Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland
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...
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1998
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/668a22ff-5f6d-45bd-8fb3-fe21f30ca4d7 2024-06-23T07:54:45+00:00 Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland Waldron, J W F Anderson, S D Cawood, Peter Anthony Goodwin, L B Hall, J Jamieson, R A Palmer, S E Stockmal, C S Williams, P F 1998-11 https://research-portal.st-andrews.ac.uk/en/researchoutput/evolution-of-the-appalachian-laurentian-margin-lithoprobe-results-in-western-newfoundland(668a22ff-5f6d-45bd-8fb3-fe21f30ca4d7).html http://www.scopus.com/inward/record.url?scp=0032322825&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/evolution-of-the-appalachian-laurentian-margin-lithoprobe-results-in-western-newfoundland(668a22ff-5f6d-45bd-8fb3-fe21f30ca4d7).html info:eu-repo/semantics/restrictedAccess Waldron , J W F , Anderson , S D , Cawood , P A , Goodwin , L B , Hall , J , Jamieson , R A , Palmer , S E , Stockmal , C S & Williams , P F 1998 , ' Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland ' , Canadian Journal of Earth Sciences , vol. 35 , no. 11 , pp. 1271-1287 . AU-PORT PENINSULA SEISMIC-REFLECTION PROFILE HUMBER ARM ALLOCHTHON LONG-RANGE DIKES TABLE HEAD GROUP U-PB ZIRCON MIDDLE ORDOVICIAN NORTHERN APPALACHIANS ISLANDS OPHIOLITE CANADIAN APPALACHIANS article 1998 ftunstandrewcris 2024-06-13T00:28:13Z 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 Bale Verte Peninsula, low-angle reflections passing beneath the Bale 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 Pale Verte Peninsula. Later Silurian sinistral transpression with thrusting east of the Bale 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. Article in Journal/Newspaper Newfoundland University of St Andrews: Research Portal Table Head ENVELOPE(-55.698,-55.698,52.083,52.083) Verte ENVELOPE(141.192,141.192,-66.740,-66.740) |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
AU-PORT PENINSULA SEISMIC-REFLECTION PROFILE HUMBER ARM ALLOCHTHON LONG-RANGE DIKES TABLE HEAD GROUP U-PB ZIRCON MIDDLE ORDOVICIAN NORTHERN APPALACHIANS ISLANDS OPHIOLITE CANADIAN APPALACHIANS |
spellingShingle |
AU-PORT PENINSULA SEISMIC-REFLECTION PROFILE HUMBER ARM ALLOCHTHON LONG-RANGE DIKES TABLE HEAD GROUP U-PB ZIRCON MIDDLE ORDOVICIAN NORTHERN APPALACHIANS ISLANDS OPHIOLITE CANADIAN APPALACHIANS Waldron, J W F Anderson, S D Cawood, Peter Anthony Goodwin, L B Hall, J Jamieson, R A Palmer, S E Stockmal, C S Williams, P F Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland |
topic_facet |
AU-PORT PENINSULA SEISMIC-REFLECTION PROFILE HUMBER ARM ALLOCHTHON LONG-RANGE DIKES TABLE HEAD GROUP U-PB ZIRCON MIDDLE ORDOVICIAN NORTHERN APPALACHIANS ISLANDS OPHIOLITE CANADIAN APPALACHIANS |
description |
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 Bale Verte Peninsula, low-angle reflections passing beneath the Bale 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 Pale Verte Peninsula. Later Silurian sinistral transpression with thrusting east of the Bale 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. |
format |
Article in Journal/Newspaper |
author |
Waldron, J W F Anderson, S D Cawood, Peter Anthony Goodwin, L B Hall, J Jamieson, R A Palmer, S E Stockmal, C S Williams, P F |
author_facet |
Waldron, J W F Anderson, S D Cawood, Peter Anthony Goodwin, L B Hall, J Jamieson, R A Palmer, S E Stockmal, C S Williams, P F |
author_sort |
Waldron, J W F |
title |
Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland |
title_short |
Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland |
title_full |
Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland |
title_fullStr |
Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland |
title_full_unstemmed |
Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland |
title_sort |
evolution of the appalachian laurentian margin: lithoprobe results in western newfoundland |
publishDate |
1998 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/evolution-of-the-appalachian-laurentian-margin-lithoprobe-results-in-western-newfoundland(668a22ff-5f6d-45bd-8fb3-fe21f30ca4d7).html http://www.scopus.com/inward/record.url?scp=0032322825&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-55.698,-55.698,52.083,52.083) ENVELOPE(141.192,141.192,-66.740,-66.740) |
geographic |
Table Head Verte |
geographic_facet |
Table Head Verte |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Waldron , J W F , Anderson , S D , Cawood , P A , Goodwin , L B , Hall , J , Jamieson , R A , Palmer , S E , Stockmal , C S & Williams , P F 1998 , ' Evolution of the Appalachian laurentian margin: Lithoprobe results in western Newfoundland ' , Canadian Journal of Earth Sciences , vol. 35 , no. 11 , pp. 1271-1287 . |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/evolution-of-the-appalachian-laurentian-margin-lithoprobe-results-in-western-newfoundland(668a22ff-5f6d-45bd-8fb3-fe21f30ca4d7).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1802647021143719936 |