Address: 674 Webster Ave.

Palo Alto, CA 94301

U.S. Geological Survey M.S. 434

345 Middlefield Road

Menlo Park. CA 94025


Ph.D. in chemistry, University of Chicago, 1963.

M.S. in chemistry, Carnegie-Mellon University, 1959.

B.S. (Honors) in chemistry, Loyola University (Chicago), 1956.


Jan 61 - Jun 62 Instructor in chemistry and physical science at Chicago Junior Colleges.

Mar 63 - Jun 63 Research Associate at Enrico Fermi Institute of Nuclear Studies of the University of Chicago.

Jul 63 - Oct 65 Research Fellow in geochemistry at California Institute of Technology

Oct 65 - Jan 88 Research Chemist, Branch of Isotope Geology, U.S. Geological Survey, Menlo Park, CA.

Jul 67 - Aug 69 Branch Representative, Branch of Isotope Geology, Menlo Park, CA.

Jul 68 Organizing Chairman (Geochemistry) of Gordon conference on Chemistry and Physics of Isotopes.

Jul 69 - Jan 72 Co-investigator, Lunar Analysis Program.

Sep 72 - Jan 73 Exchange Fellow (USA-USSR), Vernadskiiy Institute of Geochemistry and Analytical Chemistry (Moscow).

Jan 75 - Jan 88 Adjunct Professor of Geochemistry, Stanford University.

Sep 76 and 83 Expert Consultant, IAEA Advisory Group on Standards.

Apr 77 - Jun 77 Consulting Professor of Geochemistry, San Jose State University.

Mar 78 - May 78 Visiting Fellow, Research School of Earth Sciences, Australian National University.

Dec 80 - Apr 81 Visiting Scientist, University of Paris.

Jun 81 - Dec 83 Member, NSF Review Panel

Aug 83 Convener, Water-Rock Interaction IV, Misasa, Japan.

Jan 84 - Jul 84 Visiting Professor, Louis-Pasteur University, Strasbourg.

Oct 84 - Nov 84 Visiting Professor, University of Cape Town.

Jul 84 - Sept 89 Associate Editor, Geochimica et Cosmochimica Acta.

Sep 86 Expert Consultant, Lawrence Livermore Laboratory.

Nov 86 Contributing Editor, MSA Short Course on "Stable Isotope Geochemistry of High Temperature Processes."

Jan 87 - present Rédacteur Associé, Bulletin des Sciences Géologiques.

Jan 88 - present Professor of Geochemistry, University of Michigan.

Aug 88 Convenor, International Congress of Geochemistry and Cosmochemistry, Paris

Nov 88 - Dec 91 Councilor, Geochemical Society

May 89 - present Councilor, International Association of Geochemistry and Cosmochemistry

Feb 90 Contributing Editor, Geochemical Society Spec. Publ.No.3

Jan 90 - Dec 94 Associate Editor, GEOLOGY

Jan 91 - present Member, Publications Committee (ICGC)

Jan 94 - Aug 94 Professeur Associé, Université de Lausanne

Jan 97 - present Associate Editor, Terra Nova

Jun 98 - present Professor Emeritus, University of Michigan

Aug 98 - Jul 99 Guest Professor, Eberhard-Karls University (Tübingen)

Aug 99 - present Visiting Scientist, U.S. Geological Survey (Menlo Park, CA)


Award for "Excellence in Research" from the College of Literature, Arts and Sciences, University of Michigan, 1996. Honorary title of Geochemistry Fellow awarded jointly by The European Association for Geochemistry and the Geochemical Society, 1998. Recipient of 1998 "Forschungspreis" from the Alexander von Humboldt Foundation. Recipient of the Goldschmidt Medal, 2004.


Stable isotope thermometry, structure of water and concentrated brines, genesis of granite and basalt, mantle processes, crustal xenoliths, sources of fluids in ore-forming processes, water-rock interactions, experimental studies of stable isotope effects, geochemical methods of earthquake prediction, paleoclimatology, theoretical aspects of stable isotope fractionation, biomineralization, mineral reaction mechanisms, clay diagenesis, oxygen isotope variations in biogenic phosphate, and the relation between chemical bonding and isotopic properties of minerals.


Semi-fluent in French. Fair speaking and reading ability in German and Russian.


A.C.S., Sigma Xi, G.S.A. (Fellow), A.G.U. (Fellow), A.A.A.S., Geochemical Society, International. Association of. Geochemistry and Cosmochemistry.


1. O'Neil, J.R. and Clayton, R.N. (1964) Oxygen isotope geothermometry. In Isotopic and Cosmic Chemistry (eds.Craig, H. Miller, S.L. and Wasserburg, G.J.), North-Holland, Amsterdam, 157-168.

2. O'Neil, J.R. and Epstein, S. (1966a) A method for oxygen isotope analysis of milligram quantities of water and some of its applications. J.Geophs. Res., 71, 4955-4961.

3. O'Neil, J.R. and Epstein, S. (1966b) Oxygen isotope fractionation in the system dolomite-calcite-carbon dioxide. Science, 152, 198-201.

4. Pidgeon, R.T., O'Neil, J.R., and Silver, L.T. (1966) Uranium and lead isotopic stability in a metamict zircon under experimental hydrothermal conditions. Science, 154, 1538-1540.

5. O'Neil, J.R. and Taylor, H.P. (1967) The oxygen isotope and cation exchange chemistry of feldspars. Am. Mineral., 52, 1414-1437.

6. O'Neil, J.R. (1968) Hydrogen and oxygen isotope fractionation between ice and water. Jour. Phys. Chem., 72, 3683.

7. Rye, R.O. and O'Neil, J.R. (1968) The O18 content of water in primary fluid inclusions from Providencia, north-central Mexico. Econ. Geol., 63, 232-238.

8. Barnes, I. and O'Neil, J.R. (1969) The relationship between fluids in some fresh alpine-type ultramafics and possible modern serpentinization, western United States. Geol. Soc. America Bull., 80, 1947-1960.

9. O'Neil, J.R. and Adami, L.H. (1969) The oxygen isotope partition function ratio of H2O and the structure of liquid water. Jour. Phys. Chem., 73, 1553-1558.

10. O'Neil, J.R., Clayton, R.N. and Mayeda, T.K. (1969) Oxygen isotope fractionation in divalent metal carbonates. Jour. Chem. Phys., 51, 5547-5558.

11. O'Neil, J.R. and Taylor, H.P., Jr. (1969) Oxygen isotope fractionation between muscovite and water. Jour. Geophys. Res., 74, 6012-6021.

12. Friedman, I. O'Neil, J.R, Adami, L.H., Gleason, J.D. and Hardcastle, K. (1970) Water, hydrogen, deuterium, carbon, carbon-13, and oxygen-18 content of selected lunar material. Science, 167, 538-540.

13. O'Neil, J.R. and Adami, L.H. (1970) Oxygen isotope analyses of of selected Apollo 11 materials. Proc. Apollo 11 Sci. Conf., Geochim. Cosmochim. Acta, Supp. I, 2, 1425-1427.

14. O'Neil, J.R., Hedge, C.E. and Jackson, E.D. (1970) Isotopic investigations of xenoliths and host basalts from the Honolulu volcanic series. Earth Planet. Sci. Lett., 8, 253-257.

15. Barnes, I. and O'Neil, J.R. (1971) Calcium-magnesium carbonate solid solutions from Holocene conglomerate cements and travertines in the Coastal Range of California. Geochim. Cosmochim. Acta., 35, 698-718.

16. Friedman, I., O'Neil, J.R., Gleason, J.D. and Hardcastle, K. (1971) The carbon and hydrogen content and isotopic composition of some Apollo 12 materials. Proc. Second Lunar Sci. Conf., 2, 1407-1415. Massachusetts Inst. Tech. Press.

17. Garlick, G.D., Naeser, C.W., and O'Neil, J.R. (1971) A Cuban tektite. Geochim. Cosmochim. Acta., 35, 731-734.

18. O'Neil, J.R. and Barnes, I. (1971) C13 and O18 compositions in some fresh-water carbonates associated with ultramafic rocks and serpentinites, western United States. Geochim. Cosmochim. Acta, 35, 687-697.

19. Barnes, I., Rapp, J.B., O'Neil, J.R., Sheppard, R.A. and Gude, A.J. (1972) Metamorphic assemblages and the directions of flow of metamorphic fluids. Contr. Mineral. Petrol., 35, 263-276.

20. Clayton, R.N., O'Neil, J.R., and Mayeda, T.K. (1972) Oxygen isotope fractionation between quartz and water. Jour. Geophys. Res., 77, 3057-3067.

21. Herman, Y., O'Neil, J.R., and Drake, C.L. (1972) Micropaleontology and paleotemperatures of postglacial SW Greenland fjord cores. In Climatic Changes in Arctic Areas During the Last 10,000 Years (Vasari, Y., Hyvarinen, H. and Hicks, S., eds.) University of Oulu, 357-408.

22. Barnes, I. O'Neil, J.R., Rapp, J.B. and White, D.E. (1973) Silica-carbonate alteration of serpentine: Wall rock alteration in mercury deposits of the California Coastal Ranges. Econ. Geol., 68, 388-398.

23. O'Neil, J.R. and Hay, R.L. (1973) O18/O16 ratios of cherts associated with the alkaline lakes of East Africa. Earth Planet. Sci. Lett., 19, 257-266.

24. O'Neil, J.R., Silberman, M.L., Fabbi, B.P., and Chesterman, C.L. (1973) Stable isotope and chemical relations during mineralization in the Bodie mining district, Mono County, California. Econ. Geol., 68, 765-784.

25. Stuckless, J.S. and O'Neil, J.R. (1973) Petrogenesis of the Superstition-Superior volcanic area as inferred from strontium- and oxygen-isotope studies. Geol. Soc. America. Bull., 84, 1987-1998.

26. White, D.E., Barnes, I., and O'Neil, J.R. (1973) Thermal and mineral waters of non-meteoric origin, California Coast Ranges. Geol. Soc. America Bull., 84, 547-560.

27. O'Neil, J.R. and Silberman, M.L. (1974) Stable isotope relations in epithermal Au-Ag deposits. Econ. Geol., 69, 902-909.

28. Stiles, D.N., Hay, R.L., and O'Neil, J.R. (1974) The MNK chert factory site, Olduvai Gorge, Tanzania. World Archaeology, 5, 285-308.

29. Herman, Y. and O'Neil, J.R. (1975) Arctic palaeosalinities during late Cenozoic time. Nature, 258, 591-595.

30. O'Neil, J.R., Adami, L.H., and Epstein, S. (1975) Revised value for the O18 fractionation between CO2 and H2O at 25°C . U.S. Geol. Survey. Jour. Res., 3, 623-624.

31. O'Neil, J.R. and Ghent, E.D. (1975) Stable isotope study of coexisting metamorphic minerals from the Esplanade Range, British Columbia. Geol. Soc. America Bull., 86, 1708-1712.

32. Barker, F., Hedge, C.E., Millard, H.T., Jr. and O'Neil, J.R. (1976) Pikes Peak batholith: geochemistry of some minor elements and isotopes. Colorado School Mines Prof. Contr. No. 8, 44-55.

33. Barnes, I. and O'Neil, J.R. (1976) Metamorphic reactions in flysch rocks. In Internat. Symp. on Water-Rock Interaction (Cadek, J. and Paces, T., eds.), 309-316.

34. Frey, M., Hunziker, J.C., O'Neil, J.R., and Schwander, H.W. (1976) Equilibrium-disequilibrium relations in the Monte Rosa granite, western Alps: petrological, Rb-Sr and stable isotope data. Contr. Mineral. Petrol., 55, 147-179.

35. O'Neil, J.R. and Kharaka, Y.K. (1976) Hydrogen and oxygen isotope exchange reactions between clay minerals and water. Geochim. Cosmochim. Acta, 40, 241-246.

36. Friedman, I. and O'Neil, J.R. (1977) Compilation of stable isotope fractionation factors of geochemical interest. In Data of Geochemistry (M. Fleischer, ed.) U.S. Geol. Survey. Prof. Paper 440KK, 6th Edition.

37. Cerling, T.E., Hay, R.L. and O'Neil, J.R. (1977) Isotopic evidence for dramatic climatic changes in East Africa during the Pleistocene. Nature, 267, 137-138.

38. O'Neil, J.R., Shaw, S.E., and Flood, R.H. (1977) Oxygen and hydrogen isotope compositions as indicators of granite genesis in the New England batholith, Australia. Contr. Mineral. Petrol., 62, 313-328.

39. Taylor, B.E. and O'Neil, J.R. (1977) Stable isotope studies of metasomatic Ca-Fe-Al-Si skarns and associated metamorphic and igneous rocks, Osgood Mountains, Nevada. Contrib. Mineral. Petrol., 63, 1-49.

40. O'Neil, J.R. (1977) Stable isotopes in mineralogy. Phys. Chem. Minerals, 2, 105-123.

41. O'Neil, J.R. and Chappell, B.W. (1977) Oxygen and hydrogen isotope relations in the Berridale Batholith. Jour. Geol. Soc. London, 133, 559-571.

42. Barnes, I., O'Neil, J.R., and Trescases, J.J. (1978) Present day serpentinization in New Caledoniia, Oman, and Yugoslavia. Geochim. Cosmochim. Acta, 42, 144-145.

43. Luce, R.W., O'Neil, J.R. and Rye, R.O (1978) Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia. U.S.G.S. Open File Report 78-388.

44. Desmons, J. and O'Neil, J.R. (1978) Oxygen and hydrogen isotope compositions of eclogites and associated rocks from the Eastern Sesia Zone (Western Alps, Italy). Contrib. Mineral. Petrol., 67, 79-85.

45. Cerling, T.E., Hay, R.L. and O'Neil, J.R. (1978) Isotopic, geochemical and faunal evidence for Pleistocene climatic change in East Africa. In Short Papers of the Fourth International Conference, Geochronology, Cosmochronology, Isotope Geology. U.S.G.S. Open File Report 78-701, 63-65.

46. Friedman, I. and O'Neil, J.R. (1978) Hydrogen, In Handbook of Geochemistry, I- B-F, I.L. (Wedepohl, K.H., ed.), Springer-Verlag.

47. Kyser, T.K. and O'Neil, J.R. (1978) Oxygen isotope relations among oceanic tholeiites, alkali basalts, and ultramafic nodules. In Short Papers of the Fourth International Conference, Geochronology, Cosmochronology, Isotope Geology. U.S.G.S. Open File Report 78-701, 237-240.

48. Boettcher, A.L., O'Neil, J.R. Windom, K.E., Stewart, D.C., and Wilshire, H.G. (1979) Metasomatism of the upper mantle and the genesis of kimberlites and alkali basalts. In Proceedings of the Second International Kimberlite Conference. (Boyd, F.R. and Meyer, H.O.A., Eds.) 2, 173-182.

49. O'Neil, J.R. and Bailey, G.B. (1979) Stable isotope investigation of gold-bearing jasperoid in the central Drum Mountains, Utah. Econ. Geol., 74, 852-859.

50. Harmon, R.S., Schwarcz, H.P. and O'Neil, J.R. (1979) D/H ratios in speleothem fluid inclusions: a guide to variations in the isotopic compositions of meteoric precipitation? Earth Planet. Sci. Lett., 42, 254-266.

51. Luce, R.W., O'Neil, J.R. and Rye, R.O (1978) Mahd adh Dhahab: Precambrian epithermal gold deposit , Kingdom of Saudi Arabia, Saudi Arabian Project Report 256, 33p.

52. O'Neil, J.R. (1979) Stable isotope geochemistry of rocks and minerals. In Lectures in Isotope Geology (Jager, E. and Hunziker, J.C., eds.) Springer-Verlag, Heidelberg, 235-263.

53. Sawkins, F.J., O'Neil, J.R., and Thompson, J.M. (1979) Fluid inclusion and geochemical studies of vein gold deposits, Baguio District, Phillipines, Econ. Geol., 74, 1420-1434.

54. Hein, J.R., O'Neil, J.R., and Jones, M.G. (1979) Origin of authigenic carbonates in sediment from the deep Bering sea. Sedimentology, 26, 681-706.

55. Hong, K., Trudell, J.R., O'Neil, J.R. and Cohen, E.N. (1979) Metabolism of nitrous oxide by human and rat intestinal contents, Anesthesiology, 52, 16-19.

56. O'Neil, J.R. and Hanks, T.C. (1980) Geochemical evidence for rock-water interaction along the San Andreas and Garlock faults of California. Jour. Geophys. Res., 85, 6286-6292.

57. Boettcher, A.L., and O'Neil, J.R. (1980) Stable isotope, chemical, and petrographic studies of high-pressure amphiboles and micas: evidence for metasomatism in the mantle source regions of alkali basalts and kimberlites. Am. Jour. Sci., 280-A, 594-621.

58. Masi, U. and O'Neil, J.R. (1980) Stable isotope variations in the Quaternary epithermal calcite-fluorite deposit at Monte delle Fate near Cerveteri (Latium, Central Italy). Mineral. Dep., 15, 41-44.

59. Masi, U. Ferrini, V., O'Neil, J.R., and Batchelder, J.N. (1980) Stable isotope and fluid inclusion studies of carbonate deposits from the Tolfa Mountains mining district (Latium, Central Italy). Mineral. Dep., 15, 351-359.

60. Valley, J.W. and O'Neil, J.R. (1981) 13C/12C exchange between calcite and graphite: a possible thermometer in Grenville marbles. Geochim. Cosmochim. Acta, 45, 411-419.

61. Masi, U., O'Neil, J.R., and Kistler, R.W. (1981) Stable isotope systematics of Mesozoic granitoid rocks from central California. Contrib. Mineral. Petrol., 76, 116-126.

62. O'Neil, J.R. and King, Chi-Yu (1981) Variations in stable-isotope ratios of ground waters in seismically active regions of California. Geophys. Res. Lett., 8, 429-432.

63. Kyser, T.K., O'Neil, J.R., and Carmichael, I.S.E. (1981) Oxygen isotope thermometry of basic lavas and mantle nodules. Contrib. Mineral. Petrol., 77, 11-23.

64. O'Neil, J.R. and Vallier, T.L. (1981) Stable isotope compositions and the origin of secondary minerals in altered volcanic rocks from southern Hess Rise, Deep Sea Drilling Project Site 465, DSDP. In Initial Repts. DSDP, LXII, 971-974.

65. Kistler, R.W., Ghent, E.D., and O'Neil, J.R. (1981) Petrogenesis of garnet two-mica granites in the Ruby Mountains, Nevada. Jour. Geophys. Res., 86, 10591-10606.

66. O'Neil, J.R. (1982) Introduction of Robert N. Clayton for the V.M. Goldschmidt Medal 1981. Geochim. Cosmochim. Acta, 46, 1133.

67. Friedman, I. , O'Neil, J.R., and Cebula, G. (1982) Two new carbonate stable isotope standards. Geostandards Newsletter, 6, 11-12.

68. Stakes, D.M. and O'Neil, J.R. (1982) Mineralogy and stable isotope geochemistry of hydrothermally altered oceanic rocks. Earth Planet. Sci. Lett., 57, 285-304.

69. Friedman, I., O'Neil, J.R., and Cebula, G. (1982) Reply to "Comment on Two New Carbonate Stable Isotope Standards." Geostandards Newsletter, 6, 259.

70. Brown, E.H. and O'Neil, J.R. (1982) Oxygen isotope geothermometry and stability of lawsonite and pumpellyite in the Shuksan suite, north Cascades, Washington. Contrib. Mineral. Petrol., 80, 240-244.

71. Clauer, N., O'Neil, J.R. and Bonnot-Courtois, C. (1982) The effect of natural weathering on the chemical and isotopic compositions of biotites. Geochim. Cosmochim. Acta, 4, 1755-1762.

73. Valley, J.W. and O'Neil, J.R. (1982) Oxygen isotope evidence for shallow emplacement of Adirondack anorthosite. Nature, 300, 497-500.

74. Chivas, A.R., Andrew, A.S., Sinha, A.K. and O'Neil, J.R. (1982) Geochemistry of a Pliocene-Pleistocene oceanic-arc plutonic complex, Guadalcanal. Nature, 300, 139-143.

75. Kyser, T.K., O'Neil, J.R., and Carmichael, I.S.E. (1982) Genetic relations among basic lavas and ultramafic nodules: evidence from oxygen isotope compositions. Contrib. Mineral. Petrol., 81, 88-102.

76. De Paolo, D.J., Kyte, F.T., Marshall, B.D., O'Neil, J.R., and Smit., J. (1983) Rb-Sr, Sm-Nd, K-Ca, O and H isotopic study of Cretaceous-Tertiary boundary sediments, Caravaca, Spain: evidence for an oceanic impact site. Earth Planet. Sci. Lett., 64, 356-373.

77. Hay, R.L. and O'Neil, J.R. (1983) Carbonatite tuffs in the Laetolil Beds of Tanzania and the Kaiserstuhl in Germany. Contrib. Mineral. Petrol., 82, 403-406.

78. Brigham, R.H. and O'Neil, J.R. (1983) The genesis and movement of water in a two-mica pluton: a stable isotope study. Symposium on Water-Rock Interaction, Misasa, Japan (extended abstract), 63-66.

79. O'Neil, J.R. (1983) Water-rock interactions along active fault zones in California . Symposium on Water-Rock Interaction, Misasa, Japan (extended abstract), 381-384.

80. Nabelek, P.I., O'Neil, J.R., and Papike, J.J. (1984) Vapor phase exsolution as a controlling factor in hydrogen isotope variation in granitic rocks: the Notch Peak granitic stock, Utah. Earth Planet. Sci. Lett., 66, 137-150.

81. Chivas, A.R., O'Neil, J.R. and Katchan, G. (1984) Uplift and submarine formation of some Melanisian porphyry copper deposits: stable isotope evidence. Earth Planet. Sci. Lett., 68, 326-334.

82. Nabelek, P.I. Labotka, T.C., O'Neil, J.R., and Papike, J.J. (1984) Contrasting fluid/rock interaction between the Notch peak granitic intrusion and argillites and limestones in western Utah: evidence from stable isotopes and phase assemblages. Contrib. Mineral. Petrol., 86, 25-34.

83. Valley, J.W. and O'Neil, J.R. (1984) Fluid heterogeneity during granulite facies metamorphism in the Adirondacks: stable isotope evidence. Contrib. Mineral. Petrol., 85, 158-173.

84. Coplen, T.B., Friedman, I. and O'Neil, J.R. (1984) Comment on the International Atomic Energy Agency report on the advisory group meeting on stable isotope reference samples for geochemical and hydrological investigation, Vienna, Austria, September 19-21, 1983. U.S.G.S. Water Res. Invest. Rept. 84-4136, 1-8.

85. Kyser, T.K. and O'Neil, J.R. (1984) Hydrogen isotope systematics of submarine basalts. Geochim. Cosmochim. Acta, 48, 2123-2133.

86. Hildreth, W., Christiansen, R.L. and O'Neil, J.R. (1984) Catastrophic isotopic modification of rhyolitic magma at times of caldera subsidence, Yellowstone Plateau volcanic field. Jour. Geophys. Res., 89, 8338-8369.

87. Johnson, C.M. and O'Neil, J.R. (1984) Triple junction magmatism: a geochemical study of Neogene volcanic rocks in western California. Earth Planet. Sci. Lett., 71, 241-262

88. Smith, H.S., O'Neil, J.R., and Erlank, A.J. (1984) Oxygen isotope compositions of minerals and rocks and chemical alteration patterns in pillow lavas from the Barberton Greenstone Belt, South Africa. In Archean Geochemistry (Kroner, A., Hanson, G.N. and Goodwin, A.M., eds.) Springer-Verlag, New York., 115-137.

89. Ghent, E.D. and O'Neil, J.R. (1985) Late Precambrian marbles of unusual carbon isotope composition, southeastern British Columbia. Canadian Jour. Earth Sci., 22, 324-329.

90. O'Neil, J.R. (1985) Water-rock interactions in fault gouge. Pageoph, 122, 440-446.

91. Brigham, R.H. and O'Neil, J.R. (1985) Genesis and evolution of water in a two-mica pluton: a hydrogen isotope study. Chem. Geol., 49, 159-177.

92. Bowman, J.R., O'Neil, J.R., and Essene, E.J. (1985) Contact skarn formation at Elkhorn, Montana. Am. Jour. Sci., 285, 621-660.

93. O'Neil, J.R., Johnson, C.M., White, L.D., and Roedder, E. (1986) The origin of fluids in the salt beds of the Delaware Basin, New Mexico and Texas. Appl. Geochem., 1, 265-271.

94. Kyser, T.K., O'Neil, J.R., and Carmichael, I.S.E. (1986) Reply to "Possible non-equilibrium oxygen isotope effects in mantle nodules, an alternative to the Kyser-O'Neil-Carmichael 18O/16O geothermometer." Contrib. Mineral. Petrol., 93, 120-123.

95. O'Neil, J.R. (1986) Theoretical and experimental aspects of isotopic fractionation. In Stable Isotopes in High Temperature Geological Processes (eds. J.W. Valley, H.P. Taylor, Jr., and J.R. O'Neil) Rev. Mineral., 16, 1-40.

96. Walker, R.J., Hanson, G.N., Papike, J.J., O'Neil, J.R. and Laul, J.C. (1986) Internal evolution of the Tin Mountain pegmatite, Black Hills, South Dakota. Amer. Mineral., 71, 440-459.

97. Walker, R.J., Hanson, G.N., Papike, J.J., and O'Neil, J.R. (1986) Nd, O and Sr isotope constraints on the origin of Precambrian rocks, Southern Black Hills, South Dakota. Geochim. Cosmochim. Acta, 50, 2833-2846.

98. Levy, S.S. and O'Neil, J.R. (1986) Moderate temperature zeolitic alteration in a cooling pyroclastic deposit, Fifth International Symposium on Water-Rock Interaction (Reykjavik), Extended Abstracts, p. 361-364.

99. Dobson, P.F. and O'Neil, J.R.(1987) Stable isotope composition and water content of boninite series volcanic rocks, from Chichi-jima, Bonin Islands. Japan. Earth Planet. Sci. Lett., 82, 75-86.

100. O'Neil, J.R. (1987) Preservation of H, C, and O isotopic ratios in the low temperature environment. In Stable Isotope Geochemistry of Low Temperature Fluids (T.K. Kyser, ed.) MAC Short Course Handbook, 13, 85-128.

101. Sharp, Z.D. O'Neil, J.R., and Essene, E.J. (1988) Oxygen isotope variations in granulite-grade iron formations: constraints on oxygen diffusion and retrograde isotopic exchange. Contrib. Mineral. Petrol., 98, 490-501.

102. Cerling, T.E., Bowman, J.R., and O'Neil, J.R. (1988) An isotopic study of a fluvial lacustrine sequence; the Plio-Pleistocene Koobi Fora Sequence, East Africa. Palaeogeog., Palaeoclim., Palaeoecol., 63, 335-356.

103. Burkhard, D.J.M. and O'Neil, J.R. (1988) Mineralogy and contrasting serpentinization processes in the eastern central Alps. Contr. Mineral. Petrol., 99, 498-506.

104. Hill, M., O'Neil, J.R., Noyes, H., Frey, F. A., and Wones, D.R. (1988) Sr, Nd, and O isotope variations in compositionally zoned and unzoned plutons in the central Sierra Nevada batholith. Am. Jour. Sci., 288-A (Wones Volume), 213-241.

105. Andrew, A.S. and O'Neil, J.R. (1988) Role of fluids during contact metamorphism: stable isotope evidence from the Rockley Volcanics, eastern Australia. Am. Jour. Sci., 288-A (Wones Volume), 490-511.

106. Glazner, A. and O'Neil, J.R. (1989) Crustal structure of the Mojave Desert, California: Inferences from Sr- and O-isotope studies of Miocene Volcanic Rocks Jour. Geophys. Res., 96, 7861-7870.

107. Garcia, M.O., Muenow, D.W., Aggrey, K.E., and O'Neil, J.R. (1989) Major element, volatile, and stable isotope geochemistry of Hawaiian submarine tholeiitic glasses. J. Geophys. Res., 94, 10,525-10,538.

108. Clauer, N., O'Neil, J.R., Bonnot-Courtois, C., and Holtzapffel, T. (1989) Morphological, chemical and isotopic evidence for an early diagenetic evolution of detrital smectites. Clays and Clay Min., 38, 33-46.

109. Sharp. Z.D. and O'Neil, J.R. (1989) A laser-based carbon reduction technique for oxygen isotope analysis of silicates and oxides. Ann.Rept. Dir. Geophys. Lab., p.72-78.

110. Levy, S.L. and O'Neil, J.R. (1989) Moderate-temperature zeolitic alteration in a cooling pyroclastic deposit. Chem. Geol., 76, 321-326.

111. O'Neil, J.R. and Truesdell, A.H. (1989) Oxygen isotope fractionation studies of solute-water interactions. Epstein 70th Birthday Symposium (Extended Abstracts), p. 13-15.

112. Vrolijk, P., Chambers, S.R., Gieskes, J.M. and O'Neil, J.R. (1990) Stable isotope ratios of interstitial fluids from the Northern Barbados accretionary prism. ODP Leg 110. Proc. ODP, Sci. Results. 110, 189-205.

113. Clauer, N., O'Neil, J.R. and Holtzapfel, T. (1990) Morphologic, chemical, and isotopic evidence for an early diagenetic evolution of smectite in marine sediments. Clays and Clay Min., 38, 33-46.

114. O'Neil, J.R. and Truesdell, A.H. (1991) Oxygen isotope fractionation studies of solute-water interactions. In Stable Isotope Geochemistry: A Tribute to Samuel Epstein . The Geochemical Society, Special Publication No.3 (H.P. Taylor, Jr., J.R. O'Neil and I.R. Kaplan, eds.) p. 17-25.

115. Wickham. S.M., Taylor, H.P., Jr., Snoke, A W., and O'Neil. J.R. (1991) An oxygen and hydrogen isotope study of high-grade metamorphism and anatexis in the Ruby-East Humboldt Range core complex, Nevada. In Stable Isotope Geochemistry: A Tribute to Samuel Epstein . The Geochemical Society, Special Publication No.3 (H.P. Taylor, Jr., J.R. O'Neil and I.R. Kaplan, eds.) p. 373-390.

116. Heller, P. L., Tabor, R., O'Neil, J. R., Pevear, D.R., Shafiqullah, M. and Winslow, N. (1992) Isotopic provenance of Paleogene sandstones from the accretionary core of the Olympic Mountians, Washington. Bull. Geol. Soc. America. 104, 140-153.

117. Singer, B.S., O'Neil, J.R., and Brophy, J.G. (1992) Oxygen isotope constraints on the petrogenesis of Aleutian arc magmas. Geology, 20, 367-370.

118. O'Neil, J.R. (1992) Stable isotope exchange in fluid-mineral systems: old problems, new solutions. Proceedings of the 7th International Symposium on Water/Rock Interaction, 2, 861-864.

119. Masuda, H., Tanaka,H., Gamo, T, O'Neil, J.R., Peacor, D.R. and Jiang, W.-T. (1992) Formation of authigenic smectite and zeolite and associated major element behavior during early diagenesis of volcanic ash in the Nankai Trough, ODP Leg 131. Proceedings of the 7th International Symposium on Water/Rock Interaction, 2, 1659-1662.

120. Brandriss, M.E., Bird, D.K. and O'Neil, J.R. (1992) Dependence of hydrothermal alteration on rock texture and microporosity in mafic crystalline rocks. Proceedings of the 7th International Symposium on Water/Rock Interaction, 2, 1477-1480.

121. Arehart, G.B., Kesler, S.E., O.Neil, J.R. and Foland, K.A. (1992) Evidence for the supergene origin of alunite in sediment-hosted micron gold deposits, Nevada. Econ. Geol., 87, 263-270.

122. Buatier, M.D., Peacor, D.R. and O'Neil, J.R. (1992) Smectite-illite transition in Barbados accretionary wedge sediments: TEM and AEM evidence for a dissolution/crystallization at low temperature. Clays and Clay Min., 40, 65-80.

123. Clauer, N., Stille, P., Keppens, E., et O'Neil, J.R. (1992) Le mécanisme de la glauconitisation: apports de la géochimie isotopique du strontium, du néodyme et de l'oxygène de glauconies récentes. C.R. Acad. Sci. Paris, 315, 321-327.

124. Fricke, H.C., Wickham, S. M., and O'Neil, J.R. (1992) Oxygen and hydrogen isotope evidence for meteoric water infiltration during mylonitic deformation and uplift in the Ruby Mountains-East Humboldt Range core complex, Nevada. Contrib. Mineral. Petrol., 111, 203-221.

125. Vennemann, T.W., Kesler, S.E. and O'Neil, J.R. (1992) Stable isotope compositions of quartz pebbles and their fluid inclusions as tracers of sediment provenance: Implications for gold- and uranium-bearing quartz pebble conglomerates. GEOLOGY, 20, 837-840.

126. Pamic, J., Arkai, P., O'Neil, J.R. and Lantai, C. (1992) Very low- and low-grade progressive metamorphism of upper Cretaceous sediments of Mt. Motajic, Dinarides, Yugoslavia. Spec. Vol. IGCP Proj. 276, 131-146.

127. Conrad, M.E., Petersen, U. and O'Neil, J.R. (1992) Evolution of an Au-Ag producing hydrothermal system: The Tayoltita Mine, Durango, Mexico, Econ. Geol., 87, 1451-1474.

128. Heller, P.L., Renne, P. R. and O'Neil, J.R. (1992) River mixing rate, residence time, and subsidence rate from isotopic indicators: Eocene sandstones of the U.S. Pacific northwest. GEOLOGY, 20, 1095-1098.

129. Vennemann, T.W. and O'Neil, J.R. (1992) A simple and inexpensive method of hydrogen isotope analysis of minerals and rocks based on zinc reagent. Chem. Geol., 103, 227-234.

130. Vennemann, T.W., Muntean, J.L., Kesler, S.E., O'Neil, J.R., Valley, J.W., and Russell, N. (1993) Stable isotope evidence for magmatic fluids in the Pueblo Viejo epithermal acid sulfate Au-Ag deposit, Dominican Republic. Econ. Geol., 88, 55-71.

131. Wickham, Peters, M.T., Fricke, H.C., and O'Neil, J.R. (1993) Core complex plumbing systems: identification of magmatic and meteoric fluid sources and upward and downward moving infiltration fronts. GEOLOGY, 21, 81-84.

132. Arehart, G.B. and O'Neil, J.R. (1993) D/H ratios of supergene alunite as an indicator of paleoclimate in continental settings. Geophys. Monogr. 78 Climate Change in Continental Isotopic Records (P.K. Swart, K.C. Lohmann, J. McKenzie, S. Savin, Eds.) 277-284.

133. Lécuyer, C., Grandjean, P., O'Neil, J.R., Cappetta, H. and Martineau, F. (1993) Thermal excursions in the ocean at the Cretaceous-Tertiary boundary (northern Morocco): δ18O record of phosphatic fish debris. Palaeo., Palaeo., Palaeo., 105, 235-243.

134. Lécuyer, C. and O'Neil, J.R. (1994) Stable isotope compositions of fluid inclusions in biogenic carbonates. Geochim. Cosmochim. Acta, 58, 353-363.

135. Lécuyer, C. and O'Neil, J.R. (1994) Composition des isotopes stables des inclusions fluides dans des carbonates d'origine biogene. Bull. Soc. Geol. France, 165, 573-581.

136. Mullis, J., Dubessy, J., Poty, B. and O'Neil, J. (1994) Fluid regimes during late stages of a continental collision: physical, chemical and stable isotope measurements of fluid inclusions in fissure quartz from a geotraverse through the Central Alps, Switzerland. Geochim. Cosmochim. Acta, 58, 2239-2267.

137. Nevle, R.J., Brandriss, M.E., Bird, D.K., McWilliams, M.O. and O'Neil, J.R. (1994) Tertiary plutons monitor climate change in East Greenland. GEOLOGY, 22, 775-778.

138. O'Neil, J.R., Roe, L., Reinhard, E. and Blake, R.E. (1994) A rapid and precise method of oxygen isotope analysis of biogenic phosphate. Isr. Jour. Earth Sci., 43, 203-212.

139. Masuda, H. and O'Neil;, J.R. (1994) Oxygen isotope heterogeneity of phenocrysts in rhyolite from San Vincenzo, Italy: laser microprobe analysis. Geochem. Jour., 28, 377-385

140. Delgado, J. J. and O'Neil, J.R. (1994) The origin of metasomatic fluids in skarns from La Maladeta (central Pyrenees, Spain); C, O, H, S and Sr isotope compositions. Min. Mag., 58A, 221-222.

141. Clauer, N., O'Neil, J.R. and Furlan, S. (1995) Clay minerals as records of temperature conditions and duration of thermal anomalies in the Paris Basin, France. Clay Minerals, 30, 1-13.

142. Conrad, M.E., O'Neil, J.R. and Petersen, U. (1995) The relation between widespread 18O depletion patterns and precious metal mineralization in the Tayoltita Mine, Durango, Mexico. Econ Geol., 90, 322-342.

143. Brandriss, M.E., Nevle, R.J., Bird, D.K. and O'Neil. J.R. (1995) Imprint of meteoric water on the stable isotope compositions of igneous and secondary minerals, Kap Edvard Holm Complex, East Greenland. Contrib. Mineral. Petrol., 21, 74-86.

144. Fricke, H. C., O'Neil, J.R., and Lynnerup, N. (1995) Oxygen isotope composition of human tooth enamel from Medieval Greenland: Linking climate and society. GEOLOGY, 23, 869-872.

145. Dickens, G.R., O'Neil, J.R., Rea, D.K. and Owen, R.M. (1995) Dissociation of oceanic methane hydrate as a cause of the carbon isotope excursion at the end of the Paleocene. Paleooceanog., 10, 965-971.

146. O'Neil, J.R. and Mughannam, A.J. (1995) Stable Isotope constraints on the origin of the Tuolomne Intrusive Suite, California. Leon T. Silver 70th Birthday Symposium and Celebration (extended abstracts), p. 137-141.

147. Pidgeon, R.T., O'Neil, J.R. and Silver, R.T. (1995) The interdependence of U-Pb stability, crystallinity and external conditions in natural zircons - an early experimental study. Leon T. Silver 70th Birthday Symposium and Celebration (extended abstracts), p. 225-231.

148. Loope, D.B., Kettler, R.M., O'Neil, J.R. and Jones, H.D. (1996) Origin of the anhydrite presursors of quartz geodes in the Mississippian Ramp Creek Formation of Indiana: a test of the sulfide oxidation hypothesis. in Witzke, B.J., Ludvigson, G.A. and Day, J. (eds.) Paleozoic Sequence Stratigraphy: Views from the North American Craton: Boulder, Colorado. Geological Society of America Special Paper 306., pp. 301-305.

149. Thewissen, J.G.M., Roe, L., O'Neil, J.R., Hussain, S.T. Sahni, A. and Bajpai, S. (1996) Evolution of cetacean osmoregulation: Nature, 381, 379-380.

150. Brandriss, M.E., Bird, D.K., O'Neil, J.R. and Cullers, R.L. (1996) Dehydration, partial melting and assimilation of metabasaltic xenoliths in gabbros of the Kap Edvard Holm Complex, East Greenland. Am. J. Sci., 296, 333-393.

151. Vennemann, T.W. and O'Neil, J.R. (1996) Hydrogen isotope fractionation between hydrous minerals and molecular hydrogen. Geochim. Cosmochim. Acta, 60, 2437-2451.

152. Essene, E.J. and O'Neil, J.R. (1996) Presentation of the Mineralogical Society of America award for 1995 to Zachary D. Sharp. Am. Min., 81, 775-776.

153. Clauer, N. O'Neil, J.R., Furlan, S. and Mossmann, J.-R. (1996) Clay minerals as records of temperature conditions and duration of thermal anomalies in the Paris Basin, France: a reply to the discussion by Spötl et al. (1996) Clay Min., 31, 209- 215.

154. Masuda, H., O'Neil, J.R., Jiang, W.-T., and Peacor, D.R. (1996) Relation between interlayer composition of authigenic smectite, mineral assemblages, I/S reaction rate and fluid composition in silicic ash of the Nankai trough. Clays Clay Min. 44, 443-459.

155. Reinhard, E., de Torres, T. and O'Neil, J.R. (1996) 18O/16O Ratios of cave bear tooth enamel: a record of climate variability during the Pleistocene. Palaeo., Palaeo., Palaeo., 126, 45-59.

156. Fricke, H. C. and O'Neil, J.R. (1996) Inter- and intra-tooth variation in the oxygen isotope composition of mammalian tooth enamel: some implications for paleoclimatological and paleobiological research. Palaeo., Palaeo., Palaeo., 126, 91-100.

157. Feldstein, S.F., Lange, R.A., Vennemann, T.W., and O'Neil, J.R. (1996). Ferric-ferrous ratios, H2O contents and D/H ratios of phlogopite and biotite from lavas of different tectonic regimes. Contrib Mineral. Petrol. 126, 51-66.

158. Kim, S.-T. and O'Neil, J.R. (1997) Equilibrium and non-equilibrium oxygen isotope effects in synthetic carbonates. Geochim. Cosmochim. Acta, 61, 3461-3475.

159. Blake, R.E., O'Neil, J.R. and Garcia, G. A. (1997) Oxygen isotope systematics of biologically-mediated reactions of phosphate. I. Microbial degradation of organophosphorous compounds. Geochim. Cosmochim. Acta, 61, 4411-4422.

160. Brandriss, M.E., O'Neil, J.R., Edlund, M.B., and Stoermer, E.F. (1998) Experimental calibration of the oxygen isotope fractionation between diatomaceous silica and water. Geochim. Cosmochim. Acta, 62, 1119-1125.

161. Fricke, H.C., Clyde, W.C., O'Neil, J.R. and Gingerich, P.D. (1998) Intra-tooth variations in δ18O(PO4) of mammalian tooth enamel as a record of seasonal variations in continental climate variables. Geochim. Cosmochim. Acta, 62, 1839-1850.

162. Fricke, H.C., Clyde, W.C., O'Neil, J.R. and Gingerich, P.D. (1998) Evidence for rapid climate change in North America during the latest Paleocene thermal maximum: oxygen isotope compositions of biogenic phosphate from the Bighorn Basin (Wyoming). Earth Planet. Sci. Lett., 160, 193-208.

163. Roe, L.J, Thewissen, J.G.M., Quade, J., O'Neil, J.R., Bajpai, S. and Sahni, A., and Hussain, T. (1998) Isotopic approaches to understanding the terrestrial-to-marine transition of the earliest cetaceans. In H. Thewissen (ed.) The Emergence of Whales, pp. 399-422.

164. Blake, R.E., O'Neil, J.R. and Garcia, G.A. (1998) Effects of microbial activity on the δ18O of dissolved inorganic phosphate and textural features of synthetic apatites. Amer. Mineral., 83, 1516-1531.

165. Clauer, N., Rinckenbach, T., Weber, F., Sommer, F., Chaudhuri, S. and O'Neil, J.R. (1999) Diagenetic evolution of clay mienrals in oil-bearing Neogene sandstones and associated shales, Mahakam Delta Basin (Kalamantan, Indonesia). AAPG Bull., 83, 62-87.

166. Fricke, H., and O'Neil, J.R. (1999) The correlation between surface temperature and 18O/16O ratios of meteoric water: Its use in investigating terrestrial climate change over geologic time. Earth Planet. Sci. Lett., 170, 181-196.

167. Vennemann, T.W., Fricke, H. C., Blake, R. E., O'Neil, J.R. and Colman, A. (2002) Oxygen isotope analysis of phosphates: a comparison of techniques for analysis of Ag3PO4. Chemical Geology, 185, 321-336.

168. O'Neil, J.R. Vennemann, T.W., and McKenzie, W.F. (2003) Effects of speciation on equilibrium fractionations and rates of oxygen isotope exchange between (PO4)aq and H2O. Geochim. Cosmochim. Acta, 67, 3135-3144.