Lithoprobe east: marine deep seismic reflection results across the Appalachians and the rifted continental margin northeast of Newfoundland
Marine deep seismic reflection data have been collected across the Appalachian Orogen and the rifted continental margin northeast of Newfoundland. Results across the Appalachian Orogen show the extent of the ancient Grenvillian passive margin beneath the terranes to the east, the nature of terrane boundaries at depth, and the relationships between surface geological features and the seismically defined crustal geometry. The results across the rifted margin define a decollement zone below the faulted continental basement. These basement fault blocks do not exhibit a listric geometry. The continental crust thins beneath the sedimentary basins occupying the rifted margin, although there does not appear to be a simple relationship between crustal thickness and basin subsidence. The ocean-continent transition is marked by a landward dip of the oceanic crust which disappears below the thinned continental crust near the transition. The ocean-continent boundary is not a vertical boundary between crustal types, rather there appears to be continuity of oceanic-type crust below the continent, perhaps forming a high velocity lower crustal layer across the continental margin.
- Research Organization:
- Bedford Institute of Oceanography, Dartmouth, Nova Scotia (Canada)
- OSTI ID:
- 6319726
- Report Number(s):
- CONF-8510489-
- Journal Information:
- Geol. Soc. Am., Abstr. Programs; (United States), Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Vol. 17; ISSN GAAPB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580201* -- Geophysics-- Seismology & Tectonics-- (1980-1989)
APPALACHIAN MOUNTAINS
BASEMENT ROCK
CANADA
CONTINENTAL CRUST
CONTINENTAL MARGIN
CORRELATIONS
EARTH CRUST
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOMETRY
GEOPHYSICAL SURVEYS
ISLANDS
MAPPING
MATHEMATICS
MOUNTAINS
NEWFOUNDLAND
NORTH AMERICA
OCEANIC CRUST
PLATE TECTONICS
RIFT ZONES
SEISMIC SURVEYS
SURVEYS
TECTONICS