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Alcalá-Herrera, Javier A; Grossman, Ethan L; Gartner, Stefan (1992): Stable carbon and oxygen isotope ratios across the Cretaceous/Tertiary boundray on the Walvish Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.683531, Supplement to: Alcalá-Herrera, JA et al. (1992): Nannofossil diversity and equitability and fine-fraction d13C across the Cretaceous/Tertiary boundary at Walvis Ridge Leg 74, South Atlantic. Marine Micropaleontology, 20(1), 77-88, https://doi.org/10.1016/0377-8398(92)90010-H

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Abstract:
The isotopic composition and diversity of nannofossils were studied in cores from the Deep Sea Drilling Project (DSDP) Sites 525A, 527, 528, and 529 from the Walvis Ridge, South Atlantic to better understand the changes which occurred across the Cretaceous/Tertiary boundary (K/T boundary). The stratigraphic range of the samples is from the Arkhangelskiella cymbiformis Zone in the Maastrichtian to the Heliolithus kleinpelli Zone in the Danian. Nannofossil diversity was high (Shannon-Weaver diversity index, 'H= 2.5-3) in the late Cretaceous, but decreased sharply (H c. 1 ) across the K/T boundary. The delta13C values also decrease across the K/T boundary at the four sites, suggesting a reduction in surface productivity in the South Atlantic concomitant with the reduction in diversity. During the Danian, nannofossil diversity and delta13C show some recovery approximately 500-700 k.y. after the boundary event. However, not until 2.5 Ma after the boundary event did diversity become constant. Diversity values similar to those for the late Cretaceous were not attained again in the early Paleocene interval studied. Carbon isotopic compositions similar to those from the Cretaceous were not attained until 4.5 Ma after the K/T event.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -28.641875 * Median Longitude: 2.460150 * South-bound Latitude: -29.070700 * West-bound Longitude: 1.763300 * North-bound Latitude: -28.041500 * East-bound Longitude: 2.985300
Date/Time Start: 1980-06-10T00:00:00 * Date/Time End: 1980-07-18T00:00:00
Event(s):
74-525A * Latitude: -29.070700 * Longitude: 2.985300 * Date/Time: 1980-06-10T00:00:00 * Elevation: -2467.0 m * Penetration: 678.1 m * Recovery: 406.6 m * Location: South Atlantic/CREST * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 549.7 m cored; 6 m drilled; 74 % recovery
74-527 * Latitude: -28.041500 * Longitude: 1.763300 * Date/Time: 1980-06-28T00:00:00 * Elevation: -4428.0 m * Penetration: 384.5 m * Recovery: 243.4 m * Location: South Atlantic * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 380 m cored; 4.5 m drilled; 64.1 % recovery
74-528 * Latitude: -28.524800 * Longitude: 2.324000 * Date/Time: 1980-07-04T00:00:00 * Elevation: -3800.0 m * Penetration: 555 m * Recovery: 271.9 m * Location: South Atlantic/RIDGE * Campaign: Leg74 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 47 cores; 441 m cored; 0 m drilled; 61.7 % 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. Alcalá-Herrera, JA; Grossman, EL; Gartner, S (1992): (Appendix) Stable carbon and oxygen isotope ratios of fine-fraction sediments across the Cretaceous/Tertiary boundary of DSDP Hole 74-525A from Walvis Ridge, South Atlantic. https://doi.org/10.1594/PANGAEA.683527
  2. Alcalá-Herrera, JA; Grossman, EL; Gartner, S (1992): (Appendix) Stable carbon and oxygen isotope ratios of fine-fraction sediments across the Cretaceous/Tertiary boundary of DSDP Hole 74-527 from Walvis Ridge, South Atlantic. https://doi.org/10.1594/PANGAEA.683528
  3. Alcalá-Herrera, JA; Grossman, EL; Gartner, S (1992): (Appendix) Stable carbon and oxygen isotope ratios of fine-fraction sediments across the Cretaceous/Tertiary boundary of DSDP Hole 74-528 from Walvis Ridge, South Atlantic. https://doi.org/10.1594/PANGAEA.683529
  4. Alcalá-Herrera, JA; Grossman, EL; Gartner, S (1992): (Appendix) Stable carbon and oxygen isotope ratios of fine-fraction sediments across the Cretaceous/Tertiary boundary of DSDP Hole 74-529 from Walvis Ridge, South Atlantic. https://doi.org/10.1594/PANGAEA.683530