新生代米兰科维奇旋回与天文地质年代表

CENOZOIC MILANKOVITCH CYCLES AND ASTRONOMICAL TIME SCALE

高精度的新生代地质年代表对理解地球圈层的演化规律并最终实现预测其变化趋势有着重要意义。近年米，天文旋回理论逐渐获得了广泛认可并应用于天文地质年代表的建立。通过识别沉积地层中的米兰科维奇旋回并调谐至天文参数曲线，可以获得连续的高分辨率地质年代标尺。目前，新生代地质年代表已完成天文年代的校准，为深入理解新生代地球演化历史提供了可靠的年代学约束；地球轨道力还是新生代一些重要生物、气候、环境与地质事件的可能驱动因素之一。本文将简要介绍旋回地层学的基础理论、新生代天文地质年代表的建立以及受天文轨道控制的重大气候、生物事件的研究现状及重要进展。

The Cenozoic era is the current and most recent of the Earth history. A series of major geological events of the tectonics, life evolutions and climate change happened during the Cenozoic. High-resolution Cenozoic geological time scale plays an important role in understanding the evolution of the Cenozoic Earth systems and predicting its trends. Recently, the theory of astronomical cycles has been applied to establish astronomical time scale. The high- resolution geological time scale can be constructed by identifying the Milankovitch cycles in sedimentary strata, and tuning these cycles to the astronomical solutions. A composite, continuous Cenozoic astronomical time scale can provide reliable geochronology constraints for better understanding the Cenozoic Earth＇s evolution. It is also reported that orbital forcing was one of the main driving mechanisms of some biological, climate, environment and geological events in the Cenozoic. This paper briefly introduces the theoretical basis of cyclostratigraphy, construction of the Cenozoic astronomical time scale, and the research progresses of orbital forced climate and biological events. In China, high-resolution astronomical time scales will contribute greatly to improve our understanding of some critical and global scientific questions, such as the origin and evolution of East Asian monsoon, climate effect of the Tibetan Plateau uplift, and Quaternary glacial and interglacial transition.