Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane
On the basis of trace-element data, basaltic protoliths for Paleozoic eclogites from the Yukon-Tanana terrane (YTT) have diverse origins. Eclogites from Stewart Lake and the Simpson Range have characteristics of basaltic protoliths generated by subduction-zone magmatism, are hosted by serpentinitic-...
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crcansciencepubl:10.1139/e99-070 2024-03-03T08:44:13+00:00 Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane Creaser, Robert A Goodwin-Bell, Jo-Anne S Erdmer, Philippe 1999 http://dx.doi.org/10.1139/e99-070 http://www.nrcresearchpress.com/doi/pdf/10.1139/e99-070 fr fre Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 36, issue 10, page 1697-1709 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1999 crcansciencepubl https://doi.org/10.1139/e99-070 2024-02-07T10:53:38Z On the basis of trace-element data, basaltic protoliths for Paleozoic eclogites from the Yukon-Tanana terrane (YTT) have diverse origins. Eclogites from Stewart Lake and the Simpson Range have characteristics of basaltic protoliths generated by subduction-zone magmatism, are hosted by serpentinitic-gabbroic rocks, and record Mississippian high-pressure metamorphism and cooling. In contrast, eclogites from Faro, Ross River, and Last Peak show either within-plate geochemistry or mid-ocean ridge protolith geochemistry with a small subduction component, are hosted by continental metasedimentary rocks of the Nisutlin assemblage, and record Permian high-pressure metamorphism and cooling. We interpret these results to derive from the following tectonic events in the Paleozoic history of the YTT: (1) activity at a Devonian-Mississippian convergent plate margin at the distal edge of North America, with near-contemporaneous subduction-zone magmatism and high-pressure metamorphism; (2) Mississippian rifting of that margin to form the outboard YTT, the Slide Mountain marginal basin, and the Faro, Ross River, and Last Peak eclogite protoliths; and (3) west-dipping subduction of the Slide Mountain Ocean under the outboard YTT in Permian time, to produce the Faro, Ross River, and Last Peak eclogites and Permian arc magmatism throughout the YTT. The basaltic protoliths of the Paleozoic YTT eclogites bear close similarity to those produced in rifted convergent margins, such as the Miocene Japanese arc - back-arc system. Article in Journal/Newspaper Faro Ross River Yukon Canadian Science Publishing Yukon Last Peak ENVELOPE(-134.221,-134.221,61.599,61.599) Simpson Range ENVELOPE(-129.920,-129.920,60.883,60.883) Faro ENVELOPE(-133.353,-133.353,62.231,62.231) Canadian Journal of Earth Sciences 36 10 1697 1709 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
French |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Creaser, Robert A Goodwin-Bell, Jo-Anne S Erdmer, Philippe Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane |
topic_facet |
General Earth and Planetary Sciences |
description |
On the basis of trace-element data, basaltic protoliths for Paleozoic eclogites from the Yukon-Tanana terrane (YTT) have diverse origins. Eclogites from Stewart Lake and the Simpson Range have characteristics of basaltic protoliths generated by subduction-zone magmatism, are hosted by serpentinitic-gabbroic rocks, and record Mississippian high-pressure metamorphism and cooling. In contrast, eclogites from Faro, Ross River, and Last Peak show either within-plate geochemistry or mid-ocean ridge protolith geochemistry with a small subduction component, are hosted by continental metasedimentary rocks of the Nisutlin assemblage, and record Permian high-pressure metamorphism and cooling. We interpret these results to derive from the following tectonic events in the Paleozoic history of the YTT: (1) activity at a Devonian-Mississippian convergent plate margin at the distal edge of North America, with near-contemporaneous subduction-zone magmatism and high-pressure metamorphism; (2) Mississippian rifting of that margin to form the outboard YTT, the Slide Mountain marginal basin, and the Faro, Ross River, and Last Peak eclogite protoliths; and (3) west-dipping subduction of the Slide Mountain Ocean under the outboard YTT in Permian time, to produce the Faro, Ross River, and Last Peak eclogites and Permian arc magmatism throughout the YTT. The basaltic protoliths of the Paleozoic YTT eclogites bear close similarity to those produced in rifted convergent margins, such as the Miocene Japanese arc - back-arc system. |
format |
Article in Journal/Newspaper |
author |
Creaser, Robert A Goodwin-Bell, Jo-Anne S Erdmer, Philippe |
author_facet |
Creaser, Robert A Goodwin-Bell, Jo-Anne S Erdmer, Philippe |
author_sort |
Creaser, Robert A |
title |
Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane |
title_short |
Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane |
title_full |
Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane |
title_fullStr |
Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane |
title_full_unstemmed |
Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane |
title_sort |
geochemical and nd isotopic constraints for the origin of eclogite protoliths, northern cordillera: implications for the paleozoic tectonic evolution of the yukon-tanana terrane |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/e99-070 http://www.nrcresearchpress.com/doi/pdf/10.1139/e99-070 |
long_lat |
ENVELOPE(-134.221,-134.221,61.599,61.599) ENVELOPE(-129.920,-129.920,60.883,60.883) ENVELOPE(-133.353,-133.353,62.231,62.231) |
geographic |
Yukon Last Peak Simpson Range Faro |
geographic_facet |
Yukon Last Peak Simpson Range Faro |
genre |
Faro Ross River Yukon |
genre_facet |
Faro Ross River Yukon |
op_source |
Canadian Journal of Earth Sciences volume 36, issue 10, page 1697-1709 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e99-070 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
36 |
container_issue |
10 |
container_start_page |
1697 |
op_container_end_page |
1709 |
_version_ |
1792499704335958016 |