论文部分内容阅读
使用石英ESR法示踪河流沉积物源是一种新方法和新理论的探索。本文从拟解决的科学问题出发,在着重分析石英ESR信号强度和CI值物源示踪理论基础之上,讨论了该方法在亚洲现代沙尘沉降物源示踪和地质历史时期风尘堆积物源示踪研究中的有效性,结合ESR测年可覆盖整个第四纪时期的特性,认为石英ESR法不仅可以为物源示踪提供良好的年代框架约束,而且还可以较好的反映地质历史时期沉积物质来源在不同时空尺度上的变化特征。随后,通过对指导思想、研究思路以及长江流域不同河段和主要支流的地质地貌背景、岩石类型分布、水系组合特征以及“源-汇”系统之间物质剥蚀-堆积过程的可通达性等方面的综合论述与分析,讨论了石英ESR法在河流沉积物源示踪上的有效性及其在研究长江流域水系发育历史和沉积演化过程中的可行性。
The use of quartz ESR method to trace the source of river sediments is a new method and new theory. Based on the analysis of the ESR signal intensity of quartz and the source tracing theory of CI value, this paper discusses the application of this method in the tracing of the source sediment source in Asia and the source of dust accumulation in geological history The effectiveness of tracer studies combined with ESR dating covers the characteristics of the entire Quaternary period. It is believed that the quartz ESR method not only provides a good framework for the dating of provenances, but also reflects well the geological history Variation Characteristics of Sedimentary Material Sources on Different Spatial and Temporal Dimensions. Subsequently, through the guidance of ideology, research ideas and the geological and geomorphological background of different river sections and major tributaries in the Yangtze River Basin, the distribution of rock types, the characteristics of the water system and the accessibility of the material erosion-accumulation process between the “source-sink” system And other aspects of the comprehensive discussion and analysis of the quartz ESR method to discuss the validity of the river sediment source tracing and its feasibility in the study of the Yangtze River basin water system development and sedimentary evolution process.