Magnetic characteristics of tectonic provinces of Korea

Abstract

Magnetic anomaly map have abundant information, which is an important tool for understanding the geological evolution and mineral exploration. The pattern and shape of magnetic anomaly is a powerful indicator of geologic structure, rock formation, and mineral resources. KIGAM has conducted airborne magnetic mapping programme since 1981, and has coverage of almost whole the country. Recently, we published the latest version of airborne magnetic anomaly map by compiling data acquired from 1982 to 2012. The surveys were flown in patchwork fashion. Therefore some adjustments were required for compiling and merging data. The data were continued to the reference altitude of 300 m above ground level. The residual magnetic anomaly map was acquired by reducing regional field of 11th generation IGRF. The newly compiled magnetic anomaly map was examined with respect to the geologic structures. Magnetic anomaly patterns primarily reflect the distribution and structural setting of magnetized material within the crust. These features of individual anomalies or the texture of anomalous regions can provide useful constraints for geological interpretation. Korea (southern part of the Korean peninsula) could be divided in 5 tectonic provinces. The pattern and shape of magnetic anomalies in each tectonic province was briefly examined from the perspective of geologic structural characteristics.