PETROLOGICAL, PETROGRAPHICAL AND GEOCHEMICAL STUDY OF THE PLUTONIC ROCKS FROM EAST OF HERIS, EAST AZARBAIJAN, NW IRAN

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AMERI A.; ASHRAFI N.; KARIMI GHAREH BABA H.

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Journal Paper

Paper Information

Journal: GEOSCIENCES Year:2006 | Volume:15 | Issue:59 Page(s): 150-161

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Information Journal Paper

Title

PETROLOGICAL, PETROGRAPHICAL AND GEOCHEMICAL STUDY OF THE PLUTONIC ROCKS FROM EAST OF HERIS, EAST AZARBAIJAN, NW IRAN

Author(s)

AMERI A. | ASHRAFI N. | KARIMI GHAREH BABA H. | Issue Writer Certificate

Keywords

HERISQ3

GRANITOIDQ2

MAGMA MIXINGQ2

POST COLLISION ARCQ3

Abstract

The study area, a part of Alborz-Azarbaijan zone, is located in about 20 km east of HERIS district, NW Iran. The plutonic rocks are diorite, granodiorite, quartzdiorite and quartz-monzodiorite of the Middle-Upper Eocene, intruded into the Eocene volcanic rocks. Magmatic and hydrothermal fluids derived from the magma altered both plutonic and volcanic rocks. The texture of GRANITOID rocks are granular, porphyritic nicto granular and the rock - forming minerals are plagioclase, alkali feldspar, quartz, augite, hornblende, zircon and apatite. Petrographical studies show that nonequilibrium textures such as acicular apatites, skeletal hornblendes and abnormal zoning in plagioclases can be regarded as an evidence of mixing of an acid and basic magma. Field, petrological and geochemical investigations show that the GRANITOIDs are I-type, high K, calc alkaline, meta-aluminous and belonge to continental arc or POST COLLISION ARC.

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