Benthic and planktic foraminiferal stable isotope records combined with Nd isotope ratios of ODP Hole 198-1210B


Autoria(s): Jung, Claudia; Voigt, Silke; Friedrich, Oliver; Koch, Mirjam C; Frank, Martin
Cobertura

LATITUDE: 32.223660 * LONGITUDE: 158.259360 * DATE/TIME START: 2001-09-24T14:15:00 * DATE/TIME END: 2001-09-27T00:00:00

Data(s)

24/10/2013

Resumo

The Pacific Ocean is the largest water body on Earth, and circulation in the Pacific contributed significantly to climate evolution in the latest Cretaceous, the culmination of a period of long-term cooling. Here, we present new high-resolution late Campanian to Maastrichtian benthic and planktic foraminiferal stable isotope data and a neodymium (Nd) isotope record obtained from sedimentary ferromanganese oxide coatings of Ocean Drilling Program Hole 1210B from the tropical Pacific Ocean (Shatsky Rise). These new records resolve 13 million years in the latest Cretaceous, providing insights into changes in surface and bottom water temperatures and source regions of deep to intermediate waters covering the carbon isotope excursions of the Campanian-Maastrichtian Boundary Event (CMBE) and the Mid-Maastrichtian event (MME). Our new benthic foraminiferal d18O and Nd isotope records together with published Nd isotope data show markedly parallel trends across the studied interval over a broad range of bathyal to abyssal water depths interpreted to reflect changes in the intensity of deep-ocean circulation in the tropical Pacific. In particular, we observe a three-million-year-long period of cooler conditions in the early Maastrichtian (72.5 to 69.5 Ma) when a concomitant change toward less radiogenic seawater Nd isotope signatures probably marks a period of enhanced admixture and northward flow of deep waters with Southern Ocean provenance. We suggest this change to have been triggered by intensified formation and convection of deep waters in the high southern latitudes, a process that weakened during the MME (69.5 to 68.5 Ma). The early Maastrichtian cold interval is closely related to the negative and positive carbon isotope trends of the CMBE and MME. The millions-of-years long duration of these carbon cycle perturbations suggests a tectonic forcing of climatic cooling, possibly related to changes in ocean basin geometry and bathymetry.

Formato

application/zip, 3 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.821024

doi:10.1594/PANGAEA.821024

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Jung, Claudia; Voigt, Silke; Friedrich, Oliver; Koch, Mirjam C; Frank, Martin (2013): Campanian-Maastrichtian ocean circulation in the tropical Pacific. Paleoceanography, 28(3), 562-573, doi:10.1002/palo.20051

Palavras-Chave #143Nd/144Nd; 143Nd/144Nd e; 87Sr/86Sr; 87Sr/86Sr e; Age; AGE; Depth; DEPTH, sediment/rock; e-Nd(0); e-Nd(T); epsilon-Neodymium (0); epsilon-Neodymium (T); Label; Mass spectrometer Finnigan MAT 253; mbsf; N. truempyi d13C; N. truempyi d18O; Neodymium 143/Neodymium 144; Neodymium 143/Neodymium 144, error; Nuttallides truempyi, d13C; Nuttallides truempyi, d18O; Ocean Drilling Program; ODP; ODP sample designation; R. rugosa d13C; R. rugosa d18O; Rugoglobigerina rugosa, d13C; Rugoglobigerina rugosa, d18O; Sample code/label; size fraction 150-212 µm; size fraction 150-500 µm; Strontium 87/Strontium 86, error; Strontium 87/Strontium 86 ratio
Tipo

Dataset