西北半干旱地区岩屑地球化学异常提取方法的研究

西北地区主要发育残山丘陵地貌。风成砂、急雨过后的黄土硬壳以及下伏膏岩层的普遍发育在一定程度上影响了地球化学勘查数据的代表性，也给异常的提取和解释带来了困难。针对这种特殊的自然景观和地质背景，以西北半干旱地区——阿拉善某地为例，介绍了工作区地质特征，用传统的统计学方法、趋势面法、滑动平均法提取相关元素地球化学异常，在此基础上结合地质矿产资料进行综合对比，探讨了较为适合半干旱地区地球化学勘查数据处理的方法。

Study on extraction method of rock geochemical anomaly in semi arid region in Northwest China

Residual hills landforms were developed in Northwest China. The widespread development of loess crust and its underlying rock layers formed by aeolian sand and rain affected the representative of geochemical investigation data, brought difficulties for the extraction and explanation of the anomaly. In lights of the above unique natural landscape and geological settings, the authors presented the geological properties of a place in Alashan of Northwest China as a study case, extracted the related geochemical anomalies with conventional methods of statistical method, trend surface analysis and moving average method. And a comprehensive contrast was conducted in combination with the available information on geology and mineral resources, proper method of geochemical anomaly extraction in semi arid region of Northwest China was discussed in the text.