1989
DOI: 10.1139/e89-025
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Crustal structure and surface zonation of the Canadian Appalachians: implications of deep seismic reflection data

Abstract: In 1986, 1181 km of marine seismic reflection data was collected to 18–20 s of two-way traveltime in the Gulf of St. Lawrence area. The seismic profiles sample all major surface tectono-stratigraphic zones of the Canadian Appalachians. They complement the 1984 deep reflection survey northeast of Newfoundland. Together, the seismic profiles reveal the regional three-dimensional geometry of the orogen.Three lower crustal blocks are distinguished on the seismic data. They are referred to as the Grenville, Central… Show more

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Cited by 110 publications
(53 citation statements)
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“…The clastic rocks of the Gander Zone are thus autochthonous to parautochthonous with respect to their basement. The seismically defined lower crustal block underneath the Gander Zone (Marillier et al, 1989;Stockmal et al, 1990) thus probably represents its original basement. Quinlan et al (1992) recently argued on the basis of continuity of seismic reflectors that the lower crustal block is similar to the basement of the Hermitage Flexure (Bras d'Or-Brookville belt) in southwestern Newfoundland (Fig.…”
Section: Constraints On the Provenance Of Gander Zone Rocks In New Brmentioning
confidence: 99%
“…The clastic rocks of the Gander Zone are thus autochthonous to parautochthonous with respect to their basement. The seismically defined lower crustal block underneath the Gander Zone (Marillier et al, 1989;Stockmal et al, 1990) thus probably represents its original basement. Quinlan et al (1992) recently argued on the basis of continuity of seismic reflectors that the lower crustal block is similar to the basement of the Hermitage Flexure (Bras d'Or-Brookville belt) in southwestern Newfoundland (Fig.…”
Section: Constraints On the Provenance Of Gander Zone Rocks In New Brmentioning
confidence: 99%
“…1; Blackwood and Kennedy, 1975;Dallmeyer et al, 1981;Holdsworth, 1994) and is correlated at depth with a geophysically-defined crustal-scale structure that offsets the Moho (Keen et al, 1986;Marillier et al, 1989;Stockmal et al, 1990). Sinistral shear is recorded in a ~20 km wide NE-striking zone of ductile shear that parallels the Dover Fault, the Wing Pond shear zone ( Fig.…”
Section: Accepted M Manuscriptmentioning
confidence: 96%
“…1) and the Baie Verte line (Williams and St. Julien, 1978), respectively. Seismic reflection studies show that the entire Notre Dame subzone is allochthonous, underlain by the eastward-dipping extension of the ancient Laurentian continental margin (Marillier et al, 1989;Quinlan et al, 1992). Geologic data provide no evidence of the spatial relationships between the oceanic terranes and continental lithosphere during the Cambrian and Early Ordovician.…”
Section: Geologic Setting Of the Notre Dame Subzonementioning
confidence: 99%