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Authigenic mica in Early Miocene volcaniclastic rocks of the Macelj area, Hrvatsko zagorje, Croatia (CROSBI ID 104704)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Tibljaš, Darko ; Šćavničar, Stjepan ; Molin, Gianmario ; Slavković, Renata Authigenic mica in Early Miocene volcaniclastic rocks of the Macelj area, Hrvatsko zagorje, Croatia // Neues Jahrbuch für Mineralogie Monatshefte, (2004), 2; 69-82-x

Podaci o odgovornosti

Tibljaš, Darko ; Šćavničar, Stjepan ; Molin, Gianmario ; Slavković, Renata

engleski

Authigenic mica in Early Miocene volcaniclastic rocks of the Macelj area, Hrvatsko zagorje, Croatia

In the Early Miocene zeolitized volcanicalstic rocks from NW part of Hrvatsko zagorje green authigenic mica occurs in thin veins and coatings of glass shard vesicles. X-ray powder pattern with widened but still relatively sharp reflections is characteristic for 1M micas, with Fe-rich octahedral sheet. The observed value d(060) is 1.508 &Aring ; . IR spectrum is characterized by sharp absorption bands in the OH stretching region, with two strongest bands at 3580 cm-1 and 3600 cm-1 ascribed to Al-Fe3+ and Al-Mg cationic environment of the OH groups. Microprobe analyses revealed that this is an interlayer-deficient dioctahedral mica, with Al as dominant cation in octahedral sheet, viM3+>1.2, and low tetrahedral substitution, with quite peculiar chemical composition that does not correspond ideally to any member of the mica group.

altered volcaniclastics; authigenic mica; celadonite; Croatia; glauconite; Miocene

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Podaci o izdanju

(2)

2004.

69-82-x

objavljeno

0028-3649

Povezanost rada

Geologija

Indeksiranost