Sm-Nd isotope and Mn/Ca ratios for cleaned Neogloboquadrina pachyderma from ODP Hole 105-647A (Table 1) ...

• Main Authors: Vance, Derek, Burton, Kevin W
• Format: Dataset
• Language: English
• Published: PANGAEA 1999
• Subjects: DEPTH, sediment/rock; AGE; Sample code/label; Mass; Manganese/Calcium ratio; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; ε-Neodymium; ε-Neodymium, standard deviation; Samarium; Neodymium; Neodymium/Calcium ratio; Samarium-147/Neodymium-144 ratio; Samarium-147/Neodymium-144, standard deviation; Drilling/drill rig; DSDP/ODP/IODP sample designation; Inductively coupled plasma - mass spectrometry ICP-MS; Mass spectrometer Finnigan MAT 262; Calculated; Leg105; Joides Resolution; Ocean Drilling Program ODP; Neogloboquadrina pachyderma
• Online Access: https://dx.doi.org/10.1594/pangaea.711374; https://doi.pangaea.de/10.1594/PANGAEA.711374

The neodymium (Nd) isotope composition of ancient seawater is a potentially useful tracer of changes in continental inputs and ocean circulation on timescales of a few ka. Here we present the first Nd isotope record for seawater using sedimentary foraminifera cleaned using standard oxidative-reductive techniques. The data, along with Mn/Ca ratios, suggest that cleaned foraminifera provide a reliable record of Nd in seawater and hold out the prospect of using Nd in foraminifera to examine changes in seawater that accompany glacial-interglacial climatic cycles. The principal potential problem to be overcome with the use of forams as records of trace elements in ancient seawater is their diagenetic Fe-Mn coatings. These contain large amounts of Nd and other trace elements but can be cleaned off using highly reducing reagents. Mn(Ca ratios for the majority of the cleaned sedimentary foraminifera analysed here lie within the range (10-100 µmol/mol) that has yielded success in studies of transition elements in ... : N. pachyderma left and right coiling, >63 µm ...