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TitleEvolution of the Appalachian Laurentian margin: Lithoprobe results in western Newfoundland
 
AuthorWaldron, J W F; Anderson, S D; Cawood, P A; Goodwin, L B; Hall, J; Jamieson, R A; Palmer, S E; Stockmal, G SORCID logo; Williams, P F
SourceLithoprobe East transect/Le transect est du projet Lithoprobe; by Quinlan, G (ed.); Canadian Journal of Earth Sciences vol. 35, no. 11, 1998 p. 1271-1287, https://doi.org/10.1139/e98-053 Open Access logo Open Access
Image
Year1998
Alt SeriesGeological Survey of Canada, Contribution Series 1997292
Alt SeriesLithoprobe Publication 913
Alt SeriesPublications of the Tectonics Special Research Centre 13
PublisherCanadian Science Publishing
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceNewfoundland and Labrador
NTS1K; 1L; 1M; 1N; 2C; 2D; 2E; 2F; 2L; 2M; 10N; 10O; 20O; 20P; 11; 12; 21A; 21B; 21G; 21H; 21J; 21I; 21O; 21P; 22A; 22B; 22G; 22H; 22I; 22J; 22O; 22P
AreaHumber Zone; Appalachian; Baie Verte Peninsula; Gulf of St. Lawrence; Dunnage Zone; Port Au Port Peninsula
Lat/Long WENS -68.0000 -52.0000 52.0000 43.0000
Lat/Long WENS -60.0000 -55.2500 52.2500 47.4167
Subjectsgeneral geology; igneous and metamorphic petrology; mineralogy; structural geology; tectonics; rifting; plate margins; subsidence; seismic reflection surveys; seismic data; orogenies; shear zones; plate tectonics; eclogites; metamorphism; faults, thrust; seismic interpretations; Taconian deformation; seismic reflection profiles; Barrovian metamorphism; transpression; transtension; Ordovician; Silurian; Devonian
Illustrationslocation maps; cross-sections, structural; diagrams; cross-sections, stratigraphic; seismic reflection profiles
ProgramLithoprobe East
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
AbstractThe Humber Zone of the western Newfoundland Appalachians represents the early Paleozoic Laurentian margin established by Neoproterozoic rifting. After a period of passive margin thermal subsidence, Taconian deformation began in the Early Ordovician with westward thrusting. Subsequently, an extensive foreland basin developed beneath the Gulf of St. Lawrence. It records rapid Late Ordovician to Early Silurian subsidence; mid-Silurian erosion; and renewed Late Silurian to Devonian subsidence. The Humber Zone was traversed by Lithoprobe seismic reflection profiles. Within the external part of the orogen, seismic reflections in the upper crustal section appear more coherent where seismic lines are parallel to fold hinges. Some subhorizontal reflectors are interpreted as thrust sheets of shelf limestone, but others probably represent intrabasement structures. A group of moderately northwest-dipping reflections probably represents late extensional shear zones. On the Baie Verte Peninsula, low-angle reflections passing beneath the Baie Verte Line are probably also late extensional shears, possibly reactivating earlier thrusts. Tectonism in the Humber Zone probably began with attempted eastward subduction of the Laurentian margin. Deep burial of the margin, accompanied by eclogite-facies metamorphism, probably coincided with rapid subsidence in the foreland basin. Later Barrovian metamorphism was associated with cleavage development and east-directed shear, and with dextral oblique slip, in Baie Verte Peninsula. Later Silurian sinistral transpression with thrusting east of the Baie Verte Line was followed by dextral transpression to transtension. "Acadian" thrusting dominated the western margin of the orogen in the Devonian and possibly earliest Carboniferous.
GEOSCAN ID209349

 
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