Session: Active and Ancient Tectonics along the Northern Cordillera Margin—Magmatism, Deformation, Metamorphism, and Basin Development (Posters) (2007 GSA Denver Annual Meeting (28

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159

DETRITAL ZIRCON U-PB ANALYSIS OF PRE-MISSISSIPPIAN METASEDIMENTARY BASEMENT STRATA, NORTH SLOPE, ALASKA: EVIDENCE OF A CALEDONIAN CONNECTION

MOORE, Thomas E., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, POTTER, Christopher J., U.S. Geological Survey, Mail Stop 939, Denver Federal Center, Denver, CO 80225-0046 and O'SULLIVAN, Paul B., Apatite to Zircon, Inc, 1075 Matson Rd, Viola, ID 83872-9709, tmoore@usgs.gov, tmoore@usgs.gov

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160

GEOLOGIC SYNTHESIS OF THE METAMORPHIC CORE OF THE BROOKS RANGE OROGEN, ALASKA

TILL, Alison B., USGS, 4200 University Drive, Anchorage, AK 99508, DUMOULIN, J.a., N/a, U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508, HARRIS, Anita G., U.S. Geological Survey, Emeritus, Deerfield Beach, FL 33441, MOORE, Thomas E., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 and BLEICK, Heather A., USGS, 4200 University Dr, Anchorage, AK 99508, atill@usgs.gov, atill@usgs.gov

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161

GEOCHEMICAL AND ND-PB ISOTOPIC EVOLUTION OF METABASITES FROM ATTENUATED CONTINENTAL LITHOSPHERE, NOME GROUP, SEWARD PENINSULA, ALASKA

AYUSO, Robert A., 954 National Center, U.S. Geological Survey, Reston, VA 20192 and TILL, Alison B., USGS, Anchorage, AK 99508, rayuso@usgs.gov, rayuso@usgs.gov

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162

SANDSTONE PETROGRAPHY, FOSSILS, AND DETRITAL ZIRCON AGES DISTINGUISH PROVENANCE IN THE TIKCHIK LAKES AREA, SOUTHWEST ALASKA

KARL, Susan M., US Geological Survey, 4200 University Dr, Anchorage, AK 99508, BOX, Stephen E., USGS, 904 W. Riverside Ave, Room 202, Spokane, WA 99201 and FRIEDMAN, Richard M., Dept. Earth and Ocean Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T1Z4, Canada, skarl@usgs.gov, skarl@usgs.gov

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163

NEW CONSTRAINTS ON THE ORIGIN OF THE TIKCHIK TERRANE, SOUTHWESTERN ALASKA

BOX, Stephen E., USGS, 904 W. Riverside Ave, Room 202, Spokane, WA 99201, KARL, Susan M., USGS, 4210 University Dr, Anchorage, AK 99508-4626 and FRIEDMAN, Richard M., Pacific Centre for Isotopic and Geochemical Research, Univ of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4, Canada, sbox@usgs.gov, sbox@usgs.gov

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164

DETRITAL ZIRCON GEOCHRONOLOGY OF THE UPPER CRETACEOUS KUSKOKWIM GROUP, SOUTHWESTERN ALASKA

MILLER, Marti L., Alaska Science Center, U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, BRADLEY, Dwight, USGS, 4200 University Dr, Anchorage, AK 99508, KALBAS, James L., ExxonMobil Development Company, Houston, TX 77381, FRIEDMAN, Richard, Earth and Ocean Sciences, The Univ of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 and O'SULLIVAN, Paul B., Apatite to Zircon, Inc, 1075 Matson Rd, Viola, ID 83872-9709, mlmiller@usgs.gov, mlmiller@usgs.gov

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165

MULTI-STAGE CRETACEOUS BASIN DEVELOPMENT IN SOUTHWESTERN ALASKA: MARINE DEPOSITIONAL RESPONSES DURING SYN- TO EARLY POST-COLLISION (?) MARGIN EVOLUTION

KALBAS, James L., ExxonMobil Development Company, Houston, TX 77381, RIDGWAY, Kenneth D., Dept. of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907-2051, MILLER, Marti L., U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667 and BRADLEY, Dwight C., U.S. Geological Survey, 4200 University Dr, Anchorage, AK 99508-4667, jay.l.kalbas@exxonmobil.com, jay.l.kalbas@exxonmobil.com

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166

STRATIGRAPHY, GEOCHRONOLOGY, GEOCHEMISTRY, AND PALEONTOLOGY OF THE MCCARTHY FORMATION, WRANGELL MOUNTAINS, ALASKA: BEARINGS ON PRE-COLLISION CRUSTAL CONDITIONS WITHIN THE WRANGELLIA TERRANE

WITMER, John¹, TROP, Jeffrey¹, RIOUX, Matthew², PÁLFY, József³ and BLODGETT, Robert B.⁴, (1)Dept. of Geology, Bucknell University, Lewisburg, PA 17837, (2)Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, (3)Hungarian Academy of Sciences, Hungarian Natural History Museum, Budapest, H-1431, Hungary, (4)U.S. Geological Survey - Contractor, 4200 University Drive, Anchorage, AK 99508, jwitmer@bucknell.edu, jwitmer@bucknell.edu

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167

UPDATES TO THE LATE PALEOZOIC HISTORY OF THE ALEXANDER TERRANE

KATVALA, Erik Cowing, Geology and Geophysics, University of Calgary, 2500 University Drive, NW, Calgary, AB T2N 1N4, Canada and HENDERSON, Charles, Geology and Geophysics, Univ of Calgary, Calgary, AB T2N 1N4, Canada, erik@croatoan.org, erik@croatoan.org

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168

DETRITAL ZIRCON AGES FROM METASEDIMENTS IN THE FORTYMILE DISTRICT, EAST CENTRAL ALASKA

VAN WYCK, Nicholas, Sisyphus Consulting, 3705 Arctic Blvd. #1150, Anchorage, AK 99503, nvw@sisyphus-consulting.com, nvw@sisyphus-consulting.com

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169

PALEOGEOGRAPHY OF THE DEVONIAN WOODCHOPPER VOLCANICS, YUKON-CHARLEY RIVERS NATIONAL PRESERVE, EAST-CENTRAL ALASKA

ROHR, David M., Earth & Physical Sciences, Sul Ross State University, 400 N. Harrison Street, Alpine, TX 79832, BLODGETT, Robert B., US Geological Survey - Contractor, 4200 University Drive, Anchorage, AK 99508 and BECKSTEAD, Douglas, National Park Service, Fairbanks, AK 99701, rblodgett@usgs.gov, rblodgett@usgs.gov

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170

REVISITING THE PALEOMAGNETISM OF A PALEOCENE TRENCH-RIDGE-TRENCH TRIPLE JUNCTION; KODIAK ISLANDS, ALASKA

O'CONNELL, Kristin, Science Education Resource Center, Carleton College, Northfield, MN 55057, HOUSEN, Bernard, Bellingham, WA 98225 and ROESKE, Sarah, Davis, CA 95616, koconnell@carleton.edu, koconnell@carleton.edu

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171

THERMOCHRONOLOGIC CONSTRAINTS ON THE UPLIFT AND FORMATION OF DENALI MOUNT MCKINLEY, CENTRAL ALASKA BASED ON APATITE U-TH/HE DATING

PERRY, S.E. and FITZGERALD, P.G., Earth Sciences, Syracuse University, Syracuse, NY 13444, seperr01@syr.edu, seperr01@syr.edu

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172

VARIABLE EXHUMATION ALONG THE STRIKE OF THE ALASKA RANGE

BENOWITZ, Jeff, Geology and Geophysics, University of Alaska Fairbanks, Fairbanks, AK 99775, PERRY, Stephanie, Department of Earth Sciences, Syracuse University, 204 Heroy Geology Laboratory, Syracuse, NY 13244, LAYER, Paul, College of Natural Science and Mathematics, Univ of Alaska Fairbanks, PO 755780, Fairbanks, AK 99775 and FITZGERALD, Paul, Syracuse Univ, Syracuse, NY 13244-1070, jbenowitz@alaska.edu, jbenowitz@alaska.edu

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173

MIOCENE INTRA-ARC BASIN DEVELOPMENT WITHIN THE WRANGELL VOLCANIC FIELD, FREDERIKA FORMATION AND LOWER WRANGELL LAVA, EASTERN WRANGELL MOUNTAINS, ALASKA

TROP, Jeffrey¹, SNYDER, Darin², HART, William³, IDLEMAN, Bruce⁴ and DELANEY, M. Ryan¹, (1)Dept. of Geology, Bucknell University, Lewisburg, PA 17837, (2)Dept. of Geology, Miami University, Oxford, OH 45056, (3)Department of Geology and Environmental Earth Science, Miami University, Oxford, OH 45056, (4)Dept of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, jtrop@bucknell.edu, jtrop@bucknell.edu

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174

MIOCENE AND PLIOCENE SEDIMENTARY FOOTPRINT OF FLAT-SLAB SUBDUCTION OF THE YAKUTAT TERRANE, SOUTHERN ALASKA

FINZEL, Emily S.¹, RIDGWAY, Kenneth¹, BRENNAN, Patrick² and LANDIS, Paul³, (1)Department of Earth and Atmospheric Sciences, Purdue University, 500 Stadium Mall Drive, West Lafayette, IN 47907, (2)Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, (3)Chevron North America Exploration and Production Company, 1500 Louisiana Street, Houston, TX 77002, efinzel@purdue.edu, efinzel@purdue.edu

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175

NEW INSIGHTS INTO THE ORIGIN AND DISPLACEMENT HISTORY OF THE YAKUTAT TERRANE, SOUTHEASTERN ALASKA

LANDIS, Paul¹, RIDGWAY, Kenneth¹, BRENNAN, Patrick² and GEHRELS, George E.³, (1)Department of Earth and Atmospheric Sciences, Purdue University, 500 Stadium Mall Drive, West Lafayette, IN 47907, (2)Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, (3)Department of Geosciences, University of Arizona, Tucson, AZ 85721, plandis@purdue.edu, plandis@purdue.edu

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176

TRANSPORT STRATIGRAPHY OF THE YAKUTAT TERRANE, SOUTHERN ALASKA BASED ON DETRITAL ZIRCON FISSION-TRACK AND U/PB ANALYSIS

PERRY, S.E., Earth Sciences, Syracuse University, Syracuse, NY 13444, GARVER, J.I., Geology, Union College, Olin Building, Schenectady, NY 12308 and RIDGWAY, K.D., Earth & Atmospheric Sciences, Purdue Univ, 1397 Civil Engineering Bldg, West Lafayette, IN 47907-1397, seperr01@syr.edu, seperr01@syr.edu

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177

DO ALONG-STRIKE CHANGES IN SUBDUCTION PLATE GEOMETRY INFLUENCE INTRACONTINENTAL STRESS LOCALIZATION? NUMERICAL MODELS OF THE PACIFIC-YAKUTAT-CENTRAL ALASKA PLATE BOUNDARY

WILLIS, Julie B., Geology, BYU-Idaho, 525 South Center, Rexburg, ID 83460 and BRUHN, Ronald L., Dept. of Geology and Geophysics, Univeristy of Utah, 135 S 1460 E, Rm 719, Salt Lake City, UT 84112, willisj@byui.edu, willisj@byui.edu

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178

ACTIVE TECTONICS OF THE WESTERN ST. ELIAS SYNTAXIS

PAVLIS, Terry, Geological Sciences, University of Texas at El Paso, El Paso, TX 79968, CHAPMAN V, James B., Geosciences, University of Arizona, 1040 E. 4th St, Tucson, AZ 79968, VORKINK, M., Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, BRUHN, Ronald L., Geology and Geophysics, Univ of Utah, 135 S 1460 E RM 716, Salt Lake City, UT 84112-0111 and RIDGWAY, Kenneth, Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, tlpavlis@utep.edu, tlpavlis@utep.edu

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179

USING LIDAR TO DISTINGUISH BETWEEN COMPETING MODELS OF TERRANE ACCRETION IN THE WESTERN SEGMENT OF THE SAINT ELIAS OROGEN, ALASKA

VORKINK, Mike, Department of Geology and Geophysics, University of Utah, 135 South 1460 East, Browning Building - Room 719, Salt Lake City, UT 84112, BRUHN, Ron, Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, PAVLIS, Terry, Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79902, MCALPIN, Jim, GeoHaz Consulting, Crestone, CO 81131 and CHAPMAN, Jay, Department of Geological Sciences, UTEP, El Paso, 79902, m.vorkink@utah.edu, m.vorkink@utah.edu

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180

ARCHITECTURE, KINEMATICS, AND EXHUMATION OF A GLACIATED OROGENIC WEDGE: THE CENTRAL ST. ELIAS OROGEN, ALASKA

SPOTILA, James A., Geological Sciences, Virginia Polytechnic Institute and State Univ, 4064 Derring Hall, Blacksburg, VA 24061, BERGER, Aaron L., Geological Sciences, Virginia Polytechnic Institute and State University, 4044 Derring Hall, Blacksburg, VA 24061, CHAPMAN, Jay, Department of Geological Sciences, UTEP, El Paso, 79902, PAVLIS, Terry, Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79902 and ENKELMANN, Eva, Earth and Environmental Science, Lehigh University, 31 Williams Dr, Bethlehem, PA 18015, spotila@vt.edu, spotila@vt.edu

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181

TECTONICS AND STRUCTURAL EVOLUTION OF THE EASTERN ST. ELIAS SYNTAXIS, ALASKA

CHAPMAN, James B., Geological Sciences, University of Texas, El Paso, 500 W. University Ave, El Paso, TX 79968, PAVLIS, Terry, Geological Sciences, University of Texas at El Paso, El Paso, TX 79968, BARKER, Adam, Bryand global sciences center, Orono, ME 04469, HEADLEY, Rachel, Johnson Hall 070 Box 351310, 4000 15th Avenue NE, Seattle, WA 98195, RIDGWAY, Kenneth, Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, BERGER, Aaron L., Geological Sciences, Virginia Polytechnic Institute and State University, 4044 Derring Hall, Blacksburg, VA 24061, SPOTILA, James, Geosciences, Virginia Tech, 4044 Derring Hall, Blacksburg, VA 24060, VORKINK, Michael, Geology and Geophysics, University of Utah, Salt Lake City, UT 84112 and BRUHN, Ronald L., Geology and Geophysics, Univ of Utah, 135 S 1460 E RM 716, Salt Lake City, UT 84112-0111, jbchapman@miners.utep.edu, jbchapman@miners.utep.edu

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182

KYANITE AFTER ANDALUSITE IN THE CONTACT AUREOLE OF AN EPIDOTE-BEARING PLUTON NEAR PETERSBURG, ALASKA: CONFIRMATION OF RAPID TECTONIC BURIAL IN SOUTHEAST ALASKA?

DETTINGER, Matthew¹, COLWELL, Lauren², KRISHNAN, Sonya², MACKEY, Tyler² and DAVIDSON, C.², (1)Department of Geosciences, University of Arizona, Gould-SimpsonBuilding #77, 1040 E 4th St, Tucson, AZ 85721, (2)Department of Geology, Carleton College, One North College St, Northfield, MN 55057, dettingm@carleton.edu, dettingm@carleton.edu

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183

STRUCTURE AND TECTONIC EVOLUTION OF THE BELT BASIN, MONTANA/IDAHO FROM GEOPHYSICAL CONSTRAINTS

BEDROSIAN, Paul A., US Geological Survey, Denver Federal Center, Bldg 20, MS 964, Denver, CO 80225, BOX, Stephen E., USGS, 904 W. Riverside Ave, Room 202, Spokane, WA 99201 and PELLERIN, Louise, Green Engineering Inc, Anchorage, AK 99507-3668, pbedrosian@usgs.gov, pbedrosian@usgs.gov

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184

OXYGEN ISOTOPE RATIOS OF REFRACTORY MINERAL PHASES FROM LARAMIDE-RELATED TERTIARY INTRUSIONS OF THE BLACK HILLS, SOUTH DAKOTA

KING, E.M.¹, MEISTER, P.A.¹, SPICUZZA, M.J.² and VALLEY, J.W.³, (1)Geography-Geology, Illinois State University, Campus Box 4400, Normal, IL 61790, (2)Geoscience, University of Wisconsin, 1215 West Dayton Street, Madison, WI 53706, (3)Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, WI 53706, emking@ilstu.edu, emking@ilstu.edu

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185

ROLES OF SLAB WINDOW MIGRATION, FAULT GEOMETRY AND TECTONIC WEDGING IN CRUSTAL EVOLUTION EAST OF THE NORTHERN SAN ANDREAS FAULT

MCLAUGHLIN, Robert J.¹, JACHENS, Robert C.¹, LANGENHEIM, Victoria¹, FLECK, Robert J.², SARNA-WOJCICKI, Andrei M.¹, EVANS, William C.¹ and DAVISSON, M. Lee³, (1)U. S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, (2)U. S. Geological Survey, 345 Middlefield Road, MS 937, Menlo Park, CA 94025, (3)Environmental Science Division, Lawrence Livermore National Lab, P.O. Box 808 L-396, Livermore, CA 94550, rjmcl@usgs.gov, rjmcl@usgs.gov

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186

FORMATION AGE AND MAGMA SOURCES FOR THE ANTIOQUEÑO BATHOLITH DERIVED FROM LA-ICP-MS URANIUM–LEAD DATING AND HAFNIUM-ISOTOPE ANALYSIS OF ZIRCON GRAINS

RESTREPO-MORENO, Sergio A., Department of Geological Sciences, University of Florida, PO Box 112120, Gainesville, FL 32611, FOSTER, David A., Department of Geological Sciences, University of Florida, PO Box 112120, Gainesvile, FL 32611 and KAMENOV, G.D., Department of Geological Sciences, University of Florida, Gainesville, FL 32611, sergiorm@ufl.edu, sergiorm@ufl.edu

2007 GSA Denver Annual Meeting (28–31 October 2007)

T84. Active and Ancient Tectonics along the Northern Cordillera Margin—Magmatism, Deformation, Metamorphism, and Basin Development (Posters)