Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories
The area of study is a small area of allochthonous rocks structurally located immediately above an Archean antiform in the Wopmay Orogen of the Northwest Territories. The rocks of the study area represent various units of the Akaitcho Group epicontinental rift fill deposits. All rocks are allochthon...
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1987
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ftmcmaster:oai:macsphere.mcmaster.ca:11375/19575 2023-05-15T17:46:31+02:00 Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories Davies, Stephen D. Clifford, P. M. Geology 1987-04 http://hdl.handle.net/11375/19575 en eng http://hdl.handle.net/11375/19575 Wopmay Orogen Northwest Territories Akaitcho Group epicontinental rift fill deposits allochthonous rocks Southern exmouth antiform metamorphism and stratigraphy 1987 ftmcmaster 2022-03-22T21:13:43Z The area of study is a small area of allochthonous rocks structurally located immediately above an Archean antiform in the Wopmay Orogen of the Northwest Territories. The rocks of the study area represent various units of the Akaitcho Group epicontinental rift fill deposits. All rocks are allochthonous, lying structurally above basement and autochthonous cover. Within the allochthonous rocks, three phases of deformation and a metamorphic culimnation are evident. The first episode (Dl) involved thrusting and folding of the allochthon over the Slave Craton, coinciding with peak metamorphic conditions. This phase of deformation was followed by an episode of coaxial, thick-skinned folding (D2), producing the large scale folds of basement and cover witnessed in the area. A late cross-folding event (D3), has provided up to 6 km of structural relief in the study area. The deformational history thus recorded in the Wopmay Orogen is similar to that documented in other orogenic belts such as the eastern Alps and Gape Smith Belt in Quebec. Metamorphism in the study area is hot side up Buchan type. A progression is observed in pelitic assemblages from muscovite-sillimanite grade to sillimanite-K feldspar grade, from east to west across the study area. A retrogression has produced sillimanite quartz pods (faserkiesel), its occurrence has permitted a relocation of the pre-existing prograde isograd. These finds are consistent with the current tectonic model for the area. Thesis Bachelor of Science (BSc) Other/Unknown Material Northwest Territories MacSphere (McMaster University) Northwest Territories Buchan ENVELOPE(-44.700,-44.700,-60.766,-60.766) |
institution |
Open Polar |
collection |
MacSphere (McMaster University) |
op_collection_id |
ftmcmaster |
language |
English |
topic |
Wopmay Orogen Northwest Territories Akaitcho Group epicontinental rift fill deposits allochthonous rocks Southern exmouth antiform metamorphism and stratigraphy |
spellingShingle |
Wopmay Orogen Northwest Territories Akaitcho Group epicontinental rift fill deposits allochthonous rocks Southern exmouth antiform metamorphism and stratigraphy Davies, Stephen D. Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories |
topic_facet |
Wopmay Orogen Northwest Territories Akaitcho Group epicontinental rift fill deposits allochthonous rocks Southern exmouth antiform metamorphism and stratigraphy |
description |
The area of study is a small area of allochthonous rocks structurally located immediately above an Archean antiform in the Wopmay Orogen of the Northwest Territories. The rocks of the study area represent various units of the Akaitcho Group epicontinental rift fill deposits. All rocks are allochthonous, lying structurally above basement and autochthonous cover. Within the allochthonous rocks, three phases of deformation and a metamorphic culimnation are evident. The first episode (Dl) involved thrusting and folding of the allochthon over the Slave Craton, coinciding with peak metamorphic conditions. This phase of deformation was followed by an episode of coaxial, thick-skinned folding (D2), producing the large scale folds of basement and cover witnessed in the area. A late cross-folding event (D3), has provided up to 6 km of structural relief in the study area. The deformational history thus recorded in the Wopmay Orogen is similar to that documented in other orogenic belts such as the eastern Alps and Gape Smith Belt in Quebec. Metamorphism in the study area is hot side up Buchan type. A progression is observed in pelitic assemblages from muscovite-sillimanite grade to sillimanite-K feldspar grade, from east to west across the study area. A retrogression has produced sillimanite quartz pods (faserkiesel), its occurrence has permitted a relocation of the pre-existing prograde isograd. These finds are consistent with the current tectonic model for the area. Thesis Bachelor of Science (BSc) |
author2 |
Clifford, P. M. Geology |
author |
Davies, Stephen D. |
author_facet |
Davies, Stephen D. |
author_sort |
Davies, Stephen D. |
title |
Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories |
title_short |
Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories |
title_full |
Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories |
title_fullStr |
Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories |
title_full_unstemmed |
Structure, Metamorphism and Stratigraphy of Allochthonous Units of the Southern Exmouth Antiform, Wopmay Orogen, Northwest Territories |
title_sort |
structure, metamorphism and stratigraphy of allochthonous units of the southern exmouth antiform, wopmay orogen, northwest territories |
publishDate |
1987 |
url |
http://hdl.handle.net/11375/19575 |
long_lat |
ENVELOPE(-44.700,-44.700,-60.766,-60.766) |
geographic |
Northwest Territories Buchan |
geographic_facet |
Northwest Territories Buchan |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_relation |
http://hdl.handle.net/11375/19575 |
_version_ |
1766150215499251712 |