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一、前言物探方法在铬铁矿床上的应用,在国外主要是利用重力法和磁法勘探,曾获得良好的结果。在我国内蒙地区用航空磁测圈定了数千平方公里的超基性岩体,但在超基性岩中用扭秤直接找铬矿未取得预期的地质效果。为扩大物探方法在铬铁矿上的应用,根据铬铁矿与围岩在电性上有一定的差异,进行了以纵向梯度法为主的电剖面法的试验。该法过去多用于寻找伟晶岩脉和石英岩脉,用于找铬矿仅是尝试。在试验中对其它电剖面法如联合剖面等也做了少量试验。由于工作效率低,只可能在一定条件下,做为解释的补助资料。这里仅就纵向梯度法的主要实验成果,分述
I. Foreword The application of geophysical methods to chromite deposits has been mainly achieved by gravimetric and magnetic methods in foreign countries and has achieved good results. In China’s Inner Mongolia, magnetostricosis was used to define thousands of square kilometers of ultramafic rocks. However, it is not possible to obtain the expected geological results by directly looking for chrome ore in the ultramafic rocks using a torsion balance. In order to expand the application of geophysical prospecting methods to chromite, according to the difference of electrical properties between chromite and surrounding rock, the longitudinal gradient method is used to test the electrical profile method. In the past, this method was mostly used for finding pegmatites and quartz dikes. It was only for the purpose of finding chrome ore. In the experiment of other electrical cross-section method such as joint profile also made a small amount of tests. Due to the low efficiency of work, it is only possible under certain conditions to provide subsidies for explanation. Here only the longitudinal gradient method of the main experimental results, described