Role of metasomatism in the lodes environs of Gyöngyösoroszi (Mátra mountains, Hungary)

Mezősi József: Role of metasomatism in the lodes environs of Gyöngyösoroszi (Mátra mountains, Hungary). In: Acta mineralogica-petrographica, (20) 2. pp. 287-309. (1972)

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Absztrakt (kivonat)

The mineralogical-petrological investigation of the associated rocks of dead galleries connecting the veins was performed; the lodes lie in the mine of Gyöngyösoroszi in four levels (i. e. in heights of + 250, +300, +35 0 and +400 metres above sea level). In the mine's gangways Lower Tortonian andesite and andesite tuff can be found. The andesite consists partly of orthoandesite (in the level + 400 metres) and partly of hypomagmatic products of different texture with slight pyritization. Silicification, as well as clay mineralization in the faulted zones are common phenomena. On the basis of derivatographic investigations in the clay-mineralized associated rock the following clay minerals, resp. their assemblage could be determined among the secondarily formed minerals of the four levels: illite-type, montmorillonite-illite, montmorillonite-kaolinite, montmorillonite-jarosite, kaolinite with calcite, kaolinite with iarosite and calcite. In addition to the clay minerals in most of the cases gypsum occurred in considerable quantity. On the basis of the X-ray diffractometric investigations the following can be stated. Independently of the K20-content of the sample formation of sanidine and adularia, i. e. the replacement of plagioclases by potassium feldspars did not followed, the higher potassium content is connected to sericite-illite and not to the potash-feldspars. As a result of silicification quartz occurs in considerable quantity in the fresh rock, too. Out of the clay minerals illite-sericite, montmorillonite and kaolinite could be demonstrated, the definite zonal arrangement could not be observed. The description of iarosite from this mine hás not been referred yet. As a result of the investigation of the alkali content of different levels it is obvious that where the rock is fresh and no fault zone exists, in the neighbourhood of the lodes the high values concerning the K 2 0 were fourfd between 10 arid 25 metres. In the sites, however, where fault zone can be found the rock type is changing, the decomposition and clay mineralization are characteristic, the indication character of K.O is lost. According to the investigations performed up to now there is a relation between the K 2 0 and sulphide-S and the optimal value of it may be given between the weight per cent of 2.5 and 4.5 of K 2 0 and this may indicate the exploitable ores.

Mű típusa: Cikk, tanulmány, mű
Befoglaló folyóirat/kiadvány címe: Acta mineralogica-petrographica
Dátum: 1972
Kötet: 20
Szám: 2
ISSN: 0365-8066
Oldalak: pp. 287-309
Nyelv: angol
Kiadó: University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Kiadás helye: Szeged
Befoglaló mű URL: http://acta.bibl.u-szeged.hu/39391/
Kulcsszavak: Kőzettan, Ásványtan, Földtan
Megjegyzések: Bibliogr.: p. 307-309. ; ill. ; összefoglalás angol nyelven
Szakterület: 01. Természettudományok
01. Természettudományok > 01.05. Föld- és kapcsolódó környezettudományok
Feltöltés dátuma: 2016. okt. 17. 09:26
Utolsó módosítás: 2022. júl. 22. 11:52
URI: http://acta.bibl.u-szeged.hu/id/eprint/24547
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