CHRIS HOLM
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Department of Geological Sciences Florida State University 108 Carraway Building Tallahassee, FL 32306-4100 Office: 006 Carraway Phone: (805)644-3120 holm@gly.fsu.edu Personal Web Page Structure Lab (GLY 3400C) Field Camp-Taos, NM (GLY-4751) Physical Geology Lab (GLY-2010) Dynamic Earth Lab (GLY-1000) |
Current Research: The southeastern boundary of the southern western Blue Ridge and Northern Talladega belt in Georgia is the Allatoona fault, a terrane bounding fault formed very late in the kinematic sequence. This fault maintains a relatively straight trace for >110 km. On the Yorkville, Georgia 7.5 min. Quadrangle, however, reconnaissance mapping by the Georgia Geological Survey (McConnell and Abrams, 1984) indicates that the boundary between the Talladega belt and the eastern Blue Ridge terrane makes a sharp north-south jog into the eastern Blue Ridge, indenting the boundary ~10km. Plutonic rock referred to as Mulberry Rock Gneiss (MRG)occur within the structural recess, and have been suggested to be basement culminations (McConnell and Abrams, 1984).At least three working hypotheses are being tested by mapping the culminations and their cover sequences: 1) the MRG is Grenville basement lithologically dissimilar to other Blue Ridge basement culminations to the northeast, surrounded by cover rocks of the Talladega belt, 2) the MRG occurs within the eastern Blue Ridge terrane and represents a Paleozoic intrusion. This would imply that a previously unrecognized tectonic break bounds the MRG and its cover sequence to the northwest, with rocks of the Talladega belt. and 3) The Mulberry Rock Gneiss structural indentation or recess is a structural half-window or "eyelid window" where the hanging wall rocks of the eastern Blue Ridge as well as the terrane bounding fault are sharply folded into the recess .
Professional Information:
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Structural Geology
Tectonics
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