Expedition 378 summary

Röhl, Ursula; Thomas, Deborah J; Childress, L.B.; Anagnostou, Eleni; Ausín, Blanca; Dias, Bruna Borba; Galazzo, Flavia Boscolo; Brzelinski, Swaantje; Dunlea, Ann G.; George, Simon C.; Haynes, L.; Hendy, I. L.; Jones, Heather L.; Khanolkar, Sonal; Kitch, Gabriella D.; Lee, H.; Raffi, Isabella; Reis, A.J.; Sheward, Rosie M.; Sibert, Elizabeth C; Tanaka, Erika; Wilkens, Roy H; Yasukawa, Kazutaka; Yuan, Weike; Zhang, Q.; Yang, Zhifeng; Drury, Anna Joy; Hollis, Christopher J.

doi:10.14379/iodp.proc.378.101.2022

Cited by 2 publications

(3 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, paleontological data from the Campbell Plateau at ~52°S (DSDP Site 277 and IODP Site U1553; EOT paleolatitude ~55 °S) belong to the late Eocene to early Oligocene Antarctic biogeographic domain (Kennett et al, 1975;Pascher et al, 2015;Röhl et al, 2020). The calcareous nannofossil low-middle latitude zonation of Agnini et al (2014) was not applicable at Site U1553, while the Southern Ocean zonation of fit a range of other observations during IODP Expedition 378 (Röhl et al, 2022).…”

Section: Global Application Of Biostratigraphic Resultsmentioning

confidence: 58%

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

Viganò¹,

Dallanave²,

Alegret³

et al. 2024

nos

View full text Add to dashboard Cite

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 semiquantitative 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.

show abstract

Section: Global Application Of Biostratigraphic Resultsmentioning

confidence: 58%

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

Viganò¹,

Dallanave²,

Alegret³

et al. 2024

nos

View full text Add to dashboard Cite

show abstract

“…Although this relationship is observed at Walvis Ridge (Röhl et al., 2007; Westerhold et al., 2007; Zachos et al., 2005), Shatsky Rise and Demerara Rise (Westerhold et al., 2017), the correlation of higher Fe intensities with lower δ 13 C values is not observed for the hyperthermal events at Site U1553. This decoupling between Fe and δ 13 C is due to the shallower depositional water depth of Site U1553 (∼1,221 m; Röhl et al., 2022a) compared to other pelagic sites of the early Eocene (2,387–4,755 m). For this reason, it is very likely that sediment deposition occurred above the CCD at Site U1553 and was not affected by the dissolution of calcium carbonate, even during the hyperthermals.…”

Section: Discussionmentioning

confidence: 97%

“…During IODP Expedition 378, Pleistocene to early Paleocene sediments were recovered from five holes at Site U1553, located on the Campbell Plateau off the south coast of New Zealand at 52°13.4′S, 166°11.5′E (Röhl et al., 2022a). This new site was drilled very close to legacy DSDP Site 277, which consists of only one spot‐cored hole with relatively low core recovery (Kennett et al., 1975; Shackleton & Kennett, 1975).…”

Section: Methodsmentioning

confidence: 99%

Apparent Diachroneity of Calcareous Nannofossil Datums During the Early Eocene in the High‐Latitude South Pacific Ocean

Niederbockstruck,

Jones,

Yasukawa

et al. 2024

Paleoceanog and Paleoclimatol

Self Cite

View full text Add to dashboard Cite

The late Paleocene to early Eocene interval is characterized by a series of carbon perturbations that caused transient warming (hyperthermal) events, of which the Paleocene‐Eocene Thermal Maximum (PETM) was the largest. These hyperthermals can be recognized in the pelagic sedimentary record as paired negative δ13C and δ18O excursions, in addition to decreased calcium carbonate and increased iron content caused by carbonate dissolution. However, current data are predominantly sourced from the equatorial‐to subequatorial regions. Here we present a new high‐latitude late Paleocene—early Eocene record, recovered during International Ocean Discovery Program (IODP) Expedition 378 on the Campbell Plateau off New Zealand, in the southwest Pacific Ocean. To construct an age model, we correlated our chemostratigraphic and biostratigraphic data to existing astronomically‐tuned age models from Walvis Ridge (South Atlantic Ocean) and Demerara Rise (equatorial Atlantic Ocean). Our results indicate that the Site U1553 composite section spans ∼7 million years of the latest Paleocene to early Eocene (50.5–57.5 Ma), and preserves many of the early Eocene hyperthermals; including a PETM interval that is more expanded than elsewhere in this region. However, construction of the age model also revealed discrepancies between the chemostratigraphic and biostratigraphic tie points used for correlation. This is likely due to latitudinal diachroneity in the calcareous nannofossil biostratigraphic datums, which are primarily based on low‐to mid‐latitude assemblages. Therefore, our study highlights the need to establish a revised calcareous nannofossil biozonation that is more appropriate for high‐latitude age models.

show abstract

Expedition 378 summary

Abstract: Introduction 2 Background 5 Scientific objectives 6 Site U1553 13 Preliminary scientific assessment 14 References

Cited by 2 publications

References 57 publications

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

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

Apparent Diachroneity of Calcareous Nannofossil Datums During the Early Eocene in the High‐Latitude South Pacific Ocean

Contact Info

Product

Resources

About