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一、前言 M_4低缓异常(图1),是吉林冶金地质公司608队在1981年做地面磁法普查时发现的。该异常位于吉林省南部×××铁矿西南四公里处,处于老岭背斜南东翼隆起部位。异常区内地层主要是震旦系大罗圈河组,不整合覆盖于老岭群大栗子组之上,厚度约300—500米。×××组地层呈一些小天窗零星出露于沟谷之中。测区的西南角和东北角有少量的中生界侏罗系一白垩系地层分布,不整合(构造不整合)于大罗圈河组地层之上。×××铁矿位于该区的东北部。××××铁矿赋存于大栗子组含铁层中,矿体上盘为千
I. INTRODUCTION The M_4 slow anomaly (Figure 1) was discovered by the 608 team of Jilin Metallurgical Geological Company during its ground magnetic survey conducted in 1981. This anomaly is located four kilometers southwest of the ××× iron mine in the southern part of Jilin Province and is located at the uplift of the southern east wing of the Laoling anticline. The strata in the anomaly area are mainly the Sinian Dalaotaihe Formation, and the unconformity covers the large chestnut group of the Laoling Group with a thickness of about 300-500 meters. × × × group stratum was a small skylight scattered in the valleys. There are a few Mesozoic Jurassic-Cretaceous stratigraphic distributions in the southwestern and northeastern corners of the survey area, unconformity (unconformity) occurs above the Daluoquanhe formation. × × × iron ore is located in the northeast of the area. × × × × iron ore hosted in the chestnut group of iron layer, the ore body on the plate for thousands