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Geology; July 2003; v. 31; no. 7; p. 609-612; DOI: 10.1130/0091-7613(2003)031<0609:SISATU>2.0.CO;2
© 2003 Geological Society of America
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Sequential intercontinental suturing as the ultimate control for Pennsylvanian Ancestral Rocky Mountains deformation

William R. Dickinson*,1 and Timothy F. Lawton*,1

1 Department of Geosciences, Box 210077, University of Arizona, Tucson, Arizona 85721, USA
2 Department of Geological Sciences, Box 3AB, New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003-8001, USA

The geotectonic setting of Pennsylvanian uplifts and associated basins of the Ancestral Rocky Mountains province has long been unclear because analogy of the deformed intracontinental domain with either arc or collisional orogens is not apt. Diachronous subsidence of Ancestral Rocky Mountains basins was coincident with sequential closure, from east to west, of the Ouachita suture to the southeast. This geotectonic relationship suggests that Ancestral Rocky Mountains deformation was induced by intracontinental stresses associated with continued subduction of westerly parts of Laurentia after more easterly parts had locked against Gondwana.

Key Words: Ancestral Rocky Mountains • Pennsylvanian • Ouachita • suture belt • tectonism




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