| Title | Evolution of the Appalachian Laurentian margin: Lithoprobe results in western Newfoundland |
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| Author | Waldron, J W F; Anderson, S D; Cawood, P A; Goodwin, L B; Hall, J; Jamieson, R A; Palmer, S E; Stockmal, G S ; Williams, P F |
| Source | Lithoprobe 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 |
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| Year | 1998 |
| Alt Series | Geological Survey of Canada, Contribution Series 1997292 |
| Alt Series | Lithoprobe Publication 913 |
| Alt Series | Publications of the Tectonics Special Research Centre 13 |
| Publisher | Canadian Science Publishing |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Newfoundland and Labrador |
| NTS | 1K; 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 |
| Area | Humber 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 |
| Subjects | general 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; Ordovician; Silurian; Devonian |
| Illustrations | location maps; cross-sections, structural; diagrams; cross-sections, stratigraphic; seismic reflection profiles |
| Program | Lithoprobe East |
| Program | NSERC Natural Sciences and Engineering Research Council of
Canada |
| Released | 1998 11 01 |
| Abstract | The 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 ID | 209349 |
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