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pp.29-40
A magnetic survey was carried out at the Barton Peninsula in King George Island, Antarctica. To analyze geological features in the study area, several filtering methods in 2-dimensional wavenumber domain were used. The Barton Horst associated with volcanic activities is well revealed on the low-pass filtered anomaly map. Possible existence of small volcanic plugs or, presumably, mineralized zones are apparent at northern parts and south-western part by reduction-to-the-pole and pseudo-gravity filtering. On the 1st vertical derivative and directional filtered anomaly maps, the geological boundaries on the surface are well identified, and fault strikes along E-W or NW-SE direction appeared to be mostly dominant throughout the study area. Density and susceptibility mapping were performed using the inversion method. The apparent densities of tuffaceous rocks distributed in the southern parts and those of quartz-diorite or crystal tuff in the northern parts were computed as values up to about 2.69 g/㎤ and 2.73 g/㎤, respectively, and the apparent susceptibilities of those rocks are appeared to be about 250 × 10^(-6) CGS and 1870 × 10^(-6) CGS, respectively. These results are in accordant with those of samples measured by Garrett(1990). Therefore, it is concluded that the studied area of the Barton peninsula has been influenced by crustal movement associated with active volcanism and the surface lithology is extended to the considerable depth.
