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Badger, Marcus P S; Lear, Caroline H; Pancost, Richard D; Foster, Gavin L; Bailey, Trevor R; Leng, Melanie J; Abels, Hemmo A (2013): Alkenone stable carbon isotopes, carbonate stable carbon and oxygen isotopes, planktic foraminifera boron isotopes and atmospheric CO2 calculations and box model results from Ras il-Pellegrin section, Malta [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.837617, Supplement to: Badger, MPS et al. (2013): CO2 drawdown following the middle Miocene expansion of the Antarctic Ice Sheet. Paleoceanography, 28(1), 42-53, https://doi.org/10.1002/palo.20015

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Abstract:
The development of a permanent, stable ice sheet in East Antarctica happened during the middle Miocene, about 14 million years (Myr) ago. The middle Miocene therefore represents one of the distinct phases of rapid change in the transition from the "greenhouse" of the early Eocene to the "icehouse" of the present day. Carbonate carbon isotope records of the period immediately following the main stage of ice sheet development reveal a major perturbation in the carbon system, represented by the positive d13C excursion known as carbon maximum 6 ("M6"), which has traditionally been interpreted as reflecting increased burial of organic matter and atmospheric pCO2 drawdown. More recently, it has been suggested that the d13C excursion records a negative feedback resulting from the reduction of silicate weathering and an increase in atmospheric pCO2. Here we present high-resolution multi-proxy (alkenone carbon and foraminiferal boron isotope) records of atmospheric carbon dioxide and sea surface temperature across CM6. Similar to previously published records spanning this interval, our records document a world of generally low (~300 ppm) atmospheric pCO2 at a time generally accepted to be much warmer than today. Crucially, they also reveal a pCO2 decrease with associated cooling, which demonstrates that the carbon burial hypothesis for CM6 is feasible and could have acted as a positive feedback on global cooling.
Coverage:
Latitude: 35.915500 * Longitude: 14.334300
Event(s):
Ras_il-Pellegrin * Latitude: 35.915500 * Longitude: 14.334300 * Location: Malta * Method/Device: Outcrop sample (OUTCROP)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Badger, MPS; Lear, CH; Pancost, RD et al. (2013): Alkenone stable carbon isotopes, carbonate stable carbon isotopes, calculated sea surface temperatures and atmospheric pCO2 for the Blue Clay Formation at Ras il-Pellegrin. https://doi.org/10.1594/PANGAEA.837611
  2. Badger, MPS; Lear, CH; Pancost, RD et al. (2013): Boron isotopes, Ba/Ca ratios and pCO2 for the Blue Clay Formation at Ras il-Pellegrin. https://doi.org/10.1594/PANGAEA.837614
  3. Badger, MPS; Lear, CH; Pancost, RD et al. (2013): Stable isotopes of carbonates from the Blue Clay Formation at Ras il-Pellegrin. https://doi.org/10.1594/PANGAEA.837615
  4. Badger, MPS; Lear, CH; Pancost, RD et al. (2013): Carbon cycle modeling for the Blue Clay Formation at Ras il-Pellegrin. https://doi.org/10.1594/PANGAEA.837616
  5. Badger, MPS; Lear, CH; Pancost, RD et al. (2013): Sea surface temperature estimation for the Blue Clay Formation at Ras il-Pellegrin. https://doi.org/10.1594/PANGAEA.823806