The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera
The mid-Cretaceous Anvil batholith, in south-central Yukon near Faro, intrudes Upper Proterozoic to upper Paleozoic strata of the Cordilleran outer miogeocline. From previous work, it was unclear whether biotite, andalusite–staurolite, and garnet isograds near the pluton resulted from pre-Devonian r...
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Online Access: | http://dx.doi.org/10.1139/e90-032 http://www.nrcresearchpress.com/doi/pdf/10.1139/e90-032 |
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crcansciencepubl:10.1139/e90-032 2023-12-17T10:29:58+01:00 The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera Smith, J. M. Erdmer, P. 1990 http://dx.doi.org/10.1139/e90-032 http://www.nrcresearchpress.com/doi/pdf/10.1139/e90-032 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 27, issue 3, page 344-356 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1990 crcansciencepubl https://doi.org/10.1139/e90-032 2023-11-19T13:39:25Z The mid-Cretaceous Anvil batholith, in south-central Yukon near Faro, intrudes Upper Proterozoic to upper Paleozoic strata of the Cordilleran outer miogeocline. From previous work, it was unclear whether biotite, andalusite–staurolite, and garnet isograds near the pluton resulted from pre-Devonian regional metamorphism and subsequent arching in a structural culmination or from mid-Cretaceous instrusion. The present study has documented biotite, andalusite, staurolite, garnet, and sillimanite isograds concentric to the pluton. Prophyroblast–matrix relationships indicate that peak metamorphism occurred during intrusion, which took place under approximately 3 kbar (300 MPa) pressure and heated country rock to temperatures of 600°–620 °C. The metamorphism is thus compatible with a deep, mid-Cretaceous event. Regional uplift of 10 km is implied by the metamorphic minerals. From cogenetic relationships between some phases of the Anvil batholith and the nearby South Fork volcanic rocks, regional uplift appears to have been completed in a few million years in the mid-Cretaceous. The uncharacteristic aureole suggests that mid-Cretaceous events in this region are atypical of the Cordillera and may reflect a unique tectonic history or position in the orogen. Article in Journal/Newspaper Faro Yukon Canadian Science Publishing (via Crossref) Yukon South Fork ENVELOPE(161.250,161.250,-77.567,-77.567) Anvil ENVELOPE(-64.267,-64.267,-65.239,-65.239) Faro ENVELOPE(-133.353,-133.353,62.231,62.231) Canadian Journal of Earth Sciences 27 3 344 356 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Smith, J. M. Erdmer, P. The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera |
topic_facet |
General Earth and Planetary Sciences |
description |
The mid-Cretaceous Anvil batholith, in south-central Yukon near Faro, intrudes Upper Proterozoic to upper Paleozoic strata of the Cordilleran outer miogeocline. From previous work, it was unclear whether biotite, andalusite–staurolite, and garnet isograds near the pluton resulted from pre-Devonian regional metamorphism and subsequent arching in a structural culmination or from mid-Cretaceous instrusion. The present study has documented biotite, andalusite, staurolite, garnet, and sillimanite isograds concentric to the pluton. Prophyroblast–matrix relationships indicate that peak metamorphism occurred during intrusion, which took place under approximately 3 kbar (300 MPa) pressure and heated country rock to temperatures of 600°–620 °C. The metamorphism is thus compatible with a deep, mid-Cretaceous event. Regional uplift of 10 km is implied by the metamorphic minerals. From cogenetic relationships between some phases of the Anvil batholith and the nearby South Fork volcanic rocks, regional uplift appears to have been completed in a few million years in the mid-Cretaceous. The uncharacteristic aureole suggests that mid-Cretaceous events in this region are atypical of the Cordillera and may reflect a unique tectonic history or position in the orogen. |
format |
Article in Journal/Newspaper |
author |
Smith, J. M. Erdmer, P. |
author_facet |
Smith, J. M. Erdmer, P. |
author_sort |
Smith, J. M. |
title |
The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera |
title_short |
The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera |
title_full |
The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera |
title_fullStr |
The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera |
title_full_unstemmed |
The Anvil aureole, an atypical mid-Cretaceous culmination in the northern Canadian Cordillera |
title_sort |
anvil aureole, an atypical mid-cretaceous culmination in the northern canadian cordillera |
publisher |
Canadian Science Publishing |
publishDate |
1990 |
url |
http://dx.doi.org/10.1139/e90-032 http://www.nrcresearchpress.com/doi/pdf/10.1139/e90-032 |
long_lat |
ENVELOPE(161.250,161.250,-77.567,-77.567) ENVELOPE(-64.267,-64.267,-65.239,-65.239) ENVELOPE(-133.353,-133.353,62.231,62.231) |
geographic |
Yukon South Fork Anvil Faro |
geographic_facet |
Yukon South Fork Anvil Faro |
genre |
Faro Yukon |
genre_facet |
Faro Yukon |
op_source |
Canadian Journal of Earth Sciences volume 27, issue 3, page 344-356 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e90-032 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
27 |
container_issue |
3 |
container_start_page |
344 |
op_container_end_page |
356 |
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1785582851763208192 |