Volume 24, Issue 2 (7-2016)                   www.ijcm.ir 2016, 24(2): 371-384 | Back to browse issues page

XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Mineral chemistry and petrogenesis of the dacitic volcanic rocks from the Arvaneh cone, SW Bostanabad-East of Sahand Volcano . www.ijcm.ir 2016; 24 (2) :371-384
URL: http://ijcm.ir/article-1-107-en.html
Abstract:   (3379 Views)

The Arvaneh volcanic cone at eastern part of the Sahand volcanic complex is located on SW of Bostanabad city. This cone having lava composition as dacite, dacitic andesite and rhyodacite, is formed eletted to young volcanic activity of the Sahand volcanism. Having various colours and textures form dominant composition of the lavas in the Petrographycally phenocrysts are plagioclase+hornblende+biotite±quartz±K-feldespar. The dominante texture of the investigated rocks are hyaloporpyre and microlitic porphyre. Plagioclase are andesine and labradorite at the core and rim, respectively. The biotites are classified as Mg-bearing biotites on the basis of Si and FeO/(FeO+MgO) contents. The investigated biotites, having Mg/(Mg+Mg+Mn as 0.52-0.61, indicate relatively high oxegn fugacity corresponding to calc-alkaline magmatic series. Compositionally, the amphiboles are calcic indicating their crystallization related to subduction tectonic setting. Amphibole composition is supporting high fugacity of oxegen in the related magma. Petrogenesis of the lavas from Arvaneh cone are determined as active continental margion on the basis of biotite and amphibole mineral chemistry. Crystallization T-P are determined as 700-800 0C and 3-6 kbar respectively. On the basis of estimated pressures, it seems that oncet of phynocryst crystallization has been started from depth of 18 Km in the continental crust in the area.

Full-Text [PDF 126 kb]   (1075 Downloads)    
Type of Study: Research | Subject: Special

Add your comments about this article : Your username or Email:
CAPTCHA

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

© 2024 CC BY-NC 4.0 | Iranian Journal of Crystallography and Mineralogy

Designed & Developed by : Yektaweb