Lithoprobe east: marine deep seismic reflection results across the Appalachians and the rifted continental margin northeast of Newfoundland

Conference · Tue Jan 01 00:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6319726

Keen, C E; Stockmal, G S; O'Brien, S J; Quinlan, G

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), Vol. 17; Conference: 98. annual meeting of the Geological Society of America, Orlando, FL, USA, 28 Oct 1985
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
APPALACHIAN MOUNTAINS
PLATE TECTONICS
SEISMIC SURVEYS
CONTINENTAL MARGIN
NEWFOUNDLAND
BASEMENT ROCK
CONTINENTAL CRUST
CORRELATIONS
GEOLOGIC FAULTS
GEOMETRY
MAPPING
OCEANIC CRUST
RIFT ZONES
CANADA
EARTH CRUST
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
ISLANDS
MATHEMATICS
MOUNTAINS
NORTH AMERICA
SURVEYS
TECTONICS
580201* - Geophysics- Seismology & Tectonics- (1980-1989)