(Table 1) Stratigraphic datums from ODP Site 130-806

A 2 m.y. oxygen isotope record of Globigerinoides sacculifer from the Ontong Java Plateau, based on cores from Ocean Drilling Program Leg 130, is dated by matching variations to an orbital template. The procedure allows us to present the most complete Quaternary record available for the western equatorial Pacific. The template-generating algorithm describes a balance between growth and melting of ice. Following basic Milankovitch theory, ice growth is taken as constant, while melting is taken to depend on summer insolation, current ice mass, and average past ice mass. Template settings must be changed once, between 1 and 1.2 Ma, to reflect a major shift in climate. Template fits are strikingly good over much of the record and can be used to detect and fill gaps from core breaks and other disturbances. One result of template dating is an exact age for the Brunhes-Matuyama magnetic reversal boundary, at 790+/-5 ka, as well as several other precise dates (900 ka for the middle Pleistocene climate shift; 1070, 1240, and 1450 ka for isotope stages 31, 37, and 47, respectively). Sedimentation rates fluctuate between 18 and 28 m/m.y., a ca. 400 ka cycle being the most prominent. Major anomalies arise within the transitional regime (1.2 to 1 Ma). The origin of the cycles is unknown; we propose productivity variations in the western equatorial Pacific.

本数据集基于大洋钻探计划（Ocean Drilling Program）第130航次的岩芯，构建了翁通爪哇海台（Ontong Java Plateau）上泡抱球虫（Globigerinoides sacculifer）的2百万年氧同位素记录，通过将其同位素变化与轨道模板匹配的方式完成定年。该定年方法使我们得以获取西赤道太平洋地区目前最为完整的第四纪记录。
轨道模板生成算法刻画了冰体生长与消融之间的平衡关系：依据基础米兰科维奇理论（Milankovitch theory），算法设定冰体生长速率恒定，而消融速率取决于夏季日照量、当前冰体质量以及过往平均冰体质量。为反映一次重大气候转型，轨道模板的参数设置需在1至1.2百万年之间进行一次调整。
该模板与绝大多数记录的拟合效果极佳，可用于识别并填补岩芯中断或其他扰动所造成的记录缺失。通过模板定年得到的结果包括布容-松山地磁反转界线（Brunhes-Matuyama magnetic reversal boundary）的精确年龄：790±5千年，以及其他数个高精度定年结果：中更新世气候转型的年龄为900千年，同位素阶段31、37和47的年龄分别为1070、1240和1450千年。
沉积速率在18至28米每百万年之间波动，其中以约400千年的周期最为显著。在1.2至1百万年的转型期内出现了显著的异常。该周期的成因目前尚不明确，我们推测其与西赤道太平洋的生产力变化相关。