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对第四纪泥石流活动周期及其与环境演变关系的研究,可以从宏观上预测现代泥石流发育规律及趋势。选取白龙江流域各阶地典型泥石流沉积剖面,用沉积层测年数据确定泥石流活动期发生年代,对比分析与其它古环境记录(新构造运动史、黄土-古土壤系列、深海δ~(18)O曲线)的关系。研究表明:白龙江流域泥石流活动划分为8个周期,即1.5Ma、0.73Ma、0.565~0.425Ma、0.245~0.165Ma、116.8±9.9Ka、50~25Ka、5~4Ka及3Ka以来。泥石流沉积活动周期与新构造运动活跃期有时间上的共轭性,与深海氧同位素δ~(18)O的奇数段及洛川黄土-古土壤系列中古土壤系列有很好的对应关系,泥石流活动是构造运动与气候变化耦合作用的结果。
Studying the relationship between the activity cycle of Quaternary debris flow and its relationship with environmental evolution can predict the development law and trend of modern debris flow from a macro perspective. A typical debris flow sediment profile of each terrace in Bailongjiang River Basin was selected, and the dating of sedimentary layers was used to determine the age of debris flow. The comparative analyzes were made with other paleoenvironmental records (Neotectonic movement history, loess-paleosol series, δ 18 O curve )Relationship. The results show that the debris flow activities in Bailongjiang River Basin are divided into eight cycles, namely 1.5Ma, 0.73Ma, 0.565 ~ 0.425Ma, 0.245 ~ 0.165Ma, 116.8 ± 9.9Ka, 50 ~ 25Ka, 5 ~ 4Ka and 3Ka. The temporal conjugation of the mud-rock flow sedimentary cycle and the active phase of neotectonic movement has a good correspondence with the odd sections of the δ 18 O oil in the deep ocean and the Middle Paleosol series of the Luochuan loess-paleosol series. The debris flow Activities are the result of the coupling of tectonic movements and climate change.