根据低缓磁异常找茶陵式铁矿

在湘东地区,赋存于泥盆系锡矿山组中的茶陵式铁矿,呈层状,似层状,受层位控制,具中等至强磁性,能引起规律性明显的低缓磁异常,并呈带状分布。通过对攸县柏市墙背低缓磁异常的推断解释并经钻探验证,在深部找到了铁矿层,扩大了该区铁矿规模,表明磁法是普查这种铁矿的有效手段。湘东地区还有范围更广、更低缓的磁异常,可能是埋深更大的茶陵式铁矿所引起,值得重视。

EXPLORATION FOR CHALING TYPE IRON DEPOSITS ACCORDING TO SMALL AMPLITUDE LOW GRADIENT MAGNETIC ANOMALY

In eastern Hunan, the Chaling type iron deposits, located in Xikuangshan Formation of Devonian, assuming stratiform and bedded shape, with mediumto strong magnetism, can give rise to small amplitude low gradient magnetic anomalies of obvious regularity, showing banded distribution. Through interpretation of the small amplitude low gradient magnetie anomaly in Qiangbei, Boshi, Youxian county, and proved by drilling, iron beds are found in the depth, expanded the dimension of iron ore deposit in this area, which indicates that magnetic prospecting is an effecacious means for exploration of this kind of irondeposits. There are some more extensively-distributed small amplitude low gradient magnetic anomalies in eastern Hunan, which are possible to be eattsed byeeper Chaling type iron deposits, and attention is worthily paid to them.