Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites
Abstract Hall Peninsula, on SE Baffin Island, Canada, exposes a lithologically diverse mid-crustal section of the Paleoproterozoic Trans-Hudson Orogen, which features Paleoproterozoic supracrustal strata overlying Archean crystalline basement. Recent mapping, combined with petrological studies and U...
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Online Access: | http://dx.doi.org/10.1093/petrology/egw046 https://academic.oup.com/petrology/article-pdf/57/8/1437/58385610/petrology_57_8_1437.pdf |
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croxfordunivpr:10.1093/petrology/egw046 2024-09-15T17:57:04+00:00 Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites Skipton, D. R. St-Onge, M. R. Schneider, D. A. McFarlane, C. R. M. 2016 http://dx.doi.org/10.1093/petrology/egw046 https://academic.oup.com/petrology/article-pdf/57/8/1437/58385610/petrology_57_8_1437.pdf en eng Oxford University Press (OUP) Journal of Petrology volume 57, issue 8, page 1437-1462 ISSN 1460-2415 0022-3530 journal-article 2016 croxfordunivpr https://doi.org/10.1093/petrology/egw046 2024-08-19T04:23:50Z Abstract Hall Peninsula, on SE Baffin Island, Canada, exposes a lithologically diverse mid-crustal section of the Paleoproterozoic Trans-Hudson Orogen, which features Paleoproterozoic supracrustal strata overlying Archean crystalline basement. Recent mapping, combined with petrological studies and U–Pb monazite dating, provides new insights into the tectonothermal history of the internal zone of the orogen, as well as mid-crustal orogenic processes in general. Peak metamorphic grade is constrained to progressively increase westward from mid-amphibolite- to granulite-facies conditions and three regional deformation events are recognized: east-directed thin-skinned crustal shortening (D 1 ); east-vergent, thick-skinned thrusting and folding (D 2 ); late-orogenic, north–south-directed, thick-skinned folding (D 3 ). Equilibrium phase diagram modeling constrained by garnet compositional transects in pelite indicates peak mid-amphibolite-facies conditions on the eastern peninsula of ∼720–740°C and 6·25–7·25 kbar, followed by cooling and late muscovite growth. In accordance with field evidence for extensive biotite dehydration melting, peak metamorphic conditions of granulite-facies pelite on the western peninsula are estimated at ∼810–890°C and ∼6·1–7·35 kbar. In situ U–Pb monazite geochronology (laser ablation inductively coupled plasma mass spectrometry) constrains the timing of peak metamorphism and concurrent D 1 deformation throughout the peninsula to between c. 1850 and 1825 Ma, coincident with the accretion of crustal blocks and arc terranes during the amalgamation of the orogenic upper plate. A younger population of c. 1800 Ma monazite implies fluid-assisted dissolution–reprecipitation of older monazite, possibly related to the terminal collision of the amalgamated upper plate Churchill domain with the lower plate Superior craton. Combined with published observations, the integrated geochronological and petrological data suggest that the crustal section exposed on Hall Peninsula remained at elevated ... Article in Journal/Newspaper Baffin Island Baffin Hall Peninsula Oxford University Press Journal of Petrology 57 8 1437 1462 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract Hall Peninsula, on SE Baffin Island, Canada, exposes a lithologically diverse mid-crustal section of the Paleoproterozoic Trans-Hudson Orogen, which features Paleoproterozoic supracrustal strata overlying Archean crystalline basement. Recent mapping, combined with petrological studies and U–Pb monazite dating, provides new insights into the tectonothermal history of the internal zone of the orogen, as well as mid-crustal orogenic processes in general. Peak metamorphic grade is constrained to progressively increase westward from mid-amphibolite- to granulite-facies conditions and three regional deformation events are recognized: east-directed thin-skinned crustal shortening (D 1 ); east-vergent, thick-skinned thrusting and folding (D 2 ); late-orogenic, north–south-directed, thick-skinned folding (D 3 ). Equilibrium phase diagram modeling constrained by garnet compositional transects in pelite indicates peak mid-amphibolite-facies conditions on the eastern peninsula of ∼720–740°C and 6·25–7·25 kbar, followed by cooling and late muscovite growth. In accordance with field evidence for extensive biotite dehydration melting, peak metamorphic conditions of granulite-facies pelite on the western peninsula are estimated at ∼810–890°C and ∼6·1–7·35 kbar. In situ U–Pb monazite geochronology (laser ablation inductively coupled plasma mass spectrometry) constrains the timing of peak metamorphism and concurrent D 1 deformation throughout the peninsula to between c. 1850 and 1825 Ma, coincident with the accretion of crustal blocks and arc terranes during the amalgamation of the orogenic upper plate. A younger population of c. 1800 Ma monazite implies fluid-assisted dissolution–reprecipitation of older monazite, possibly related to the terminal collision of the amalgamated upper plate Churchill domain with the lower plate Superior craton. Combined with published observations, the integrated geochronological and petrological data suggest that the crustal section exposed on Hall Peninsula remained at elevated ... |
format |
Article in Journal/Newspaper |
author |
Skipton, D. R. St-Onge, M. R. Schneider, D. A. McFarlane, C. R. M. |
spellingShingle |
Skipton, D. R. St-Onge, M. R. Schneider, D. A. McFarlane, C. R. M. Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites |
author_facet |
Skipton, D. R. St-Onge, M. R. Schneider, D. A. McFarlane, C. R. M. |
author_sort |
Skipton, D. R. |
title |
Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites |
title_short |
Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites |
title_full |
Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites |
title_fullStr |
Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites |
title_full_unstemmed |
Tectonothermal Evolution of the Middle Crust in the Trans-Hudson Orogen, Baffin Island, Canada: Evidence from Petrology and Monazite Geochronology of Sillimanite-bearing Migmatites |
title_sort |
tectonothermal evolution of the middle crust in the trans-hudson orogen, baffin island, canada: evidence from petrology and monazite geochronology of sillimanite-bearing migmatites |
publisher |
Oxford University Press (OUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1093/petrology/egw046 https://academic.oup.com/petrology/article-pdf/57/8/1437/58385610/petrology_57_8_1437.pdf |
genre |
Baffin Island Baffin Hall Peninsula |
genre_facet |
Baffin Island Baffin Hall Peninsula |
op_source |
Journal of Petrology volume 57, issue 8, page 1437-1462 ISSN 1460-2415 0022-3530 |
op_doi |
https://doi.org/10.1093/petrology/egw046 |
container_title |
Journal of Petrology |
container_volume |
57 |
container_issue |
8 |
container_start_page |
1437 |
op_container_end_page |
1462 |
_version_ |
1810433260650496000 |