Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores
A novel technique was applied to estimate differences in core shortening in three gravity cores taken at the same core location on the Portuguese continental slope using different coring devices. No obvious deformational features are visible in the fresh core sediments; the isotope stratigraphy and...
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Language: | English |
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2006
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Online Access: | https://oceanrep.geomar.de/id/eprint/2832/ https://oceanrep.geomar.de/id/eprint/2832/1/L%C3%B6wemark.pdf https://doi.org/10.1016/j.margeo.2006.08.004 |
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ftoceanrep:oai:oceanrep.geomar.de:2832 2023-05-15T17:34:24+02:00 Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores Löwemark, L. Schönfeld, Joachim Schäfer, Priska 2006 text https://oceanrep.geomar.de/id/eprint/2832/ https://oceanrep.geomar.de/id/eprint/2832/1/L%C3%B6wemark.pdf https://doi.org/10.1016/j.margeo.2006.08.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/2832/1/L%C3%B6wemark.pdf Löwemark, L., Schönfeld, J. and Schäfer, P. (2006) Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores. Marine Geology, 233 . pp. 37-48. DOI 10.1016/j.margeo.2006.08.004 <https://doi.org/10.1016/j.margeo.2006.08.004>. doi:10.1016/j.margeo.2006.08.004 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2006 ftoceanrep https://doi.org/10.1016/j.margeo.2006.08.004 2023-04-07T14:46:35Z A novel technique was applied to estimate differences in core shortening in three gravity cores taken at the same core location on the Portuguese continental slope using different coring devices. No obvious deformational features are visible in the fresh core sediments; the isotope stratigraphy and abundance maxima of ice-rafted debris, representing North Atlantic Heinrich-events, indicate identical stratigraphic range in all three cores. However, one of the cores is significantly shorter than the others. X-ray radiographs of the cores reveal that the shorter core shows typical deformation structures, whereas the two other cores are lacking signs of deformation. This serious disturbance had likely gone unnoticed had it not been for the X-ray radiographs. As an approach to semi-quantitatively estimate the core shortening, we used the fragmentation and displacement of the pyritized trace fossil Trichichnus that is easily recognizable in X-ray radiographs through its high contrast. The Trichichnus data indicate that a shortening of 50–60% occurred in the lower part of the shorter core. This estimate is in good agreement with variations in apparent sedimentation rates for the interval considered. Accurate flux rates are essential for our understanding marine biogeochemical cycles in general and the marine budgets of nutrients such as carbon and phosphorus in particular. X-ray radiographs are very useful in assessing the intactness of the sedimentary records and the presented method has potential to become a valuable tool in correcting sedimentation rates in disturbed gravity cores. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Burrows ENVELOPE(163.650,163.650,-74.300,-74.300) Marine Geology 233 1-4 37 48 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
A novel technique was applied to estimate differences in core shortening in three gravity cores taken at the same core location on the Portuguese continental slope using different coring devices. No obvious deformational features are visible in the fresh core sediments; the isotope stratigraphy and abundance maxima of ice-rafted debris, representing North Atlantic Heinrich-events, indicate identical stratigraphic range in all three cores. However, one of the cores is significantly shorter than the others. X-ray radiographs of the cores reveal that the shorter core shows typical deformation structures, whereas the two other cores are lacking signs of deformation. This serious disturbance had likely gone unnoticed had it not been for the X-ray radiographs. As an approach to semi-quantitatively estimate the core shortening, we used the fragmentation and displacement of the pyritized trace fossil Trichichnus that is easily recognizable in X-ray radiographs through its high contrast. The Trichichnus data indicate that a shortening of 50–60% occurred in the lower part of the shorter core. This estimate is in good agreement with variations in apparent sedimentation rates for the interval considered. Accurate flux rates are essential for our understanding marine biogeochemical cycles in general and the marine budgets of nutrients such as carbon and phosphorus in particular. X-ray radiographs are very useful in assessing the intactness of the sedimentary records and the presented method has potential to become a valuable tool in correcting sedimentation rates in disturbed gravity cores. |
format |
Article in Journal/Newspaper |
author |
Löwemark, L. Schönfeld, Joachim Schäfer, Priska |
spellingShingle |
Löwemark, L. Schönfeld, Joachim Schäfer, Priska Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores |
author_facet |
Löwemark, L. Schönfeld, Joachim Schäfer, Priska |
author_sort |
Löwemark, L. |
title |
Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores |
title_short |
Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores |
title_full |
Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores |
title_fullStr |
Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores |
title_full_unstemmed |
Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores |
title_sort |
deformation of pyritized burrows: a novel technique for the detection and estimation of core shortening in gravity cores |
publisher |
Elsevier |
publishDate |
2006 |
url |
https://oceanrep.geomar.de/id/eprint/2832/ https://oceanrep.geomar.de/id/eprint/2832/1/L%C3%B6wemark.pdf https://doi.org/10.1016/j.margeo.2006.08.004 |
long_lat |
ENVELOPE(163.650,163.650,-74.300,-74.300) |
geographic |
Burrows |
geographic_facet |
Burrows |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/2832/1/L%C3%B6wemark.pdf Löwemark, L., Schönfeld, J. and Schäfer, P. (2006) Deformation of pyritized burrows: A novel technique for the detection and estimation of core shortening in gravity cores. Marine Geology, 233 . pp. 37-48. DOI 10.1016/j.margeo.2006.08.004 <https://doi.org/10.1016/j.margeo.2006.08.004>. doi:10.1016/j.margeo.2006.08.004 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2006.08.004 |
container_title |
Marine Geology |
container_volume |
233 |
container_issue |
1-4 |
container_start_page |
37 |
op_container_end_page |
48 |
_version_ |
1766133225088876544 |