engleski

A puzzling peace of the Pannonian Puzzle: Tertiary palaeomagnetic results from the W part of the Tisza-Dacia megaunit.

Cretaceous palaeomagnetic declinations from the western as well as the eastern parts of the Tisza-Dacia unit (including the South Carpathians) are remarkably uniform, suggesting that the unit must have been involved in a post-Cretaceous large-angle clokwise rotation. However, Tertiary palaeomagnetic results from the Mecsek (Hungary) and the Slavonian Mts. (Croatia) complicate the picture. In the Mecsek, Miocene ignimbrites, bordering the main Mesozoic-Palaeozoic body in the north-west, exibit about 60o counterclockwise rotation. Similary, counterclockwise rotations were measured in Miocen sedimentary rocks and at an igneous site from the Slavonian Mts. In the main body of the Mecsek, which is the source area of the clockwise rotated Cretaceous directions, the Tertiary rocks, up to 6 Ma in age, exibit large clockwise rotations. The regional distribution of the observations with differential rotation suggests that the northern boundary of the rigid Tisza-Dacia unit cannot coincide with the Mid-Hungarian Mobile Zone; we tentatively suggest that the clockwise rotated area may be a thrust of about 5 Ma in age onto a previously counterclockwise rotated region.

Paleomagnetic declinations; Mecsek; Slavonian Mts; Miocene; clockwise rotation

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