New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand
Iceland records over fifteen million years of complex volcanism resulting from the intersection of mid-ocean ridge and mantle plume upwelling. The Iceland mantle plume has been active for at least 70 Ma, with surface expressions in Greenland, the North Atlantic, and Iceland. The Iceland hotspot may...
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00073721 2024-06-23T07:53:25+00:00 New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand Okwueze, Odinaka Konrad, Kevin Capaldi, Tomas 2024-05 electronic https://doi.org/10.5194/egusphere-2024-1299 https://noa.gwlb.de/receive/cop_mods_00073721 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071869/egusphere-2024-1299.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1299/egusphere-2024-1299.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2024-1299 https://noa.gwlb.de/receive/cop_mods_00073721 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071869/egusphere-2024-1299.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1299/egusphere-2024-1299.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/egusphere-2024-1299 2024-05-27T23:38:26Z Iceland records over fifteen million years of complex volcanism resulting from the intersection of mid-ocean ridge and mantle plume upwelling. The Iceland mantle plume has been active for at least 70 Ma, with surface expressions in Greenland, the North Atlantic, and Iceland. The Iceland hotspot may exhibit periods of increased volcanic output linked to pulses of upwelling within the plume. Understanding Iceland’s magmatic history and potential pulsation could provide key insights into dynamic topography driving changes in deep-water oceanic circulation, late Cenozoic climate change and mantle plume – mid-ocean ridge interaction. Detrital geochronology is a powerful tool for capturing the magmatic history of a region. However, Iceland's fine-grained extrusive volcanic lithologies lack the typical detrital mineral phases such as zircon, sanidine, hornblende, and rutile that current geochronology methods utilize. Here we present a new methodology for capturing the magmatic history of fine grained extrusive volcanic rocks using single grain detrital 40Ar/39Ar incremental heating geochronology. The DARL (or Detrital Argon Lithics) method thus far has consisted of 40Ar/39Ar total fusion analyses, which pose a problem in the case of Iceland, due to the nature of its young glassy lava flows commonly displaying subatmospheric 40Ar/36Ar isochron intercepts and low 40Ar*. This work represents a 40Ar/39Ar incremental heating pilot study on 19 single grains of Icelandic river sand (1–3 mm), collected from five different catchments. Fifteen of the 19 basaltic grains produced concordant age experiments that ranged from 0.2 to 13.5 Ma and uncertainties (2σ) from 1 % to 86 % with the grains under 1 Ma having the largest uncertainties. Preliminary results show that basaltic grains with less alteration (and corresponding lower atmospheric argon concentration) yield more accurate age determinations, though altered basaltic grains can still produce statistically valid age determinations. Results presented here show the validity of ... Article in Journal/Newspaper Greenland Iceland North Atlantic Niedersächsisches Online-Archiv NOA Greenland |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Okwueze, Odinaka Konrad, Kevin Capaldi, Tomas New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand |
topic_facet |
article Verlagsveröffentlichung |
description |
Iceland records over fifteen million years of complex volcanism resulting from the intersection of mid-ocean ridge and mantle plume upwelling. The Iceland mantle plume has been active for at least 70 Ma, with surface expressions in Greenland, the North Atlantic, and Iceland. The Iceland hotspot may exhibit periods of increased volcanic output linked to pulses of upwelling within the plume. Understanding Iceland’s magmatic history and potential pulsation could provide key insights into dynamic topography driving changes in deep-water oceanic circulation, late Cenozoic climate change and mantle plume – mid-ocean ridge interaction. Detrital geochronology is a powerful tool for capturing the magmatic history of a region. However, Iceland's fine-grained extrusive volcanic lithologies lack the typical detrital mineral phases such as zircon, sanidine, hornblende, and rutile that current geochronology methods utilize. Here we present a new methodology for capturing the magmatic history of fine grained extrusive volcanic rocks using single grain detrital 40Ar/39Ar incremental heating geochronology. The DARL (or Detrital Argon Lithics) method thus far has consisted of 40Ar/39Ar total fusion analyses, which pose a problem in the case of Iceland, due to the nature of its young glassy lava flows commonly displaying subatmospheric 40Ar/36Ar isochron intercepts and low 40Ar*. This work represents a 40Ar/39Ar incremental heating pilot study on 19 single grains of Icelandic river sand (1–3 mm), collected from five different catchments. Fifteen of the 19 basaltic grains produced concordant age experiments that ranged from 0.2 to 13.5 Ma and uncertainties (2σ) from 1 % to 86 % with the grains under 1 Ma having the largest uncertainties. Preliminary results show that basaltic grains with less alteration (and corresponding lower atmospheric argon concentration) yield more accurate age determinations, though altered basaltic grains can still produce statistically valid age determinations. Results presented here show the validity of ... |
format |
Article in Journal/Newspaper |
author |
Okwueze, Odinaka Konrad, Kevin Capaldi, Tomas |
author_facet |
Okwueze, Odinaka Konrad, Kevin Capaldi, Tomas |
author_sort |
Okwueze, Odinaka |
title |
New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand |
title_short |
New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand |
title_full |
New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand |
title_fullStr |
New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand |
title_full_unstemmed |
New Developments in Incremental Heating Detrital 40Ar/39Ar Lithic (DARL) Geochronology using Icelandic River Sand |
title_sort |
new developments in incremental heating detrital 40ar/39ar lithic (darl) geochronology using icelandic river sand |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-1299 https://noa.gwlb.de/receive/cop_mods_00073721 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071869/egusphere-2024-1299.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1299/egusphere-2024-1299.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_relation |
https://doi.org/10.5194/egusphere-2024-1299 https://noa.gwlb.de/receive/cop_mods_00073721 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071869/egusphere-2024-1299.pdf https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1299/egusphere-2024-1299.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2024-1299 |
_version_ |
1802645028785356800 |