Kaolinite/Chlorite ratio of sediment core GeoTü SL143
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2013
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| _version_ | 1867170030001586176 |
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| author | Ehrmann, Werner Seidel, Martin Schmiedl, Gerhard |
| author_facet | Ehrmann, Werner Seidel, Martin Schmiedl, Gerhard |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The ratio between the clay minerals kaolinite and chlorite has been investigated in high resolution in a late Quaternary sediment core from the central Aegean Sea. The record spans the last ca. 105 ka. The kaolinite/chlorite ratio was used to reconstruct the fine-grained aeolian dust influx from the North African deserts, mainly derived from desiccated lake depressions. It therewith can be used as a proxy for wind activity, aridity and vegetation cover in the source area. The data document three major humid phases in North Africa bracketing the formation of sapropel layers S4, S3 and S1. They occur at >105-95 ka, 83.5-72 ka and 14-2 ka. The first two phases are characterised by relatively abrupt lower and upper boundaries suggesting a non-linear response of vegetation to precipitation, with critical hydrological thresholds. In contrast, the onset and termination of the last humid period were more gradual. Highest kaolinite/chlorite ratios indicating strongest aeolian transport and aridity occur during Marine Isotope Stage (MIS) 5b, at ca. 95-84 ka. The long-term decrease in kaolinite/chlorite ratios during the last glacial period indicates a gradual decline of deflatable lake sediments in the source areas. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_810743 |
| institution | PANGAEA |
| language | en |
| publishDate | 2013 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Kaolinite/Chlorite ratio of sediment core GeoTü SL143 Ehrmann, Werner Seidel, Martin Schmiedl, Gerhard Aegean Sea; AGE; Calculated; DEPTH, sediment/rock; GeoTu_SL143; GeoTü SL143; Gravity corer (Kiel type); Kaolinite/Chlorite ratio; SL The ratio between the clay minerals kaolinite and chlorite has been investigated in high resolution in a late Quaternary sediment core from the central Aegean Sea. The record spans the last ca. 105 ka. The kaolinite/chlorite ratio was used to reconstruct the fine-grained aeolian dust influx from the North African deserts, mainly derived from desiccated lake depressions. It therewith can be used as a proxy for wind activity, aridity and vegetation cover in the source area. The data document three major humid phases in North Africa bracketing the formation of sapropel layers S4, S3 and S1. They occur at >105-95 ka, 83.5-72 ka and 14-2 ka. The first two phases are characterised by relatively abrupt lower and upper boundaries suggesting a non-linear response of vegetation to precipitation, with critical hydrological thresholds. In contrast, the onset and termination of the last humid period were more gradual. Highest kaolinite/chlorite ratios indicating strongest aeolian transport and aridity occur during Marine Isotope Stage (MIS) 5b, at ca. 95-84 ka. The long-term decrease in kaolinite/chlorite ratios during the last glacial period indicates a gradual decline of deflatable lake sediments in the source areas. |
| title | Kaolinite/Chlorite ratio of sediment core GeoTü SL143 |
| topic | Aegean Sea; AGE; Calculated; DEPTH, sediment/rock; GeoTu_SL143; GeoTü SL143; Gravity corer (Kiel type); Kaolinite/Chlorite ratio; SL |
| url | https://doi.org/10.1594/PANGAEA.810743 |