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Cronin, Thomas M; Dowsett, Harry J; Dwyer, Gary S; Baker, Paul A; Chandler, Mark A (2005): Mid-Pliocene deep-sea bottom water temperatures based on ostracode Mg/Ca ratios [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.684703, Supplement to: Cronin, TM et al. (2005): Mid-Pliocene deep-sea bottom-water temperatures based on ostracode Mg/Ca ratios. Marine Micropaleontology, 54(3-4), 249-261, https://doi.org/10.1016/j.marmicro.2004.12.003

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Abstract:
We studied magnesium:calcium (Mg/Ca) ratios in shells of the deep-sea ostracode genus Krithe from a short interval in the middle Pliocene between 3.29 and 2.97 Ma using deep-sea drilling sites in the North and South Atlantic in order to estimate bottom water temperatures (BWT) during a period of climatic warmth. Results from DSDP and ODP Sites 552A, 610A, 607, 658A, 659A, 661A and 704 for the period Ma reveal both depth and latitudinal gradients of mean Mg/Ca values. Shallower sites (552A, 610A and 607) have higher mean Mg/Ca ratios (10.3, 9.7, 10.1 mmol/mol) than deeper sites (661A, 6.3 mmol/mol), and high latitude North Atlantic sites (552A, 610 and 607) have higher Mg/Ca ratios than low latitude (658A: 9.8 mmol/mol, 659A: 7.7 mmol/mol, 661A: 6.3 mmol/mol) and Southern Ocean (704: 8.0 mmol/mol) sites. Converting Mg/Ca ratios into estimated temperatures using the calibration of Dwyer et al. (1995) [Dwyer, G.S., Cronin, T.M., Baker, P.A., Raymo, M.E., Buzas, J.S., Corrège, T., 1995. North Atlantic deepwater temperature change during late Pliocene and late Quaternary climatic cycles. Science 270, 1347–1351] suggests that mean middle Pliocene bottom water temperatures at the study sites in the deep Atlantic were about the same as modern temperatures. However, brief pulses of elevated BWT occurred several times between 3.29 and 2.97 Ma in both the North and South Atlantic Ocean suggesting short-term changes in deep ocean circulation.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 15.226522 * Median Longitude: -4.977717 * South-bound Latitude: -46.879500 * West-bound Longitude: -79.378300 * North-bound Latitude: 56.042700 * East-bound Longitude: 161.226700
Date/Time Start: 1979-08-16T00:00:00 * Date/Time End: 1987-05-03T00:00:00
Event(s):
68-502C * Latitude: 11.491300 * Longitude: -79.378300 * Date/Time: 1979-08-16T00:00:00 * Elevation: -3051.0 m * Penetration: 228.7 m * Recovery: 110.8 m * Location: Caribbean Sea/RIDGE * Campaign: Leg68 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 125.3 m cored; 0 m drilled; 88.4 % recovery
81-552A * Latitude: 56.042700 * Longitude: -23.231300 * Date/Time: 1981-07-31T00:00:00 * Elevation: -2301.0 m * Penetration: 183.5 m * Recovery: 182.3 m * Location: North Atlantic/PLATEAU * Campaign: Leg81 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 183.5 m cored; 0 m drilled; 99.4 % recovery
90-588 * Latitude: -26.111700 * Longitude: 161.226700 * Date/Time: 1982-12-06T00:00:00 * Elevation: -1533.0 m * Penetration: 245.6 m * Recovery: 220.8 m * Location: South Pacific/Tasman Sea/CONT RISE * Campaign: Leg90 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 226.4 m cored; 19.2 m drilled; 97.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 68-502C in the North Atlantic. https://doi.org/10.1594/PANGAEA.684694
  2. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 81-552A in the North Atlantic. https://doi.org/10.1594/PANGAEA.684695
  3. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 90-588 in the North Atlantic. https://doi.org/10.1594/PANGAEA.684696
  4. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 94-607 in the North Atlantic. https://doi.org/10.1594/PANGAEA.684697
  5. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 94-610A in the North Atlantic. https://doi.org/10.1594/PANGAEA.684698
  6. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 108-658A in the North Atlantic. https://doi.org/10.1594/PANGAEA.684699
  7. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 108-659A in the North Atlantic. https://doi.org/10.1594/PANGAEA.684700
  8. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Hole 108-661A in the North Atlantic. https://doi.org/10.1594/PANGAEA.684701
  9. Cronin, TM; Dowsett, HJ; Dwyer, GS et al. (2005): (Appendix) Mg/Ca ratios of ostracodes and bottom-water temperature reconstruction for the Mid-Pliocene of ODP Site 114-704 in the North Atlantic. https://doi.org/10.1594/PANGAEA.684702