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Barrera, Enriqueta C; Savin, Samuel M; Thomas, Ellen; Jones, Charles E (1997): Strontium isotope data from DSDP Sites 32-305 and 62-463 and ODP Sites 113-689 and 113-690 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712680, Supplement to: Barrera, EC et al. (1997): Evidence for thermohaline-circulation reversals controlled by sea-level change in the latest Cretaceous. Geology, 25(8), 715-718, https://doi.org/10.1130/0091-7613(1997)025%3C0715:EFTCRC%3E2.3.CO;2

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Abstract:
Fluctuations in oxygen (d18O) and carbon (d13C) isotope values of benthic foraminiferal calcite from the tropical Pacific and Southern Oceans indicate rapid reversals in the dominant mode and direction of the thermohaline circulation during a 1 m.y. interval (71-70 Ma) in the Maastrichtian. At the onset of this change, benthic foraminiferal d18O values increased and were highest in low-latitude Pacific Ocean waters, whereas benthic and planktic foraminiferal d13C values decreased and benthic values were lowest in the Southern Ocean. Subsequently, benthic foraminiferal d18O values in the Indo-Pacific decreased, and benthic and planktic d13C values increased globally. These isotopic patterns suggest that cool intermediate-depth waters, derived from high-latitude regions, penetrated temporarily to the tropics. The low benthic d13C values at the Southern Ocean sites, however, suggest that these cool waters may have been derived from high northern rather than high southern latitudes. Correlation with eustatic sea-level curves suggests that sea-level change was the most likely mechanism to change the circulation and/or source(s) of intermediate-depth waters. We thus propose that oceanic circulation during the latest Cretaceous was vigorous and that competing sources of intermediate- and deep-water formation, linked to changes in climate and sea level, may have alternated in importance.
Further details:
GSA data repository - Evidence for thermohaline-circulation reversals controlled by sea-level change in the latest Cretaceous
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -19.081317 * Median Longitude: 84.205704 * South-bound Latitude: -65.160667 * West-bound Longitude: 1.204867 * North-bound Latitude: 32.002200 * East-bound Longitude: 174.667800
Date/Time Start: 1973-08-29T00:00:00 * Date/Time End: 1987-01-23T00:00:00
Event(s):
32-305 * Latitude: 32.002200 * Longitude: 157.850000 * Date/Time: 1973-08-29T00:00:00 * Elevation: -2903.0 m * Penetration: 640.5 m * Recovery: 212.2 m * Location: North Pacific/CONT RISE * Campaign: Leg32 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 67 cores; 622 m cored; 9 m drilled; 34.1 % recovery
62-463 * Latitude: 21.350200 * Longitude: 174.667800 * Date/Time: 1978-08-02T00:00:00 * Elevation: -2525.0 m * Penetration: 822.5 m * Recovery: 305.5 m * Location: North Pacific/SEAMOUNT * Campaign: Leg62 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 92 cores; 820.5 m cored; 0 m drilled; 37.2 % recovery
113-689 * Latitude: -64.517000 * Longitude: 3.100150 * Date/Time Start: 1987-01-15T00:00:00 * Date/Time End: 1987-01-19T00:00:00 * Elevation: -2091.0 m * Penetration: 470.5 m * Recovery: 375.3 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 49 cores; 450.1 m cored; 0 m drilled; 83.4% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Barrera, EC; Savin, SM; Thomas, E et al. (1997): Strontium isotope data from DSDP Site 32-305. https://doi.org/10.1594/PANGAEA.712678
  2. Barrera, EC; Savin, SM; Thomas, E et al. (1997): Strontium isotope data from DSDP Site 62-463. https://doi.org/10.1594/PANGAEA.712679
  3. Barrera, EC; Savin, SM; Thomas, E et al. (1997): Strontium isotope data from DSDP Site 113-689. https://doi.org/10.1594/PANGAEA.712676
  4. Barrera, EC; Savin, SM; Thomas, E et al. (1997): Strontium isotope data from DSDP Site 113-690. https://doi.org/10.1594/PANGAEA.712677