Session No. 25 Friday, March 14, 2003

1:00 PM-4:00 PM, University of Memphis Conference Center: Fogelman Executive Center 215
Petrology and Structural Geology
Matthew I. Leybourne, Presiding
 Paper #Start Time
25-11:00 PM AN INVESTIGATION INTO THE MORPHOLOGY, PETROLOGY, AND GEOCHEMISTRY OF THE WEST ROTA CALDERA, MARIANA BACK-ARC BASIN: ROBERTSON, Katherine A.1, STERN, Robert J.1, LEYBOURNE, Matthew I.1, and BECKER, Nate2, (1) Department of Geosciences, Univ of Texas at Dallas, P.O. Box 830688, Richardson, TX 75083-0688, metalharp@yahoo.com, (2) SOEST, Univ of Hawaii
25-21:20 PM VARIATIONS IN ALKALI FELDSPAR/MELT TRACE-ELEMENT PARTITIONING DURING FRACTIONATION OF PERALKALIC QUARTZ TRACHYTE-RHYOLITE SUITES: WHITE, John Charles1, PARKER, Don F.2, and REN, Minghua2, (1) Department of Geological, Environmental, and Marine Sciences, Elizabeth City State Univ, Campus Box 971, 1704 Weeksville Road, Elizabeth City, NC 27909, rhyolite@adelphia.net, (2) Dept. of Geology, Baylor Univ, Waco, TX 76798-7354
25-31:40 PM A FIELD STUDY OF EOCENE INTRUSIVE ROCKS AND THEIR SURROUNDINGS IN HIGHLAND COUNTY, VIRGINIA: TSO, Jonathan L. and SURBER, John D., Department of Geology, Radford Univ, Box 6939, Radford, VA 24142, jtso@radford.edu
25-42:00 PM THE MIDWAY SILL, LLANO UPLIFT, CENTRAL TEXAS: TOWN MOUNTAIN GRANITE? NO: SMITH, R.K., BOYER, Ben, and GIBBS, Tyson, Department of Earth and Environmental Science, The University of Texas at San Antonio, San Antonio, TX 78249-0663, rsmith@utsa.edu
25-52:20 PM RECOGNITION OF MESOPROTEROZOIC DUCTILE SHEAR ALONG THE BLACK FAULT IN SOUTHEASTERN MISSOURI: LOWELL, Gary R., Geosciences, Southeast Missouri State Univ, Cape Girardeau, MO 63701, glowell@semovm.semo.edu and CLENDENIN, C.W., S. C. Department of Natural Resources, Geol Survey, 5 Geology Road, Columbia, SC 29212
25-62:40 PM A CLOSER LOOK AT PSEUDOTACHYLYTE FORMATION: MELT-GENERATING REACTIONS REVEALED BY OPTICAL AND ELECTRON MICROSCOPY: CREVIER, Jeffery M, Department of geological sciences, Univ of Kentucky, Lexington, KY 40503, jcrevier@earthlink.net and MOECHER, David P

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