Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   FALL 2006 , Volume 16 , Number 61 (GEOLOGY ISSUE); Page(s) 127 To 137.
 
Paper: 

PETROLOGY OF THE VOLCANIC ROCKS IN ALIABAD AREA, NORTHEAST OF QOM

 
Author(s):  RAZAVI SEYED MOHAMMAD HOSSEIN*, BEHZAD R.
 
* GEOLOGY DEPARTMENT, TEACHER TRAINING UNIVERSITY, TEHRAN
 
Abstract: 

Aliabad area is located northeast of Qom. Sedimentary rocks with Eocene, Oligocene and Miocene ages and quaternary sediments are present. Most of the area covered by pyroclastic and volcanic rocks which are affected by low metamorphism and alteration. Pyroclastic rocks are mainly tuff and ignimbrite and volcanic rocks are intermediate to basic olivine basalt, basalt andesiticbasalt and tracky-andesite. An intrusion with dykes and sills intruded Eocene pyroclastic rocks. Considering the geochemical diagrams, volcanic rocks are mainly sub-alkaline (calc-alkaline) type, but some samples show tholeiitic features. Microscopic studies and chemical analyses show magma contamination. Based on variety of rocks, basic to intermediate rocks are possibly formed from fractionation of basaltic magma with mantle source. However, based on presence of high volume of intermediate rocks and ignimbrite in the area, it is possible that they formed during partial meeting of the crust. The basic rocks formed in active continental margin.

 
Keyword(s): ALIABAD, QOM, ACTIVE CONTINENTAL MARGIN, PETROLOGY, MAGMA CONTAMINATION
 
References: 
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