Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography
Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantl y influence the potential applicability of tephra depos- its as isochronous marker horizons and current techniques, used in isolation, may be insufficie...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hdl.handle.net/10037/12111 https://doi.org/10.1002/2015GC006073 |
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ftunivtroemsoe:oai:munin.uit.no:10037/12111 2023-05-15T14:26:58+02:00 Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography Griggs, Adam J. Davies, Siwan M. Abbott, Peter M. Coleman, Mark Palmer, Adrian P. Rasmussen, Tine Lander Johnston, Richard 2015-12-30 https://hdl.handle.net/10037/12111 https://doi.org/10.1002/2015GC006073 eng eng American Geophysical Union Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Griggs, A.J., Davies, S.M., Abbott, P.M., Coleman, M., Palmer, A.P., Rasmussen, T.L.R., Johnston, R. Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography. Geochemistry Geophysics Geosystems. 2015;16(12):4329-4343 FRIDAID 1319994 doi:10.1002/2015GC006073 1525-2027 https://hdl.handle.net/10037/12111 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.1002/2015GC006073 2021-06-25T17:55:48Z Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantl y influence the potential applicability of tephra depos- its as isochronous marker horizons and current techniques, used in isolation, may be insufficient to fully unravel these processes. Here we demonstrate the innovative application of X-ray microtomography ( m CT) to success- fully identify tephra deposits preserved within marine s ediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensiona l visualizations and animations of tephra dispersal in the sediment permit a more thorough assessment of postdepositional processes revealing a number of complex microsedimentological features that are not revealed by conventional methods. These features include biotur- bation burrows and horizontally discontinuous tephra packages, which have important ramifications for the stratigraphic placement of the isochron in a sedimentary sequence. Our results demonstrate the potential for utilizing rigorous two and three-dimensional microsedimentological analysis of the ichnofabric to enhance and support the use of tephra deposits as isochronous marker horizons and to identify the stratigraphic position that best reflects the primary fallout of ash. The application also provides an exceptional insight into the style and rate of sedimentation processes and permits an assessment of the stratigraphic integrity of a tephra deposit. We discuss the possibility of applying these m CT methods to the identification of cryptotephras within various paleoclimatic sequences and to enhance our understanding of marine sedimentation processes. Article in Journal/Newspaper Arctic University of Tromsø: Munin Open Research Archive Burrows ENVELOPE(163.650,163.650,-74.300,-74.300) Geochemistry, Geophysics, Geosystems 16 12 4329 4343 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
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VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Griggs, Adam J. Davies, Siwan M. Abbott, Peter M. Coleman, Mark Palmer, Adrian P. Rasmussen, Tine Lander Johnston, Richard Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantl y influence the potential applicability of tephra depos- its as isochronous marker horizons and current techniques, used in isolation, may be insufficient to fully unravel these processes. Here we demonstrate the innovative application of X-ray microtomography ( m CT) to success- fully identify tephra deposits preserved within marine s ediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensiona l visualizations and animations of tephra dispersal in the sediment permit a more thorough assessment of postdepositional processes revealing a number of complex microsedimentological features that are not revealed by conventional methods. These features include biotur- bation burrows and horizontally discontinuous tephra packages, which have important ramifications for the stratigraphic placement of the isochron in a sedimentary sequence. Our results demonstrate the potential for utilizing rigorous two and three-dimensional microsedimentological analysis of the ichnofabric to enhance and support the use of tephra deposits as isochronous marker horizons and to identify the stratigraphic position that best reflects the primary fallout of ash. The application also provides an exceptional insight into the style and rate of sedimentation processes and permits an assessment of the stratigraphic integrity of a tephra deposit. We discuss the possibility of applying these m CT methods to the identification of cryptotephras within various paleoclimatic sequences and to enhance our understanding of marine sedimentation processes. |
format |
Article in Journal/Newspaper |
author |
Griggs, Adam J. Davies, Siwan M. Abbott, Peter M. Coleman, Mark Palmer, Adrian P. Rasmussen, Tine Lander Johnston, Richard |
author_facet |
Griggs, Adam J. Davies, Siwan M. Abbott, Peter M. Coleman, Mark Palmer, Adrian P. Rasmussen, Tine Lander Johnston, Richard |
author_sort |
Griggs, Adam J. |
title |
Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography |
title_short |
Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography |
title_full |
Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography |
title_fullStr |
Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography |
title_full_unstemmed |
Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography |
title_sort |
visualizing tephra deposits and sedimentary processes in the marine environment: the potential of x-ray microtomography |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/12111 https://doi.org/10.1002/2015GC006073 |
long_lat |
ENVELOPE(163.650,163.650,-74.300,-74.300) |
geographic |
Burrows |
geographic_facet |
Burrows |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Geochemistry Geophysics Geosystems info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE Griggs, A.J., Davies, S.M., Abbott, P.M., Coleman, M., Palmer, A.P., Rasmussen, T.L.R., Johnston, R. Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography. Geochemistry Geophysics Geosystems. 2015;16(12):4329-4343 FRIDAID 1319994 doi:10.1002/2015GC006073 1525-2027 https://hdl.handle.net/10037/12111 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2015GC006073 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
16 |
container_issue |
12 |
container_start_page |
4329 |
op_container_end_page |
4343 |
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