(Table 6) Sr and Nd isotope duplicates of authigenic Fe-Mn phases of ODP Site 177-1090@en

Sediment depth is given in mcd. Age model after Channell et al. (2003, datasets: doi:10.1594/PANGAEA.717737). Sr ratios were measured in a static mode and using time resolved analysis (TRA) on a Nu MC-ICPMS and 87Sr/86Sr ratios were corrected for mass-bias using an exponential law and 86Sr/88Sr=0.1194. The long-term average value of the TRA-measured 87Sr/86Sr of NBS 987 is 0.710246 (+/-0.000030, 2 sigma). All reported 143Nd/144Nd ratios were corrected for mass fractionation using 146Nd/144Nd=0.7219. International standard JNdi-1 was analyzed between every 5-6 unknown samples and the average of these standard runs were compared to a long term TIMS JNdi-1 value of 0.512103 to determine a correction factor for each of the samples analyzed on that day. Long term external reproducibility of JNdi-1 analyses on the Nu is 0.000014 (0.3 epsilon-Nd units).沉积物深度以复合米（meters composite depth, mcd）为单位给出。年龄模型采用Channell等人（2003年）的方法，相关数据集的DOI为10.1594/PANGAEA.717737。锶同位素比值采用静态模式结合时间分辨分析（time resolved analysis, TRA），在Nu型多接收等离子体质谱（Nu MC-ICPMS）上完成测试；87Sr/86Sr比值通过指数定律进行质量分馏校正，校正参数为86Sr/88Sr=0.1194。经时间分辨分析测试的NBS 987标准物质的87Sr/86Sr比值长期平均值为0.710246（±0.000030，2倍标准偏差，2σ）。所有报道的143Nd/144Nd比值均采用146Nd/144Nd=0.7219进行质量分馏校正。国际标准物质JNdi-1在每5~6个未知样品之间插入测试，将该标准的多轮测试平均值与热电离质谱（thermal ionization mass spectrometry, TIMS）测得的JNdi-1长期基准值0.512103进行比对，以此计算当日所有待测样品的校正因子。采用Nu型质谱开展的JNdi-1测试的长期外部重现性为0.000014（对应0.3 εNd单位）。