New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California
A high-resolution, 55 kyr long record of chalcophile and redox-sensitive trace element accumulation (Ag, Cd, Re, and Mo) from MD02-2515, western Guaymas Basin, is investigated in conjunction with patterns in stratigraphy and productivity. High opal concentrations (~59 wt. %), representing increased...
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Language: | English |
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Amer Geophysical Union
2015
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ftarchimer:oai:archimer.ifremer.fr:40566 2023-05-15T16:30:02+02:00 New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California Chang, Alice S. Pichevin, Laetitia Pedersen, Thomas F. Gray, Victoria Ganeshram, Raja 2015-02 application/pdf https://archimer.ifremer.fr/doc/00294/40566/39461.pdf https://archimer.ifremer.fr/doc/00294/40566/39462.doc https://archimer.ifremer.fr/doc/00294/40566/39463.pdf https://doi.org/10.1002/2014PA002681 https://archimer.ifremer.fr/doc/00294/40566/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00294/40566/39461.pdf https://archimer.ifremer.fr/doc/00294/40566/39462.doc https://archimer.ifremer.fr/doc/00294/40566/39463.pdf doi:10.1002/2014PA002681 https://archimer.ifremer.fr/doc/00294/40566/ 2015. American Geophysical Union. All Rights Reserved info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2015-02 , Vol. 30 , N. 2 , P. 77-94 productivity redox trace elements laminated sediments Guaymas Basin northeast Pacific Ocean text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1002/2014PA002681 2021-09-23T20:27:02Z A high-resolution, 55 kyr long record of chalcophile and redox-sensitive trace element accumulation (Ag, Cd, Re, and Mo) from MD02-2515, western Guaymas Basin, is investigated in conjunction with patterns in stratigraphy and productivity. High opal concentrations (~59 wt. %), representing increased diatom production, coincide with laminated sediments and dilute the concentrations of organic carbon (Corg) and metals. A similarity between opal and normalized Corg, Ag, and Cd concentrations suggests delivery to the sediments by diatom export production, while patterns in normalized Re and Mo accumulation suggest a different emplacement mechanism. Although Mo enrichment in organic-rich, laminated sediments typically represents anoxic conditions at other locations, Mo (and Re) in Guaymas Basin is enriched in nonlaminated and bioturbated sediments that are representative of oxygenated conditions. Adsorption onto Fe- and/or Mn-oxyhydroxide surfaces during oxygenation inadequately explains both the Re and Mo enrichments. Thus, recently published mechanisms invoking direct Re and Mo removal from the water column and bioturbation-assisted irrigation of Re into the sediments are used to explain the counterintuitive observations in Guaymas Basin. The MD02-2515 stratigraphic and proxy records are also different from other records in the northeast Pacific in that there is little correspondence with Greenland Dansgaard-Oeschger interstadials. There is some correlation with Heinrich events, suggesting that ventilation of intermediate waters and/or reduced productivity may be important in controlling stratigraphy and trace element accumulation. The results question whether MD02-2515 records can be compared to northeast Pacific open-margin records, especially before 17 kyr B.P. Article in Journal/Newspaper Greenland Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Pacific Paleoceanography 30 2 77 94 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
productivity redox trace elements laminated sediments Guaymas Basin northeast Pacific Ocean |
spellingShingle |
productivity redox trace elements laminated sediments Guaymas Basin northeast Pacific Ocean Chang, Alice S. Pichevin, Laetitia Pedersen, Thomas F. Gray, Victoria Ganeshram, Raja New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California |
topic_facet |
productivity redox trace elements laminated sediments Guaymas Basin northeast Pacific Ocean |
description |
A high-resolution, 55 kyr long record of chalcophile and redox-sensitive trace element accumulation (Ag, Cd, Re, and Mo) from MD02-2515, western Guaymas Basin, is investigated in conjunction with patterns in stratigraphy and productivity. High opal concentrations (~59 wt. %), representing increased diatom production, coincide with laminated sediments and dilute the concentrations of organic carbon (Corg) and metals. A similarity between opal and normalized Corg, Ag, and Cd concentrations suggests delivery to the sediments by diatom export production, while patterns in normalized Re and Mo accumulation suggest a different emplacement mechanism. Although Mo enrichment in organic-rich, laminated sediments typically represents anoxic conditions at other locations, Mo (and Re) in Guaymas Basin is enriched in nonlaminated and bioturbated sediments that are representative of oxygenated conditions. Adsorption onto Fe- and/or Mn-oxyhydroxide surfaces during oxygenation inadequately explains both the Re and Mo enrichments. Thus, recently published mechanisms invoking direct Re and Mo removal from the water column and bioturbation-assisted irrigation of Re into the sediments are used to explain the counterintuitive observations in Guaymas Basin. The MD02-2515 stratigraphic and proxy records are also different from other records in the northeast Pacific in that there is little correspondence with Greenland Dansgaard-Oeschger interstadials. There is some correlation with Heinrich events, suggesting that ventilation of intermediate waters and/or reduced productivity may be important in controlling stratigraphy and trace element accumulation. The results question whether MD02-2515 records can be compared to northeast Pacific open-margin records, especially before 17 kyr B.P. |
format |
Article in Journal/Newspaper |
author |
Chang, Alice S. Pichevin, Laetitia Pedersen, Thomas F. Gray, Victoria Ganeshram, Raja |
author_facet |
Chang, Alice S. Pichevin, Laetitia Pedersen, Thomas F. Gray, Victoria Ganeshram, Raja |
author_sort |
Chang, Alice S. |
title |
New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California |
title_short |
New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California |
title_full |
New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California |
title_fullStr |
New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California |
title_full_unstemmed |
New insights into productivity and redox-controlled trace element (Ag, Cd, Re, and Mo) accumulation in a 55 kyr long sediment record from Guaymas Basin, Gulf of California |
title_sort |
new insights into productivity and redox-controlled trace element (ag, cd, re, and mo) accumulation in a 55 kyr long sediment record from guaymas basin, gulf of california |
publisher |
Amer Geophysical Union |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00294/40566/39461.pdf https://archimer.ifremer.fr/doc/00294/40566/39462.doc https://archimer.ifremer.fr/doc/00294/40566/39463.pdf https://doi.org/10.1002/2014PA002681 https://archimer.ifremer.fr/doc/00294/40566/ |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2015-02 , Vol. 30 , N. 2 , P. 77-94 |
op_relation |
https://archimer.ifremer.fr/doc/00294/40566/39461.pdf https://archimer.ifremer.fr/doc/00294/40566/39462.doc https://archimer.ifremer.fr/doc/00294/40566/39463.pdf doi:10.1002/2014PA002681 https://archimer.ifremer.fr/doc/00294/40566/ |
op_rights |
2015. American Geophysical Union. All Rights Reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2014PA002681 |
container_title |
Paleoceanography |
container_volume |
30 |
container_issue |
2 |
container_start_page |
77 |
op_container_end_page |
94 |
_version_ |
1766019751914504192 |