Integrated record of the Late Lutetian Thermal Maximum at IODP site U1508, Tasman Sea: The deep-sea response

Peñalver-Clavel, Irene (Universidad de Zaragoza) ; Agnini, Claudia ; Westerhold, Thomas ; Cramwinckel, Marlow J. ; Dallanave, Edoardo ; Bhattacharya, Joyeeta ; Sutherland, Rupert ; Alegret, Laia (Universidad de Zaragoza)

Resumen: The Late Lutetian Thermal Maximum (LLTM) was a transient and brief global warming event recorded in the middle Eocene, at 41.52 Ma. The biotic response to the LLTM has been documented at only a few marine sites so far. Here, we present the first record of deep-sea benthic foraminiferal assemblage changes during the LLTM in the southwest Pacific at International Ocean Discovery Program Hole U1508C (1609 m water depth) in the Tasman Sea. The LLTM coincides with a negative excursion in bulk sediment δ13C (0.47‰) and benthic foraminifera δ13C (0.36‰), with changes in the relative abundance of benthic foraminiferal species and in the deep-water organic geochemistry. The decrease in diversity of the assemblages indicates environmental stress during the event, potentially linked to oxygen deficiency, as evidenced by the occurrence of dysoxic taxa (e.g. Lenticulina spp., Turrillina brevispira). Although calcareous taxa dominate, the presence of corrosion-resistant species and poorly preserved foraminiferal tests suggest slightly CaCO3-corrosive bottom waters, but no dissolution was evident. We suggest the shallowing of the thermocline and enhanced water column stratification at this site during the LLTM.

Idioma: Inglés

DOI: 10.1016/j.marmicro.2024.102390

Año: 2024

Publicado en: MARINE MICROPALEONTOLOGY 191 (2024), 102390 [19 pp.]
ISSN: 0377-8398

Factor impacto JCR: 1.6 (2024)

Categ. JCR: PALEONTOLOGY rank: 23 / 56 = 0.411 (2024) - Q2 - T2

Factor impacto SCIMAGO: 0.575 - Paleontology (Q2) - Oceanography (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2019-105537RB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN PRE2020-092638

Tipo y forma: Article (Published version)

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

Dataset asociado: Supplementary Information: The Late Lutetian Thermal Maximum: first record of the deep-sea benthic foraminiferal response in the Tasman Sea (IODP Site U1508) ( https://doi.org/10.5281/zenodo.13170668)