@article{100,
  author = {D. St{\"u}ben and U. Kramar and Z.A. Berner and M. Meudt and G. Keller and S. Abramovich and T. Adatte and U. Hambach and W. Stinnesbeck},
  title = {Late Maastrichtian paleoclimatic and paleoceanographic changes inferred from Sr/Ca ratio and stable isotopes},
  abstract = {<p>Milankovitch-scale cycles can be recognized in high-resolution δ<sup>13</sup>C, δ<sup>18</sup>O, Sr/Ca, mineralogical, and magnetic susceptibility data in hemipelagic sediments that span the last 700 kyr of the Maastrichtian at Elles, Tunisia. Oxygen isotope data reveal three cool periods between 65.50 and 65.55 Ma (21.5-23.5 m), 65.26 and 65.33 Ma (8-11 m), and 65.04 and 65.12 Ma (1.5-4 m), and three warm periods between 65.33 and 65.38 Ma (12-16 m), 65.12 and 65.26 Ma (4-8 m), and 65.00 and 65.04 Ma (0-1.5 m). The cool periods are characterized by small surface-to-deep temperature gradients that reflect intensive mixing of the water column. The surface-to-deep Sr/Ca gradient generally correlates with the oscillating Δ<em>T</em> trend (temperature difference between surface and bottom waters). The carbon isotope composition of planktonic foraminifera indicates a continuous decrease in surface bioproductivity during Late Maastrichtian. Decreasing Δ<sup>13</sup>C values (difference between the δ<sup>13</sup>C values of surface and bottom dwelling foraminifera) and the carbon isotope ratios of the planktonic species at the onset of gradual warming at 65.50 Ma reflect a reduction in surface productivity as a result of decreased upwelling that accompanied global warming and possibly increased atmospheric pCO2 related to Deccan Trap volcanism. Time series analysis applied to magnetic susceptibility, δ<sup>18</sup>O, and Sr/Ca data identifies the 20 kyr precession, 40 kyr obliquity, and 100 kyr eccentricity Milankovich cycles.\&nbsp; <a href="https://geoweb.princeton.edu/research/keller/pubs/St{\"u}ben_et_al_2003_Maastrichtian.pdf" target="_blank">PDF</a></p>
},
  year = {2003},
  journal = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  volume = {199},
  pages = {107 - 127},
  month = {Jan-10-2003},
  issn = {00310182},
  url = {http://linkinghub.elsevier.com/retrieve/pii/S0031018203004991},
  doi = {10.1016/S0031-0182(03)00499-1},
  language = {eng},
}