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Bralower, Timothy J; Fullagar, Paul D; Paull, Charles K; Dwyer, Gary S; Leckie, R Mark (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from thirteen DSDP and ODP holes. PANGAEA, https://doi.org/10.1594/PANGAEA.717819, Supplement to: Bralower, TJ et al. (1997): Mid-Cretaceous strontium-isotope stratigraphy of deep-sea sections. Geological Society of America Bulletin, 109(11), 1421-1442, https://doi.org/10.1130/0016-7606(1997)109%3C1421:MCSISO%3E2.3.CO;2

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Abstract:
Large variations exist between published mid-Cretaceous (late Barremian to early Turonian stages) seawater Sr-isotope stratigraphies; this has resulted in disparate interpretations of crustal production rates. We report on a detailed investigation of seawater Sr-isotope stratigraphy based on foraminifers and, where available, on inoceramid bivalves from 12 mid-Cretaceous Deep Sea Drilling Project and Ocean Drilling Program sections. The effects of diagenesis are assessed using scanning electron microscope observations and trace-elemental analyses, but are best distinguished by comparing the 87Sr/86Sr values of similar-age samples from different sites. Strontium-isotope analyses compiled from 9 of 12 sites that have detailed age control define one band of common values. This band is used as a composite curve, which presumably represents seawater 87Sr/86Sr values. The composite curve shows a "trough" of markedly lower 87Sr/86Sr values in the Aptian and early Albian stages, higher but constant values for the middle Albian-Cenomanian stages, followed by a decrease in 87Sr/86Sr values in the early Turonian.
Variations between published mid-Cretaceous Sr-isotope records result from diagenetic alteration, analytical problems, and the diverse biostratigraphic approaches and assumptions used to estimate sample ages. When preexisting age data are made consistent, the composite record shows close similarities with data sets derived from measurements of macrofossils in land sections of Europe and North America.
The interval of decreased 87Sr/86Sr values in the Aptian-Albian stages overlaps with the pulse of mid-plate volcanic activity that produced the Ontong Java, Manihiki, and Kerguelen Plateaus. The exact age and the shape of the trough, however, are consistent with increased spreading rates at oceanic ridges, given the existing data on the timing of mid-plate volcanic activity.
Coverage:
Median Latitude: 11.248662 * Median Longitude: -16.247300 * South-bound Latitude: -51.004700 * West-bound Longitude: -76.178000 * North-bound Latitude: 48.910700 * East-bound Longitude: 112.473700
Date/Time Start: 1972-10-25T00:00:00 * Date/Time End: 1988-08-11T21:00:00
Event(s):
26-258 * Latitude: -33.794800 * Longitude: 112.473700 * Date/Time: 1972-10-25T00:00:00 * Elevation: -2793.0 m * Penetration: 525 m * Recovery: 121.5 m * Location: Indian Ocean//PLATEAU * Campaign: Leg26 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 220.5 m cored; 9.5 m drilled; 55.1 % recovery
36-327A * Latitude: -50.871300 * Longitude: -46.783700 * Date/Time: 1974-04-13T00:00:00 * Elevation: -2400.0 m * Penetration: 469.5 m * Recovery: 132.4 m * Location: South Atlantic/PLATEAU * Campaign: Leg36 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 256.5 m cored; 0 m drilled; 51.6 % recovery
44-390 * Latitude: 30.142300 * Longitude: -76.112300 * Date/Time: 1975-08-29T00:00:00 * Elevation: -2665.0 m * Penetration: 206 m * Recovery: 27.1 m * Location: North Atlantic * Campaign: Leg44 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 82.5 m cored; 9.5 m drilled; 32.9 % recovery
Size:
13 datasets

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Datasets listed in this publication series

  1. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 26-258. https://doi.org/10.1594/PANGAEA.717808
  2. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 36-327A. https://doi.org/10.1594/PANGAEA.717809
  3. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 44-390. https://doi.org/10.1594/PANGAEA.717810
  4. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 44-392A. https://doi.org/10.1594/PANGAEA.717811
  5. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 51-417D. https://doi.org/10.1594/PANGAEA.717812
  6. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 52-418B. https://doi.org/10.1594/PANGAEA.717813
  7. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 71-511. https://doi.org/10.1594/PANGAEA.717814
  8. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 79-545. https://doi.org/10.1594/PANGAEA.717815
  9. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 79-547A. https://doi.org/10.1594/PANGAEA.717816
  10. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 79-547B. https://doi.org/10.1594/PANGAEA.717817
  11. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from DSDP Hole 80-551. https://doi.org/10.1594/PANGAEA.717818
  12. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from ODP Hole 103-641C. https://doi.org/10.1594/PANGAEA.717806
  13. Bralower, TJ; Fullagar, PD; Paull, CK et al. (1997): Depth, age, strontium isotopic ratios and trace elemental ratios of samples from ODP Hole 122-763B. https://doi.org/10.1594/PANGAEA.717807