Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 3–5, 2004)

Session No. 23
Tuesday, 4 May 2004: 8:00 AM-12:00 PM

T9. Eocene Extension of the Northern Rocky Mountains Region

 

David A. Foster and Thomas J. Kalakay, Advocates
Paper #
Start Time
1
8:00 AM
GEOCHRONOLOGIC CONSTRAINTS ON THE TECTONIC EVOLUTION OF THE BOEHLS BUTTE-CLEARWATER CORE COMPLEX: EVIDENCE FROM 1.01 GA GARNETS
SHA, Grant S.1, VERVOORT, Jeffery D.1, WATKINSON, A. John1, DOUGHTY, P. Ted2, PRYTULAK, Julie1, LEE, Robert G.1 and LARSON, Peter B.1, (1)Department of Geology, Washington State Univ, Pullman, WA 99164, (2)Department of Geology, Eastern Washington Univ, Cheney, WA 99004, sha@mail.wsu.edu, sha@mail.wsu.edu
2
8:20 AM
U-PB DATING OF PLUTONS ALONG THE TRANSFER ZONE BETWEEN THE BITTERROOT AND PRIEST RIVER METAMORPHIC CORE COMPLEXES
BURMESTER, Russell F., Geology Department, Western Washington Univ, Bellingham, WA 98225-9080, MCCLELLAND, William C., Department of Geological Sciences, Univ of Idaho, Moscow, ID 83844 and LEWIS, Reed S., Idaho Geological Survey, Univ of Idaho, Moscow, ID 83844-3014, russb@cc.wwu.edu, russb@cc.wwu.edu
3
8:40 AM
EOCENE ELEVATION OF CORDILLERA RECORDED IN STABLE ISOTOPIC COMPOSITION OF DETACHMENT MYLONITES
MULCH, Andreas, Institute of Mineralogy and Geochemistry, Univ of Lausanne, BFSH-2, Lausanne, 1015, Switzerland and TEYSSIER, Christian, Geology & Geophysics, Univ of Minnesota, Minneapolis, MN 55455, andreas.mulch@img.unil.ch, andreas.mulch@img.unil.ch
4
9:00 AM
GEOLOGIC SIGNATURE OF PALEOGENE RIDGE SUBDUCTION AND SLAB WINDOW FORMATION BENEATH THE CENTRAL NORTH AMERICAN CORDILLERA
BREITSPRECHER, Katrin1, MADSEN, Julianne K.2, ICKERT, Ryan B.2 and THORKELSON, Derek J.3, (1)Earth and Ocean Sciences, Univ of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada, (2)Earth Sciences, Simon Fraser Univ, 8888 University Dr, Burnaby, BC V5A 1S6, (3)Earth Sciences, Simon Fraser Univ, 8888 University Dr, Burnaby, BC V5A 1S6, Canada, kbreitsp@eos.ubc.ca, kbreitsp@eos.ubc.ca
5
9:20 AM
EOCENE FLOW OF PARTIALLY MOLTEN CRUST IN THE NORTH AMERICAN CORDILLERA
TEYSSIER, Christian, KRUCKENBERG, Seth and WHITNEY, Donna L., Geology & Geophysics, Univ of Minnesota, Minneapolis, MN 55455, teyssier@umn.edu, teyssier@umn.edu
6
9:40 AM
KINEMATICS OF EOCENE METAMORPHIC CORE COMPLEXES IN THE NORTHERN ROCKY MOUNTAINS
FOSTER, David A., Dept. of Geology, Univ of Florida, PO Box 112120, Gainesville, FL 32611-2120, KALAKAY, Thomas J., Department of Earth and Environmental Sciences, Vanderbilt Univ, Nashville, TN 37235, DOUGHTY, P. Ted, Department of Geology, Eastern Washington Univ, Cheney, WA 99004, FANNING, C. Mark, Research School of Earth Sciences, The Australian National Univ, Canberra, ACT, 0200, Australia and VOGL, James J., Geological Sciences, Univ of Florida, Gainesville, FL 32611, dfoster@geology.ufl.edu, dfoster@geology.ufl.edu
 
10:00 AM
Break
7
10:20 AM
EOCENE EXTENSION IN NORTHWESTERN UTAH-SOUTHERN IDAHO: EARLY MOTION ON THE POLYPHASE MIDDLE MOUNTAIN SHEAR ZONE
WELLS, Michael L.1, SHEELEY, Jay C.1, SPELL, Terry L.1, KELLY, Eric D.2 and HOISCH, Thomas D.2, (1)Department of Geoscience, Univ of Nevada Las Vegas, Las Vegas, NV 89154-4010, (2)Geology, Northern Arizona Univ, Box 4099, Flagstaff, AZ 86011, mlwells@unlv.nevada.edu, mlwells@unlv.nevada.edu
8
10:40 AM
GROWTH AND COLLAPSE OF THE SEVIER OROGENIC WEDGE: NEW EVIDENCE FROM THE CORDILLERA OF WESTERN MONTANA
KALAKAY, Thomas J., Department of Earth and Environmental Sciences, Vanderbilt Univ, Nashville, TN 37235, FOSTER, David A., Dept. of Geology, Univ of Florida, PO Box 112120, Gainesville, FL 32611-2120 and LONN, Jeffrey D., Montana Bureau of Mines and Geology, Montana Tech, 1300 West Park Street, Butte, MT 59701-8997, thomas.j.kalakay@vanderbilt.edu, thomas.j.kalakay@vanderbilt.edu
9
11:00 AM
ANOMALOUS LONGITUDINAL DISPERSAL OF SEDIMENT FROM OLDER, MORE EXTENDED TO YOUNGER, LESS EXTENDED SEGMENTS OF AN EOCENE-OLIGOCENE FOLD-PRONE RIFT ZONE, SW MONTANA
JANECKE, Susanne U., Dept. of Geology, Utah State Univ, Logan, UT 84322-4505, LINK, Paul K., Geosciences, Idaho State Univ, P.O. Box 8072, Pocatello, ID 83209, MCINTOSH, William, Dept. of Geoscience, New Mexico Inst. of Mining and Technology, Socorro, NM 87801, FANNING, Mark, Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia and DORSEY, Rebecca, Geological Sciences, Univ of Oregon, Eugene, OR 97403-1272, sjanecke@cc.usu.edu, sjanecke@cc.usu.edu
10
11:20 AM
FOUR DISTINCT MID-EOCENE AND OLIGOCENE FLUVIAL SYSTEMS, GRASSHOPPER AND BEAVERHEAD BASINS, SW MONTANA
LINK, Paul Karl, Geosciences, Idaho State Univ, Pocatello, ID 83209, JANECKE, Susanne U., Dept. of Geology, Utah State Univ, Logan, UT 84322-4505 and FANNING, C. Mark, Research School of Earth Sciences, The Australian National Univ, Canberra, ACT, 0200, Australia, linkpaul@isu.edu, linkpaul@isu.edu
11
11:40 AM
SYNCHRONOUS EXTENSION AND CONTRACTION IN THE ANACONDA METAMORPHIC COMPLEX
BERGER, Aaron L., ELLIOTT, Colleen G. and LORENSON, Gregory W., Geological Engineering, Montana Tech of the Univ of Montana, 1300 West Park Street, Butte, MT 59701, aberger@mtech.edu, aberger@mtech.edu
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