Authigenic element concentration and neodymium isotope from IODP Sites 303-U1302, 303-U1305, and ODP Site 105--647

Labrador Sea sediment cores IODP 303-U1302, 303-U1305, and ODP 105-647 were investigated for their authigenic trace metal concentrations and neodymium isotope signatures. The sediments are 0 - 35 thousand years old and the authigenic fractions were extracted with weak acid-reductive bulk sediment leaching, with leaching of the decarbonated sediment, and from picked foraminifera samples, and analysed using ICP-QMS and MC-ICP-MS in 2016 - 2019. They were interpreted in terms of exchange with sediment and sea water, and regional climate-induced changes in continental weathering and ocean circulation. Data of three sediment sites were extracted with three different methods. Columns are site and core name, sample depth in cm top and bottom and meters composite depth, sample mass in grams, epsilon Nd signature, two standard deviations uncertainty to epsilon Nd signature, concentrations of 32 elements in µg per gram bulk sediment used, calculated carbonate concentration relative to bulk sediment mass in %, the ratio of heavy to light rare earth elements, mid rare earth element enrichment, cerium anomaly, europium anomaly, sediment age minimum, maximum, and weighted mean in thousand years inferred from sediment datings analysed with the BACON package for the R software, and the sediment classification in terms of IRD events.