Hernández-Almeida, Iván; Sierro, Francisco Javier; Filippelli, Gabriel M; Voelker, Antje H L; Diz, Paula: Elemental geochemistry (P, Ca, Al, Fe and Mn) from IODP 306-U1314 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.980516 (dataset in review)

Elemental geochemistry (P, Ca, Al, Fe and Mn) from IODP Site 306-U1314, between 84.12-60 mcd, which corresponds to ca. 779-1069 ka. The age model was previously published in Hernández-Almeida et al. (2012, doi:10.1029/2011PA002209) and it is made by aligning the benthic foraminifera δ18O record (mainly Cibicidoides wuellerstorfi and Melonis pompilioides) to the LR04 benthic stack (Lisiecki and Raymo, 2005; doi:10.1029/2004PA001071). Samples used in this study were recovered during International Ocean Drilling Program Expedition 306. Site U1314 was cored in the Gardar Drift on the eastern flank of the Reykjanes Ridge, in the subpolar North Atlantic. Approximately 240 samples at approximately 8 cm resolution were analyzed using total sediment digestions of bulk sediment for major/minor elements. Around 0.1 g of powdered sample was dissolved by adding 10 ml of purified Mili-Q water and concentrated trace-metal grade HNO3, HF and HCl, following EPA SW846 Method 305. Total digestion was performed in a CEM MDS-2000 microwave. Once the digestion was complete, boric acid was added to stabilize the solutions. The samples were transferred to new polypropylene tubes and diluted with 50 ml of Milli-Q water. Total elemental concentrations were determined using a P950 Inductively Coupled Plasma - Atomic Emission Spectrometer (ICP-AES) with a CETAC AT5000+ Ultrasonic Nebulizer at the Department of Earth and Environmental Sciences at Indiana University. Elements analyzed for total concentrations include P, Ca, Al, Fe, Mn. National Institute of Standards & Technology (NIST) Standard Reference Material (SRM) 1646a, estuarine sediment, was used to evaluate analytical reliability. The certified value for P is 0.027±0.001. We normalize the concentration of Mn and P in bulk sediments relative to Al, based on the assumption that the composition of the Al-bearing phases of the lithogenics remained constant in space and time. Mn/Al ratios (0.004–0.117) are generally in excess during interglacial intervals of what can be expected from the average crustal abundance (i.e. 0.0075 for Upper Continental Crust (UCC); 0.0116 for Average Andesitic Crust (AAC)) (Taylor and McLennan, 1985; doi:10.1017/S0016756800032167). During glacial intervals (e.g., 888–866 ka) or short-lived cold intervals (at 1060, 1000 and 980 ka), the Mn/Al ratios are close to the average detrital composition (Mn/Al < 0.011). External precision was evaluated using 20 randomly chosen samples, with 1 SD replicate precision of ±120 µg/g for Mn/Al, 0.0098 µg/g for P/Al.