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
solved whether with the spilitization etc. — as a post-genetic alkalanizing effect — a parent syngenetic alkaline assimilation may be assumed during crystallization of an originally normal Pacific melt which in this way may produce Atlantic resp. Mediterranean rocks, and further to find out from which process this effect may result. Thus it appears further to be necessary that such a genetic principle i. e. the alkaline (agpaitic resp. miascitic) succession as well as the separate apparition of Atlantic resp. Mediterranean formations be justified by geologic, tectonic and rock-genetic experiences. With a view to the fact that in the melt the formation of gravitative or melt-gravitative alkaline accumulation i. e. its relative enrichment is not considered to be possible in the required geologic measure owing to already described thermodinamic and physical difficulties, we deny the existence of alkaline magmas of a permanent origin or of those which result from magma differences, and we shall attempt to prove the paliogene alkalinity of Atlantic and Mediterranean rocks. Among the examinations of transformations being syngenetic with the crystallization process and occuring as a consequence of a reciprocal effect in magmatic melts, FENNER (1908—1910) writes about transformations which have appeared in basalts streamed on the lake-bottom and having been brought about by the activity of vapours having been mobilized by the heat-effect of melts. At the temperature estimated to be approx. 180°, the circulating vapour decomposed the volcanic glass in the rock cooling off and deposited other minerals in its place. A similar phenomenon has been described by T. F. W. BARTH (1945, 1950) in course of his examining the transformations of Permian basalts in the vicinity of Oslo. He reports about the change in the composition of basalts having streamed on swampy damp ground — as compared with the fresh Oslo basalt — in converting it into unite cells: The unite cell of the average basalt: K 21 Na 49 Ca 96 Mg 84 Fe 106 Al 167 Si 473 Ti 20 O 1600 P 2 C 2 .63H 2 0 The unite-cell of transformed basalt as a result of sediment-reciprocity: K 21 Na 24 Ca 69 Mg 149 Fe 95 A 213 Si 412 Ti 40 O 1600 P 6 C 2 .218H 2 0 As a result of the above the transformation is as follows : 2,5 Na-ion 6,5 Mg-ion 2,7 Ca-ion 4,6 Al-ion 1,1 Fe-ion 2,0 Ti-ion 6,1 Si-ion 0,4 P-ion 12,4 cations 13,5 cations ~) extracted 155 molecules ^-introduced. of water J The mineral transformation: Plagioclase + Pyroxene zeolite + chlorite. This transformation which occured as a result of the magma heat-effect, has thus induced chloridization, but there appears to be an alkaline loss (Na). This circle of phenomenon has been described later — indenpendently from these investigations — both in the local and foreign technical literature under the denomination of transvaporisation by E. SZÁDECZKY-KARDOSS.
