摘要
由于沉积环境与成因的不同 ,第四纪地层的岩性、成分、结构和厚度在短尺度空间范围内可能发生明显的变化 .地表松散沉积物在自然营力的作用下容易受到剥蚀、搬运和再沉积 ;在气候变化、生物活动、特别是水的作用下 ,其化学成分和结构也会发生变化 .因此 ,第四纪地层不仅在空间上复杂多变 ,而且其组成、岩性等也随时间变化 .本文讨论了第四纪松散沉积物的测年问题 ,对各种测年方法适用的测定对象与测年范围作了分析和对比 。
Quaternary stratum may have obvious changes of short-term temporal scale in lithostratigraphy, composition and thickness because of different sedimentary conditions and forming causes. The non-cohesive sediments on the earth's surface are ready to undergo erosion, transposition and re-sedimentation under the operation of the natural forces. Changes in the Quaternary sediments in chemical compositions and structures also come because of the affection of the climate variation, biotic activities, and especially the existence of water. The Quaternary sediments, therefore, changes in spatial aspect and their compositions and lithostratigraphic features also have variation with changing time. This paper discussed the dating problems for Quaternary non-cohesive sediments, various dating methods and their usability for dating materials and also the dating ranges are analyzed and compared with the aim to obtain the ages data which is as close as possible to the real time when the strata and the geo-events occur.
出处
《安徽师范大学学报（自然科学版）》
CAS
2001年第4期383-388,共6页
Journal of Anhui Normal University(Natural Science)
基金
国家自然科学基金 ( 4 0 0 710 83)
高校博士点基金 ( 2 0 0 0 0 2 8414 )
南京大学"985"自然地理重点学科建设项目资助成果
关键词
第四纪
测年方法
沉积物
适用性
地质学
quaternary
dating methods
usability of the dating methods
