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Mao, Shaozhi; Wise, Sherwood W (1994): Late Quaternary calcareous nannofossils in ODP Leg 139 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.820678, Supplement to: Mao, S; Wise, SW (1994): Late Quaternary Calcareous Nannofossils from the Sedimented Middle Valley of the Juan de Fuca Ridge, Leg 139. In: Mottl, MJ; Davis, EE; Fisher, AT; Slack, JF (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 139, 59-76, https://doi.org/10.2973/odp.proc.sr.139.208.1994

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Abstract:
Upper Quaternary calcareous nannofossils contained in drill cores taken in the heavily sedimented Middle Valley of the northern Juan de Fuca Ridge in the northeast Pacific Ocean (Ocean Drilling Program Leg 139) are investigated. The host sediments have been subjected at depth to high temperatures and hot hydrothermal fluids that have altered or destroyed in part or in toto the nannofossil assemblages, thereby raising at several sites the level of the first (deepest) stratigraphic occurrence of nannofossils or of the important Emiliania huxleyi datum. The degree of alteration of the nannofossil assemblages is dependent on the intensity of the hydrothermal activity, which is indicated by paleotemperatures derived independently from studies of color alteration of palynomorphs and by vitrinite reflectance (Mao et al., this volume). State of preservation and the downhole level at which assemblages have been destroyed correlate well with the inferred paleotemperature estimates. Destruction of the assemblages appears to be species selective and follows in general the dissolution rankings determined independently by others for Recent nannofossils of the Pacific basin. More systematic correlation of these phenomena is hampered, however, by the fact that nannofossil preservation is already quite variable at the time of deposition because of the predominance of turbidite activity in the study area.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 48.445117 * Median Longitude: -128.679808 * South-bound Latitude: 48.436700 * West-bound Longitude: -128.713000 * North-bound Latitude: 48.456900 * East-bound Longitude: -128.637000
Date/Time Start: 1991-07-14T20:30:00 * Date/Time End: 1991-08-15T08:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Mao, S; Wise, SW (1994): (Table 3) Distribution of calcareous nannofossils in ODP Hole 139-855A. https://doi.org/10.1594/PANGAEA.820670
  2. Mao, S; Wise, SW (1994): (Table 4) Distribution of calcareous nannofossils in ODP Hole 139-855B. https://doi.org/10.1594/PANGAEA.820671
  3. Mao, S; Wise, SW (1994): (Table 5) Distribution of calcareous nannofossils in ODP Hole 139-855C. https://doi.org/10.1594/PANGAEA.820672
  4. Mao, S; Wise, SW (1994): (Table 6) Distribution of calcareous nannofossils in ODP Hole 139-856A. https://doi.org/10.1594/PANGAEA.820673
  5. Mao, S; Wise, SW (1994): (Table 7) Distribution of calcareous nannofossils in ODP Hole 139-857A. https://doi.org/10.1594/PANGAEA.820674
  6. Mao, S; Wise, SW (1994): (Table 8) Distribution of calcareous nannofossils in ODP Hole 139-857C. https://doi.org/10.1594/PANGAEA.820675
  7. Mao, S; Wise, SW (1994): (Table 10) Distribution of calcareous nannofossils in ODP Site 139-858. https://doi.org/10.1594/PANGAEA.820677
  8. Mao, S; Wise, SW (1994): (Table 9) Distribution of calcareous nannofossils in ODP Hole 139-858A. https://doi.org/10.1594/PANGAEA.820676