Cretaceous, Tertiary and Quaternary Palaeomagnetic Results from Hungary

Forty Tertiary and Quaternary lavas and shallow intrusive bodies have been sampled from four areas of Hungary. At least four oriented cores were taken from each body. The direction of magnetization has been determined for specimens cut from each core using the alternating-field cleaning technique to peak fields of at least 20 millitesla (200 gauss) and when necessary as high as 50 mT (500 gauss). Many of the cores showed a very high stability. Very tight clustering of the directions for the different cores from the same body give a mean value of α95 of 3.3°. Normal, reversed and anomalous directions are found and significant deviations of the mean virtual pole positions from the present pole are discussed. Eleven Cretaceous lavas or shallow intrusive bodies were also sampled in one area in the manner described above except that all the cores had to be magnetically oriented. The results from these Cretaceous samples are generally rather scattered. This scatter may be the result of strong tectonic movements in the Cretaceous area after the bodies were formed, or of the commonly rather decomposed nature of the material from the limited exposure available.