Authigenic neodymium isotope (εNd) analyses were carried out on uncleaned mixed planktonic foraminifera. Around 60 mg of planktonic foraminifera shells were handpicked from the >150 μm fraction, crushed and ultrasonicated to remove clays without removal of the authigenic oxides. The cleaned samples were then dissolved in 1 M acetic acid and centrifuged before transferred to Teflon vials. The supernatants were dried-down before re-dissolution in 0.3 M nitric acid. Rare earth elements (REE) were separated from other elements using Eichrom TRUspec™ resin and neodymium was extracted from the other REE using Eichrom Lnspec™ resin using a method published by Larkin et al. (2021). All samples were analysed on a Thermo Neptune Plus multi-collector inductively-coupled plasma mass spectrometer (MC-ICP-MS) at the University of Cambridge (Department of Earth Sciences). Measurements were corrected for mass fractionation to a 146Nd/144Nd ratio of 0.7219. Samples were bracketed with concentration-matched solutions of standard Jndi-1 (Tanaka et al., 2000) with a value of 0.512115±0.000007.