Seawater Nd and Pb isotopic record in central Pacific and Caribbean sediments ...

• Main Authors: Osborne, Anne H, Newkirk, Derrick R, Groeneveld, Jeroen, Martin, Ellen E, Tiedemann, Ralf, Frank, Martin
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2014
• Subjects: Ocean Drilling Program ODP; North Atlantic Deep Water; North Atlantic; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.834759; https://doi.pangaea.de/10.1594/PANGAEA.834759

The shoaling and final closure of the Central American Seaway (CAS) resulted in a major change of the global ocean circulation and has been suggested as an essential driver for strengthening of Atlantic Meridional Overturning Circulation (AMOC). The exact timing of CAS closure is key to interpreting its importance. Here we present a reconstruction of deep and intermediate water Nd and Pb isotope compositions obtained from fossil fish teeth and the authigenic coatings of planktonic foraminifera in the eastern equatorial Pacific (Ocean Drilling Program (ODP) Site 1241) and the Caribbean (ODP Sites 998, 999, and 1000) covering the final stages of CAS closure between 5.6 and 2.2 Ma. The data for the Pacific site indicate no significant Atlantic/Caribbean influence over this entire period. The Caribbean sites show a continuous trend to less radiogenic Nd isotope compositions during the Pliocene, consistent with an enhancement of Upper North Atlantic Deep Water (UNADW) inflow and a strengthening of the AMOC. ... : Supplement to: Osborne, Anne H; Newkirk, Derrick R; Groeneveld, Jeroen; Martin, Ellen E; Tiedemann, Ralf; Frank, Martin (2014): The seawater neodymium and lead isotope record of the final stages of Central American Seaway closure. Paleoceanography, 29 ...