Age determination and stable oxygen isotope record of ODP Hole 167-1017E

Oxygen isotopic (d18O) climatic stratigraphy and radiocarbon chronology, at high resolution, have been used to establish an age model for Ocean Drilling Program Hole 1017E, a continuous 25-m sequence of hemipelagic sediments from the continental slope (956 m water depth), east of Point Arguella, Southern California. The upper part of Hole 1017E from ~33 ka (7.445 mbsf) was dated using 13 calendar-corrected radiocarbon ages of mixed planktonic foraminiferal assemblages. Benthic oxygen isotopic stratigraphy records a continuous 130-k.y. sequence ranging from marine isotope Stage 6 to the present day. The benthic d18O curve, representing the last two interglacial and glacial cycles, closely resembles the well-dated, deep-sea reference sequence, providing a detailed chronologic framework. Sedimentation rates remained relatively constant throughout the sequence at ~18 cm/k.y. and were sufficiently rapid to provide considerable potential for high-resolution paleoceanographic/paleoclimatic investigations. […]研究采用高分辨率氧同位素（d18O）气候地层学与放射性碳年代学方法，为加利福尼亚南部阿盖拉角以东的大洋钻探计划（Ocean Drilling Program）1017E井位建立了年代模型。该井位位于水深956米的大陆坡上，发育一套连续25米的半远洋沉积序列。其约33 ka（对应海底以下7.445米，mbsf）的上部层位，通过13个经过日历校正的混合浮游有孔虫组合放射性碳年龄完成定年。底栖氧同位素地层记录了一套连续13万年的沉积序列，时间跨度覆盖海洋同位素第6阶段直至现今。代表末次两个间冰期与冰期旋回的底栖d18O曲线，与定年精准的深海参考序列高度相似，为相关研究提供了详细的年代学框架。整个序列的沉积速率相对稳定，约为18厘米/千年，且沉积速率足够快，为开展高分辨率古海洋学与古气候学研究提供了巨大潜力。……