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...
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fteawag:oai:dora:eawag_5781 2023-05-15T17:53:35+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.N. Schubert, C.J. Hochuli, P.A. Plessen, B. Birgel, D. Flower, B.P. Hinrichs, K.-U. Haug, G.H. 2008 https://doi.org/10.1016/j.epsl.2008.04.046 eng eng Elsevier Earth and Planetary Sciences Letters--Earth Planet. Sci. Lett.--journals:732--0012-821X--1385-013X eawag:5781 journal id: journals:732 issn: 0012-821X e-issn: 1385-013X ut: 000259119900025 local: 13111 scopus: 2-s2.0-47949123190 doi:10.1016/j.epsl.2008.04.046 deglaciation organic matter source kerogen bulk parameters meltwater Text Journal Article 2008 fteawag https://doi.org/10.1016/j.epsl.2008.04.046 2023-04-09T04:47:41Z 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 DORA Eawag Earth and Planetary Science Letters 272 1-2 251 263 |
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English |
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deglaciation organic matter source kerogen bulk parameters meltwater |
spellingShingle |
deglaciation organic matter source kerogen bulk parameters meltwater Meckler, A.N. Schubert, C.J. Hochuli, P.A. Plessen, B. Birgel, D. Flower, B.P. Hinrichs, K.-U. Haug, G.H. Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico — a combined optical and biomarker approach |
topic_facet |
deglaciation organic matter source kerogen bulk parameters meltwater |
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.N. Schubert, C.J. Hochuli, P.A. Plessen, B. Birgel, D. Flower, B.P. Hinrichs, K.-U. Haug, G.H. |
author_facet |
Meckler, A.N. Schubert, C.J. Hochuli, P.A. Plessen, B. Birgel, D. Flower, B.P. Hinrichs, K.-U. Haug, G.H. |
author_sort |
Meckler, A.N. |
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 |
publisher |
Elsevier |
publishDate |
2008 |
url |
https://doi.org/10.1016/j.epsl.2008.04.046 |
genre |
Orca |
genre_facet |
Orca |
op_relation |
Earth and Planetary Sciences Letters--Earth Planet. Sci. Lett.--journals:732--0012-821X--1385-013X eawag:5781 journal id: journals:732 issn: 0012-821X e-issn: 1385-013X ut: 000259119900025 local: 13111 scopus: 2-s2.0-47949123190 doi:10.1016/j.epsl.2008.04.046 |
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_ |
1766161281699545088 |