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| Main Authors: | , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2000
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| Online Access: | https://doi.org/10.1594/PANGAEA.738508 |
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| _version_ | 1867169500960391168 |
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| author | Martinez-Ruiz, Francisca C Kastner, Miriam Paytan, Adina Ortega-Huertas, M Bernasconi, Stefano M |
| author_facet | Martinez-Ruiz, Francisca C Kastner, Miriam Paytan, Adina Ortega-Huertas, M Bernasconi, Stefano M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The geochemistry of the youngest Mediterranean sapropel layer suggests changes in productivity and water column oxygen conditions during sapropel deposition. The Ba-enriched interval is broader than the organic-carbon-rich interval of this sapropel. We suggest that the Ba-enriched horizon records the original thickness of the sapropel prior to subsequent partial oxidation. The main carrier of Ba is barite, as microcrystals (0.5-5 µm ) having a morphology characteristic of marine barite, particularly abundant beneath high productivity regions. Ba concentrations do not change at the sapropel layer oxidation front and diagenetic barite crystals are absent, thus the Ba-enriched layer reflects original oceanic conditions of increased biological productivity during sapropel deposition and not diagenetic Ba remobilization. Paleoredox indicators point to restricted oxygenated bottom water but not to fully anoxic conditions. Detrital elements within this layer indicate a lower eolian terrigenous input, enhanced humidity, and increased precipitation/runoff, thus likely higher nutrient supply. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_738508 |
| institution | PANGAEA |
| language | en |
| publishDate | 2000 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry on sapropel deposition in the eastern Mediterranean from cores TTR-GL94 and M25/4-KL11 Martinez-Ruiz, Francisca C Kastner, Miriam Paytan, Adina Ortega-Huertas, M Bernasconi, Stefano M 25/4-11; GC; Gravity corer; KL; M25/4; M25/4-KL11; Mediterranean Sea; Meteor (1986); Piston corer (BGR type); TTR-GL94 The geochemistry of the youngest Mediterranean sapropel layer suggests changes in productivity and water column oxygen conditions during sapropel deposition. The Ba-enriched interval is broader than the organic-carbon-rich interval of this sapropel. We suggest that the Ba-enriched horizon records the original thickness of the sapropel prior to subsequent partial oxidation. The main carrier of Ba is barite, as microcrystals (0.5-5 µm ) having a morphology characteristic of marine barite, particularly abundant beneath high productivity regions. Ba concentrations do not change at the sapropel layer oxidation front and diagenetic barite crystals are absent, thus the Ba-enriched layer reflects original oceanic conditions of increased biological productivity during sapropel deposition and not diagenetic Ba remobilization. Paleoredox indicators point to restricted oxygenated bottom water but not to fully anoxic conditions. Detrital elements within this layer indicate a lower eolian terrigenous input, enhanced humidity, and increased precipitation/runoff, thus likely higher nutrient supply. |
| title | Geochemistry on sapropel deposition in the eastern Mediterranean from cores TTR-GL94 and M25/4-KL11 |
| topic | 25/4-11; GC; Gravity corer; KL; M25/4; M25/4-KL11; Mediterranean Sea; Meteor (1986); Piston corer (BGR type); TTR-GL94 |
| url | https://doi.org/10.1594/PANGAEA.738508 |