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Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography / Siwan, Davies; Mark, Coleman; Peter, Abbott; Richard, Johnston

Geochemistry, Geophysics, Geosystems, Volume: 16, Issue: 12, Pages: 4329 - 4343

Swansesa University Authors: Siwan, Davies, Mark, Coleman, Peter, Abbott, Richard, Johnston

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DOI (Published version): 10.1002/2015GC006073

Abstract

Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantly influence the potential applicability of tephra deposits as isochronous marker horizons and current techniques, used in isolation, may be insufficient...

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Published in: Geochemistry, Geophysics, Geosystems
ISSN: 1525-2027
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa21422
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These can significantly influence the potential applicability of tephra deposits 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 (&#xB5;CT) to successfully identify tephra deposits preserved within marine sediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensional 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 bioturbation 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. 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spelling 2017-06-22T13:37:17.6991572 v2 21422 2015-05-15 Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography b628382c97124173dd283bf7b83f1eec 0000-0003-0999-7233 Siwan Davies Siwan Davies true false 73c5735de19c8a70acb41ab788081b67 0000-0002-4628-1077 Mark Coleman Mark Coleman true false 26d7380e67d377820751431c8078bb83 0000-0002-6347-9499 Peter Abbott Peter Abbott true false 23282e7acce87dd926b8a62ae410a393 0000-0003-1977-6418 Richard Johnston Richard Johnston true false 2015-05-15 SGE Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantly influence the potential applicability of tephra deposits 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 (µCT) to successfully identify tephra deposits preserved within marine sediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensional 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 bioturbation 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 µCT methods to the identification of cryptotephras within various paleoclimatic sequences and to enhance our understanding of marine sedimentation processes. Journal Article Geochemistry, Geophysics, Geosystems 16 12 4329 4343 1525-2027 X-ray microtomography, tephrochronology,sedimentation, marine, depositional processes 31 12 2015 2015-12-31 10.1002/2015GC006073 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University RCUK 2017-06-22T13:37:17.6991572 2015-05-15T11:02:16.8447356 College of Engineering Engineering Adam J. Griggs 1 Siwan Davies 0000-0003-0999-7233 2 Peter Abbott 0000-0002-6347-9499 3 Mark Coleman 0000-0002-4628-1077 4 Adrian P. Palmer 5 Tine L. Rasmussen 6 Richard Johnston 0000-0003-1977-6418 7 0021422-02062016095431.pdf Griggs_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf 2016-06-02T09:54:31.4170000 Output 6605166 application/pdf Version of Record true 2016-06-02T00:00:00.0000000 true
title Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography
spellingShingle Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography
Siwan, Davies
Mark, Coleman
Peter, Abbott
Richard, Johnston
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
author_id_str_mv b628382c97124173dd283bf7b83f1eec
73c5735de19c8a70acb41ab788081b67
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author_id_fullname_str_mv b628382c97124173dd283bf7b83f1eec_***_Siwan, Davies
73c5735de19c8a70acb41ab788081b67_***_Mark, Coleman
26d7380e67d377820751431c8078bb83_***_Peter, Abbott
23282e7acce87dd926b8a62ae410a393_***_Richard, Johnston
author Siwan, Davies
Mark, Coleman
Peter, Abbott
Richard, Johnston
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description Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantly influence the potential applicability of tephra deposits 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 (µCT) to successfully identify tephra deposits preserved within marine sediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensional 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 bioturbation 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 µCT methods to the identification of cryptotephras within various paleoclimatic sequences and to enhance our understanding of marine sedimentation processes.
published_date 2015-12-31T19:43:11Z
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