Nd-Sr isotopic composition of foraminifera and bulk sediments ...

• Main Authors: Vance, Derek, Scrivner, Adam E, Beney, Patricia, Staubwasser, Michael, Henderson, Gideon M, Slowey, Niall C
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2004
• Subjects: Ocean Drilling Program ODP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.839893; https://doi.pangaea.de/10.1594/PANGAEA.839893

We present new isotopic data for sedimentary planktonic foraminifera, as well as for potential water column and sedimentary sources of neodymium (Nd), which confirm that the isotopic composition of the foraminifera is the same as surface seawater and very different from deep water and sedimentary Nd. The faithfulness with which sedimentary foraminifera record the isotopic signature of surface seawater Nd is difficult to explain given their variable and high Nd/Ca ratios, ratios that are often sedimentary foraminifera, ratios that are often much higher than is plausible for direct incorporation within the calcite structure. We present further data that demonstrate a similarly large range in Nd/Ca ratios in plankton tow foraminifera, a range that may be controlled by redox conditions in the water column. Cleaning experiments reveal, in common with earlier work, that large amounts of Nd are released by cleaning with both hydrazine and diethylene triamine penta-acetic acid, but that the Nd released at each step ... : Supplement to: Vance, Derek; Scrivner, Adam E; Beney, Patricia; Staubwasser, Michael; Henderson, Gideon M; Slowey, Niall C (2004): The use of foraminifera as a record of the past neodymium isotope composition of seawater. Paleoceanography, 19(2), PA2009 ...