(Figure DR1) Age model and linear sedimentation rates of ODP SIte 175-1082

The Brunhes/Matuyama (0.75 Ma) and Matuyama/Gauss (2.54 Ma) paleomagnetic boundaries were established using shipboard measurements of natural remanent magnetization (NRM) such as inclination reconstructions (Wefer et al., 1998 doi:10.2973/odp.proc.ir.175.110.1998). An existing age model based on oxygen isotope (delta18O) records from planktonic (Globorotalia inflata) and benthic (Cibicoides wuellerstorfi) foraminifera (Dupont et al., 2005 doi:10.1130/G21401.1) was compared to the alkenone record and the LR04 benthic foraminifera oxygen isotope stack (Lisiecki and Raymo, 2005 doi:10.1029/2004PA001071). Through graphical correlations of peaks obtained from Analyseries 1.2 software (Paillard et al., 1996 doi:10.1029/96EO00259), we improved the previous age model for the past 3.5 Ma at Site 1082. The Pleistocene high resolution alkenone record (1.5-0 Ma) clearly revealed the last fifty glacial/interglacial stages. Patterns of change (3.5-2.8 Ma) in delta18O from benthic foraminifera (Site 1082 and LR04 stack) showed outstanding similarities for the oldest part of the record. For the intermediate period (2.8-1.5 Ma), strong cooling events (Marine Isotopic Stages 58, 78, 82, 96, 100, G6 and G14) were identified in our SST record in agreement with a high resolution alkenone record from the Eastern Equatorial Pacific (Lawrence et al., 2006 doi:10.1126/science.1120395).

本研究通过船载天然剩余磁化强度（natural remanent magnetization, NRM）测量数据（含倾角重建结果），确立了布容/松山（0.75 Ma）与松山/高斯（2.54 Ma）古地磁边界（Wefer等，1998，doi:10.2973/odp.proc.ir.175.110.1998）。本研究将已有的基于浮游有孔虫（Globorotalia inflata）与底栖有孔虫（Cibicoides wuellerstorfi）氧同位素（δ¹⁸O）记录构建的年龄模型（Dupont等，2005，doi:10.1130/G21401.1），与烯酮（alkenone）记录及LR04底栖有孔虫氧同位素堆叠序列（Lisiecki与Raymo，2005，doi:10.1029/2004PA001071）进行对比。借助Analyseries 1.2软件（Paillard等，1996，doi:10.1029/96EO00259）对提取的峰位开展图形关联分析，我们优化了1082站位过去3.5 Ma以来的原有年龄模型。更新后的更新世高分辨率烯酮记录（1.5–0 Ma）清晰揭示了最近50个冰期/间冰期旋回。1082站位与LR04堆叠序列的底栖有孔虫氧同位素变化模式（3.5–2.8 Ma）在记录的最古老段呈现出极高的相似性。在2.8–1.5 Ma的过渡时段，本研究的海表温度（sea surface temperature, SST）记录中识别出多起强降温事件，包括海洋同位素阶段58、78、82、96、100以及G6、G14，该结果与东赤道太平洋的高分辨率烯酮记录一致（Lawrence等，2006，doi:10.1126/science.1120395）。