Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada
The Fire Bay Formation of Trettin (1998), Clements Markham belt, Ellesmere Island, Canada, includes volcanic rocks described as Silurian in age based on Llandovery graptolites in adjacent clastic rocks. New field observations suggest the Llandovery fossils are from packages of the Silurian Danish Ri...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2022
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/cjes-2021-0129 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0129 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0129 |
id |
crcansciencepubl:10.1139/cjes-2021-0129 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/cjes-2021-0129 2024-06-23T07:50:40+00:00 Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada Koch, Megan M. Faehnrich, Karol McClelland, William C. Crowley, James L. Melchin, Michael J. Beranek, Luke P. Strauss, Justin V. 2022 http://dx.doi.org/10.1139/cjes-2021-0129 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0129 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0129 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 59, issue 10, page 639-659 ISSN 0008-4077 1480-3313 journal-article 2022 crcansciencepubl https://doi.org/10.1139/cjes-2021-0129 2024-05-30T08:13:47Z The Fire Bay Formation of Trettin (1998), Clements Markham belt, Ellesmere Island, Canada, includes volcanic rocks described as Silurian in age based on Llandovery graptolites in adjacent clastic rocks. New field observations suggest the Llandovery fossils are from packages of the Silurian Danish River and/or Lands Lokk formations that are fault-bounded rather than stratigraphically tied to Ordovician sections that contain a 470.0 ± 0.2 Ma lithic tuff, volcaniclastic units with maximum depositional ages (MDAs) of 466 ± 2 and 462 ± 2 Ma based on detrital zircon, volcanic clasts with ages of 498 ± 6, 478 ± 4, and 477 ± 8 Ma, and Ordovician conodonts and graptolites of Darriwilian and Sandbian age, respectively. Since the Fire Bay Formation of Trettin (1998) lacks a type section and is fault-bounded with ambiguous age relationships, Ordovician volcanic units and fault-bounded clastic rocks correlated with the Hazen Formation are both included in the Fire Bay assemblage following the original interpretations of Trettin and Nowlan (1990). The Fire Bay assemblage records juvenile Ordovician arc magmatism proximal to the Pearya terrane. The adjacent Lands Lokk Formation yields bimodal age peaks at 440–430 and 465 Ma, MDA of 424 ± 3 Ma, and εHf (t) values of −5 to +10. The signature matches Ordovician Pearya units and Silurian circum-Arctic arc sources but there is no evidence for Silurian arc magmatism between the Pearya terrane and Laurentian margin, compatible with Pearya accretion during oblique Ordovician arc collision and Silurian sinistral translation along the northern Laurentian margin. Article in Journal/Newspaper Arctic Ellesmere Island Canadian Science Publishing Arctic Ellesmere Island Canada Markham ENVELOPE(-57.358,-57.358,-64.296,-64.296) Clements Markham ENVELOPE(-65.969,-65.969,-65.934,-65.934) Danish River ENVELOPE(-81.415,-81.415,79.935,79.935) Fire Bay ENVELOPE(-88.867,-88.867,81.452,81.452) Canadian Journal of Earth Sciences |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
The Fire Bay Formation of Trettin (1998), Clements Markham belt, Ellesmere Island, Canada, includes volcanic rocks described as Silurian in age based on Llandovery graptolites in adjacent clastic rocks. New field observations suggest the Llandovery fossils are from packages of the Silurian Danish River and/or Lands Lokk formations that are fault-bounded rather than stratigraphically tied to Ordovician sections that contain a 470.0 ± 0.2 Ma lithic tuff, volcaniclastic units with maximum depositional ages (MDAs) of 466 ± 2 and 462 ± 2 Ma based on detrital zircon, volcanic clasts with ages of 498 ± 6, 478 ± 4, and 477 ± 8 Ma, and Ordovician conodonts and graptolites of Darriwilian and Sandbian age, respectively. Since the Fire Bay Formation of Trettin (1998) lacks a type section and is fault-bounded with ambiguous age relationships, Ordovician volcanic units and fault-bounded clastic rocks correlated with the Hazen Formation are both included in the Fire Bay assemblage following the original interpretations of Trettin and Nowlan (1990). The Fire Bay assemblage records juvenile Ordovician arc magmatism proximal to the Pearya terrane. The adjacent Lands Lokk Formation yields bimodal age peaks at 440–430 and 465 Ma, MDA of 424 ± 3 Ma, and εHf (t) values of −5 to +10. The signature matches Ordovician Pearya units and Silurian circum-Arctic arc sources but there is no evidence for Silurian arc magmatism between the Pearya terrane and Laurentian margin, compatible with Pearya accretion during oblique Ordovician arc collision and Silurian sinistral translation along the northern Laurentian margin. |
format |
Article in Journal/Newspaper |
author |
Koch, Megan M. Faehnrich, Karol McClelland, William C. Crowley, James L. Melchin, Michael J. Beranek, Luke P. Strauss, Justin V. |
spellingShingle |
Koch, Megan M. Faehnrich, Karol McClelland, William C. Crowley, James L. Melchin, Michael J. Beranek, Luke P. Strauss, Justin V. Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada |
author_facet |
Koch, Megan M. Faehnrich, Karol McClelland, William C. Crowley, James L. Melchin, Michael J. Beranek, Luke P. Strauss, Justin V. |
author_sort |
Koch, Megan M. |
title |
Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada |
title_short |
Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada |
title_full |
Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada |
title_fullStr |
Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada |
title_full_unstemmed |
Age and significance of the Fire Bay assemblage: an Ordovician arc fragment within the Clements Markham belt, northwestern Ellesmere Island, Canada |
title_sort |
age and significance of the fire bay assemblage: an ordovician arc fragment within the clements markham belt, northwestern ellesmere island, canada |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
http://dx.doi.org/10.1139/cjes-2021-0129 https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0129 https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0129 |
long_lat |
ENVELOPE(-57.358,-57.358,-64.296,-64.296) ENVELOPE(-65.969,-65.969,-65.934,-65.934) ENVELOPE(-81.415,-81.415,79.935,79.935) ENVELOPE(-88.867,-88.867,81.452,81.452) |
geographic |
Arctic Ellesmere Island Canada Markham Clements Markham Danish River Fire Bay |
geographic_facet |
Arctic Ellesmere Island Canada Markham Clements Markham Danish River Fire Bay |
genre |
Arctic Ellesmere Island |
genre_facet |
Arctic Ellesmere Island |
op_source |
Canadian Journal of Earth Sciences volume 59, issue 10, page 639-659 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2021-0129 |
container_title |
Canadian Journal of Earth Sciences |
_version_ |
1802641573822857216 |