North-Central Section - 39th Annual Meeting (May 19–20, 2005)
Session No. 2 Thursday, 19 May 2005
8:25 AM-11:50 PM, Radisson Metrodome: University C Ballroom

S1. Continental Tectonics of Shield Regions

Daniel K. Holm and David A. Schneider, Presiding
 Paper #Start Time
 8:25 AM Introductory Remarks
2-18:30 AM ARCHEAN-PALEOPROTEROZOIC TRANSITION IN THE NORTHERN UNITED STATES: VAN SCHMUS, W.R., Dept. of Geology, Univ of Kansas, 120 Lindley Hall, 1475 Jayhawk Blvd, Lawrence, KS 66045-7613, rvschmus@ku.edu and HOLM, Daniel K., Dept. of Geology, Kent State Univ, Kent, OH 44242
2-28:45 AM RECENT INVESTIGATIONS OF THE PENOKEAN OROGEN IN MINNESOTA: A CASE FOR INDENTER TECTONICS ALONG A PROMONTORY-REENTRANT MARGIN: CHANDLER, Val W., BOERBOOM, Terrence J., and JIRSA, Mark A., Minnesota Geological Survey, Univ of Minnesota, 2642 University Avenue, St. Paul, MN 55114-1057, chand004@umn.edu
2-39:00 AM THE MCGRATH GNEISS DOME AND MALMO STRUCTURAL DISCONTINUITY IN E-C MINNESOTA: LINKED EXHUMATION STRUCTURES FORMED DURING COLLAPSE OF THE WESTERN PENOKEAN OROGEN: HOLM, Daniel K., Geology, Kent State Univ, Kent, OH 44242, dholm@kent.edu, BOERBOOM, Terry, Minnesota Geol Survey, 2642 University Ave, St. Paul, MN 55114, and SCHNEIDER, David A., Geological Sciences, Ohio Univ, Clippinger Labs 316, Athens, OH 45701
2-49:15 AM MODELING OF GRAVITY AND AEROMAGNETIC DATA TO ESTIMATE PRECAMBRIAN BASEMENT TOPOGRAPHY IN SOUTHEASTERN WISCONSIN: SKALBECK, John D., HELGESEN, Ryan S., and SWOSINSKI, Daniel S., Department of Geosciences, Univ of Wisconsin-Parkside, 900 Wood Road, Kenosha, WI 53141, skalbeck@uwp.edu
2-59:30 AM AGE CONSTRAINTS ON THE PALEOPROTEROZOIC PEMBINE OPHIOLITE-ISLAND ARC COMPLEX AND IMPLICATIONS FOR THE EVOLUTION OF THE PENOKEAN OROGEN: SCHULZ, Klaus J., U.S. Geol Survey, 954 National Center, Reston, VA 20192, kschulz@usgs.gov and SCHNEIDER, David A., Geological Sciences, Ohio Univ, Clippinger Labs 316, Athens, OH 45701
2-69:45 AM NEWLY RECOGNIZED PALEOPROTEROZOIC MAFIC MAGMATISM, CENTRAL PENOKEAN OROGEN (WISCONSIN): SCHNEIDER, D.A.1, HOLM, D.K.2, and LOOFBORO, J.2, (1) Geological Sciences, Ohio University, Clippinger Laboratory 316, Athens, OH 45701, schneidd@ohio.edu, (2) Department of Geology, Kent State Univ, Kent, OH 44242
 10:00 AM Break
2-710:15 AM CHEMISTRY VARIATIONS AND VOLUME LOSS IN MESO-SCALE DUCTILE SHEAR ZONES: EXAMPLE FROM THE NORTHWEST ADIRONDACKS, NEW YORK: BAIRD, Graham B., Department of Geology and Geophysics, Univ of Minnesota, 310 Pillsbury Drive SE, Minneapolis, MN 55455, bair0042@umn.edu
2-810:30 AM PROGRESSIVE DEFORMATION IN MIDCONTINENTAL MINNESOTA FROM THE PENOKEAN (1.8 GA) THROUGH LARAMIDE OROGENS (~50 MA): CRADDOCK, John P. and JUDA, Natalie A., Geology, Macalester College, 1600 Grand Ave, Saint Paul, MN 55105-1801, Craddock@Macalester.edu
2-910:45 AM CLEAVAGE REFRACTION AS A MEASURE OF VISCOSITY CONTRAST: NEW INSIGHTS FROM THE BARABOO SYNCLINE: ORMAND, Carol J., Department of Geology, Wittenberg Univ, Springfield, OH 45501, cormand@wittenberg.edu and CZECK, Dyanna, Geosciences, Univ of Wisconsin, PO Box 413, Milwaukee, WI 53201
2-1011:00 AM PROTEROZOIC QUARTZITES AT HAMILTON MOUNDS, CENTRAL WISCONSIN: IMPLICATIONS FOR GEON 17 MAGMATISM, SEDIMENTATION, AND TECTONICS IN THE SOUTHERN LAKE SUPERIOR REGION: MEDARIS, L.G. Jr and DOTT, R.H. Jr, Dept. of Geology and Geophysics, Univ of Wisconsin - Madison, Madison, WI 53706, medaris@geology.wisc.edu
2-1111:15 AM IMPLICATIONS OF DETRITAL AND METAMORPHIC MONAZITE AGE DATA FROM PROTEROZOIC QUARTZITES AND BASEMENT IN CENTRAL WISCONSIN: LOOFBORO, Jeff1, HOLM, Daniel K.1, and SCHNEIDER, David2, (1) Geology, Kent State Univ, Kent, OH 44242, jloofbor@kent.edu, (2) Geological Sciences, Ohio University, Athens, OH 45701
2-1211:30 AM ORIGIN OF CURVATURE IN THE MID-CONTINENT RIFT: PALEOMAGNETISM OF THE PORTAGE LAKE VOLCANICS IN MICHIGAN’S KEWEENAW PENINSULA: HNAT, James S., Geological Sciences, Univ of Michigan, 425 East University, 2534 CC Little, Ann Arbor, MI 48109, jhnat@umich.edu, VAN DER PLUIJM, Ben, Geological Sciences, Univ of Michigan, 2534 CC Little Building, Ann Arbor, MI 48109-1063, and VAN DER VOO, Rob, Geological Sciences, Univ of Michigan, Ann Arbor, MI 48109
 11:45 AM Concluding Remarks

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