Clay mineralogy and sedimentology of coring Site BDP93-2 in Lake Baikal
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2005
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| _version_ | 1867167689547448320 |
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| author | Yuretich, Richard Melles, Martin Sarata, Brenn Grobe, Hannes |
| author_facet | Yuretich, Richard Melles, Martin Sarata, Brenn Grobe, Hannes |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Lake Baikal, in south-central Siberia, has been the focus of an international effort (the Baikal Drilling Project; BDP) to obtain continuous long cores (upwards of 100 m) from this unique rift-valley lake and to interpret the paleoclimatic history from various proxy data. As part of this effort, the clay minerals were examined by two research teams. A consistent clay-mineral assemblage, containing illite, interstratified illite-smectite, chlorite, and kaolinite as the major minerals, characterizes much of the modern sediments. The relative abundance of these minerals changes with depth in both short piston cores from various parts of the lake and in 100-m-long cores taken from the distal toe of the Selenga Delta (BDP-93). Independent analyses of the abundance changes and correlation with other data from the cores show that the clays are responding to two influences: (1) climatic fluctuations, particularly in the upper 40 m of the sedimentary record, which show the relative amount of illite-smectite (and sometimes kaolinite) increasing during warmer climate episodes, and (2) source-area changes, which are most evident below 40 m in the BDP-93 cores and mark a shift from an eastern (Buguldeika River) to a western (Selenga River) source. The clay-mineral-based climate fluctuations are correlative with the marine oxygen-isotope record through stage 7, and provide a relatively simple and cost-effective tool for gaining insight into the paleoclimate of this interior continental site. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_56129 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Clay mineralogy and sedimentology of coring Site BDP93-2 in Lake Baikal Yuretich, Richard Melles, Martin Sarata, Brenn Grobe, Hannes Amphibole/standard ratio; Baikal Drilling Project; BDP; BDP1993; BDP93-2; Calcium carbonate; Carbon, organic, total; Chlorite; Chlorite/standard ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Element analyser CHN; Feldspar/standard ratio; Illite; Illite/standard ratio; Kaolinite; Kaolinite/standard ratio; Lake Baikal, Russia; Nitrogen, total; Quartz/standard ratio; Sampling/drilling in lake; Sand; Silt; Size fraction < 0.002 mm, clay; Smectite; Smectite/standard ratio; X-ray diffraction TEXTUR, clay fraction; δ13C, organic carbon Lake Baikal, in south-central Siberia, has been the focus of an international effort (the Baikal Drilling Project; BDP) to obtain continuous long cores (upwards of 100 m) from this unique rift-valley lake and to interpret the paleoclimatic history from various proxy data. As part of this effort, the clay minerals were examined by two research teams. A consistent clay-mineral assemblage, containing illite, interstratified illite-smectite, chlorite, and kaolinite as the major minerals, characterizes much of the modern sediments. The relative abundance of these minerals changes with depth in both short piston cores from various parts of the lake and in 100-m-long cores taken from the distal toe of the Selenga Delta (BDP-93). Independent analyses of the abundance changes and correlation with other data from the cores show that the clays are responding to two influences: (1) climatic fluctuations, particularly in the upper 40 m of the sedimentary record, which show the relative amount of illite-smectite (and sometimes kaolinite) increasing during warmer climate episodes, and (2) source-area changes, which are most evident below 40 m in the BDP-93 cores and mark a shift from an eastern (Buguldeika River) to a western (Selenga River) source. The clay-mineral-based climate fluctuations are correlative with the marine oxygen-isotope record through stage 7, and provide a relatively simple and cost-effective tool for gaining insight into the paleoclimate of this interior continental site. |
| title | Clay mineralogy and sedimentology of coring Site BDP93-2 in Lake Baikal |
| topic | Amphibole/standard ratio; Baikal Drilling Project; BDP; BDP1993; BDP93-2; Calcium carbonate; Carbon, organic, total; Chlorite; Chlorite/standard ratio; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Element analyser CHN; Feldspar/standard ratio; Illite; Illite/standard ratio; Kaolinite; Kaolinite/standard ratio; Lake Baikal, Russia; Nitrogen, total; Quartz/standard ratio; Sampling/drilling in lake; Sand; Silt; Size fraction < 0.002 mm, clay; Smectite; Smectite/standard ratio; X-ray diffraction TEXTUR, clay fraction; δ13C, organic carbon |
| url | https://doi.org/10.1594/PANGAEA.56129 |