GSA 2020 Connects Online

Session No. 72
Tuesday, 27 October 2020: 1:30 PM-5:30 PM

T14. Strain in the Footwalls of Detachment Faults: New Insights on the 40th Anniversary of the Seminal GSA Memoir “Cordilleran Metamorphic Core Complexes”

GSA Structural Geology and Tectonics Division

 

James J. Vogl, John S. Singleton and Rory R. McFadden, Advocates
Paper #
Start Time
 
1:30 PM
Introductory Remarks
1:35 PM
STRUCTURAL, GEOCHRONOLOGIC, AND THERMOCHRONOLOGIC ANALYSIS OF THE CATALINA DETACHMENT FAULT AND ITS IMMEDIATELY UNDERLYING LOWER PLATE FAULT ROCKS AND STRUCTURES, RINCON MOUNTAINS, ARIZONA (Invited Presentation)
DAVIS, George H.1, BOS ORENT, E.1, FERRONI, F.R.1, GUNS, K.A.2, GEHRELS, G.E.1, GEORGE, S.W.M.1, HANAGAN, C.E.1, HUGHES, A.N.1, IRIONDO, A.3, JEPSON, G.1, KELTY, C.4, KRANTZ, R.W.1, LEVENSTEIN, B.M.1, LINGREY, S.H.1, MIGGINS, D.P.5, MOORE, T.1, PORTNOY, S.E.1, REEHER, L.J.1 and WANG, J.W.1, (1)Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721, (2)Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0225, (3)Centro de Geociencias, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, 76230, Mexico, (4)Geological Sciences, California State University, Long Beach, 1250 Bellflower Blvd, Long Beach, CA 90840, (5)College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331
1:50 PM
DETACHMENT FAULTS AND FOOTWALL MYLONITES: ARE THEY COGENETIC? (Invited Presentation)
WELLS, Michael L. and BARBA, William K., Department of Geoscience, University of Nevada Las Vegas, 4505 S. Maryland Pkwy, Las Vegas, NV 89154-4010
2:05 PM
VORTICITY AND MICROSTRUCTURAL ANALYSIS OF THE WILDHORSE DETACHMENT IN THE PIONEER METAMORPHIC CORE COMPLEX, IDAHO
MCFADDEN, Rory R.1, SCHROEDER, Hannah2, JOHNSON, Isabella2, TEYSSIER, Christian3, TAYLOR, Jennifer M.4, SEATON, Nicholas C.A.5 and GILMAN, Benjamin2, (1)Department of Geology, Gustavus Adolphus College, St. Peter, MN 56082, (2)Geology, Gustavus Adolphus College, 800 W College Ave, St. Peter, MN 56082, (3)Department of Earth Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, (4)Department of Earth & Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, (5)Earth Sciences, University of Minnesota, Minneapolis, MN 55455
2:20 PM
RELATING TI CONCENTRATIONS TO QUARTZ MICROSTRUCTURE IN THE MYLONITIC FOOTWALL OF A DETACHMENT, PIONEER METAMORPHIC CORE COMPLEX, IDAHO
TAYLOR, Jennifer M.1, TEYSSIER, Christian1 and WHITNEY, Donna L.2, (1)Department of Earth & Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, (2)Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN 55455
2:35 PM
FROM BRITTLE TO DUCTILE: THE RELATIONSHIP BETWEEN FOOTWALL FAULTS, MAGMA EMPLACEMENT AND ITS ASSOCIATED HEAT
BOREL, Megan, Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, FL 32611 and VOGL, James J., Department of Geological Sciences, University of Florida, Gainesville, FL 32611
 
2:50 PM
Break
 
3:05 PM
Discussion
3:20 PM
GEOMETRIC EVOLUTION OF DETACHMENT FAULTS AND FOOTWALL SHEAR ZONES IN THE LOWER COLORADO RIVER EXTENSIONAL CORRIDOR, USA
SINGLETON, John S., Department of Geosciences, Colorado State University, 1482 Campus Delivery, Fort Collins, CO 80523
3:35 PM
OCEANIC CORE COMPLEXES: A POORLY UNDERSTOOD MODE OF EXTENSION AT SLOW SPREAD MID-OCEAN RIDGES (Invited Presentation)
JOHN, Barbara, Department of Geology and Geophysics, University of Wyoming, 1000 E. University Ave, Laramie, WY 82071-2000 and CHEADLE, Michael J., Geology and Geophysics, University of Wyoming, 1000 E University Ave, Laramie, WY 82071-2000
3:50 PM
METAMORPHIC CORE COMPLEXES: CRUSTAL-SCALE PARAMETERS CONTROLLING FOOTWALL BEHAVIORS
TEYSSIER, Christian1, WHITNEY, Donna L.2, KORCHINSKI, Megan2 and REY, Patrice F.3, (1)Department of Earth Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, (2)Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN 55455, (3)School of Geosciences, The University of Sydney, Sydney, NSW 2006, Australia
4:05 PM
ACCOMMODATION OF EOCENE CRUSTAL EXTENSION THROUGH ISOSTATICALLY-INDUCED DECOUPLED CRUSTAL FLOW, IN THE PIONEER MOUNTAINS METAMORPHIC CORE COMPLEX (IDAHO-US)
ORTIZ-GUERRERO, Carolina, VOGL, James J. and FOSTER, David A., Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, FL 32611
4:20 PM
BITTERROOT AND ANACONDA CORE COMPLEXES: CRETACEOUS DUCTILE FLOW AND EOCENE DETACHMENT FAULTING IN THE NORTHERN U.S. ROCKY MOUNTAINS
FOSTER, David A., Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville Florida, FL 32611 and KALAKAY, Thomas J., Rocky Mountain College, 1511 Poly Drive, Billings, MT 59102-1739
4:35 PM
ONSET OF EOCENE-OLIGOCENE EXTENSION RECORDED BY DETRITAL ZIRCON PROVENANCE IN THE TITUS CANYON FORMATION, DEATH VALLEY, CA
MIDTTUN, Nikolas C., NIEMI, Nathan A. and GALLINA, Bianca, Earth and Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, MI 48109
 
4:50 PM
Break
5:05 PM
EOCENE BASIN RECORD OF METAMORPHIC CORE COMPLEX EXHUMATION IN THE WESTERN UNITED STATES CORDILLERA
THORESEN, Haley E., Department of Geological Sciences, University of Idaho, 875 Perimeter Hall, McClure Hall 203, Moscow, ID 83843 and CASSEL, Elizabeth J., Geological Sciences, University of Idaho, 875 Perimeter Drive MS 3022, Moscow, ID 83844
5:15 PM
PHYLLOSILICATES DISTRIBUTION, SPATIAL ARRANGEMENT AND INTERCONNECTIVITY: IMPLICATIONS FOR RHEOLOGICAL WEAKENING AND STRAIN LOCALIZATION IN DETACHMENT SHEAR ZONES (RAFT RIVER MOUNTAINS, UT)
MORRIS, Kristen1, GOTTARDI, Raphaël1 and CASALE, Gabriele2, (1)School of Geosciences, University of Louisiana at Lafayette, 611 McKinley Street, Hamilton Hall, Lafayette, LA 70504, (2)Geological and Environmental Sciences, Appalachian State University, 572 Rivers Street, Boone, NC 28608
 
5:25 PM
Discussion
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