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Robertson, Alastair H F; Bliefnick, D M (2013): Sedimentology and origin of lower Cretaceous pelagic carbonates and redeposited clastics at DSDP Hole 76-534A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.810013, Supplement to: Robertson, AHF; Bliefnick, DM (1983): Sedimentology and origin of lower Cretaceous pelagic carbonates and redeposited clastics, Blake-Bahama formation, Deep Sea Drilling Project Site 534, western Equatorial Atlantic. In: Sheridan, RE; Gradstein, FM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 76, 795-828, https://doi.org/10.2973/dsdp.proc.76.140.1983

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Abstract:
Drilling at Site 534 in the Blake-Bahama Basin recovered 268 m of Lower Cretaceous, Berriasian to Hauterivian, pelagic carbonates, together with volumetrically minor intercalations of claystone, black shales, and terrigenous and calcareous elastics. Radiolarian nannofossil pelagic carbonates accumulated in water depths of about 3300 to 3650 m, below the ACD (aragonite compensation depth) but close to the CCD (calcite compensation depth). Radiolarian abundance points to a relatively fertile ocean. In the Hauterivian and Barremian, during times of warm, humid climate and rising sea level, turbiditic influxes of both terrigenous and calcareous sediments, and minor debris flows were derived from the adjacent Blake Plateau. The claystones and black shales accumulated on the continental rise, then were redeposited onto the abyssal plain by turbidity currents. Dark organic-rich and pale organic-poor couplets are attributed to climatic variations on land, which controlled the input of terrigenous organic matter. Highly persistent, fine, parallel lamination in the pelagic chalks is explained by repeated algal "blooms." During early diagenesis, organic-poor carbonates remained oxygenated and were cemented early, whereas organic-rich intervals, devoid of burrowing organisms, continued to compact later in diagenesis. Interstitial dissolved-oxygen levels fluctuated repeatedly, but bottom waters were never static nor anoxic. The central western Atlantic in the Lower Cretaceous was thus a relatively fertile and wellmixed ocean basin.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 28.343300 * Longitude: -75.381700
Date/Time Start: 1980-10-21T00:00:00 * Date/Time End: 1980-10-21T00:00:00
Event(s):
76-534A * Latitude: 28.343300 * Longitude: -75.381700 * Date/Time: 1980-10-21T00:00:00 * Elevation: -4971.0 m * Penetration: 1666.5 m * Recovery: 612.4 m * Location: North Atlantic/BASIN * Campaign: Leg76 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1113.1 m cored; 31.5 m drilled; 55 % 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. Robertson, AHF; Bliefnick, DM (1983): (Table 3) Carbons and CaCO3 at DSDP Hole 76-534A, shore-based determination. https://doi.org/10.1594/PANGAEA.810010
  2. Robertson, AHF; Bliefnick, DM (1983): (Table 2) Carbon, nitrogen, and CaCO3 at DSDP Hole 76-534A, ship-board measurements. https://doi.org/10.1594/PANGAEA.810009
  3. Robertson, AHF; Bliefnick, DM (1983): (Table 5) δ¹³C and δ¹⁸O at DSDP Hole 76-534A. https://doi.org/10.1594/PANGAEA.810012
  4. Robertson, AHF; Bliefnick, DM (1983): (Table 4) Major element composition at DSDP Hole 76-534A of laminated nannofossil chalks and claystones. https://doi.org/10.1594/PANGAEA.810011
  5. Robertson, AHF; Bliefnick, DM (1983): (Table 1) Minerals at DSDP Hole 76-534A. https://doi.org/10.1594/PANGAEA.810008