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  • 104-642C; 104-642D; 104-643A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP  (2)
  • PANGAEA  (2)
  • American Chemical Society (ACS)
  • 1985-1989  (2)
Collection
Keywords
Publisher
  • PANGAEA  (2)
  • American Chemical Society (ACS)
Years
  • 1985-1989  (2)
Year
  • 1
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    Unknown
    Neogene magneto- and biostratigraphy of ODP Leg 104 holes (1989)
    PANGAEA
    In:  Supplement to: Ciesielski, Paul F; Case, Susan M (1989): Neogene paleoceanography of the Norwegian Sea based upon silicoflagellate assemblage changes in ODP Leg 104 sedimentary sequences. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 527-541, https://doi.org/10.2973/odp.proc.sr.104.166.1989
    Details
    Publication Date: 2024-01-09
    Description: Silicoflagellate assemblages of ODP Leg 104 Neogene sequences are the basis of an interpretation of changes in the Neogene paleoenvironment of the Norwegian Sea. Fluctuations in the percentages of temperature and nutrient-sensitive taxonomic groups document major changes in sea-surface conditions. A brief, but distinct, cooling event occurred at 18.0-17.5 Ma which resulted in the disappearance of Naviculopsis. Following this early Miocene cooling a long period of increasing surface-water temperature occurred, leading up to a thermal high in the early middle Miocene (14.0 Ma). The early late Miocene (10.0-9.0 Ma) was distinctly cooler than the middle Miocene, but warmer than the remainder of the Neogene. Conditions between 13.0 and 10.0 Ma are unrecorded because of a regional hiatus, which is the earliest evidence for an end to the more temperate and stable conditions of the early to middle middle Miocene. A major plunge in temperatures occurred between 8.5 and 7.4 Ma and during the remainder of the late Miocene and Pliocene; from 7.4 to 2.65 Ma subpolar conditions prevailed. Silicoflagellates disappeared, except for sporadic occurrences, at 2.64 Ma with the beginning of dominant glacial sedimentation. Biogenic opal is absent in sediments younger than 0.76 Ma, indicating the dominance of glacial conditions with extensive sea ice.
    Keywords: 104-642C; 104-642D; 104-643A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Dinoflagellates of ODP Leg 104 holes (1989)
    PANGAEA
    In:  Supplement to: Manum, Svein B; Boulter, M C; Gunnarsdottir, H; Rangnes, K; Scholze, A (1989): Eocene to Miocene palynology of the Norwegian Sea (ODP Leg 104). In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 611-662, https://doi.org/10.2973/odp.proc.sr.104.176.1989
    Details
    Publication Date: 2024-01-09
    Description: Dinoflagellate cysts, pollen, and spores were studied from 78 samples of the Eocene to Miocene section of ODP Site 643 at the outer Wring Plateau. Dinoflagellate cysts ranging from less than 1,000 to rarely over 30,000 per gram of sediment in the Paleogene, and generally between 50,000 and 100,000 in the Miocene were present. The shift to conspicuously higher cyst frequencies takes place in the lowermost Miocene section and appears to reflect increased cyst recruitment rather than a change in sedimentation rate. Of the 179 dinoflagellate cyst forms whose ranges were recorded, 129 are known species. Fifteen assemblage zones have been recognized, although the upper Eocene is missing and no substantial lower Eocene was recorded at Site 643. Norwegian Sea and Rockall Plateau zonations were compared with this study. Detailed correlation with existing onshore section zonations was difficult because key zonal species are inadequately represented; however, the middle to upper Miocene zonation established for Denmark is applicable. Pollen and spores occur with relatively low frequencies, and palynodebris is generally absent, in contrast to the observations from DSDP Leg 38. Thirty-nine samples from Eocene to Miocene sediments at Site 642 were studied and correlated with Site 643. A lower Eocene cyst assemblage present in Hole 642D is older than the questionably lower Eocene assemblage from Site 643. Site 642 has a lower Eocene to lower Miocene hiatus.
    Keywords: 104-642C; 104-642D; 104-643A; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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