Geochemistry on Holocene sediments from the Mediterranean
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2011
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| _version_ | 1867170459523481600 |
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| author | Möbius, Jürgen Lahajnar, Niko Emeis, Kay-Christian |
| author_facet | Möbius, Jürgen Lahajnar, Niko Emeis, Kay-Christian |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low d15N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to enhanced organic matter preservation under anoxic conditions. In order to evaluate these two hypothesis we have determined Ba/Al ratios, amino acid composition, N and organic C concentrations and d15N in sinking particles, surface sediments, eight spatially distributed core records of the youngest sapropel S1 (10-6 ka) and older sapropels (S5, S6) from two locations. These data suggest that (i) temporal and spatial variations in d15N of sedimentary N are driven by different degrees of diagenesis at different sites rather than by changes in N-sources or primary productivity and (ii) present day TOC export production would suffice to create a sapropel like S1 under conditions of deep-water anoxia. This implies that both enhanced TOC accumulation and d15N depletion in sapropels were due to the absence of oxygen in deep waters. Thus preservation plays a major role for the accumulation of organic-rich sediments casting doubt on the need of enhanced primary production for sapropel formation. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_758621 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry on Holocene sediments from the Mediterranean Möbius, Jürgen Lahajnar, Niko Emeis, Kay-Christian 101; 101-105; 106-111; 107; 111; 112-116; 116; 117-122; 118; 123-126; 137-139; 140-142; 143-148; 149-154; 155-162; 163-170; 171-179; 180-187; 188-194; 560; 561; 562; 563; 564; 565; 566; 569; 570; 571; 572; 573; 574; 575; 576; 577; 578; 579; 580; 581; 582; 584; 585; 586; 589; 590; 592; 594; 596; 599; 601; 602; 604; 666; 667; 668; 670; 671; 672; 673; 674; 676; 677; 678; 680; 681; 682; 683; 684; 685; 686; 687; 689; 690; 691; 692; 693; 694; 695; 696; 697; 699; 700; 701; 702; 703; 704; 705; 706; 707; 708; 709; 710; 712; 713; 714; 716; 717; 718; 719; 80; 82; 85; Cyprus; Eastern Mediterranean, Continental slope off Israel; Eratosthenes Seamount; Gargano Promontory; GeoB10701-4; GeoB10702-3; GeoB10703-3; GeoB10704-3; GeoB10705-3; GeoB10706-3; GeoB10707-4; GeoB10708-3; GeoB10710-4; GeoB10711-3; GeoB10712-3; GeoB10713-3; GeoB10714-3; GeoB10715-3; GeoB10716-3; GeoB10717-3; GeoB10718-3; GeoB10719-3; GeoB10720-5; GeoB10721-3; GeoB10722-3; GeoB10723-3; GeoB10724-3; GeoB10725-3; GeoB10726-3; GeoB10727-3; GeoB10728-3; GeoB10729-4; GeoB10730-3; GeoB10731-3; GeoB10732-3; GeoB10733-3; GeoB10734-3; GeoB10735-3; GeoB10736-3; GeoB10737-3; GeoB10738-3; GeoB10739-3; GeoB10740-3; GeoB10741-3; GeoB10742-3; GeoB10743-3; GeoB10744-3; GeoB10746-3; GeoB10747-3; GeoB10748-3; GeoB10749-3; GeoB7704-1; GeoB7705-1; GeoB7706-2; GeoB7714-1; GeoB7718-1; GeoB7720-1; GeoB7723-2; GeoB7725-2; Gravity corer (Kiel type); Greece; Gulf of Manfredonia; Gulf of Taranto; Haifa; Integrierte Analyse zwischeneiszeitlicher Klimadynamik; INTERDYNAMIK; Lybia; M40/4; M40/4_MUC65; M40/4_MUC66; M40/4_MUC67; M40/4_MUC68; M40/4_MUC69; M40/4_MUC70; M40/4_MUC71; M40/4_MUC72; M40/4_MUC73; M40/4_MUC74; M40/4_MUC75; M40/4_MUC76-2; M40/4_MUC76-3; M40/4_MUC77A; M40/4_MUC77B; M40/4_MUC78-2; M40/4_MUC79; M40/4_MUC81; M40/4_MUC82; M40/4_MUC84; M40/4_MUC85; M40/4_MUC86; M40/4_MUC87; M40/4_MUC88; M40/4_MUC89; M40/4_MUC90; M40/4_MUC91; M40/4_SL80; M51/3; M51/3_560-1; M51/3_561-4; M51/3_562-5; M51/3_563-5; M51/3_564-2; M51/3_565-1; M51/3_566-3; M51/3_569-3; M51/3_570-2; M51/3_571; M51/3_572-2; M51/3_573; M51/3_574-2; M51/3_575-6; M51/3_576-3; M51/3_577-1; M51/3_578; M51/3_579; M51/3_580; M51/3_581; M51/3_582; M51/3_584; M51/3_585; M51/3_586; M51/3_589; M51/3_590; M51/3_592; M51/3_594; M51/3_596; M51/3_599; M51/3_601-3; M51/3_602; M51/3_604; M52/2; M71/3; M71/3_H01; M71/3_H02; M71/3_H03; M71/3_H04; M71/3_H05; M71/3_H06; M71/3_H07; M71/3_H11; M71/3_H12; M71/3_Her01; M71/3_Her03; M71/3_ler01; M71/3_Rho02; M71/3_Sk01; Malta; Meteor (1986); MUC; MultiCorer; Nile Fan; POS339; Poseidon; SL; Strait of Otranto; Turkey; Zyprus The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low d15N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to enhanced organic matter preservation under anoxic conditions. In order to evaluate these two hypothesis we have determined Ba/Al ratios, amino acid composition, N and organic C concentrations and d15N in sinking particles, surface sediments, eight spatially distributed core records of the youngest sapropel S1 (10-6 ka) and older sapropels (S5, S6) from two locations. These data suggest that (i) temporal and spatial variations in d15N of sedimentary N are driven by different degrees of diagenesis at different sites rather than by changes in N-sources or primary productivity and (ii) present day TOC export production would suffice to create a sapropel like S1 under conditions of deep-water anoxia. This implies that both enhanced TOC accumulation and d15N depletion in sapropels were due to the absence of oxygen in deep waters. Thus preservation plays a major role for the accumulation of organic-rich sediments casting doubt on the need of enhanced primary production for sapropel formation. |
| title | Geochemistry on Holocene sediments from the Mediterranean |
| topic | 101; 101-105; 106-111; 107; 111; 112-116; 116; 117-122; 118; 123-126; 137-139; 140-142; 143-148; 149-154; 155-162; 163-170; 171-179; 180-187; 188-194; 560; 561; 562; 563; 564; 565; 566; 569; 570; 571; 572; 573; 574; 575; 576; 577; 578; 579; 580; 581; 582; 584; 585; 586; 589; 590; 592; 594; 596; 599; 601; 602; 604; 666; 667; 668; 670; 671; 672; 673; 674; 676; 677; 678; 680; 681; 682; 683; 684; 685; 686; 687; 689; 690; 691; 692; 693; 694; 695; 696; 697; 699; 700; 701; 702; 703; 704; 705; 706; 707; 708; 709; 710; 712; 713; 714; 716; 717; 718; 719; 80; 82; 85; Cyprus; Eastern Mediterranean, Continental slope off Israel; Eratosthenes Seamount; Gargano Promontory; GeoB10701-4; GeoB10702-3; GeoB10703-3; GeoB10704-3; GeoB10705-3; GeoB10706-3; GeoB10707-4; GeoB10708-3; GeoB10710-4; GeoB10711-3; GeoB10712-3; GeoB10713-3; GeoB10714-3; GeoB10715-3; GeoB10716-3; GeoB10717-3; GeoB10718-3; GeoB10719-3; GeoB10720-5; GeoB10721-3; GeoB10722-3; GeoB10723-3; GeoB10724-3; GeoB10725-3; GeoB10726-3; GeoB10727-3; GeoB10728-3; GeoB10729-4; GeoB10730-3; GeoB10731-3; GeoB10732-3; GeoB10733-3; GeoB10734-3; GeoB10735-3; GeoB10736-3; GeoB10737-3; GeoB10738-3; GeoB10739-3; GeoB10740-3; GeoB10741-3; GeoB10742-3; GeoB10743-3; GeoB10744-3; GeoB10746-3; GeoB10747-3; GeoB10748-3; GeoB10749-3; GeoB7704-1; GeoB7705-1; GeoB7706-2; GeoB7714-1; GeoB7718-1; GeoB7720-1; GeoB7723-2; GeoB7725-2; Gravity corer (Kiel type); Greece; Gulf of Manfredonia; Gulf of Taranto; Haifa; Integrierte Analyse zwischeneiszeitlicher Klimadynamik; INTERDYNAMIK; Lybia; M40/4; M40/4_MUC65; M40/4_MUC66; M40/4_MUC67; M40/4_MUC68; M40/4_MUC69; M40/4_MUC70; M40/4_MUC71; M40/4_MUC72; M40/4_MUC73; M40/4_MUC74; M40/4_MUC75; M40/4_MUC76-2; M40/4_MUC76-3; M40/4_MUC77A; M40/4_MUC77B; M40/4_MUC78-2; M40/4_MUC79; M40/4_MUC81; M40/4_MUC82; M40/4_MUC84; M40/4_MUC85; M40/4_MUC86; M40/4_MUC87; M40/4_MUC88; M40/4_MUC89; M40/4_MUC90; M40/4_MUC91; M40/4_SL80; M51/3; M51/3_560-1; M51/3_561-4; M51/3_562-5; M51/3_563-5; M51/3_564-2; M51/3_565-1; M51/3_566-3; M51/3_569-3; M51/3_570-2; M51/3_571; M51/3_572-2; M51/3_573; M51/3_574-2; M51/3_575-6; M51/3_576-3; M51/3_577-1; M51/3_578; M51/3_579; M51/3_580; M51/3_581; M51/3_582; M51/3_584; M51/3_585; M51/3_586; M51/3_589; M51/3_590; M51/3_592; M51/3_594; M51/3_596; M51/3_599; M51/3_601-3; M51/3_602; M51/3_604; M52/2; M71/3; M71/3_H01; M71/3_H02; M71/3_H03; M71/3_H04; M71/3_H05; M71/3_H06; M71/3_H07; M71/3_H11; M71/3_H12; M71/3_Her01; M71/3_Her03; M71/3_ler01; M71/3_Rho02; M71/3_Sk01; Malta; Meteor (1986); MUC; MultiCorer; Nile Fan; POS339; Poseidon; SL; Strait of Otranto; Turkey; Zyprus |
| url | https://doi.org/10.1594/PANGAEA.758621 |