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Thiébault, Francois; Cremer, Michel; Debrabant, Pierre; Foulon, J; Nielsen, Ole Bjorslev; Zimmerman, Herman (1989): Geochemistry of Neogene-Quaternary sediments in ODP Site 105-645 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745176, Supplement to: Thiébault, F et al. (1989): Analysis of sedimentary facies, clay mineralogy, and geochemistry of the Neogene-Quaternary sediments in ODP Site 645, Baffin Bay. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 83-100, https://doi.org/10.2973/odp.proc.sr.105.111.1989

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Abstract:
Subcontinuously cored early(?)-middle Miocene to recently deposited sediments from ODP Site 645 were studied texturally, mineralogically, and geochemically. The entire sequence contains minerals and associated chemical elements that are chiefly of detrital origin. In particular, the clay minerals, which include smectite, kaolinite, chlorite, and illite, are detrital. No obvious evidence of diagenesis with depth, of burial, of volcanism, or of hydrothermal alteration was observed.
The sedimentary textures, clay mineralogy, and <2-µm fraction geochemistry of the early middle Miocene sediments (630 to 1147 mbsf) suggest the pronounced but variable influence of a southward bottom current. Two clay facies are defined. The lower one, Cj (780 to 1147 mbsf), is characterized by the great abundance of discrete smectite (with less than 15% illite interlayers), probably detrital in origin, and reworked older, discrete, smectite-rich sediments. The upper clay facies, C2 (630 to 780 mbsf), shows a net decrease of the fully expandable clay abundances, with a great abundance of mixed-layer, illite-smectite clays (60 to 80% of illite interlayers). Such clay assemblages can be inherited from paleosoils or older sedimentary rocks.
An important change occurs at 630 mbsf (clay fraction) or 600 mbsf (sedimentary texture), which may be explained by the beginning of continental glaciation (630 mbsf, ~9 Ma) and the onset of ice rafting in Baffin Bay (600 mbsf, ~8 Ma).
Above this level, the characteristics and modifications of the clay assemblages are controlled climatically and can be explained by the fluctuations of (1) ice-rafting, (2) speed of weak bottom currents, and (3) some supply by mud turbiditic currents. Three clay facies (C3, C4, and C5) can be defined by the abrupt increases of the inherited chlorite and illite clays.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 68.555859 * Median Longitude: -78.725857 * South-bound Latitude: 53.009500 * West-bound Longitude: 164.713500 * North-bound Latitude: 70.458000 * East-bound Longitude: -64.655000
Date/Time Start: 1971-07-30T00:00:00 * Date/Time End: 1985-09-27T20:30:00
Event(s):
19-184B * Latitude: 53.710700 * Longitude: -170.923200 * Date/Time: 1971-07-30T00:00:00 * Elevation: -1910.0 m * Penetration: 973 m * Recovery: 50.2 m * Location: North Pacific/Bering Strait/PLATEAU * Campaign: Leg19 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 122 m cored; 0 m drilled; 41.1 % recovery
19-189 * Latitude: 54.035700 * Longitude: 170.223000 * Date/Time: 1971-08-18T00:00:00 * Elevation: -3437.0 m * Penetration: 871 m * Recovery: 74 m * Location: North Pacific/Bering Strait/RIDGE * Campaign: Leg19 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 165 m cored; 9 m drilled; 44.8 % recovery
19-192A * Latitude: 53.009500 * Longitude: 164.713500 * Date/Time: 1971-08-30T00:00:00 * Elevation: -3014.0 m * Penetration: 1057 m * Recovery: 37.7 m * Location: North Pacific/GUYOT * Campaign: Leg19 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 47 m cored; 0 m drilled; 80.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Thiébault, F; Cremer, M; Debrabant, P et al. (1989): (Table 1) Geochemistry of the clay fraction of ODP Site 105-645. https://doi.org/10.1594/PANGAEA.745171
  2. Thiébault, F; Cremer, M; Debrabant, P et al. (1989): (Table 5) Mg/Al, Fe/Al and Ti/Al ratios from clay fraction of ODP Hole 105-645E. https://doi.org/10.1594/PANGAEA.745175
  3. Thiébault, F; Cremer, M; Debrabant, P et al. (1989): (Table 2) Chemistry of minerals from selected samples of ODP Hole 105-645E. https://doi.org/10.1594/PANGAEA.745172
  4. Thiébault, F; Cremer, M; Debrabant, P et al. (1989): (Table 3) Geochemistry of total rocks from selected samples of ODP Hole 105-645E. https://doi.org/10.1594/PANGAEA.745173
  5. Thiébault, F; Cremer, M; Debrabant, P et al. (1989): (Table 4) Fe/Al and Ti/Al ratios from smectites of ODP Leg 105 and DSDP Leg 19. https://doi.org/10.1594/PANGAEA.745174