基于汇水盆地模型分析方法的东天山戈壁沙漠区矿致地球化学异常提取研究

基于汇水盆地模型分析方法能够直接分析地质地貌因素对次生晕地球化学异常的控制作用，为东天山戈壁沙漠区特殊地球化学景观条件下矿致地球化学异常信息提取难题的解决提供了一种基于“知识驱动”的新思路。本项目拟以东天山戈壁沙漠区1:20万水系沉积物地球化学数据为主要研究对象，研究化探异常空间分布规律的主要受控地质地貌要素与定量表征方式，建立化探异常与受控地质地貌要素之间的统计解释模型，对化探异常的构成进行多参数约束反演，以识别和分离背景与异常。进而，运用定量稀释模型对汇水区内化探异常的顺流稀释作用进行校正，达到增强异常信息的目的，由此识别和提取有较明确地质意义的化探异常区。最后，优化筛选模型和参量，提出有效的基于汇水盆地模型的东天山戈壁沙漠区矿致地球化学异常提取方法，为东天山戈壁沙漠区化探异常的识别与提取提供一种可能的新途径，进一步丰富和完善戈壁沙漠区复杂地球化学景观条件下化探数据处理的理论与方法。

Catchment basin approach could directly analysis the dependence relationship between secondary halo geochemical anomalies and their controlled geological and geomorphological factors. It can provide a novel knowledge-driven based prospective to deal with the problem that geochemical anomaly identification and extraction in Gobi-desert covered landscape area, Eastern Tianshan, China. This project will, firstly, explore the controlled geological and geomorphological factors and their variables expressed approach of geochemical anomaly in Gobi-desert covered landscape area, Eastern Tianshan using 1: 200000 scale stream sediment geochemical data. Then, construct a statistical interpretation model between geochemical anomalies and their controlled geological and geomorphological factors to analysis the possible composition of geochemical anomaly so as to decompose geochemical background and geochemical anomaly. Furthermore, a quantitative downstream dilution model will applied to correct geochemical anomaly dilution effect in stream sediments to enhance geochemical anomaly and the mineralization associated geochemical anomaly district will be identified and extracted. Finally, it would optimize the model and variables to develop a useful catchment basin approach for mapping mineralization associated geochemical anomalies in Gobi-desert landscape area, Eastern Tianshan, China. It will provide a new possible approach to identify and extract significance geochemical anomaly in Gobi-desert landscape area, Eastern Tianshan, and could enrich and improve the theories and methods for mapping geochemical anomaly in Gobi-desert geochemical landscape areas.