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一、“低緩磁异常”这个概念在不同地区和同一地区的不同时期,有着不同的內容甲:近来,在普查磁鉄矿床时,大家对低緩磁异常很感兴趣。低緩磁异常的特点怎样? 乙:低緩磁异常是指异常值較低、异常分布面积較大的那些磁异常。至于异常值低到什么程度、异常分布面积大到什么程度才算“低”、“緩”?很难給出一个固定的数目字。記得我們刚参加工作的时候,有的同志用磁法寻找磁鉄矿,得到的磁异常异常值高达几千甚至几万伽(亻马),分布面积很小,一般是小于一平方公里。有的同志用磁法找隐伏的侵入体和研究結晶基岩的起伏,得到的磁异常值一般是几百、有时甚至是几十伽(亻马),最大不过一千伽(亻马)左
First, the concept of “slow magnetic anomalies” has different contents in different regions and in different regions of the same region. Recently, we were very much interested in the slow magnetic anomalies when we surveyed the magnetic 鉄 deposits. Low magnetic anomaly characteristics of what? B: low magnetic anomalies refers to the abnormal value is low, abnormal distribution of those large magnetic anomalies. As for the degree of outliers to what extent, abnormal distribution of large areas to what extent is considered “low”, “slow”? It is difficult to give a fixed number of words. I remember when we first joined the work, some comrades used magnetic methods to search for magnetic ores. The unusual anomalies of magnetic anomalies were as high as several thousands or even tens of thousands of gamma (亻 MA). The distribution area is very small, generally less than one square kilometer. Some comrades use the magnetic method to find hidden invaders and study the fluctuation of crystalline bedrock. The values of magnetic anomalies are generally several hundreds, sometimes even tens of gal, and the maximum is only one thousand gal.