Cargando…

Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum

Flood basalts, the largest volcanic events in Earth history, are thought to drive global environmental change because they can emit large volumes of CO(2) and SO(2) over short geologic time scales. Eruption of the Columbia River Basalt Group (CRBG) has been linked to elevated atmospheric CO(2) and g...

Descripción completa

Detalles Bibliográficos
Autores principales: Kasbohm, Jennifer, Schoene, Blair
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6154988/
https://www.ncbi.nlm.nih.gov/pubmed/30255148
http://dx.doi.org/10.1126/sciadv.aat8223
_version_ 1783357800835973120
author Kasbohm, Jennifer
Schoene, Blair
author_facet Kasbohm, Jennifer
Schoene, Blair
author_sort Kasbohm, Jennifer
collection PubMed
description Flood basalts, the largest volcanic events in Earth history, are thought to drive global environmental change because they can emit large volumes of CO(2) and SO(2) over short geologic time scales. Eruption of the Columbia River Basalt Group (CRBG) has been linked to elevated atmospheric CO(2) and global warming during the mid-Miocene climate optimum (MMCO) ~16 million years (Ma) ago. However, a causative relationship between volcanism and warming remains speculative, as the timing and tempo of CRBG eruptions is not well known. We use U-Pb geochronology on zircon-bearing volcanic ash beds intercalated within the basalt stratigraphy to build a high-resolution CRBG eruption record. Our data set shows that more than 95% of the CRBG erupted between 16.7 and 15.9 Ma, twice as fast as previous estimates. By suggesting a recalibration of the geomagnetic polarity time scale, these data indicate that the onset of flood volcanism is nearly contemporaneous with that of the MMCO.
format Online
Article
Text
id pubmed-6154988
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher American Association for the Advancement of Science
record_format MEDLINE/PubMed
spelling pubmed-61549882018-09-25 Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum Kasbohm, Jennifer Schoene, Blair Sci Adv Research Articles Flood basalts, the largest volcanic events in Earth history, are thought to drive global environmental change because they can emit large volumes of CO(2) and SO(2) over short geologic time scales. Eruption of the Columbia River Basalt Group (CRBG) has been linked to elevated atmospheric CO(2) and global warming during the mid-Miocene climate optimum (MMCO) ~16 million years (Ma) ago. However, a causative relationship between volcanism and warming remains speculative, as the timing and tempo of CRBG eruptions is not well known. We use U-Pb geochronology on zircon-bearing volcanic ash beds intercalated within the basalt stratigraphy to build a high-resolution CRBG eruption record. Our data set shows that more than 95% of the CRBG erupted between 16.7 and 15.9 Ma, twice as fast as previous estimates. By suggesting a recalibration of the geomagnetic polarity time scale, these data indicate that the onset of flood volcanism is nearly contemporaneous with that of the MMCO. American Association for the Advancement of Science 2018-09-19 /pmc/articles/PMC6154988/ /pubmed/30255148 http://dx.doi.org/10.1126/sciadv.aat8223 Text en Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Kasbohm, Jennifer
Schoene, Blair
Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum
title Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum
title_full Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum
title_fullStr Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum
title_full_unstemmed Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum
title_short Rapid eruption of the Columbia River flood basalt and correlation with the mid-Miocene climate optimum
title_sort rapid eruption of the columbia river flood basalt and correlation with the mid-miocene climate optimum
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6154988/
https://www.ncbi.nlm.nih.gov/pubmed/30255148
http://dx.doi.org/10.1126/sciadv.aat8223
work_keys_str_mv AT kasbohmjennifer rapideruptionofthecolumbiariverfloodbasaltandcorrelationwiththemidmioceneclimateoptimum
AT schoeneblair rapideruptionofthecolumbiariverfloodbasaltandcorrelationwiththemidmioceneclimateoptimum