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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1982
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| Online Access: | https://doi.org/10.1594/PANGAEA.819121 |
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| _version_ | 1867171817523773440 |
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| author | Murray, David W Schrader, Hans-Jürgen |
| author_facet | Murray, David W Schrader, Hans-Jürgen |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Analysis of individual laminae in Recent sediments from the slopes of the Guaymas Basin indicates an increased abundance of the larger sizes (>60 µm) of Coscinodiscus nodulifer when upwelling conditions persist over the depositional site and an increase of the smaller sizes (<60 µm) when nonupwelling conditions exist. The size distributions of C. nodulifer in 10-cm composite samples from Hole 480 show a greater abundance of the large sizes (>60 µm) associated with well-laminated sections and more of the smaller sizes (<60 µm) in samples from the homogeneous sections. We have tentatively correlated the pronounced homogeneous zones with late Pleistocene glacial periods. These results indicate a persistence of nonupwelling conditions over Hole 480 during glacial periods (homogeneous zones) and a predominance of upwelling conditions during interglacial periods (laminated zones). Other evidence from diatom and silicoflagellate floral analysis seems to support these preliminary conclusions. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_819121 |
| institution | PANGAEA |
| language | en |
| publishDate | 1982 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Composite surface scraping samples and Coscinodiscus nodulifer abundance from DSDP Hole 64-480 Murray, David W Schrader, Hans-Jürgen 64-480; Coscinodiscus nodulifer; Deep Sea Drilling Project; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg64; North Pacific/Gulf of California/BASIN; Sample code/label; Smear slide analysis Analysis of individual laminae in Recent sediments from the slopes of the Guaymas Basin indicates an increased abundance of the larger sizes (>60 µm) of Coscinodiscus nodulifer when upwelling conditions persist over the depositional site and an increase of the smaller sizes (<60 µm) when nonupwelling conditions exist. The size distributions of C. nodulifer in 10-cm composite samples from Hole 480 show a greater abundance of the large sizes (>60 µm) associated with well-laminated sections and more of the smaller sizes (<60 µm) in samples from the homogeneous sections. We have tentatively correlated the pronounced homogeneous zones with late Pleistocene glacial periods. These results indicate a persistence of nonupwelling conditions over Hole 480 during glacial periods (homogeneous zones) and a predominance of upwelling conditions during interglacial periods (laminated zones). Other evidence from diatom and silicoflagellate floral analysis seems to support these preliminary conclusions. |
| title | (Table 1) Composite surface scraping samples and Coscinodiscus nodulifer abundance from DSDP Hole 64-480 |
| topic | 64-480; Coscinodiscus nodulifer; Deep Sea Drilling Project; Description; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Glomar Challenger; Leg64; North Pacific/Gulf of California/BASIN; Sample code/label; Smear slide analysis |
| url | https://doi.org/10.1594/PANGAEA.819121 |