以成矿年代学为基础的磁法勘查新技术的初步试验研究

THE PRELIMINARY TEST AND STUDY OF A NEW MAGNETIC EXPLORATION TECHNIQUE ON THE BASIS OF METALLOGENIC CHRONOLOGY

成矿年代学认为 ,某地区特定类型的矿床形成于特定的地质时期。根据古地磁学与地磁年代学 ,特定地质时期的地磁场方向一定。通过比较矿化岩石与围岩的剩余磁化方向 ,可确定矿化异常。本文讨论了磁法勘查新技术的成矿年代学基础 ,提出以“地质时间”为核心概念的表达矿异常的参数 ,并通过一个实例简要说明该新技术在找矿勘探上的潜力。

Based on the theory of paleomagnetism and geomagnetochronology that the Earth magnetic field has definite direction in a specific geological period, we can recognize anomalies related to mineralization through a comparision of residual magnetization directions between mineralized rocks and wall rocks. This paper has discussed the metallogenic chronological basis of a new magnetic exploration technique, put forward the parameters for expressing anomalies related to mineralization with 'geological time' as the key concept, and with a practical example, briefly illustrated the potentiality of the new technique in ore-prospecting and exploration.