Genesis of ultrabasic-basic rocks ('Ophiolites') of north Hungary

Kubovics, Imre

http://hdl.handle.net/10400.3/4893

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Authors

Kubovics, Imre

Abstract(s)

Most of the researchers consider the ultrabasic-basic magmatites of North Hungary (Bükk Mountains) to be an ophiolitic complex. Nevertheless, on basis of the comparative analyses of the igneous formations with the typical (South-European, from Asia Minor, etc.) ophiolites, considerable petrological-petrogenetic difference can be established. The most characteristic difference shown in the change of FeO+/MgO as a function .of silica. Dissimilarly of the typical ophiolites, the FeO+/MgO ratio decreases parallel and unambiguously with the increase of silica. Its highest value found within the given sequence in certain ultrabasites (3 to 4). The oxidation degree is also considerably lower than in the ophiolites cited. […].