Age model for the time between 3.45 and 2.45 Ma of ODP Site 189-1172 ...

• Main Authors: Ballegeer, Anne-Marie, Flores, José-Abel, Sierro, Francisco Javier, Andersen, Nils
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2013
• Subjects: Ocean Drilling Program ODP; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.811548; https://doi.pangaea.de/10.1594/PANGAEA.811548

Calcareous nannoplankton assemblages and benthic d18O isotopes of Pliocene deep-sea sediments of ODP site 1172 (East of Tasmania) have been studied to improve our knowledge of the Southern Ocean paleoceanography. Our study site is located just north of the Subtropical Front (STF), an ideal setting to monitor migrations of the STF during our study period, between 3.45 and 2.45 Ma.The assemblage identified at ODP site 1172 has been interpreted as characteristic for the transitional zone water mass, located south of the STF, based on: (i) the low abundances (< 1%) of subtropical taxa, (ii) relatively high percentages of Coccolithus pelagicus, a subpolar type species, (iii) abundances from 2-10% of Calcidiscus leptoporus, a species that frequently inhabits the zone south of the STF and (iv) the high abundances of small Noelaerhabdaceae which at present dominates the zone south of the STF. Across our interval the calcareous nannoplankton manifests glacial-interglacial variability. We have identified cold ... : Supplement to: Ballegeer, Anne-Marie; Flores, José-Abel; Sierro, Francisco Javier; Andersen, Nils (2012): Monitoring fluctuations of the Subtropical Front in the Tasman Sea between 3.45 and 2.45Ma (ODP site 1172). Palaeogeography, Palaeoclimatology, Palaeoecology, 313-314, 215-224 ...