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| Autori principali: | , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1982
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| Accesso online: | https://doi.org/10.1594/PANGAEA.819122 |
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| _version_ | 1867170963243663360 |
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| author | Crawford, Steve Schrader, Hans-Jürgen |
| author_facet | Crawford, Steve Schrader, Hans-Jürgen |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We examined the relative abundance of various components in the coarse fraction (> 150 µm) from a selected portion of the DSDP Site 480 piston core. The components consist mainly of diatoms, radiolarians, benthic and planktonic foraminifers with minor amounts of sponge spicules, terrigenous material, volcanic glass(?), dehydrated gypsum crystals, and spines of unknown biological origin. The examination shows that the siliceous organisms abound in the laminated sediments and that the calcareous organisms are more abundant in the nonlaminated sediments. Seasonal upwelling is responsible for the deposition of laminated sediments. The upwelling creates a strong oxygen-minimum zone, restricting the occurrence of burrowing benthic organisms and benthic foraminifers. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_819122 |
| institution | PANGAEA |
| language | en |
| publishDate | 1982 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Counts and ratios of microfossils at DSDP Hole 64-480 Crawford, Steve Schrader, Hans-Jürgen 64-480; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera, benthic; Foraminifera, planktic; Glomar Challenger; Leg64; North Pacific/Gulf of California/BASIN; Radiolarians; Ratio; Sample code/label; Wet sieving We examined the relative abundance of various components in the coarse fraction (> 150 µm) from a selected portion of the DSDP Site 480 piston core. The components consist mainly of diatoms, radiolarians, benthic and planktonic foraminifers with minor amounts of sponge spicules, terrigenous material, volcanic glass(?), dehydrated gypsum crystals, and spines of unknown biological origin. The examination shows that the siliceous organisms abound in the laminated sediments and that the calcareous organisms are more abundant in the nonlaminated sediments. Seasonal upwelling is responsible for the deposition of laminated sediments. The upwelling creates a strong oxygen-minimum zone, restricting the occurrence of burrowing benthic organisms and benthic foraminifers. |
| title | (Table 1) Counts and ratios of microfossils at DSDP Hole 64-480 |
| topic | 64-480; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera, benthic; Foraminifera, planktic; Glomar Challenger; Leg64; North Pacific/Gulf of California/BASIN; Radiolarians; Ratio; Sample code/label; Wet sieving |
| url | https://doi.org/10.1594/PANGAEA.819122 |