Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation
18 pages, 10 figures, 5 tables, supplementary material https://doi.org/10.1016/j.gca.2021.04.021
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2021-07
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| Subjects: | 210Pb, Sediment accumulation rates, Biogeochemistry, Antarctic Peninsula, Organic carbon, Biogenic silica, |
| Online Access: | http://hdl.handle.net/10261/244437 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100011033 |
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dig-icm-es-10261-2444372022-08-16T06:34:46Z Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation Isla, Enrique DeMaster, D.J. Ministerio de Economía y Competitividad (España) Agencia Estatal de Investigación (España) 210Pb Sediment accumulation rates Biogeochemistry Antarctic Peninsula Organic carbon Biogenic silica 18 pages, 10 figures, 5 tables, supplementary material https://doi.org/10.1016/j.gca.2021.04.021 Burial fluxes of organic carbon and biogenic silica were determined in 17 continental shelf sediment cores collected from the northern Weddell Sea, the Bransfield Strait, and the southern Drake Passage. Coring sites included open-shelf stations as well as slope and glacial trough environments, with water depths varying from 220 to 760 m. Apparent 210Pb accumulation rates from these cores ranged from 0.04 g m−2y−1 to 0.21 g m−2y−1 (1 to 3 mm y−1), with organic carbon burial rates ranging from 3 to 15 g OC m−2y−1 and biogenic silica accumulation rates ranging from 15 to 126 g SiO2 m−2y−1. OC contents below the surface mixed layer ranged from 0.26 to 1.51 wt. % (avg. 0.64 %). Biogenic silica contents at depth ranged from 2.3 to 11.2 wt. % (avg. 7.5%), with an average bSi/OC ratio (wt. %/wt. %) at depth of 12. Annual OC primary production rates and biogenic silica production rates in the euphotic zone were estimated from satellite chlorophyll-a data in the literature and from a seasonal model for biogenic particle export from surface waters. Based on these biogeochemical data, preservation efficiencies (i.e., mass burial rate/water column production rate) were calculated for organic carbon and biogenic silica. These preservation efficiency values ranged from 2 to 18% (avg. 9%) for OC and 8 to 106% (avg. 54%) for bSi. These relatively high preservation efficiencies resulted from extensive lateral sediment focusing (210Pb Psi (Ψ) values [burial flux/water column production rate] ranging from 2 to 33; avg. of 16), cold bottom water temperatures (2 to −2°C), and relatively high biogenic Si and OC production rates in the euphotic zone. The enhanced preservation efficiency for bSi relative to OC (i.e., 54% vs. 9%) in these Antarctic settings is consistent with the change in the phytoplankton bSi/OC (wt. %/wt. %) value of 2 for this area to the burial bSi/OC value of 12. Excess 210Pb activities in surface sediments varied from 4 to 47 dpm g−1. The surface mixed layer in the seabed varied in thickness from 0 to 4 cm. The penetration of excess 210Pb into these Antarctic Peninsula sediments varied from 6 to 28 cm (avg. 18 cm). The inventory of excess 210Pb in the seabed varied from 13 to 230 dpm cm−2 (avg. 110 dpm cm−2). Although 210Pb was the only radionuclide measured in this study, “apparent” 210Pb sediment accumulation rate (SAR) values from these 17 cores (assuming that deep bioturbation is negligible) are believed to be accurate SAR values because of good agreement between 210Pb and 14C chronologies from nearby cores reported in the literature This work was funded by the Spanish Ministry of Economy and Competitiveness as part of the project ECOWED (CTM2012-39350-C02-01) With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S) Peer reviewed 2021-06-23T08:11:09Z 2021-06-23T08:11:09Z 2021-07 artículo http://purl.org/coar/resource_type/c_6501 Geochimica et Cosmochimica Acta 304: 50-67 (2021) 0016-7037 CEX2019-000928-S http://hdl.handle.net/10261/244437 10.1016/j.gca.2021.04.021 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100011033 en Postprint https://doi.org/10.1016/j.gca.2021.04.021 Sí embargo_20240731 Elsevier Meteoritical Society |
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210Pb Sediment accumulation rates Biogeochemistry Antarctic Peninsula Organic carbon Biogenic silica 210Pb Sediment accumulation rates Biogeochemistry Antarctic Peninsula Organic carbon Biogenic silica |
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210Pb Sediment accumulation rates Biogeochemistry Antarctic Peninsula Organic carbon Biogenic silica 210Pb Sediment accumulation rates Biogeochemistry Antarctic Peninsula Organic carbon Biogenic silica Isla, Enrique DeMaster, D.J. Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| description |
18 pages, 10 figures, 5 tables, supplementary material https://doi.org/10.1016/j.gca.2021.04.021 |
| author2 |
Ministerio de Economía y Competitividad (España) |
| author_facet |
Ministerio de Economía y Competitividad (España) Isla, Enrique DeMaster, D.J. |
| format |
artículo |
| topic_facet |
210Pb Sediment accumulation rates Biogeochemistry Antarctic Peninsula Organic carbon Biogenic silica |
| author |
Isla, Enrique DeMaster, D.J. |
| author_sort |
Isla, Enrique |
| title |
Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| title_short |
Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| title_full |
Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| title_fullStr |
Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| title_full_unstemmed |
Biogenic matter content in marine sediments in the vicinity of the Antarctic Peninsula: Recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| title_sort |
biogenic matter content in marine sediments in the vicinity of the antarctic peninsula: recent sedimentary conditions under a diverse environment of production, transport, selective preservation and accumulation |
| publisher |
Elsevier |
| publishDate |
2021-07 |
| url |
http://hdl.handle.net/10261/244437 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100011033 |
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