University of California Berkeley.
  61. Watkins, J., DePaolo, D., Huber, C., and Ryerson, F., 2009, Liquid composition-dependence of calcium isotope fractionation during diffusion in molten silicates, Geochimica et Cosmochimica Acta, v. 73, p. 7341-7359. (pdf reprint)
  62. Richter, F., Watson, E., Mendybaev, R., Dauphas, N., Georg, B., Watkins, J., and Valley, J., 2009, Isotope fractionation of the major elements of molten basalt by chemical and thermal diffusion, Geochimica et Cosmochimica Acta, v. 73, p. 4250-4263. (pdf reprint)
  63. Huber, C., Watkins, J., and Manga, M., 2008, Steady shape of a miscible bubble rising below an inclined wall at low Reynolds numbers, European Journal of Fluid Mechanics B/Fluids, v. 28, p. 405-410. (pdf reprint)
  64. Watkins, J., Manga, M., Huber, C., and Martin, M., 2008, Diffusion-controlled spherulite growth inferred from H2O concentration profiles in obsidian, Contributions to Mineralogy and Petrology, v. 157, p. 163-172. (pdf reprint)



James M. Watkins
Professor
Department of Earth Sciences
1272 University of Oregon
Eugene, OR 97403
Office: Cascade 205A
Email: watkins4@uoregon.edu