Neodymium composition of planktonic foraminifera from IODP Site 363-U1489@en

Foraminifera samples from the deep-sea sediment of an International Ocean Discovery Program (IODP) Site 363-U1489 (2º7.19'N, 141º1.67'E, water depth 3421 m), Western Equatorial Pacific, were measured for the Neodymium isotope composition on the authigenic phases of mixed planktonic foraminifera shells, covering the time-interval from 4 to 2 Ma with an average time-resolution of ~20 ka. The measurements were performed by a ThermoScientific NeptunePlus Multi-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) at LSCE, Gif-sur-Yvette, France, and the results are used to decipher changes in the water-mass circulation of the deep Pacific during the Pliocene-Pleistocene transition.采集自西赤道太平洋国际大洋发现计划（International Ocean Discovery Program, IODP）363-U1489站位（北纬2°7.19′，东经141°1.67′，水深3421 m）深海沉积物中的有孔虫样本，针对混合浮游有孔虫壳体的自生相开展钕同位素组成测试，测试覆盖4~2百万年（Ma）的时间区间，平均时间分辨率约20千年（ka）。本次测试使用赛默飞世尔NeptunePlus型多接收电感耦合等离子体质谱仪（Multi-Collector Inductively Coupled Plasma Mass Spectrometer, MC-ICP-MS），于法国伊维特河畔吉夫的气候与环境科学实验室（Laboratoire des Sciences du Climat et de l'Environnement, LSCE）完成；所得结果用于解析上新世-更新世过渡期西太平洋深层水团环流的演化特征。