Dating analysis from DSDP Hole 90-594

Date-32 is a fast and easily used computer program developed to date Quaternary deep-sea cores by associating variations in the earth's orbit with recurring oscillations in core properties, such as carbonate content or isotope composition. Starting with known top and bottom dates, distortions in the periodicities of the core properties due to varying sedimentation rates are realigned by fast Fourier analysis so as to maximise the spectral energy density at the orbital frequencies. This allows age interpolation to all parts of the core to an accuracy of 10 kyrs, or about 1.5% of the record duration for a typical Brunhes sequence. The influence of astronomical forcing is examined and the method is applied to provide preliminary dates in a high-resolution Brunhes record from DSDP Site 594 off southeastern New Zealand.

Date-32是一款便捷易用的计算机程序，专为第四纪深海岩芯定年开发，其原理为将地球轨道变化与岩芯属性（如碳酸盐含量、同位素组成）的周期性波动相关联。该程序以已知的岩芯顶、底部定年结果作为初始输入，通过快速傅里叶分析（Fast Fourier Analysis）校正因沉积速率差异引发的岩芯属性周期畸变，使轨道频率下的频谱能量密度达到最大值。这一方法可实现岩芯全段的年龄插值，精度可达10千年（kyrs）；对于典型的布容（Brunhes）序列而言，该精度约为记录时长的1.5%。本研究考察了天文强迫的影响，并将该方法应用于新西兰东南部海域深海钻探计划（Deep Sea Drilling Program，DSDP）594站位的高分辨率布容序列岩芯，得到了初步定年结果。