APPLICATION AND EXPLORATION OF GEOPHYSICAL METHODS IN GEOLOGICAL MAPPING IN STRONGLY WEATHERED AREA
CHEN Song;CHEN Chang-jing;WU Jun;LIU Lian;BU Jian-jun;Wuhan Center of Geological Survey,CGS;Geological Exploration Technologies institute of Anhui Province;
Due to the unique geological feature of Southern China area,such as thick overburden layerfew outcrops,thick-growing vegetation and difficult access, it is difficult to effectively identify the geological characteristics of weathered layers and its underlying strata,rocks,structures and minerals by means of traditional geological mapping methods. Through comprehensive geophysical methods including shallow earthquake,high density resistivity and EH4 electromagnetic imaging,the geological characteristics like weathering layer thickness,bedrock lithology and occurrence,and buried fault are tested. By analyzing the data obtained from this 3 methods and the results of field investigation,the validity and applicability of this 3 geophysical methods are studied,and a series of geophysical methods for geological mapping in strongly weathered area are preliminarily summarized.