Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island
In Ellesmere Island, the Canadian Shield and Arctic Platform are flanked on the northwest by the lower Paleozoic Franklinian mobile belt, which comprises an unstable shelf (miogeocline) and a deep-water basin, divisible into an inner sedimentary belt and an outer sedimentary–volcanic belt. Both are...
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Canadian Science Publishing
1987
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crcansciencepubl:10.1139/e87-025 2024-06-23T07:50:43+00:00 Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island Trettin, H. P. 1987 http://dx.doi.org/10.1139/e87-025 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-025 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 24, issue 2, page 224-245 ISSN 0008-4077 1480-3313 journal-article 1987 crcansciencepubl https://doi.org/10.1139/e87-025 2024-06-13T04:10:51Z In Ellesmere Island, the Canadian Shield and Arctic Platform are flanked on the northwest by the lower Paleozoic Franklinian mobile belt, which comprises an unstable shelf (miogeocline) and a deep-water basin, divisible into an inner sedimentary belt and an outer sedimentary–volcanic belt. Both are tied to the shelf by interlocking facies changes, but additional exotic units may be present in the outer belt.Pearya, bordering the deep-water basin on the northwest, is divisible into four successions. Succession I comprises sedimentary and(?) volcanic rocks, deformed, metamorphosed to amphibolite grade, and intruded by granitic plutons at 1.0–1.1 Ga. Succession II consists mainly of platformal sediments (carbonates, quartzite, mudrock), with smaller proportions of mafic and siliceous volcanics, diamictite, and chert ranging in age from Late Proterozoic (Hadrynian) to latest Cambrian or Early Ordovician. Its concealed contact with succession I is tentatively interpreted as an angular unconformity. Succession III (Lower to Middle Ordovician?) includes arc-type and ocean-floor volcanics, chert, mudrock, and carbonates and is associated with fault slices of Lower Ordovician (Arenig) ultramafic–mafic complexes–possibly dismembered ophiolites. The faulted contact of succession III and the ultramafics with succession II is unconformably overlapped by succession IV, 7–8 km of volcanic and sedimentary rocks ranging in age from late Middle Ordovician (Blackriverian = early Caradoc) to Late Silurian (late Ludlow?). The angular unconformity at the base of succession IV represents the early Middle Ordovician (Llandeilo–Llanvirn) M'Clintock Orogeny, which was accompanied by metamorphism up to amphibolite grade and granitic plutonism. Pearya is related to the Appalachian–Caledonian mobile belt by the Grenville age of its basement, the age of its ultramafic–mafic complexes, and evidence for a Middle Ordovician orogeny, comparable in age and character to the Taconic. By contrast, the Franklinian mobile belt has a Lower Proterozoic ... Article in Journal/Newspaper Arctic Ellesmere Island Canadian Science Publishing Arctic Ellesmere Island M'Clintock ENVELOPE(-94.214,-94.214,57.802,57.802) Canadian Journal of Earth Sciences 24 2 224 245 |
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Open Polar |
collection |
Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
In Ellesmere Island, the Canadian Shield and Arctic Platform are flanked on the northwest by the lower Paleozoic Franklinian mobile belt, which comprises an unstable shelf (miogeocline) and a deep-water basin, divisible into an inner sedimentary belt and an outer sedimentary–volcanic belt. Both are tied to the shelf by interlocking facies changes, but additional exotic units may be present in the outer belt.Pearya, bordering the deep-water basin on the northwest, is divisible into four successions. Succession I comprises sedimentary and(?) volcanic rocks, deformed, metamorphosed to amphibolite grade, and intruded by granitic plutons at 1.0–1.1 Ga. Succession II consists mainly of platformal sediments (carbonates, quartzite, mudrock), with smaller proportions of mafic and siliceous volcanics, diamictite, and chert ranging in age from Late Proterozoic (Hadrynian) to latest Cambrian or Early Ordovician. Its concealed contact with succession I is tentatively interpreted as an angular unconformity. Succession III (Lower to Middle Ordovician?) includes arc-type and ocean-floor volcanics, chert, mudrock, and carbonates and is associated with fault slices of Lower Ordovician (Arenig) ultramafic–mafic complexes–possibly dismembered ophiolites. The faulted contact of succession III and the ultramafics with succession II is unconformably overlapped by succession IV, 7–8 km of volcanic and sedimentary rocks ranging in age from late Middle Ordovician (Blackriverian = early Caradoc) to Late Silurian (late Ludlow?). The angular unconformity at the base of succession IV represents the early Middle Ordovician (Llandeilo–Llanvirn) M'Clintock Orogeny, which was accompanied by metamorphism up to amphibolite grade and granitic plutonism. Pearya is related to the Appalachian–Caledonian mobile belt by the Grenville age of its basement, the age of its ultramafic–mafic complexes, and evidence for a Middle Ordovician orogeny, comparable in age and character to the Taconic. By contrast, the Franklinian mobile belt has a Lower Proterozoic ... |
format |
Article in Journal/Newspaper |
author |
Trettin, H. P. |
spellingShingle |
Trettin, H. P. Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island |
author_facet |
Trettin, H. P. |
author_sort |
Trettin, H. P. |
title |
Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island |
title_short |
Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island |
title_full |
Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island |
title_fullStr |
Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island |
title_full_unstemmed |
Pearya: a composite terrane with Caledonian affinities in northern Ellesmere Island |
title_sort |
pearya: a composite terrane with caledonian affinities in northern ellesmere island |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/e87-025 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-025 |
long_lat |
ENVELOPE(-94.214,-94.214,57.802,57.802) |
geographic |
Arctic Ellesmere Island M'Clintock |
geographic_facet |
Arctic Ellesmere Island M'Clintock |
genre |
Arctic Ellesmere Island |
genre_facet |
Arctic Ellesmere Island |
op_source |
Canadian Journal of Earth Sciences volume 24, issue 2, page 224-245 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e87-025 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
24 |
container_issue |
2 |
container_start_page |
224 |
op_container_end_page |
245 |
_version_ |
1802641626408943616 |