利用高精度重磁法对“羊里磁异常”的解释探讨

Explanation and Study on High Precision Gravity and Magnetic Method for " Yangli Magnetic Anomaly "

摘要:

“羊里磁异常”自1967年发现以来，由于所处地质环境为矽卡岩型铁矿成矿有利地段，且紧邻已知的温石埠铁矿，以及“羊里磁异常”规模较大且具备低缓磁异常的特点，一直受到地质界的广泛关注，地勘单位在该区做了大量的铁矿找矿工作，但对“羊里磁异常”勘查中一直未取得突破性进展，该文从高精度重磁角度对“羊里磁异常”进行了定量解释以及定量计算，并通过钻探验证等技术手段，进一步推断“羊里磁异常” 是由古近纪含磁铁碎屑的砂砾岩以及闪长岩共同引起的，对该异常的认识更进了一步。

Abstract:

“Yangli magnetic anomaly” was found in 1967. Because its geological environment is favorable area for skarn type iron deposit, and it is close to Wenshibu iron deposit, its large scale and the characteristics of weak magnetic anomalies, it has attracted wide attention of geologists. Many geological units have carried out a large number of iron ore prospecting work in this area, but there is no breakthrough to “Yangli magnetic anomaly”. From the view of high precision gravity and magnetic anomalies, quantitative interpretation and quantitative calculation have been carried out to “Yangli magnetic anomaly”. Through drilling and other technical means, it is furtherly inferred that “Yangli magnetic anomaly” are caused by Paleogene magnetite clastic sand conglomerate and diorite.