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Obrochta, Stephen P; Crowley, Thomas J; Channell, James E T; Hodell, David A; Baker, Paul A; Seki, Arisa; Yokoyama, Yusuke (2014): Petrologic data from Site U1308 over the last three glaciations. PANGAEA, https://doi.org/10.1594/PANGAEA.834640, Supplement to: Obrochta, SP et al. (2014): Climate variability and ice-sheet dynamics during the last three glaciations. Earth and Planetary Science Letters, 406, 198-212, https://doi.org/10.1016/j.epsl.2014.09.004

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Abstract:
A composite North Atlantic record from DSDP Site 609 and IODP Site U1308 spans the past 300,000 years and shows that variability within the penultimate glaciation differed substantially from that of the surrounding two glaciations. Hematite stained grains exhibit similar repetitive down-core variations within the Marine Isotope Stage (MIS) 8 and 4-2 intervals, but little cyclic variability within the MIS 6 section. There is also no petrologic evidence, in terms of detrital carbonate-rich (Heinrich) layers, for surging of the Laurentide Ice Sheet through the Hudson Strait during MIS 6. Rather, very high background concentration of ice-rafted debris (IRD) indicates near continuous glacial meltwater input that likely increased thermohaline disruption sensitivity to relatively weak forcing events, such as expanded sea ice over deepwater formation sites. Altered (sub)tropical precipitation patterns and Antarctic warming during high orbital precession and low 65° N summer insolation appears related to high abundance of Icelandic glass shards and southward sea ice expansion. Differing European and North American ice sheet configurations, perhaps aided by larger variations in eccentricity leading to cooler summers, may have contributed to the relative stability of the Laurentide Ice Sheet in the Hudson Strait region during MIS 6.
Further details:
Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J (2012): A re-examination of evidence for the North Atlantic “1500-year cycle” at Site 609. Quaternary Science Reviews, 55, 23-33, https://doi.org/10.1016/j.quascirev.2012.08.008
Obrochta, Stephen P; Miyahara, Hiroko; Yokoyama, Yusuke; Crowley, Thomas J (2012): Chronology and petrology in MIS4-2 of DSDP Site 94-609. PANGAEA, https://doi.org/10.1594/PANGAEA.834701 (data in MIS4-2 of DSDP Site 94-609)
Coverage:
Median Latitude: 49.877781 * Median Longitude: -24.238112 * South-bound Latitude: 49.877760 * West-bound Longitude: -24.238117 * North-bound Latitude: 49.878333 * East-bound Longitude: -24.238110
Comment:
For data in MIS4-2 of DSDP Site 94-609 see Obrochta et al. (2012).
Size:
9 datasets

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Datasets listed in this publication series

  1. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Age model of IODP Site 303-U1308. https://doi.org/10.1594/PANGAEA.834634
  2. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Coarse grain counts in MIS6 of IODP Site 303-U1308. https://doi.org/10.1594/PANGAEA.834636
  3. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Coarse grain counts in MIS8 of IODP Hole 303-U1308A. https://doi.org/10.1594/PANGAEA.834638
  4. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Elemental composition of detrital carbonates from IODP Site 303-U1308. https://doi.org/10.1594/PANGAEA.834639
  5. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Hematite stained grains and Icelandic glass in MIS6 of IODP Site 303-U1308, fine sand fraction. https://doi.org/10.1594/PANGAEA.834635
  6. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Hematite stained grains, Icelandic glass, and detritic carbonate in MIS8 of IODP Hole 303-U1308A, fine sand fraction. https://doi.org/10.1594/PANGAEA.834637
  7. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Oxygen isotopes of the planktic foraminifer Neogloboquadrina pachyderma (s) in MIS6 of IODP Site 303-1308. https://doi.org/10.1594/PANGAEA.834702
  8. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Oxygen isotopes of the planktic foraminifer Neogloboquadrina pachyderma (s) in MIS8 of IODP Site 303-1308. https://doi.org/10.1594/PANGAEA.834703
  9. Obrochta, SP; Crowley, TJ; Channell, JET et al. (2014): Stratigraphic correlation of IODP Site 303-U1308. https://doi.org/10.1594/PANGAEA.834633