第四纪测年研究新进展

第四纪与人类的关系及其在地质历史中的重要位置,需要高精度高分辨率的测年。第四纪地质学家们改进、发展了许多第四纪的测年方法。文章主要从岩石地层法、生物法、磁性地层法、考古法、放射性定年法等方面讨论了近年第四纪测年的一些研究进展。目前,这些方法的主要进展表现在由于科学技术的提高,如激光显微探测技术等,使得测年的精度、功效显著提高而样品的用量却有了显著的降低,并且拓展了一些测年的应用领域,如电子自旋法应用于冰碛物的测年,其据测年结果建立的序列可与深海氧同位素阶段对比。但要使得测年的可靠性增强,则需要有丰富的地质工作经验,根据所测样品的特征选择恰当的测年方法,且要尽量选择多种适当方法进行对比测年。 

NEW PROGRESS IN QUATERNARY DATING RESEARCH

The Quaternary plays an important role in the geological history because it is closely related to the human beings.Therefore highly reliable and precise Quaternary dating is needed.Now geologists have improved and developed many Quaternary dating methods.This paper discusses some recent advances in the Quaternary dating in respect to rock stratigraphy,biology,magnetic stratigraphy,archaeology and isotope dating.The main progress of these methods is as follows: the dating precision and efficiency have bean raised markedly while the required dosage of a dated sample is reduced significantly because of the development of technologies,such as the Ar-Ar laser microprobe dating;and these dating methods can be used in wider research fields. For example,the ESR method has used in dating of tills and the sequences established according to the dating results may correlate with the deep sea oxygen isotope stages. However,it is necessary to have plenty of geological experience,choose appropriate dating methods according to the features of the samples and use as many appropriate methods as possible for comparative dating to improve the reliability of dating.