Calcareous nannofossil biostratigraphy and biochronology across the Eocene-Oligocene transition: the record at IODP Site U1509 (Tasman Sea) and a global overview

Viganò, Allyson ; Dallanave, Edoardo ; Alegret, Laia (Universidad de Zaragoza) ; Westerhold, Thomas ; Sutherland, Rupert ; Dickens, Gerald R. ; Newsam, Cherry ; Agnini, Claudia

Resumen: The abundance, wide distribution, and high evolutionary rates of calcareous nannofossils provide a powerful and reliable tool for correlating and dating marine sedimentary records, especially during the Cenozoic. Their assemblage turnover has been documented extensively across the Eocene-Oligocene transition (EOT), but without a parallel framework toward detailed biostratigraphy. We present highly resolved semi-quantitative calcareous nannofossil data from a continuous Eocene-Oligocene transition record recovered during International Ocean Discovery Program (IODP) Site U1509 (Expedition 371), presently located at 34.4° S latitude in the New Caledonia Trough (Tasman Sea). We present an improved age model for sedimentation at this site based on integrated bio-magnetostratigraphy. Our high resolution biostratigraphic data provide an independent age calibration for biohorizons, both established and additional, which we compare to previous biochronological estimates from low-middle and high latitudes. This allows for a critical evaluation of the accuracy, reliability, synchroneity or diachroneity of each biohorizon across different oceanographic domains. Finally, we infer that Site U1509 belonged to the subtropical low-middle latitude domain during the late Eocene to early Oligocene, with a paleolatitude of ~45°S. This result has important implications for paleoceanographic reconstructions.

Idioma: Inglés

DOI: 10.1127/nos/2023/0751

Año: 2024

Publicado en: Newsletters on Stratigraphy 57, 1 (2024), 1-23
ISSN: 0078-0421

Factor impacto JCR: 2.6 (2024)

Categ. JCR: GEOLOGY rank: 7 / 61 = 0.115 (2024) - Q1 - T1

Factor impacto SCIMAGO: 0.932 - Stratigraphy (Q1) - Geology (Q1)

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Paleontología (Dpto. Ciencias de la Tierra)