What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.)
The ~30 Ma to Recent Wrangell Arc (WA), Alaska is an ideal location to study subduction and slab-edge magmatism. However, the WA covers a huge area (~15,000 km2) and ~29% of the WA is covered by glaciers with rugged topography, making bedrock sampling challenging. We addressed these barriers with ge...
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ftdoajarticles:oai:doaj.org/article:d1262e903a9740efa3b5d912efc99333 2023-10-09T21:51:48+02:00 What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) Matthew Brueseke Beth K. Morter Jeffrey A Benowitz Jeffrey Trop Stanley A Mertzman Carl S Kirby Kailyn Davis 2023-09-01T00:00:00Z https://doi.org/10.30909/vol.06.02.313329 https://doaj.org/article/d1262e903a9740efa3b5d912efc99333 EN eng Volcanica https://www.jvolcanica.org/ojs/index.php/volcanica/article/view/226 https://doaj.org/toc/2610-3540 2610-3540 doi:10.30909/vol.06.02.313329 https://doaj.org/article/d1262e903a9740efa3b5d912efc99333 Volcanica, Vol 6, Iss 2, Pp 313-329 (2023) detrital igneous petrology subduction zones volcanic field sampling clast Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.30909/vol.06.02.313329 2023-09-17T00:38:02Z The ~30 Ma to Recent Wrangell Arc (WA), Alaska is an ideal location to study subduction and slab-edge magmatism. However, the WA covers a huge area (~15,000 km2) and ~29% of the WA is covered by glaciers with rugged topography, making bedrock sampling challenging. We addressed these barriers with geochemical and geochronologic analyses on igneous cobbles collected from rivers encircling the WA. Results show that magmatism migrated southward and then northwestward, mirroring bedrock studies. Cobble geochemistry overlaps bedrock results, where calc-alkaline and adakitic cobbles are spatially and temporally ubiquitous in the WA, indicating that subduction and slab melting have been dominant processes. Intra-arc extension-related transitional-tholeiitic cobbles are not found in southwestern WA rivers and are limited in both bedrock and cobble data. The novel tandem cobble method closely matches the bedrock record in geochemical, temporal, and spatial contexts and can be used when bedrock access concerns and/or for characterizing watersheds. Article in Journal/Newspaper glaciers Alaska Directory of Open Access Journals: DOAJ Articles Volcanica 6 2 313 329 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
detrital igneous petrology subduction zones volcanic field sampling clast Geology QE1-996.5 |
spellingShingle |
detrital igneous petrology subduction zones volcanic field sampling clast Geology QE1-996.5 Matthew Brueseke Beth K. Morter Jeffrey A Benowitz Jeffrey Trop Stanley A Mertzman Carl S Kirby Kailyn Davis What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) |
topic_facet |
detrital igneous petrology subduction zones volcanic field sampling clast Geology QE1-996.5 |
description |
The ~30 Ma to Recent Wrangell Arc (WA), Alaska is an ideal location to study subduction and slab-edge magmatism. However, the WA covers a huge area (~15,000 km2) and ~29% of the WA is covered by glaciers with rugged topography, making bedrock sampling challenging. We addressed these barriers with geochemical and geochronologic analyses on igneous cobbles collected from rivers encircling the WA. Results show that magmatism migrated southward and then northwestward, mirroring bedrock studies. Cobble geochemistry overlaps bedrock results, where calc-alkaline and adakitic cobbles are spatially and temporally ubiquitous in the WA, indicating that subduction and slab melting have been dominant processes. Intra-arc extension-related transitional-tholeiitic cobbles are not found in southwestern WA rivers and are limited in both bedrock and cobble data. The novel tandem cobble method closely matches the bedrock record in geochemical, temporal, and spatial contexts and can be used when bedrock access concerns and/or for characterizing watersheds. |
format |
Article in Journal/Newspaper |
author |
Matthew Brueseke Beth K. Morter Jeffrey A Benowitz Jeffrey Trop Stanley A Mertzman Carl S Kirby Kailyn Davis |
author_facet |
Matthew Brueseke Beth K. Morter Jeffrey A Benowitz Jeffrey Trop Stanley A Mertzman Carl S Kirby Kailyn Davis |
author_sort |
Matthew Brueseke |
title |
What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) |
title_short |
What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) |
title_full |
What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) |
title_fullStr |
What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) |
title_full_unstemmed |
What lies beneath the ice? Using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (Wrangell Arc, Alaska, U.S.A.) |
title_sort |
what lies beneath the ice? using the geochemistry and geochronology of modern river cobbles to better decipher the evolution of a glaciated volcanic arc (wrangell arc, alaska, u.s.a.) |
publisher |
Volcanica |
publishDate |
2023 |
url |
https://doi.org/10.30909/vol.06.02.313329 https://doaj.org/article/d1262e903a9740efa3b5d912efc99333 |
genre |
glaciers Alaska |
genre_facet |
glaciers Alaska |
op_source |
Volcanica, Vol 6, Iss 2, Pp 313-329 (2023) |
op_relation |
https://www.jvolcanica.org/ojs/index.php/volcanica/article/view/226 https://doaj.org/toc/2610-3540 2610-3540 doi:10.30909/vol.06.02.313329 https://doaj.org/article/d1262e903a9740efa3b5d912efc99333 |
op_doi |
https://doi.org/10.30909/vol.06.02.313329 |
container_title |
Volcanica |
container_volume |
6 |
container_issue |
2 |
container_start_page |
313 |
op_container_end_page |
329 |
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1779314918580813824 |