Chercheurs

Sciences de la Terre / REYNOLDS, STEPHEN J.

sreynolds

Position

Professor of Geology at Arizona State University, School of Earth and Space Exploration.

Thèmes de recherche

Professor Reynolds has an interdisciplinary, field-oriented research program incorporating geologic mapping, structural geology, regional tectonics, geochemistry, thermochronology, ore deposits, and the role of fluids in tectonic processes. A major goal of this research is to investigate how processes involved in the evolution of continents vary with depth.

The tectonic evolution of southwestern North America is complex and has resulted in the exposure of rocks and structures formed at various crustal levels. This provides an opportunity to examine variations in structural style, deformational mechanism, and fluid processes with depth. Prof. Reynolds was one of the first geologists to do detailed structural and geochronologic studies on detachment faults and metamorphic core complexes, and helped discover nearly 10 core complexes in Arizona and adjacent regions. For example, the South Mountains metamorphic core complex adjacent to the ASU campus contains Tertiary mylonite and fault breccia that record the rapid ascent of the rocks through the brittle-ductile transition during extensional tectonism and detachment faulting. In this one mountain range, deformational processes and fluid regimes below the brittle-ductile transition can be compared with those typical of the upper crust.

Field studies, including geologic mapping and modern techniques of structural analysis, are an integral component of most geologic investigations. Geologic field projects of Professor Reynolds, his colleagues, and students are presently focused on (1) kinematics and evolution of major faults and ductile shear zones, (2) mechanisms of crustal extension, basement-involved thrusting, and severe structural attenuation, (3) the relation between fluids and structures, (4) Cenozoic tectonics of the Colorado Plateau - Basin and Range boundary in central Arizona, and (5) applications of TIMS (thermal infrared mapping spectrometer) to bedrock and surficial geologic mapping. These studies concentrate on, but are not restricted to, western North America.

Interactions between fluids and rocks play a major role in the evolution of continental crust, as expressed by metasomatism, hydrothermal mineralization and alteration, and the formation of many fluid-controlled structures. The nature of fluid-rock interactions are being investigated by integrated structural, geochemical, metamorphic, fluid-inclusion, and thermochronologic studies.

In recognition of his expertise in geologic mapping, Prof. Reynolds was appointed by the U.S. Secretary of the Interior to the National Geologic Mapping Advisory Committee. He has also been President of the Arizona Geological Society and has served on various other National and local committees.

Prix et récompenses

ASU Geology Department Outstanding Professor for Excellence in Teaching and Guidence of Students, 1992, 1993, and 1996
Nominated for College of Liberal Arts and Sciences Distinguished Teaching Award, 1993
National Association of Geoscience Teachers Distinguish Lecturer (1998-2000)
Nominated for Parents Association Professorship (1996)
First-ever Teacher of the Month on ASU Website, February 1997
USGS award for outstanding service, 1974

Publications

Books and Mondo Reports

Coney, P.J., and Reynolds, S.J., eds., 1980, Cordilleran metamorphic core complexes and their uranium favorability: U.S. Department of Energy Open-File Report GJBX-258 (80), 627 p.

Jenney, J.P., and Reynolds, S.J., eds., 1989, Geologic evolution of Arizona: Arizona Geological Society Digest 17, 866 p.

National Reseach Council, 1995, Ward Valley: an examination of seven issues in Earth Sciences and Ecology: National Academy Press, 212 p.

Davis, G.H., and Reynolds, S.J., 1996, Structural Geology of Rocks and Regions (2nd Edition): New York, John Wiley and Sons, Inc., 776 p.

Journal Articles and Chapters in Books

Coney, P.J., and Reynolds, S.J., 1977, Cordilleran Benioff zones: Nature, v. 270, p. 403-406.

Reynolds, S.J., and Rehrig, W.A., 1980, Mid-Tertiary plutonism and mylonitization, South Mountains, central Arizona, in Crittenden, M.D., Coney, P.J., and Davis, G.H., eds., Cordilleran Metamorphic core complexes: Geological Society of America Memoir 153, p. 159-174.

Rehrig, W.A., and Reynolds, S.J., 1980, Geologic and geochronologic reconnaissance of a northwest-trending zone of metamorphic core complexes in southern and western Arizona, in Crittenden, M.D., Coney, P.J., and Davis, G.H., eds., Cordilleran Metamorphic core complexes: Geological Society of America Memoir 153, p. 131-156.

Keith, S.B., Reynolds, S.J., Damon, P.E., Shafiqullah, M., Livingston, D.E., and Pushkar, P.D., 1980, Evidence for multiple intrusion and deformation within the Santa Catalina-Rincon-Tortolita crystalline complex, in Crittenden, M.D., Coney, P.J., and Davis, G.H., eds., Cordilleran Metamorphic core complexes: Geological Society of America Memoir 153, p. 217-266.

Reynolds, S.J., 1980, Geologic framework of west-central Arizona, in Jenney, J.P., and Stone, Claudia, eds., Studies in western Arizona: Arizona Geological Society Digest v. 12, p. 1-16.

Reynolds, S.J., Keith, S.B., and Coney, P.J., 1980, Stacked overthrusts of Precambrian crystalline basement and inverted Paleozoic sections emplaced over Mesozoic strata, west-central Arizona, in Jenney, J.P., and Stone, Claudia, eds., Studies in western Arizona: Arizona Geological Society Digest, v. 12, p. 45-51.

Reynolds, S.J., and Spencer, J.E., 1985, Evidence for large-scale transport on the Bullard detachment fault, west-central Arizona: Geology, v. 13, p. 353- 356.

Reynolds, S.J., 1985, Geology of the South Mountains, central Arizona: Arizona Bureau of Geology and Mineral Technology Bulletin 195, 61 p., scale 1:24,000.

Davis, G.A., Lister, G.S., and Reynolds, S.J., 1986, Structural evolution of the Whipple and South Mountains shear zones, southwestern United States: Geology, v. 14, p. 7-10.

Reynolds, S.J., Shafiqullah, M., Damon, P.E., and DeWitt, Ed, 1986, Early Miocene mylonitization and detachment faulting, South Mountains, central Arizona: Geology, v. 14, p. 283-286.

Reynolds, S.J., Spencer, J.E., Richard, S.M., and Laubach, S.E., 1986, Mesozoic structures in west-central Arizona, in Beatty, B. and Wilkinson, P. A. K., eds., Frontiers in geology and ore deposits of Arizona and the Southwest: Arizona Geological Society Digest, v. 16, p. 35-51.

Reynolds, S.J., and Lister, G.S., 1987, Structural aspects of fluid-rock interactions in detachment zones: Geology, v. 15, p. 362-366.

Reynolds, S.J., Spencer, J.E., and DeWitt, Ed, 1987, Stratigraphy and U-Th-Pb geochronology of Triassic and Jurassic rocks in west-central Arizona, in Dickinson, W.R., and Klute, M.A., eds., Mesozoic rocks of southern Arizona and adjacent areas: Arizona Geological Society Digest, v. 18, p. 65-80.

Reynolds, S.J., Richard, S.M., Haxel, G.M., Tosdal, R.M., and Laubach, S.E., 1988, Geologic setting of Mesozoic and Cenozoic metamorphism in Arizona, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States: Englewood Cliffs, New Jersey, Prentice- Hall, p. 466-501.

Roddy, M.S., Reynolds, S.J., Smith, B.M., and Ruiz, J., 1988, K-metasomatism and detachment-related mineralization, Harcuvar Mountains, Arizona: Geological Society of America Bulletin, v. 100, p. 1627-1639.

Reynolds, S.J., 1988, Geologic Map of Arizona: Arizona Geological Survey Map 26, scale 1:1,000,000.

Reynolds, S.J., Spencer, J.E., Asmerom, Yemane, DeWitt, Ed, and Laubach, S.E., 1989, Early Mesozoic uplift in west-central Arizona and southeastern California: Geology, v. 17, p. 207-211.

Spencer, J.E., and Reynolds, S.J., eds., 1989, Geology and mineral resources of the Buckskin and Rawhide Mountains, west-central Arizona: Arizona Geological Survey Bulletin 198, 280 p.

Laubach, S.E., Reynolds, S.J., Spencer, J.E., and Marshak, S., 1989, Progressive deformation and superposed fabrics related to Cretaceous crustal underthrusting in western Arizona, U.S.A.: Journal of Structural Geology, v. 11, p. 735-749.

Spencer, J.E., and Reynolds, S.J., 1989, Middle Tertiary tectonics of Arizona and adjacent areas, in Jenney, J.P., and Reynolds, S.J., eds., Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 539-573.

Reynolds, S.J., and Lister, G.S., 1990, Folding of mylonitic zones in Cordilleran metamorphic core complexes -- Evidence from near the mylonitic front: Geology, v. 18, p. 216-219.

Spencer, J.E., and Reynolds, S.J., 1990, Relationship between Mesozoic and Cenozoic tectonic features in west-central Arizona and adjacent southeastern California: Journal of Geophysical Research, v. 95, p. 539-555.

Potochnik, A.R., and Reynolds, S.J., 1990, Side canyons of the Colorado River, Grand Canyon, in Beus, S.S., and Morales, Michael, eds., Grand Canyon Geology: Oxford University Press, p. 461-481.

Spencer, J.E., and Reynolds, S.J., 1991., Tectonics of mid-Tertiary extension along a transect through west-central Arizona: Tectonics, p. 1204-1221.

Reynolds, S.J., and DeWitt, Ed, 1991, Proterozoic geology of the Phoenix region, central Arizona: Arizona Geological Society Digest 19, p. 237-250.

Smith, B.M., Reynolds, S.J., Day, H.W., and Bodnar, R., 1991., Deep-seated fluid involvment in ductile-brittle deformation and mineralization, South Mountains metamorphic core complex, Arizona: Geological Society of America Bulletin, v. 103, p. 559-569.

Laubach, S.E., Vendeville, B.C., and Reynolds, S.J., 1992, Patterns in the development of extensional fault block shapes from comparison of outcrop-scale faults and experimental physical models, in Larsen, R.M., ed., Structural and tectonic modeling and its application to petroleum geology: Norwegian Petroleum Society Special Publication 1, Amsterdam, Elsevier, p. 231-241.

Livacarri, R.F., Geissman, J.W., and Reynolds, S.J., 1993, Paleomagnetic evidence for large-magnitude, low-angle normal faulting in a metamorphic core complex: Nature, v. 361, p. 56-59.

Foster, D.A., Gleadow, A.J.W., Reynolds, S.J., and Fitzgerald, P.G., 1993, Denudation of metamorphic core complexes and the reconstruction of the Transition Zone, west-central Arizona; Constraints from apatite fission track thermochronology: Journal of Geophysical Research, v. 98, p. 2167-2185.

Fitzgerald, P.G., Reynolds, S.J., Stump. E., Foster, D.A., and Gleadow, A.J.W., 1994, Thermochronologic evidence for timing of denudation and rate of crustal extension of the South Mountains metamorphic core complex and Sierra Estrella, Arizona: Nuclear Tracks and Radiation Measurement, v. 21, p. 555-563.

Livaccari, R.F., Geissman, J.W., and Reynolds, S.J., 1995, Large-magnitude extensional deformation in the South Mountains metamorphic core complex, Arizona: evaluation with paleomagnetism: Geological Society of America Bulletin, v. 107, p. 877-894.

Spencer, J.E., Richard, S.M., Reynolds, S.J., Miller, R.J., Shafiqullah, M., Gilbert, W.G., and Grubensky, M.J., 1995, Spatial and temporal relationships between mid-Tertiary magmatism and extension in southwestern Arizona: Journal of Geophysical Research, v. 100, p. 10,321-10,351.

Reynolds, S.J., Spencer, J.E., Laubach, S.E., Peacock, S.S., Richard, S.M., and Cunningham, W.D., 1996, Geologic setting of mineral deposits of the Granite Wash Mountains, La Paz County, west-central Arizona, in Rehrig, W.A., ed., Tertiary extension and mineral deposits, southwestern U.S.: Society of Exploration Geologists Guidebook Series, v. 25, p. 141-155.

Faulds, J.E., Schreiber, B.C., Reynolds, S.J., Okaya, D., and Gonzalez, L., 1997, Origin and paleogeography of an immense, nonmarine Miocene salt deposit in the Basin and Range (western U.S.A.): Journal of Geology, v. 105, p. 19-36.

Pappalardo, R.T., Reynolds, S.J., and Greeley, R., 1997, Extensional tilt blocks on Miranda: Evidence for an upwelling origin of Arden Corona: Journal of Geophysical Research, v. 102, p. 13,369-13,379.

Faulds, J.E., Schreiber, B.C., Reynolds, S.J., Okaya, D., and Gonzalez, L., 1997, Origin and paleogeography of an immense, nonmarine Miocene salt deposit in the Basin and Range (western U.S.A.): Journal of Geology, v. 105, p. 19-36.

Kruger, J.M., Faulds, J.E., Reynolds, S.J., and Okaya, D.A., 1998, Seismic reflection evidence for detachment polarity beneath a major accommodation zone, west-central Arizona, in Faulds, J.E., and Stewart, J.H., eds., Accommodation Zones and Transfer Zones: The Regional Segmentation of the Basin and Range Province: Boulder, Colorado, Geological Society of America Special Paper 323, p. 89-113.

Reynolds, S.J., and Peacock, S.M., 1998, Slide observations — promoting active observation, landscape appreciation, and critical thinking in introductory geology courses: Journal of Geoscience Education, v. 46, p. 421-426.

Reynolds, S.J., Goodwin, L.B., Lister, G.S., Ellzey, P.D., and Ferranti, C.J., 1998, Development of ultramylonite from pseudotachylyte, South Mountains metamorphic core complex, Arizona, in Snoke, A.W., Tullis, J.A., and Todd, V.R., eds., Fault-related rocks — a photographic atlas: Princeton, Princeton University Press, p. 124-125.

Goodwin, L.B., Reynolds, S.J., Ferranti, C.J., Ellzey, P.D., and Lister, G.S., 1998, Pseudotachylyte from the South Mountains metamorphic core complex, in Snoke, A.W., Tullis, J.A., and Todd, V.R., eds., Fault-related rocks — a photographic atlas: Princeton, Princeton University Press, p. 122-123.