Session: Continental Tectonics of Shield Regions (North-Central Section

Paper #

Start Time

8:25 AM

Introductory Remarks

1

8:30 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 and HOLM, Daniel K., Dept. of Geology, Kent State Univ, Kent, OH 44242, rvschmus@ku.edu, rvschmus@ku.edu

2

8:45 AM

RECENT INVESTIGATIONS OF THE PENOKEAN OROGEN IN MINNESOTA: A CASE FOR INDENTER TECTONICS ALONG A PROMONTORY-REENTRANT MARGIN

CHANDLER, Val W., Minnesota Geological Survey, Univ of Minnesota, 2609 Territorial Road, St. Paul, MN 55114, BOERBOOM, Terrence J., Minnesota Geological Survey, Univ of Minnesota, 2642 University Avenue, St. Paul, MN 55114-1057 and JIRSA, Mark A., chand004@umn.edu, chand004@umn.edu

3

9:00 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, 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, dholm@kent.edu, dholm@kent.edu

4

9:15 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, skalbeck@uwp.edu

5

9:30 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. Geological Survey, 954 National Center, Reston, VA 20192 and SCHNEIDER, David A., Geological Sciences, Ohio Univ, Clippinger Labs 316, Athens, OH 45701, kschulz@usgs.gov, kschulz@usgs.gov

6

9:45 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, (2)Department of Geology, Kent State Univ, Kent, OH 44242, schneidd@ohio.edu, schneidd@ohio.edu

10:00 AM

Break

7

10:15 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, bair0042@umn.edu

8

10:30 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, Craddock@Macalester.edu

9

10:45 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 and CZECK, Dyanna, Geosciences, Univ of Wisconsin, PO Box 413, Milwaukee, WI 53201, cormand@wittenberg.edu, cormand@wittenberg.edu

10

11:00 AM

PROTEROZOIC QUARTZITES AT HAMILTON MOUNDS, CENTRAL WISCONSIN: IMPLICATIONS FOR GEON 17 MAGMATISM, SEDIMENTATION, AND TECTONICS IN THE SOUTHERN LAKE SUPERIOR REGION

MEDARIS Jr, L.G. and DOTT Jr, R.H., Dept. of Geology and Geophysics, Univ of Wisconsin - Madison, Madison, WI 53706, medaris@geology.wisc.edu, medaris@geology.wisc.edu

11

11:15 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, (2)Geological Sciences, Ohio University, Athens, OH 45701, jloofbor@kent.edu, jloofbor@kent.edu

12

11:30 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, 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, jhnat@umich.edu, jhnat@umich.edu

11:45 AM

Concluding Remarks

North-Central Section - 39th Annual Meeting (May 19–20, 2005)

S1. Continental Tectonics of Shield Regions