地球轨道旋回沉积节律研究进展——兼论轨道旋回的沉积学特征、年代学意义和研究方法

ADVANCES IN THE RESEARCH ON ORBITAL FORCING SEDIMENTARY RHYTHM ——A DISCUSSION ON THE IMPLICATIONS TO SEDI MENTOLOGY,CHRONOLOGY AND STUDYING METHODS

地球轨道旋回是古代沉积记录中常见的由地球轨道参数变动控制的沉积节律，它不仅自身表现显著的节律性，而且通过反馈体系强烈影响着沉积作用。同时，轨道旋回节律在不同的沉积背景下以不同的沉积特征显现和规则性叠加。地球轨道旋回赋有的规则频率变化特征又使其具有年代学意义和应用价值，它是天文地质学、地层学及沉积学研究的重点内容。根据国内外资料综述了这些方面的研究进展，并探讨了地球轨道旋回的研究方法。

The orbital forcing cycles,i.e., Milankovitch cycles, are common sedimentary rhythms presented within the ancient deposits,which is key subjects in astrogeology,stratigraphy and sedimentology.Since 19th century,a cyclicity or rhythm of eccentricity,obliquity and precession of Earth orbital paths has been discovered and widely discussed by the researchers all the world.A mechanics of orbital forcing climate cycle,which has a strong effect on depositional sequences through the albedo systems,was focused in a variety of case studies from Quaternary to Precambrian records.The orbital cycles not only display a rhythm itself,but also control depositional stacked patterns, i.e., sedimentary rhythms,from deep sea to tidal settings.Since orbital forcing cycles are characterized by a variation of frequency they have an implication of chronology and give a high resolution durations of stratigraphy,depositional sequences,geological events and biota zones etc. This paper gives a general reviews of the advances in research on orbital cycles,and an approach to the study,including mathematics and geology based on the studies abroad and home.