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Woodruff, Fay; Savin, Samuel M (1991): Age models and stable isotope ratios from the Mid-Miocene. PANGAEA, https://doi.org/10.1594/PANGAEA.704918, Supplement to: Woodruff, F; Savin, SM (1991): Mid-Miocene isotope stratigraphy in the deep sea: high-resolution correlations, paleoclimatic cycles and sediment preservation. Paleoceanography, 6(6), 755-806, https://doi.org/10.1029/91PA02561

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Abstract:
Mid-Miocene pelagic sedimentary sections can be correlated using intermediate and high resolution oxygen and carbon isotopic records of benthic foraminifera. Precision of a few tens of thousands of years is readily achievable at sites with high sedimentation rates, for example, Deep Sea Drilling Project sites 289 and 574. The mid-Miocene carbon isotope records are characterized by an interval of high d13C values between 17 and 13.5 Ma (the Monterey Excursion of Vincent and Berger 1985) upon which are superimposed a series of periodic or quasi-periodic fluctuations in d13C values. These fluctuations have a period of approximately 440 kyr, suggestive of the 413 kyr cycle predicted by Milankovitch theory. Vincent and Berger proposed that the Monterey Excursion was the result of increased organic carbon burial in continental margins sediments. The increased d13C values (called 13C maxima) superimposed on the generally high mid-Miocene signal coincide with increases in d18O values suggesting that periods of cooling and/or ice buildup were associated with exceptionally rapid burial of organic carbon and lowered atmospheric CO2 levels. It is likely that during the Monterey Excursion the ocean/atmosphere system became progressively more sensitive to small changes in insolation, ultimately leading to major cooling of deep water and expansion of continental ice. We have assigned an absolute chronology, based on biostratigraphic and magneto-biostratigraphic datum levels, to the isotope stratigraphy and have used that chronology to correlate unconformities, seismic reflectors, carbonate minima, and dissolution intervals. Intervals of sediment containing 13C maxima are usually better preserved than the overlying and underlying sediments, indicating that the d13C values of TCO2 in deep water and the corrosiveness of seawater are inversely correlated. This again suggests that the 13C maxima were associated with rapid burial of organic carbon and reduced levels of atmospheric CO2. The absolute chronology we have assigned to the isotopic record indicates that the major mid-Miocene deepwater cooling/ice volume expansion took 2 m.y. and was not abrupt as had been reported previously. The cooling appears abrupt at many sites because the interval is characterized by a number of dissolution intervals. The cooling was not monotonic, and the 2 m.y. interval included an episode of especially rapid cooling as well as a brief return to warmer conditions before the final phase of the cooling period. The increase in d18O values of benthic foraminifera between 14.9 and 12.9 Ma was greatest at deeper water sites and at sites closest to Antarctica. The data suggest that the d18O value of seawater increased by no more than about 1.1 per mil during this interval and that the remainder of the change in benthic d18O values resulted from cooling in Antarctic regions of deepwater formation. Equatorial planktonic foraminifera from sites 237 and 289 exhibit a series of 0.4 per mil steplike increases in d13C values. Only one of these increases in planktonic d13C is correlated with any of the features in the mid-Miocene benthic carbon isotope record.
Coverage:
Median Latitude: -9.783528 * Median Longitude: 36.773644 * South-bound Latitude: -61.579000 * West-bound Longitude: -133.330200 * North-bound Latitude: 33.642200 * East-bound Longitude: 161.226700
Date/Time Start: 1972-06-06T00:00:00 * Date/Time End: 1988-03-08T17:15:00
Event(s):
108-667A * Latitude: 4.569200 * Longitude: -21.911300 * Date/Time Start: 1986-04-08T13:45:00 * Date/Time End: 1986-04-12T10:00:00 * Elevation: -3529.3 m * Penetration: 381.3 m * Recovery: 309.16 m * Location: North Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 41 core; 381.3 m cored; 0 m drilled; 81.1 % recovery
115-709A * Latitude: -3.915000 * Longitude: 60.551700 * Date/Time Start: 1987-06-05T01:30:00 * Date/Time End: 1987-06-06T06:30:00 * Elevation: -3047.0 m * Penetration: 203.1 m * Recovery: 184.74 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 21 core; 203.1 m cored; 0 m drilled; 91 % recovery
119-744A * Latitude: -61.579000 * Longitude: 80.595000 * Date/Time Start: 1988-02-05T19:00:00 * Date/Time End: 1988-02-06T19:15:00 * Elevation: -2318.0 m * Penetration: 176.1 m * Recovery: 144.91 m * Location: Indian Ocean * Campaign: Leg119 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 176.1 m cored; 0 m drilled; 82.3 % recovery
Size:
18 datasets

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Datasets listed in this publication series

  1. Woodruff, F; Savin, SM (1991): Age model of DSDP Hole 24-237. https://doi.org/10.1594/PANGAEA.422523
  2. Woodruff, F; Savin, SM (1991): Age model of DSDP Hole 30-289. https://doi.org/10.1594/PANGAEA.422524
  3. Woodruff, F; Savin, SM (1991): Age model of DSDP Hole 82-563. https://doi.org/10.1594/PANGAEA.422525
  4. Woodruff, F; Savin, SM (1991): Age model of DSDP Hole 85-574. https://doi.org/10.1594/PANGAEA.422526
  5. Woodruff, F; Savin, SM (1991): Age model of DSDP Hole 90-588. https://doi.org/10.1594/PANGAEA.422527
  6. Woodruff, F; Savin, SM (1991): Age model of DSDP Hole74-525. https://doi.org/10.1594/PANGAEA.52461
  7. Woodruff, F; Savin, SM (1991): Age model of ODP Hole 115-709A. https://doi.org/10.1594/PANGAEA.422520
  8. Woodruff, F; Savin, SM (1991): Age model of ODP Hole 119-744A. https://doi.org/10.1594/PANGAEA.422521
  9. Woodruff, F; Savin, SM (1991): Age model of ODP Hole 120-747A. https://doi.org/10.1594/PANGAEA.422522
  10. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 24-237. https://doi.org/10.1594/PANGAEA.55427
  11. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 30-289. https://doi.org/10.1594/PANGAEA.55438
  12. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 30-289. https://doi.org/10.1594/PANGAEA.55426
  13. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 74-525A. https://doi.org/10.1594/PANGAEA.358391
  14. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 74-525B. https://doi.org/10.1594/PANGAEA.358392
  15. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 82-563. https://doi.org/10.1594/PANGAEA.358393
  16. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDP Hole 85-574. https://doi.org/10.1594/PANGAEA.52459
  17. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of DSDPHole 24-237. https://doi.org/10.1594/PANGAEA.55430
  18. Woodruff, F; Savin, SM (1991): Stable isotope ratios measured on foraminifera of ODP Hole 108-667A. https://doi.org/10.1594/PANGAEA.358390