Nannofossil abundance from IODP site 361-U1476 (2.85-1.85 Ma) ...

• Main Author: Tangunan, Deborah N
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2018
• Subjects: Composite Core; Exp361; Joides Resolution; Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.890710; https://doi.pangaea.de/10.1594/PANGAEA.890710

A detailed paleoenvironment reconstruction from the Mozambique Channel, western Indian Ocean, based on the calcareous nannoplankton assemblages was conducted for the interval between 2.85 and 1.85 Myr. This study covers the period during which the successive extinction of the last five species of discoasters occurred. New productivity data obtained from the abundances of the Discoaster species (Discoaster brouweri, D. triradiatus, D. pentaradiatus, D. surculus, and D. tamalis) and other indicative calcareous nannoplankton taxa showed abundance variations, which were at paced with the 100, 41, and 23 kyr astronomical periodicities. A shift in the productivity and water-column stratification proxies occurred at ~2.4 Ma, after the onset of the Northern Hemisphere glaciation. Here we propose that the variability recorded at International Ocean Discovery Program Site U1476 reflects the interplay between forcing associated with warm tropical Pacific and cold southern ocean influences. The former is shown by ... : Supplement to: Tangunan, Deborah N; Baumann, Karl-Heinz; Just, Janna; LeVay, Leah J; Barker, Stephen; Brentegani, Luna; De Vleeschouwer, David; Hall, Ian R; Hemming, Sidney R; Norris, Richard D; IODP Expedition 361 Scientists (2018): The last 1 million years of the extinct genus Discoaster: Plio-Pleistocene environment and productivity at Site U1476 (Mozambique Channel). Palaeogeography, Palaeoclimatology, Palaeoecology, 505, 187-197 ...