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
This water content moreover shows a correlation with the Na-contents of the rocks which also proves that in so far the high water-content does not originate from the primary Pacific basaltic melt of a low diluted water-content, in that case it got into the melt system together with the sodium-contents in the course of the crystallisation. The calculations of Na 2 0-H 2 0 resp. K 2 0-H 2 0 correlations were made on basis of original analysisdata of essexite-theralite rock types published by TRÜGER. separately for abyssal, hypabyssal, resp. sub-vulcanic types. According to the calculations thus made, the correlation index in the abyssic essexite theralite types is on, Na-H 2 0-r A = 0,0012, with the hypabyssic Fig. 1.: Correlative and regressive index alteration characterizing the stochastic functionconnexion of Na 2 0 — H 2 0 contents of essexite rocks in the function of the pressure value, expressed with the D depth 1. Correlative coefficients of analcime natronamphibolitic essexites (lugarites) — 2. Correlative coefficients of the average essexites —3. Regressive coefficients of analcime-natronamphibolic essexites — 4. Regressive coefficients of the average of essexites types r HA = 0,15, while with the sub-vulcanic types r s = 0,343 showing a growing trend towards the superficially forming zones (Fig 1.). This depth, more exactly the decreasing trend according to the growing pressure (D) shows a certain similarity with C H8 o - C 0H2O e-Wp) connection, describing the water loss of pelites in the function of the pressure, resp. pressure value expressed by the depth. Taking into consideration that the dehydration shows a linear correlation with the Na loss, we arrive to that statement of GOLDSCHMIDT'S according to which the sodium together with the aqueous phase clears out of the sediment in course of the metamorphosis of pelites, as against the potassium remaining bonded into the pelites (Fig 2.) This offers a ready explanation on the one hand for the trend of formation of the highly divergent frequency of metamorphic clay-mineral -> mica 1.) K caolinite -> illite -> phengite -> sericite -> muscovite
