Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   FALL 2006 , Volume 16 , Number 61 (GEOLOGY ISSUE); Page(s) 109 To 126.
 
Paper: 

PETROGRAPHICAL AND PETROLOGICAL STUDY OF OLIGO-MIOCENE LAVAS IN RAZAN-HAMADAN AREA

 
 
Author(s):  MOHAMMADI RAZIEH*, EMAMI MOHAMMAD HASHEM, VOSOUGHI ABEDINI M.
 
* GEOLOGY DEPARTMENT, SCIENCE AND RESEARCH CAMPUS, ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

The Razan (Hamadan) area is located about 300 Km of southwest of Tehran. The southern part of this area is belonging to Sanandaj-Sirjan and northern part belongs to Central Iran zones. The marine deposits of Oligo-Miocene (Qom Formation) are well distributed in the area. Lavas and volcanoc1astics are important parts of Qom Formation. These parts exposed in vast bond which has a SE-NW direction like general Zagros zone trend. Petrological study of lavas in Qom Formation is the most important aim in this research and it's based on field observation, petrographical and geochemical (XRF, Isotopic geochemistry and SEM analyses) study. This research show that extrusive rocks of studied area are dacite-ryodacite, andesite, trachyandesite, homblend andesite, basaltic andesite and trachybasalt. It also revealed that different phenomena like contamination and probably magma mixing had affected on extrusive rocks magma formative.

 
Keyword(s): RAZAN-HAMADAN, PETROLOGY, PETROGRAPHY, GEOCHEMISTRY, LAVA, OLIGO-MIOCENE, QOM FORMATION, ANDESITE
 
References: 
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