Salvato in:
| Autori principali: | , , , |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
2007
|
| Soggetti: | |
| Accesso online: | https://doi.org/10.1594/PANGAEA.628536 |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867167658991943680 |
|---|---|
| author | Hübner, Andreas de Lange, Gert J Dittmer, J Halbach, Peter |
| author_facet | Hübner, Andreas de Lange, Gert J Dittmer, J Halbach, Peter |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In a gravity core from the eastern Mediterranean Sea, a chemically and mineralogically distinct, 5.5-cm-thick layer is present above sapropel S-1 and overlain by hemipelagic marls. Calcite is completely absent in this exotic layer, dolomite is present only in small amounts, and the Cr concentrations are significantly enhanced. The layer was deposited primarily under reducing conditions, but the distributions of redox-sensitive elements show that a large part of the exotic layer is now oxidised by a downward-progressing oxidation front. Sediments from within the nearby anoxic, hypersaline Urania Basin are similar to those from the exotic layer, in particular in S-, C-, and O-isotope distributions of pyrite and dolomite, as well as increased Cr concentrations. Mud expulsion due to expansion of gas-rich mud is proposed to explain the presence of the exotic layer outside the Urania Basin. The deposition of an anoxic layer above S-1 shielded the sapropel from oxidation which resulted in the rare occurrence of a complete preservation of S-1 and provides the first minimum age for the start of anoxic mud accumulation in the Urania Basin. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_628536 |
| institution | PANGAEA |
| language | en |
| publishDate | 2007 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemical analysis of sediments from three coring sites in the Mediterranean Hübner, Andreas de Lange, Gert J Dittmer, J Halbach, Peter 3SL; 6SL; Gravity corer (Kiel type); M40/4; M40/4_4MC; M40/4_76-3; M40/4_76-6; MCUrania2; Mediterranean Sea, Urania Basin; Meteor (1986); MUC; MultiCorer; SESAME; SL; Southern European Seas: Assessing and Modelling Ecosystem Changes; Thermaikos Gulf In a gravity core from the eastern Mediterranean Sea, a chemically and mineralogically distinct, 5.5-cm-thick layer is present above sapropel S-1 and overlain by hemipelagic marls. Calcite is completely absent in this exotic layer, dolomite is present only in small amounts, and the Cr concentrations are significantly enhanced. The layer was deposited primarily under reducing conditions, but the distributions of redox-sensitive elements show that a large part of the exotic layer is now oxidised by a downward-progressing oxidation front. Sediments from within the nearby anoxic, hypersaline Urania Basin are similar to those from the exotic layer, in particular in S-, C-, and O-isotope distributions of pyrite and dolomite, as well as increased Cr concentrations. Mud expulsion due to expansion of gas-rich mud is proposed to explain the presence of the exotic layer outside the Urania Basin. The deposition of an anoxic layer above S-1 shielded the sapropel from oxidation which resulted in the rare occurrence of a complete preservation of S-1 and provides the first minimum age for the start of anoxic mud accumulation in the Urania Basin. |
| title | Geochemical analysis of sediments from three coring sites in the Mediterranean |
| topic | 3SL; 6SL; Gravity corer (Kiel type); M40/4; M40/4_4MC; M40/4_76-3; M40/4_76-6; MCUrania2; Mediterranean Sea, Urania Basin; Meteor (1986); MUC; MultiCorer; SESAME; SL; Southern European Seas: Assessing and Modelling Ecosystem Changes; Thermaikos Gulf |
| url | https://doi.org/10.1594/PANGAEA.628536 |