Paleo and rock magnetic datasets of discrete samples from site ODP 1233 covering 40-65 ka

Discrete samples were taken to cover the time interval from 40 to 70 ka, corresponding to depths between 68 and 130 meters composite depth (mcd), as provided by the IODP Gulf Coast Repository (GCR) at Texas A&M University. Since the working halves of the ODP 1233 cores are nearly depleted, discrete paleomagnetic cube samples were unevenly collected from Holes 1233B, 1233C, and 1233D. Paleomagnetic results include Natural Remanent Magnetization (NRM) and Anhysteretic Remanent Magnetization (ARM), and remanences after various alternating fields (AF) demagnetistion steps (5, 10, 15, 20, 30, 40, 50, 65, 80, and 100 mT). Characteristic Remanent Magnetization (ChRM) directions were determined through Principal Component Analysis (PCA). NRM and ARM were measured using a 2G Enterprises 755 SRM long-core magnetometer at the GFZ Potsdam, Germany. Rock magnetic data inclues Low-frequency magnetic volume susceptibility 𝜅LF was measured using an AGICO Multi-function Kappabridge MFK1-A, applying a field of 200 Am−1 and a frequency of 976 Hz at the GFZ Potsdam, Germany. A 2G Enterprises 660 pulse magnetizer was used to impart an Isothermal Remanent Magnetization (IRM), with the saturation IRM (SIRM) acquired at 1500 mT. IRM measurements were performed using a Molyneux spinner magnetometer at China University of Geosciences (Wuhan), China. The S-ratio was calculated as: S-ratio = 0.5 × (1 − [IRM−0.2T/SIRM1.5T]), where values range from 0 to 1. Based on rock magnetic resutls, relative paleointensity was normalized using ln(NRM40mT)/ARM and then scale to a relative range. The age model is based on correlating the RPI of discrete samples from site ODP 1233 to the the SAPIS curve, which integrates five RPI records from the South Atlantic (Stoner et al., 2002), and by aligin the ARM to the Antarctic temperature reconstruction from the EPICA Dome C (EDC) ice core (Jouzel et al., 2007).