TITLE:
Petrology and Origin of Intrusive Masses of Zaker Located in NE of Zanjan
AUTHORS:
Mahboubeh Mansouri, Afshin Ashjae-Ardalan, Mohammad Lotfi, Jamal Sheikh-Zakariai
KEYWORDS:
Petrology, Granite, Alborz, Partial Melting, Iran
JOURNAL NAME:
Open Journal of Geology,
Vol.7 No.7,
July
21,
2017
ABSTRACT:
The study area, in east of Zanjan, with NW-SE trend exposed and structurally
is located in Alborz-Azarbaijan zone and Tarom subzone. The mass composition
is in monzogranite, quartz-monzonite, monzonite, quartz-monzodiorite
and monzodiorite range. It belongs to high K calc-alkaline to Shoshsonitic
magmatic series. According to the geochemistry and petrogenesis results, partial
melting of magma has been the important controlling process of rock variety
in the study area. All samples have negative anomalies of Nb that is related
to subduction and active continental coastline zones as well as high
anomalies of K, Rb and Ba explaining the role of continental crust or contamination
with the continental crust. Granitic volcanic arc related environments
and syenite alkali feldspar masses reflect the granite mass within the
plate. Monzonites and diorites point to the volcanic arc and syenite and granite
masses show within the plate environments.