(Table 1) Geochemistry of Sapropels of the Mediterranean Sea
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1997
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| _version_ | 1867168100285153280 |
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| author | Passier, Hilde F Bosch, Hendrik-Jan Nijenhuis, Ivar A Lourens, Lucas Joost Böttcher, Michael Ernst Leenders, Anke Sinninghe Damsté, Jaap S de Lange, Gert J de Leeuw, Jan W |
| author_facet | Passier, Hilde F Bosch, Hendrik-Jan Nijenhuis, Ivar A Lourens, Lucas Joost Böttcher, Michael Ernst Leenders, Anke Sinninghe Damsté, Jaap S de Lange, Gert J de Leeuw, Jan W |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sapropels -organic-matter rich layers- are common in Neogene sediments of the eastern Mediterranean Sea. The formation of these layers has been attributed to climate-related increases in organic-matter production (Calvert et al., 1992, doi:10.1038/359223a0; Rossignol-Strick et al., 1982, doi:10.1038/295105a0; Rohling, 1994, doi:10.1016/0025-3227(94)90202-X) and increased organic-matter preservation due to oxygen depletion in more stagnant bottom waters (Rossignol-Strick et al., 1982, doi:10.1038/295105a0; Rohling, 1994, doi:10.1016/0025-3227(94)90202-X). Here we report that eastern Mediterranean Pliocene sapropels (Emeis et al., 1996, doi:10.2973/odp.proc.ir.160.102.1996) contain molecular fossils of a compound (isorenieratene) known to be synthesized by photosynthetic green sulphur bacteria, suggesting that sulphidic (euxinic) -and therefore anoxic- conditions prevailed in the photic zone of the water column. These sapropels also have a high trace-metal content, which is probably due to the efficient scavenging of these metals by precipitating sulphides in a euxinic water column. The abundance and sulphur-isotope composition of pyrite are consistent with iron sulphide formation in the water column. We conclude that basin-wide water-column euxinia occurred over substantial periods during Pliocene sapropel formation in the eastern Mediterranean Sea, and that the ultimate degradation of the increased organic-matter production was strongly influential in generating and sustaining the euxinic conditions. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_769873 |
| institution | PANGAEA |
| language | en |
| publishDate | 1997 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Geochemistry of Sapropels of the Mediterranean Sea Passier, Hilde F Bosch, Hendrik-Jan Nijenhuis, Ivar A Lourens, Lucas Joost Böttcher, Michael Ernst Leenders, Anke Sinninghe Damsté, Jaap S de Lange, Gert J de Leeuw, Jan W 160-964D; 160-964E; 160-966C; 160-967C; 160-969E; Accumulation rate, total organic carbon; AGE; Barium; Cadmium; Carbon, organic, total; Code; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eastern Basin; Enrichment factor; Event label; Isorenieratene derivative; Joides Resolution; Leg160; Molybdenum; Nickel; Ocean Drilling Program; ODP; Sample code/label; Selenium; Sulfur of pyrite; Vanadium; δ34S, pyrite Sapropels -organic-matter rich layers- are common in Neogene sediments of the eastern Mediterranean Sea. The formation of these layers has been attributed to climate-related increases in organic-matter production (Calvert et al., 1992, doi:10.1038/359223a0; Rossignol-Strick et al., 1982, doi:10.1038/295105a0; Rohling, 1994, doi:10.1016/0025-3227(94)90202-X) and increased organic-matter preservation due to oxygen depletion in more stagnant bottom waters (Rossignol-Strick et al., 1982, doi:10.1038/295105a0; Rohling, 1994, doi:10.1016/0025-3227(94)90202-X). Here we report that eastern Mediterranean Pliocene sapropels (Emeis et al., 1996, doi:10.2973/odp.proc.ir.160.102.1996) contain molecular fossils of a compound (isorenieratene) known to be synthesized by photosynthetic green sulphur bacteria, suggesting that sulphidic (euxinic) -and therefore anoxic- conditions prevailed in the photic zone of the water column. These sapropels also have a high trace-metal content, which is probably due to the efficient scavenging of these metals by precipitating sulphides in a euxinic water column. The abundance and sulphur-isotope composition of pyrite are consistent with iron sulphide formation in the water column. We conclude that basin-wide water-column euxinia occurred over substantial periods during Pliocene sapropel formation in the eastern Mediterranean Sea, and that the ultimate degradation of the increased organic-matter production was strongly influential in generating and sustaining the euxinic conditions. |
| title | (Table 1) Geochemistry of Sapropels of the Mediterranean Sea |
| topic | 160-964D; 160-964E; 160-966C; 160-967C; 160-969E; Accumulation rate, total organic carbon; AGE; Barium; Cadmium; Carbon, organic, total; Code; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eastern Basin; Enrichment factor; Event label; Isorenieratene derivative; Joides Resolution; Leg160; Molybdenum; Nickel; Ocean Drilling Program; ODP; Sample code/label; Selenium; Sulfur of pyrite; Vanadium; δ34S, pyrite |
| url | https://doi.org/10.1594/PANGAEA.769873 |