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针对东北浅覆盖区地质露头少,填图效率不高,精确度和准确度较低的问题,开发了物化探信息协同利用技术并应用于地质体类型的识别。在以覆盖层较薄、面积广大、物理风化为主、土壤位移较小为特点的东北森林沼泽浅覆盖区,利用土壤化学成分和航磁信息识别下覆地质体是可行的。基于这一前提,可将指定研究区划分为一定数量的统计单元,在各单元内,通过数学统计方法将多个航磁数据转化为众数、宽度、变化频率、偏度、峰度等特征参数,将化探指标转化为酸度、碱度、钙含量、铝含量、钙镁含量、铝硅含量、镁铁含量、个别微量元素含量等特征参数;然后采用逐级分类的方法,每级选择有效的物化探特征参数,在当前级别上实现单元划分并将数据分为不同数据集,在下一级别划分时重新有针对地选择参数,分别对各数据集进一步分类,直到分类结果对应较明确的地质填图单元,并最终编制出解译图。以黑龙江省大兴安岭地区某典型森林沼泽浅覆盖区为例进行方法验证,将结果与已知地质信息比对分析,认为地质体单元识别结果与已知信息基本吻合,使得地质体类型识别更精确,边界更清晰,可为区域地质研究提供新线索。
Aiming at the problems of low geologic outcrops, low mapping efficiency and low accuracy and accuracy in the shallow coverage area of Northeast China, the collaborative utilization of geophysical and geochemical information has been developed and applied to the identification of geological body types. It is feasible to identify the underlying overburden by using the chemical composition and aeromagnetic information of the shallow covering area of northeastern forest swamps characterized by thin covering layer, large area, mainly physical weathering and small soil displacement. Based on this premise, the designated study area can be divided into a certain number of statistical units. Within each unit, a number of aeromagnetic data are transformed into characteristics such as mode, width, variation frequency, skewness and kurtosis through mathematical statistics Parameters, the geochemical indicators into the acidity, alkalinity, calcium content, aluminum content, calcium and magnesium content, aluminum and silicon content, magnesium and iron content, individual trace element content and other characteristic parameters; and then use the classification method, each level of choice Effective geophysical and geophysical parameters, divide the data into different data sets at the current level, select the parameters for the next level, and further classify each data set separately until the classification result is more clear Geological mapping unit, and eventually the interpretation of plans. Taking a typical forest swamp shallow cover area in Daxinganling area of Heilongjiang Province as an example, the method is validated and the result is compared with the known geological information. It is concluded that the recognition result of geologic body is basically consistent with the known information, which makes the geologic body type identification more accurate, The clearer boundary can provide new clues for regional geological research.