Geochemistry and age model of sediment core BDP96-1
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2000
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| _version_ | 1867171383857905664 |
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| author | Müller, Jens Oberhänsli, Hedi Melles, Martin Schwab, Markus J Hubberten, Hans-Wolfgang |
| author_facet | Müller, Jens Oberhänsli, Hedi Melles, Martin Schwab, Markus J Hubberten, Hans-Wolfgang |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Within the framework of the Baikal Drilling Project (BDP), a 192 m long sediment core (BDP-96-1) was recovered from the Academician Ridge, a submerged topographic high between the North and Central Basins of Lake Baikal. Sedimentological, clay mineralogical and geochemical investigations were carried out on the core interval between 90 and 124 m depth, corresponding to ca. 2.4-3.4 Ma. The aim was to reconstruct the climatic and tectonic history of the continental region during the intensification of Northern Hemisphere glaciation in Late Pliocene time. A major climate change occurred in the Lake Baikal area at about 2.65 Ma. Enhanced physical weathering in the catchment, mirrored in the illite to smectite ratio, and temporarily reduced bioproduction in the lake, reflected by the diatom abundance, evidence a change towards a colder and more arid climate, probably associated with an intensification of the Siberian High. In addition, the coincident onset of distinct fluctuations in these parameters and in the Zr/Al ratio suggests the beginning of the Late Cenozoic high amplitude climate cycles at about 2.65 Ma. Fluctuations in the Zr/Al ratio are traced back to changes in the aeolian input, with high values in warmer, more humid phases due to a weaker Siberian High. Assuming that the sand content in the sediment reflects tectonic pulses, the Lake Baikal area was tectonically active during the entire investigated period, but in particular around 2.65 Ma. Tectonic movements have likely led to a gradual catchment change since about 3.15 Ma from the western towards the eastern lake surroundings, as indicated in the geochemistry and clay mineralogy of the sediments. The strong coincidence between tectonic and climatic changes in the Baikal area hints at the Himalayan uplift being one of the triggers for the Northern Hemisphere Glaciation. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_57017 |
| institution | PANGAEA |
| language | en |
| publishDate | 2000 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry and age model of sediment core BDP96-1 Müller, Jens Oberhänsli, Hedi Melles, Martin Schwab, Markus J Hubberten, Hans-Wolfgang Age model; Aluminium oxide; Baikal Drilling Project; Barium; BDP; BDP1996; BDP96-1; Calcium oxide; Cerium; Chlorite; Chlorite/standard ratio; Chromium; Cobalt; Copper; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Feldspar/standard ratio; Illite; Illite/standard ratio; Iron oxide, Fe2O3; Kaolinite; Kaolinite/standard ratio; Lake Baikal, Russia; Lead; Magnesium oxide; Manganese oxide; Molybdenum; Nickel; Niobium; Phosphorus pentoxide; Potassium oxide; Quartz/total intensity ratio; Rubidium; Sampling/drilling in lake; Silicon dioxide; Smectite; Smectite/standard ratio; Sodium oxide; Strontium; Thorium; Titanium dioxide; Uranium; Vanadium; X-ray diffraction TEXTUR, clay fraction; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium Within the framework of the Baikal Drilling Project (BDP), a 192 m long sediment core (BDP-96-1) was recovered from the Academician Ridge, a submerged topographic high between the North and Central Basins of Lake Baikal. Sedimentological, clay mineralogical and geochemical investigations were carried out on the core interval between 90 and 124 m depth, corresponding to ca. 2.4-3.4 Ma. The aim was to reconstruct the climatic and tectonic history of the continental region during the intensification of Northern Hemisphere glaciation in Late Pliocene time. A major climate change occurred in the Lake Baikal area at about 2.65 Ma. Enhanced physical weathering in the catchment, mirrored in the illite to smectite ratio, and temporarily reduced bioproduction in the lake, reflected by the diatom abundance, evidence a change towards a colder and more arid climate, probably associated with an intensification of the Siberian High. In addition, the coincident onset of distinct fluctuations in these parameters and in the Zr/Al ratio suggests the beginning of the Late Cenozoic high amplitude climate cycles at about 2.65 Ma. Fluctuations in the Zr/Al ratio are traced back to changes in the aeolian input, with high values in warmer, more humid phases due to a weaker Siberian High. Assuming that the sand content in the sediment reflects tectonic pulses, the Lake Baikal area was tectonically active during the entire investigated period, but in particular around 2.65 Ma. Tectonic movements have likely led to a gradual catchment change since about 3.15 Ma from the western towards the eastern lake surroundings, as indicated in the geochemistry and clay mineralogy of the sediments. The strong coincidence between tectonic and climatic changes in the Baikal area hints at the Himalayan uplift being one of the triggers for the Northern Hemisphere Glaciation. |
| title | Geochemistry and age model of sediment core BDP96-1 |
| topic | Age model; Aluminium oxide; Baikal Drilling Project; Barium; BDP; BDP1996; BDP96-1; Calcium oxide; Cerium; Chlorite; Chlorite/standard ratio; Chromium; Cobalt; Copper; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Feldspar/standard ratio; Illite; Illite/standard ratio; Iron oxide, Fe2O3; Kaolinite; Kaolinite/standard ratio; Lake Baikal, Russia; Lead; Magnesium oxide; Manganese oxide; Molybdenum; Nickel; Niobium; Phosphorus pentoxide; Potassium oxide; Quartz/total intensity ratio; Rubidium; Sampling/drilling in lake; Silicon dioxide; Smectite; Smectite/standard ratio; Sodium oxide; Strontium; Thorium; Titanium dioxide; Uranium; Vanadium; X-ray diffraction TEXTUR, clay fraction; X-ray fluorescence (XRF); Yttrium; Zinc; Zirconium |
| url | https://doi.org/10.1594/PANGAEA.57017 |