Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Detailed geophysical measurement in the Karlovy Vary granite pluton along the profile Doubí-Karlovy Vary
Abstract
The Western Krušné hory/Erzgebirge pluton is part of a large, partly hidden granite batholith within the Saxothuringian Zone of the Central European Variscides. The pluton is the source of a prominent regional gravity low. The exact cause of this anomaly is still poorly understood. The aim of this study was to decide whether various granite types differ in physical properties and should be distinguished in regional geophysical modelling. We collected a set of samples and measured densities and magnetic susceptibilities in the laboratory. In the field we studied a 3.5 km long geophysical profile using gravity and magnetic methods. The profile intersects three types of granites: OIC (older suite, in figures and table SIK), YIC (younger suite, in figures and table MIK)) and a narrow body of microgranites (granite porphyries). The measurements generally confirm density homogeneity of various granites with an exception of slightly higher bulk densities of microgranites compared with OIC granites. In magnetic field we observe that the values of quiet magnetic field over YIC are higher than those measured over OIC (sharp boundary in profile measurements). The magnetic field over microgranites is probably masked by an artificial source.
