碎屑锆石U-Pb年代学在地学应用中的现状

锆石U-Pb年代学作为地学研究中一种有效的定年方法,通过半个世纪的发展,已经形成了完善的理论体系和实验方法。随着其测试效率和精度不断提高,成本逐渐降低,其研究也朝更广的邻域延伸,近年来碎屑锆石U-Pb年代学在地学中得到了广泛的应用。本文重点介绍碎屑锆石U-Pb年代学在最大沉积年龄分析、物源分析、构造演化分析三方面的应用和扩展,以及碎屑锆石研究中需要注意的再循环锆石、锆石Pb丢失、锆石的滞后时间、锆石生产力差异以及分析结果存在误差导致的年龄偏差的问题。

The Present State of Detrital Zircon U-Pb Geochronology and its Geological Application

Detrital zircon U-Pb geochronology as an effective dating method in geological research has formed a sound theoretical system and experimental method through the development of half-century. With the continuous improvement of testing efficiency and accuracy, the cost is gradually reduced, and its research extends to a wider field. In recent years, detrital zircon U-Pb chronology has been widely used in geosciences. This paper focuses on the application and expansion of detrital zircon U-Pb geochronology, include tracing the change of provenance, revealing the uplift of the mountains, predicting sedimentary deposits, reflecting the changes of rivers, estimating provenance contribution rate of deposition, recovering the evolution of early Earth, studying the evolution of the underlying terrane, displacement of terrane, reconstruction of tectonic belt, and so on. Meanwhile, research of detrital zircon should focus on some issues that lead to major error, recycled zircon, Pb loss, lag time, zircon fertility, and measurement error. These issues need to be combined with other analytical methods to discuss.