IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN*
The tectonometamorphic histories of basement and cover units in the eastern Trans-Hudson Orogen attest to the importance of structural, geohydrological, and magmatic controls on the attainment of metamorphic conditions in a convergent-plate-margin setting. In northern Quebec, two metamorphic suites...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.532.2755 2023-05-15T15:35:36+02:00 IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* Marc R. St-onge Natasha Wodicka Steve B. Lucas The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.2755 http://rruff.info/doclib/cm/vol38/CM38_379.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.2755 http://rruff.info/doclib/cm/vol38/CM38_379.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://rruff.info/doclib/cm/vol38/CM38_379.pdf text ftciteseerx 2016-01-08T10:39:52Z The tectonometamorphic histories of basement and cover units in the eastern Trans-Hudson Orogen attest to the importance of structural, geohydrological, and magmatic controls on the attainment of metamorphic conditions in a convergent-plate-margin setting. In northern Quebec, two metamorphic suites are recognized in the parautochthonous (lower-plate) Superior Province basement. An older metamorphic suite comprises arc-related, granulite-facies assemblages (less than 5 kbar and 860 to 920°C) dated at ca. 2.70 Ga. A younger, overprinting, collision-related metamorphic suite comprises amphibolite-facies assemblages (7.7 kbar at 640°C to 9.8 kbar at 715°C) dated at ca. 1.80 Ga. Within the overlying Paleoproterozoic Cape Smith Belt (lower-plate, south-verging thrust belt), thermal-peak mineral growth is syn- to post-thrusting; a relatively high-pressure, greenschist- to amphibolite-facies metamorphism (6.3 kbar at 400°C to 9.1 kbar at 575°C) is interpreted to be a result of ca. 1.80 Ga collision-related thickening. At higher structural levels, upper-plate mid-crust plutonic and metasedimentary units of the 1.86–1.82 Ga Narsajuaq arc contain granulite-facies assemblages (7–10 kbar and 800–900°C) retrograded to amphibolite-facies conditions (7– 9 kbar and 700–775°C) during collision-related thrusting. At the structurally highest level, granulite-facies metamorphism of the (upper-plate) Lake Harbour Group and Blandford Bay assemblage is related to emplacement of the 1.86–1.85 Ga Cumberland batholith. Between ca. 1820 and 1795 Ma, accretion and collision-related thickening resulted in retrogression of the granulite-facies assemblages in the Narsajuaq arc, Lake Harbour Group and Blandford Bay assemblage, thermal peak metamorphism of Text Baffin Unknown Blandford Bay ENVELOPE(-71.415,-71.415,63.551,63.551) Cape Smith ENVELOPE(-62.520,-62.520,-62.981,-62.981) Hudson Lake Harbour ENVELOPE(-69.848,-69.848,62.834,62.834) Plate Lake ENVELOPE(-130.720,-130.720,59.900,59.900) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
The tectonometamorphic histories of basement and cover units in the eastern Trans-Hudson Orogen attest to the importance of structural, geohydrological, and magmatic controls on the attainment of metamorphic conditions in a convergent-plate-margin setting. In northern Quebec, two metamorphic suites are recognized in the parautochthonous (lower-plate) Superior Province basement. An older metamorphic suite comprises arc-related, granulite-facies assemblages (less than 5 kbar and 860 to 920°C) dated at ca. 2.70 Ga. A younger, overprinting, collision-related metamorphic suite comprises amphibolite-facies assemblages (7.7 kbar at 640°C to 9.8 kbar at 715°C) dated at ca. 1.80 Ga. Within the overlying Paleoproterozoic Cape Smith Belt (lower-plate, south-verging thrust belt), thermal-peak mineral growth is syn- to post-thrusting; a relatively high-pressure, greenschist- to amphibolite-facies metamorphism (6.3 kbar at 400°C to 9.1 kbar at 575°C) is interpreted to be a result of ca. 1.80 Ga collision-related thickening. At higher structural levels, upper-plate mid-crust plutonic and metasedimentary units of the 1.86–1.82 Ga Narsajuaq arc contain granulite-facies assemblages (7–10 kbar and 800–900°C) retrograded to amphibolite-facies conditions (7– 9 kbar and 700–775°C) during collision-related thrusting. At the structurally highest level, granulite-facies metamorphism of the (upper-plate) Lake Harbour Group and Blandford Bay assemblage is related to emplacement of the 1.86–1.85 Ga Cumberland batholith. Between ca. 1820 and 1795 Ma, accretion and collision-related thickening resulted in retrogression of the granulite-facies assemblages in the Narsajuaq arc, Lake Harbour Group and Blandford Bay assemblage, thermal peak metamorphism of |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Marc R. St-onge Natasha Wodicka Steve B. Lucas |
spellingShingle |
Marc R. St-onge Natasha Wodicka Steve B. Lucas IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* |
author_facet |
Marc R. St-onge Natasha Wodicka Steve B. Lucas |
author_sort |
Marc R. St-onge |
title |
IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* |
title_short |
IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* |
title_full |
IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* |
title_fullStr |
IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* |
title_full_unstemmed |
IN A CONVERGENT-PLATE-MARGIN SETTING: SYNTHESIS OF THE QUEBEC–BAFFIN SEGMENT OF THE TRANS-HUDSON OROGEN* |
title_sort |
in a convergent-plate-margin setting: synthesis of the quebec–baffin segment of the trans-hudson orogen* |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.2755 http://rruff.info/doclib/cm/vol38/CM38_379.pdf |
long_lat |
ENVELOPE(-71.415,-71.415,63.551,63.551) ENVELOPE(-62.520,-62.520,-62.981,-62.981) ENVELOPE(-69.848,-69.848,62.834,62.834) ENVELOPE(-130.720,-130.720,59.900,59.900) |
geographic |
Blandford Bay Cape Smith Hudson Lake Harbour Plate Lake |
geographic_facet |
Blandford Bay Cape Smith Hudson Lake Harbour Plate Lake |
genre |
Baffin |
genre_facet |
Baffin |
op_source |
http://rruff.info/doclib/cm/vol38/CM38_379.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.2755 http://rruff.info/doclib/cm/vol38/CM38_379.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766365944083382272 |