Boev, Ivan and Boev, Blazo (2017) Silicic volcanism on Kozuf Mountains evidenced by tridimite and perlite in high-SiO2 sedimentary rock at Allchar caldera. Natural Resources and Technology, 11. pp. 33-42. ISSN 185-6966
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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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | volcanism, silicic, tridimite, perlite. |
| Subjects: | Natural sciences > Earth and related environmental sciences |
| Divisions: | Faculty of Natural and Technical Sciences |
| Depositing User: | Biljana Kosturanova |
| Date Deposited: | 23 Jan 2018 10:18 |
| Last Modified: | 23 Jan 2018 10:34 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/19080 |
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