Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach
In this study we assessed changes in the contribution of terrigenous organic matter (OM) to the Gulf of Mexico over the course of the last deglaciation (the last 25 kyr). To this end, we combined optical kerogen analyses with bulk sedimentary, biomarker, and compound-specific carbon isotope analyses...
Published in: | Earth and Planetary Science Letters |
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_237325 2023-05-15T17:53:34+02:00 Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach Meckler, A. Schubert, C. Hochuli, P. Plessen, B. Birgel, D. Flower, B. Hinrichs, K. Haug, G. 2008 https://gfzpublic.gfz-potsdam.de/pubman/item/item_237325 unknown info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2008.04.046 https://gfzpublic.gfz-potsdam.de/pubman/item/item_237325 Earth and Planetary Science Letters 550 - Earth sciences info:eu-repo/semantics/article 2008 ftgfzpotsdam https://doi.org/10.1016/j.epsl.2008.04.046 2022-09-14T05:57:06Z In this study we assessed changes in the contribution of terrigenous organic matter (OM) to the Gulf of Mexico over the course of the last deglaciation (the last 25 kyr). To this end, we combined optical kerogen analyses with bulk sedimentary, biomarker, and compound-specific carbon isotope analyses. Samples were obtained from core MD02-2550 from Orca Basin (2249 m water depth at 26°56.77N, 91°20.74W) with temporal resolution ranging from multi-decadal to millennial-scale, depending on the proxy. All proxies confirmed larger terrigenous input during glacial times compared to the Holocene. In addition, the kerogen analyses suggest that much of the glacial OM is reworked (at least 50% of spores and pollen grains and 40% of dinoflagellate cysts). The Holocene sediments, in contrast, contain mainly marine OM, which is exceptionally well preserved. During the deglaciation, terrigenous input was generally high due to large meltwater fluxes, whereby discrepancies between different proxies call for additional influences, such as the change in distance to the river mouth, local productivity changes, and hydrodynamic particle sorting. It is possible that kerogen particles and the terrigenous biomarkers studied here represent distinct pools of land-derived OM with inputs varying independently. Article in Journal/Newspaper Orca GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Earth and Planetary Science Letters 272 1-2 251 263 |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Meckler, A. Schubert, C. Hochuli, P. Plessen, B. Birgel, D. Flower, B. Hinrichs, K. Haug, G. Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach |
topic_facet |
550 - Earth sciences |
description |
In this study we assessed changes in the contribution of terrigenous organic matter (OM) to the Gulf of Mexico over the course of the last deglaciation (the last 25 kyr). To this end, we combined optical kerogen analyses with bulk sedimentary, biomarker, and compound-specific carbon isotope analyses. Samples were obtained from core MD02-2550 from Orca Basin (2249 m water depth at 26°56.77N, 91°20.74W) with temporal resolution ranging from multi-decadal to millennial-scale, depending on the proxy. All proxies confirmed larger terrigenous input during glacial times compared to the Holocene. In addition, the kerogen analyses suggest that much of the glacial OM is reworked (at least 50% of spores and pollen grains and 40% of dinoflagellate cysts). The Holocene sediments, in contrast, contain mainly marine OM, which is exceptionally well preserved. During the deglaciation, terrigenous input was generally high due to large meltwater fluxes, whereby discrepancies between different proxies call for additional influences, such as the change in distance to the river mouth, local productivity changes, and hydrodynamic particle sorting. It is possible that kerogen particles and the terrigenous biomarkers studied here represent distinct pools of land-derived OM with inputs varying independently. |
format |
Article in Journal/Newspaper |
author |
Meckler, A. Schubert, C. Hochuli, P. Plessen, B. Birgel, D. Flower, B. Hinrichs, K. Haug, G. |
author_facet |
Meckler, A. Schubert, C. Hochuli, P. Plessen, B. Birgel, D. Flower, B. Hinrichs, K. Haug, G. |
author_sort |
Meckler, A. |
title |
Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach |
title_short |
Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach |
title_full |
Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach |
title_fullStr |
Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach |
title_full_unstemmed |
Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — A combined optical and biomarker approach |
title_sort |
glacial to holocene terrigenous organic matter input to sediments from orca basin, gulf of mexico — a combined optical and biomarker approach |
publishDate |
2008 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_237325 |
genre |
Orca |
genre_facet |
Orca |
op_source |
Earth and Planetary Science Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2008.04.046 https://gfzpublic.gfz-potsdam.de/pubman/item/item_237325 |
op_doi |
https://doi.org/10.1016/j.epsl.2008.04.046 |
container_title |
Earth and Planetary Science Letters |
container_volume |
272 |
container_issue |
1-2 |
container_start_page |
251 |
op_container_end_page |
263 |
_version_ |
1766161272373510144 |