Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 56. (Budapest 1964)
Csalogovits, J. I.: The non-magnetic derivation of Atlantic and Mediterranean rock-provinces and their connection with orogenic metamorphism
Thus if examined (t) in the function of time, which at the same time represents also a growing orogenic compression, the variation of the A-index meets the condition of e *„D(t,p) I e-M)(t,p) A n = chX n D(t,p) = — in which at the P 0 pressure belonging to t 0 time A = 1, i. e. at a P 0 pressure value being higher than that, the migrating potassium causes a potassian metasomathosis, and at a lesser P K pressure they cause sodium metasomathosis. From this it follows that Atlantic rocks characterized by a lesser metamorphic pressure must be situated farther from the axis of the orogenic system in the Fig. 3: Permeation of provincial types on the Alpine orogene territory. P= Pacific, A= Atlantic, M= Mediterranean, AM = Atlantic-Mediterranean (according to P. NIGGLI.) belt of a lesser pressure, whereas the Mediterranean types are in the central dehydrated zone being metamorphized rather highly. Similarly to that the géosynclinal carbonic sediment of a low pelite contents is favourable for the formation of Mediterranean type magmatites. This is being proved by the regional-map of the province type rocks (Fig. 3). The pre-orogenic rocks i. e. those which have already consolidated during compression, may assume a secondary Atlantic character (spilites) as a result of the syntectonic alkalizing effect of the orogenesis. The variation of the composition of Alpine, Dinaric ophiolites and those of southern Hungary which have been subject of a closer examination by us (Atlantic rocks having been described earlier as Trachydolerites) is shown on figures enclosed herewith. Part of the ophiolites may be grouped in the field of trachydolerites, tephrites and basanites although with paligene alcalinity they are not syngenetic with the cooling process, but they are spilite-type zeolite albitic (Fig. 4—5).
