Geochemistry of surface sediment cores
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PANGAEA
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| Autores principales: | , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
2001
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| _version_ | 1867167688668741632 |
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| author | Klump, Jens Hebbeln, Dierk Wefer, Gerold |
| author_facet | Klump, Jens Hebbeln, Dierk Wefer, Gerold |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | High concentrations of barium have been found in sediments deposited on the Chilean continental slope after glacial Termination I. When compared to independent proxies of paleoproductivity, the pattern of biogenic barium accumulation does not match the changes in paleoproductivity in this region and cannot be explained by changes in the terrigenous supply of barium alone. This leaves an increased concentration of dissolved barium in sea water as the most likely cause of the observed barium anomalies. Based upon the accumulation rate of biogenic barium and the paleoproductivity index, which was calculated from the accumulation rates of organic carbon, biogenic opal and carbonate, the changes in the concentration of dissolved barium in the Pacific Ocean in the course of the last glacial and through the Holocene could be modelled. This model shows that barium concentrations in the Pacific during the last glacial were comparable to today (150 nmol/kg). The highest dissolved barium concentrations were calculated for the Early and Middle Holocene (190 nmol/kg). The resulting pattern of variations in the barium concentration in the seawater agrees well with Ba/Ca ratios in benthic foraminifera published in the literature. The observed changes are probably driven by the Holocene shoaling of the Pacific carbonate compensation depth, which is assumed to have caused an increased flux of previously carbonate-bound barium from the sediment to the deep ocean waters, leading to the observed longstanding maximum of dissolved barium in the Pacific during the Holocene. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_55542 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of surface sediment cores Klump, Jens Hebbeln, Dierk Wefer, Gerold Aluminium; Barium; Barium, biogenic; Barium, terrigenous; Barium/Aluminium ratio; BC; Box corer; Calculated; Carbon, organic, total; Carbon/Nitrogen ratio; Carbon in carbonate; Chile; ChileRiver; CHIPAL; CINCA; CONDOR-Ia; CTD/Rosette; CTD-RO; DEPTH, sediment/rock; Element analyser CHN; Elevation of event; Event label; GeoB; GeoB3301-1; GeoB3302-2; GeoB3303-1; GeoB3304-3; GeoB3305-2; GeoB3308-3; GeoB3311-2; GeoB3312-2; GeoB3313-3; GeoB3314-1; GeoB3316-1; GeoB3317-6; GeoB3318-2; GeoB3323-4; GeoB3349-4; GeoB3352-2; GeoB3353-1; GeoB3354-1; GeoB3357-1; GeoB3359-1; GeoB3365-1; GeoB3373-1; GeoB3374-1; GeoB3375-2; GeoB3376-2; GeoB3377-1; GeoB3378-1; Geosciences, University of Bremen; Gravity corer (Kiel type); HAND; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Iron; Iron/Aluminium ratio; KL; Latitude of event; Longitude of event; Manganese; MUC; MultiCorer; off Chile; Piston corer (BGR type); RCH1; RCH10; RCH11; RCH12; RCH13; RCH14; RCH2; RCH3; RCH4; RCH5; RCH6; RCH7; RCH8; RCH9; Sampling by hand; Sampling on land; SL; SO101; SO101/3_1-1; SO101/3_2-2; SO101/3_3-1; SO102/1; SO102/2; SO104/3; SO104/3_13KL; SO104/3_17KL; SO104/3_25KL; SO104/3_31KL; SO104/3_44KL; SO104/3_45KL; SO104/3_52KL; Sonne; South-East Pacific; Thioploca; Thioploca_C10; Thioploca_C13; Thioploca_C14; Thioploca_C18; Thioploca_C2; Thioploca_C21; Thioploca_C26; Thioploca_C32; Thioploca_C34; Thioploca_C36; Thioploca_C4; Thioploca_C40; Thioploca_C6; Thioploca_C7; Thioploca_C9; Titanium; Vidal Gormaz High concentrations of barium have been found in sediments deposited on the Chilean continental slope after glacial Termination I. When compared to independent proxies of paleoproductivity, the pattern of biogenic barium accumulation does not match the changes in paleoproductivity in this region and cannot be explained by changes in the terrigenous supply of barium alone. This leaves an increased concentration of dissolved barium in sea water as the most likely cause of the observed barium anomalies. Based upon the accumulation rate of biogenic barium and the paleoproductivity index, which was calculated from the accumulation rates of organic carbon, biogenic opal and carbonate, the changes in the concentration of dissolved barium in the Pacific Ocean in the course of the last glacial and through the Holocene could be modelled. This model shows that barium concentrations in the Pacific during the last glacial were comparable to today (150 nmol/kg). The highest dissolved barium concentrations were calculated for the Early and Middle Holocene (190 nmol/kg). The resulting pattern of variations in the barium concentration in the seawater agrees well with Ba/Ca ratios in benthic foraminifera published in the literature. The observed changes are probably driven by the Holocene shoaling of the Pacific carbonate compensation depth, which is assumed to have caused an increased flux of previously carbonate-bound barium from the sediment to the deep ocean waters, leading to the observed longstanding maximum of dissolved barium in the Pacific during the Holocene. |
| title | Geochemistry of surface sediment cores |
| topic | Aluminium; Barium; Barium, biogenic; Barium, terrigenous; Barium/Aluminium ratio; BC; Box corer; Calculated; Carbon, organic, total; Carbon/Nitrogen ratio; Carbon in carbonate; Chile; ChileRiver; CHIPAL; CINCA; CONDOR-Ia; CTD/Rosette; CTD-RO; DEPTH, sediment/rock; Element analyser CHN; Elevation of event; Event label; GeoB; GeoB3301-1; GeoB3302-2; GeoB3303-1; GeoB3304-3; GeoB3305-2; GeoB3308-3; GeoB3311-2; GeoB3312-2; GeoB3313-3; GeoB3314-1; GeoB3316-1; GeoB3317-6; GeoB3318-2; GeoB3323-4; GeoB3349-4; GeoB3352-2; GeoB3353-1; GeoB3354-1; GeoB3357-1; GeoB3359-1; GeoB3365-1; GeoB3373-1; GeoB3374-1; GeoB3375-2; GeoB3376-2; GeoB3377-1; GeoB3378-1; Geosciences, University of Bremen; Gravity corer (Kiel type); HAND; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Iron; Iron/Aluminium ratio; KL; Latitude of event; Longitude of event; Manganese; MUC; MultiCorer; off Chile; Piston corer (BGR type); RCH1; RCH10; RCH11; RCH12; RCH13; RCH14; RCH2; RCH3; RCH4; RCH5; RCH6; RCH7; RCH8; RCH9; Sampling by hand; Sampling on land; SL; SO101; SO101/3_1-1; SO101/3_2-2; SO101/3_3-1; SO102/1; SO102/2; SO104/3; SO104/3_13KL; SO104/3_17KL; SO104/3_25KL; SO104/3_31KL; SO104/3_44KL; SO104/3_45KL; SO104/3_52KL; Sonne; South-East Pacific; Thioploca; Thioploca_C10; Thioploca_C13; Thioploca_C14; Thioploca_C18; Thioploca_C2; Thioploca_C21; Thioploca_C26; Thioploca_C32; Thioploca_C34; Thioploca_C36; Thioploca_C4; Thioploca_C40; Thioploca_C6; Thioploca_C7; Thioploca_C9; Titanium; Vidal Gormaz |
| url | https://doi.org/10.1594/PANGAEA.55542 |