We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
СИЛИЦИСКИ ВУЛКАНИЗАМ НА КОЖУФ ПЛАНИНА ДОКАЖАН СО ПРИСУСТВОТО НА ТРИДИМИТ И ПЕРЛИТ ВО ВИСОКО-SiO<sub>2</sub> СЕДИМЕНТНИТЕ КАРПИ ВО КАЛДЕРАТА АЛШАР
- Authors
Боев, Иван; Боев, Блажо
- Abstract
The volcanic caldera Allchar is located in the western area of the volcanic complex in the Kozuf Mountain at the frontier of the Vardar zone and the metamorphic complex Elen Supe, a relic of the old Precambrian continental crust. The volcanic activity in this area of the volcanic complex in the Kozuf Mountain is represented by igneous rocks with Dacitic-Rhyolitic composition. There are many sediment pyroclastic rocks in the composition of the caldera, represented by volcanoclastic tuffs with layers of tridymite and layers of perlite. Tridymite appears in layers, few meters thick and its color is white. Tridymite and perlite are usually associated with Silicic volcanism. There is also crystobalit and smaller amount of opal in tridymit's composition. The appearance of opal is due to the diagenetic changes of the high temperature SiO2 glass. This paper presents the mineralogical and geochemical investigations of tridymite and perlite using XRD, FUS-ICP-MS, SEM-EDS methods. Normalized values of the rare element earth show distribution in the same manner as in the igneous rocks at the volcanic caldera of Allchar.
- Subjects
VOLCANISM; PERLITE; SILICIC acid; GEOLOGY; MINERALOGICAL research; SEDIMENTARY rocks
- Publication
Natural Resources & Technology, 2017, Vol 11, Issue 11, p33
- ISSN
1857-6966
- Publication type
Article