Stable isotopes and Mg/Ca ratios of Globorotalia truncatulinoides from sediment core M78/1_235-1

• Main Authors: Nürnberg, Dirk, Riff, Tabitha, Bahr, André, Karas, Cyrus, Meier, Karl J F, Lippold, Jörg
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: 235-1; AGE; DEPTH; sediment/rock; Globorotalia truncatulinoides; Aluminium/Calcium ratio; Iron/Calcium ratio; Magnesium/Calcium ratio; Manganese/Calcium ratio; δ13C; δ18O; M78/1; M78/1_235-1; Mass spectrometer Finnigan MAT 253 coupled to a KIEL IV carbonate preparation device; Meteor (1986); N. Tobago; PC; Piston corer; Reference of data; Sedimentation rate; Subsurface temperature; seawater; reconstructed; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.919497; https://doi.org/10.1594/PANGAEA.919497

Stable carbon (δ13C) and oxygen isotope (δ18O) and Mg/Ca-measurements were performed on the planktonic subsurface-dwelling foraminiferal species Globorotalia truncatulinoides. The foraminiferal specimens were selected from piston core M78/1-235-1, which was recovered from Tobago Basin (11°36.53'N 60°57.86'W) from 852 m water depth during R/V Meteor Cruise 78/1. Sampling and analytical studies were carried out from 630 to 800 cm core depth at 1-2 cm spatial resolution. This dataset extends the existing subsurface proxy records (Reißig et al., 2019; doi:10.1594/PANGAEA.897083) further back in time, now focusing on the time period of the latest fully developed D/O events (~30-37 ka BP). The isotope analyses were performed in 2019 on a Thermo Scientific MAT 253 mass spectrometer with an automated Kiel IV Carbonate Preparation Device. Trace metal analyses were performed on a VARIAN 720-ES Axial ICP-OES, a simultaneous, axial-viewing Inductively Coupled Plasma - Optical Emission Spectrometer coupled to a VARIAN SPS3 sample preparation system. The proxy data provide information on the Tobago Basin subsurface hydrography in relation to Western Boundary Current and North Atlantic Subtropical Gyre interdynamics.