米兰柯维奇韵律层及其年代地层意义

Rhythmites with Milankovitch periods and their chronostratigraphic implications

本文简要介绍了米兰柯维奇轨道三要素（岁差、黄赤交角及偏心率）及其变化周期，并对因轨道要素的变化引起的韵律沉积层的研究现状进行了综述，由于气候变化的全球性以及轨道参数的相对稳定性，本文认为，米兰柯维奇韵律层可以作为盆际，盆内地层对比的重要辅助手段，并可用来测定地层单元的延续时间，实际应用结果表明，其精度要高于现行的生物地层学对比及同位素测龄法。

orbital elements of the Milankovitch cycles that are precession, declination and eccentricity, and their period variation are introduced briefly. The study status about the rhythmic bedding induced by the varintion of the orbital elements is summarized. As the globalism of the climate variation and the relative stability of the orbital elements, the Milankovitch rhythmites can be used for stratigraphic correlation in interbasinal and intrabasinal and for determining the span time of straigraphic unit. The results in practice show the higher resolution than available biostratigraphy and radiometric dating.