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Geology; March 2003; v. 31; no. 3; p. 215-218; DOI: 10.1130/0091-7613(2003)031<0215:SRAASA>2.0.CO;2
© 2003 Geological Society of America
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Smith River allochthon: A southern Appalachian peri-Gondwanan terrane emplaced directly on Laurentia?

James P. Hibbard*,1, Robert J. Tracy2 and William S. Henika*,3

1 Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina 27695, USA
2 Department of Geological Sciences, Virginia Polytechnic Institute and State College, Blacksburg, Virginia 24061, USA
3 Virginia Division of Mines, Minerals, and Energy, Department of Geological Sciences, Virginia Polytechnic Institute and State College, Blacksburg, Virginia 24061, USA

The Smith River allochthon is in a southern Appalachian belt of metaclastic rocks that has traditionally been considered to be of peri-Laurentian origin. New Th-U-Pb monazite ages confirm that the allochthon was involved in an Early Cambrian tectonothermal event, indicate that it was exotic with respect to adjacent Laurentian rocks, and indicate that it is likely of Gondwanan origin. The allochthon may form a new link between the Appalachians and the Pampean terrane of western South America; in addition, its position in the orogen has implications for recent models of the opening of the Iapetus.

Key Words: southern Appalachians • peri-Gondwanan terranes • monazite ages • Cambrian tectonothermal event • Pampean terrane




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