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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1993
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| Online Access: | https://doi.org/10.1594/PANGAEA.780453 |
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| author | Lange, Carina Beatriz Berger, Wolfgang H |
| author_facet | Lange, Carina Beatriz Berger, Wolfgang H |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We report on diatom abundance and preservation stratigraphy in the uppermost four cores of Ocean Drilling Program Hole 806B, which span the Quaternary period. Changes in diatom abundance and preservation show a rather complicated pattern, with much noise at high frequencies. However, in the cycles corresponding to eccentricity and obliquity variations, the picture is quite clear. Abundance and preservation follow glacial-interglacial cycles, with lowest abundances and poorest preservation observed in sediments that correspond to glacial stages. Seventy taxa compose the diatom assemblage of Hole 806B (from Samples 130-806B-1H-1, 8-9 cm, to -4H-7, 73-74 cm) with Azpeitia nodulifera as the dominant member. This species exhibits significant size variations related to glacial and interglacial stages during the Pleistocene. The distribution of power in the Fourier spectrum of the diatom signal (in the time domain) displays the expected Milankovitch frequencies (at 100,41, and 24-18 k.y.). It also shows concentration at various "odd" frequencies, especially at 62 k.y., suggesting a complicated response of productivity (and silicate chemistry) to climatic forcing. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_780453 |
| institution | PANGAEA |
| language | en |
| publishDate | 1993 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Diatom abundance and preservation in ODP Hole 130-806B samples Lange, Carina Beatriz Berger, Wolfgang H 130-806B; DEPTH, sediment/rock; Diatom abundance index; Diatom preservation index; Diatoms; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label We report on diatom abundance and preservation stratigraphy in the uppermost four cores of Ocean Drilling Program Hole 806B, which span the Quaternary period. Changes in diatom abundance and preservation show a rather complicated pattern, with much noise at high frequencies. However, in the cycles corresponding to eccentricity and obliquity variations, the picture is quite clear. Abundance and preservation follow glacial-interglacial cycles, with lowest abundances and poorest preservation observed in sediments that correspond to glacial stages. Seventy taxa compose the diatom assemblage of Hole 806B (from Samples 130-806B-1H-1, 8-9 cm, to -4H-7, 73-74 cm) with Azpeitia nodulifera as the dominant member. This species exhibits significant size variations related to glacial and interglacial stages during the Pleistocene. The distribution of power in the Fourier spectrum of the diatom signal (in the time domain) displays the expected Milankovitch frequencies (at 100,41, and 24-18 k.y.). It also shows concentration at various "odd" frequencies, especially at 62 k.y., suggesting a complicated response of productivity (and silicate chemistry) to climatic forcing. |
| title | (Table 1) Diatom abundance and preservation in ODP Hole 130-806B samples |
| topic | 130-806B; DEPTH, sediment/rock; Diatom abundance index; Diatom preservation index; Diatoms; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg130; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label |
| url | https://doi.org/10.1594/PANGAEA.780453 |