Stable oxygen isotope record of Uvigerina auberiana of sediment core LV76-21@en

Sediments for the δ18O of planktic and benthic foraminifera analysis from core LV76-21 were sampled from 1 cm-thick slices with step of 2–5 cm along the core length. Foraminifera shells were picked from the sediment fractions of 150-250 µm in the samples where they were available. The δ18O of planktic and benthic foraminifera were measured at Tongji University (China) and at the Far Eastern Geological Institute (Russia). Isotope measurements from Tongji University were provided using a Finnigan‐MAT 252 mass spectrometer. The results were validated against a Chinese national carbonate standard (GBW04405) and NBS‐19. The standard deviation is 0.07‰ for δ18O. The isotope measurements from the Far Eastern Geological Institute were analyzed using a Finnigan-MAT 253 mass spectrometer with modification of Velivetskaya et al. (2009) without preliminary roasting. The standard deviation for the δ18O values is ± 0.05‰. All the values are reported on the Pee Dee Belemnite (PDB) scale.针对LV76-21岩芯中浮游有孔虫与底栖有孔虫的δ¹⁸O分析所需沉积物，沿岩芯长度以2–5 cm的间隔切取1 cm厚的切片进行采样。在可获取样品的情况下，从150–250 µm粒径的沉积物组分中挑选有孔虫壳体。浮游与底栖有孔虫的δ¹⁸O测试分别在中国同济大学与俄罗斯远东地质研究所完成。同济大学的同位素测试采用Finnigan‐MAT 252型质谱仪，测试结果以中国国家碳酸盐标准物质（GBW04405）及NBS‐19进行校准验证，其δ¹⁸O的标准偏差为0.07‰。俄罗斯远东地质研究所的同位素测试则采用经Velivetskaya等（2009）改进的Finnigan-MAT 253型质谱仪，且未进行预焙烧处理，该机构测得的δ¹⁸O值标准偏差为±0.05‰。所有测试结果均以佩迪德箭石（Pee Dee Belemnite, PDB）标准进行报告。