Oregon State University

College of Earth, Ocean, and Atmospheric Sciences

Directory of People

John Dilles

John Dilles photo
Discipline: Geology and Geophysics
Office: Wilkinson 146
Phone: 541-737-1245
Fax: 541-737-1200
Email: dillesj@geo.oregonstate.edu


Geology and geochemistry of mineral deposits, field geology

Research Interests

Economic geology (origin of metallic mineral deposits, especially porphyry copper and related deposits of western North America and South America), structural geology, igneous petrology, stable isotopes, isotopic ages


BS Geology, California Institute of Technology, Pasadena, 1975
MS Geology, California Institute of Technology, Pasadena, 1976
PhD Geology, Stanford University, 1984


GEO 310 - Earth Materials I: Mineralogy (4 cr)
GEO 440/540 - Economic Geology (4 cr)
GEO 495 - Advanced Field Geology (6 cr)
GEO 497/597 - Field Mapping of Ore Deposits (3 cr)
GEO 516  Interpretation of Geologic Maps (2 cr)
GEO 694 - Topics in Ore Genesis (1-3 cr)

Graduate Students

Nansen Olson (MS, 2015)
The Geology, Geochronology, and Geochemistry of the Kaskanak Batholith, and other Late Cretaceous to Eocene magmatism at the Pebble Porphyry Cu-Au-Mo deposit, SW Alaska

Stephanie Wafforn (MS, 2013)
Structural Geology of the Mount Polley Cu-Au District, South-Central British Columbia (co-advised with Andrew Meigs)

Lucian P. Farmer (MS, 2013)
Trace Element Characteristics of Zircon: A Means of Assessing Mineralization Potential of Intrusions in Northern Nevada (co-advised with Adam Kent)

Darrick E. Boschmann (MS, 2013)
Structural and volcanic evolution of the Glass Buttes area, High Lava Plains, Oregon (coadvised with Andrew Meigs)

Julia Cohen (MS, 2011)
Mineralogy and geochemistry of hydrothermal alteration at the Ann-Mason porphyry copper deposit, Nevada: Comparison of large-scale ore exploration techniques to mineral chemistry

Abigail Stephens (MS, 2011)
Mineralogy and origin of copper mineralization in the Plumas copper belt, northern California.

Federico Cernuschi (MS, 2011)
Geology of the Cretaceous Lascano-East Intrusive Complex: Magmatic evolution and mineralization potential of the Merín Basin, Uruguay

Robert Lee (PhD, 2008)
Genesis of the El Salvador Porphyry-Copper Deposit, Chile and Distribution of Epithermal Alteration at Lassen Peak, California

Zachary Gonsior (MS, 2006)
Timing and evolution of Cenozoic extensional normal faulting in the southern Tobin Range , northwestern Nevada.

Greg Brennecka (MS, 2006)
Petrology of magmatic sulfides in ore-forming silicic igneous rocks, Yanacocha, Peru and Yerington, Nevada

Joanna Lipske (MS, 2002)
Advanced argillic and sericitic alteration in the Buckskin Range, Nevada: A product of ascending magmatic fluids from the deeper Yerington porphyry copper environment

Tony Longo (PhD, 2005), (co-advisor with Grunder)
Volcanology, igneous petrology, and geochronology of the Yanacocha Volcanic Complex, Cajamarca , Peru , and relation to mineralization

Robert A. Houston (MS, 2001)
Geology and structural history of the Butte district, Montana

Alexander Raab (MS, 2001)
Geology of Fe-oxide-Cu-Au mineralization at Cerro Negro Corte, Coastal Cordillera, northern Chile

Lihua Zhang (PhD, 2000)
Stable isotope investigation of a hydrothermal alteration system: Butte porphyry copper deposit, 182 p.


Halley, S., Dilles, J.H., & Tosdal, R.M., 2015, Footprints: Hydrothermal alteration and geo-chemical dispersion around porphyry copper deposits: SEG Newsletter, no. 100; p. 1, 12-17.

Dilles, J. H., Kent, Adam J.R, Wooden, Joseph L., Tosdal, R.M., Koleszar, Alison, Lee, Robert G., and Farmer, Lucian P., 2015, Zircon compositional evidence for sulfur-degassing from ore-forming arc magmas:  Economic Geology, v. 110, p. 241-251.

Cernuschi, F., Dilles, J.H., Kent, A.J.R., Schroer, G, Raab, A.K.,Conti, B., and Muzio, R., 2015, Geology, geochemistry and geochronology of the Cretaceous Lascano East intrusive complex and magmatic evolution of the Laguna Merín basin, Uruguay Gondwana Research, doi:10.1016/j.gr.2014.07.007

Parsapoor, A., Khalili, M., Dilles, J.H., Mackizadeh, M. A., and Maghami, M. 2014, Stable isotope record of hydrothermal sulfate, sulfide and silicate minerals in the Darreh-Zar porphyry copper deposit in Kerman, southeastern Iran: Implications for petrogenesis and exploration:  J. Geochem. Exploration, v. 143, p. 103-115.

Maydagán, L., Franchini, M., Chiaradia, M., Dilles, J.; and Rey, R., 2014, The Altar porphyry Cu-(Au-Mo) deposit (Argentina):  a complex magmatic-hydrothermal system with evidence of recharge processes:  Economic Geology, 109(3), 621-641. doi:10.2113/econgeo.109.3.621

Chambefort, I.,  Dilles, J.H., and Longo, A.A., 2013, Amphibole geochemistry of the Yanacocha Volcanics, Peru: evidence for diverse sources of magmatic volatiles related to gold ores:   Journal of Petrology, Vol. 54, Issue 5, pp. 1017-1046.

Houston, R. A. and Dilles, J. H., 2013, Structural geologic evolution of the Butte district, Montana: Economic Geology, v. 108, no. 6, p. 1397-1424.

Walker, B.A., Klemetti, E., Grunder, A., Dilles, J., Tepley, F., Giles, D., 2013, Crystal reaming during the assembly, maturation and waning of an eleven-million-year crustal magma cycle: thermobarometry of the Aucanquilcha Volcanic cluster:  Contributions to Mineralogy & Petrology, v. 165, p. 663-682.

Hecker, Christoph, Dilles, John H., van der Meijde, Mark, and van der Meer, Freek D., 2012, Thermal infrared spectroscopy and partial least squares regression to determine mineral modes of granitoid rocks:  G cubed (Geochemistry, geophysics, geosystems), Volume 13, Number 3, (15 p.), Q03021, doi:10.1029/2011GC004004  ISSN: 1525-2027

Dilles, J.H. and Stephens, A., 2011, Age and geology of the Jurassic Lights Creek copper district, Calfornia: An Fe-oxide copper gold association: in Steininger, R., and Pennell, B., eds., Geological Society of Nevada, 2010 Symposium Volume, v. 2, p. 1007-1018.

Barton, M.D., Dilles, J.H., Girardi, J., Haxel, G., Johnson, D., Kreiner, D., Seedorff, E., and Zurcher, L., 2011, Jurassic igneous-related metallogeny of southwestern North America:  Geological Society of Nevada, 2010 Symposium Volume, v. 1, p. 373-396.

Longo, A.A.,  Dilles, J.H., Grunder, A.L., and Duncan, R., 2010, Evolution of calc-alkaline volcanism and associated hydrothermal gold deposits at Yanacocha, Perú:  Economic Geology. v. 105, p. 1191-1241 plus geology map plate.

Tomlinson, A.J., Blanco P., N., and Dilles, J.H., 2010, Carta Calama, Region de Antofagasta:  Carta Geológica de Chile, Serie Preliminar, No. 8, Subdirection Nacional de Geologia (Sernageomin), escala 1:50,000.

Dilles, J.H., 2009, A series of papers on fluid – mineral equilibrium applied to mineral deposits: A preface: Economic Geology, v. 104, p. 1169-117.

Tosdal, R.M., Dilles, J.H., and Cooke, D.R., 2009, From source to sinks in auriferous magmatic-hydrothermal porphyry and epithermal deposits: Elements, v. 5, p. 289-295.

Chambefort, I., Dilles, J.H., and Kent, J.R., 2008, Anhydrite-bearing andesite and dacite as a source for sulfur in magmatic-hydrothermal mineral deposits: Geology, vo. 36, no. 9, p. 719-722.

Gonsior, Z.J. and Dilles, J.H., 2008, The Timing and Evolution of Cenozoic Extensional Normal Faulting and Magmatism in the Southern Tobin Range, Nevada: Geosphere, Vol 4, Issue 4, p. 687-712.

Rusk, B., Reed, M.H., and Dilles, J.H., 2008, Fluid inclusion evidence for magmatic-hydrothermal fluid evolution in the porphyry copper-molybdenum deposit, Butte, Montana: Economic Geology, v. 103, p. 307-334.

Proffett, John M., and Dilles, John H., 2008, Lower Mesozoic sedimentary and volcanic rocks of the Yerington region, Nevada, and their regional context: in editors, Wright, J.E., and John Shervais, J.W., eds., Ophiolites, Arcs, and Batholiths: A Tribut to Cliff Hopson; Geol. Soc Amer Spec Paper 438, p. 251-288.

Brimhall, G.H., Dilles, J.H., and Proffett, J.M., Jr., 2006, The role of geologic mapping in modern mineral exploration: in, Doggett, M.D., and Parry, J.R., eds., Special Publication 12, Society of Economic Geologists, p. 221-241.

Rusk, Brian G., Reed, Mark H., Dilles, John H. and Kent, Adam J. R., 2006, Intensity of quartz cathodoluminescence and trace element content in quartz from the porphyry copper deposit in Butte , Montana , USA : Amer. Mineralogist, v. 91, . 1300-1312.

Seedorff, E., Dilles, J.H., Proffett, J.M., Jr., Einaudi, M.T., Zurcher, L., William J. A. Stavast, W. J.A., Johnson, D.A., Barton, M.D., 2005, Porphyry-Related Deposits: Characteristics and Origin of Hypogene Features: in Hedenquist, J., Thompson, J.F., Richards, J., eds., 100 th Anniversary Volume, Society of Economic Geologists, p. 251-298.

Simeone R., Dilles J. H., Padalino G. and Palomba M., 2005, Mineralogical and stable isotope studies of kaolin deposits: shallow epithermal systems of western Sardinia ( Italy ): Economic Geology, v. 100, p. 115-130.

C.W. Field, Zhang, L., Dilles, J.H., Rye, R.O., and Reed, M.H., 2005, Sulfur and oxygen Pre-Main Stage Porphyry Cu-Mo and Late Shallow Main Stage Base Mineral Deposits, Butte District, Montana : .Chemical Geology (Robert Rye volume); v. 215, p. 61-93

Rusk, B., Reed, M.H., Dilles, J.H., Klemm, L., and Heinrich , C.A. , 2004, Compositions of magmatic hydrothermal fluids determined by LA-ICP-MS of fluid inclusions from the porphyry copper-molybdenum deposit at Butte , Montana : Chemical Geology, vol. 210, p. 173-199.

Geiger, S., Haggerty, R., Dilles, J. H., Reed, M.H., and Matthäi, S.F., 2002, The Evolution Of The Early Hydrothermal Alteration At Butte , Montana : New Insights From Reactive Transport Modeling: Geofluids, v. 2, p. 185-201

Tomlinson, A.J., Dilles, J.H., and Maksaev, V., 2001, Application Of Apatite (U-Th)/He Thermochronometry To The Determination Of The Sense And Amount Of Vertical Fault Displacement At The Chuquicamata Porphyry Copper Deposit , Chile – A Discussion: Economic Geology, v. 96, No. 5, 1307-1309.

Streck, M.J., and Dilles, J.H., 1998, Sulfur content of oxidized arc magmas as recorded in apatite from a porphyry copper batholith: Geology, v. 26, no. 6, p. 523-526.