TITLE:
Geochemistry and Petrogenesis of Intrusive Pluton in North of Golpayegan (Central Part of Sanandaj-Sirjan Zone)
AUTHORS:
Marzieh Shahpari, Afshin Ashja Ardalan, Mohammad Hashem Emami, Mohammad Ali Arian, Abdollah Yazdi
KEYWORDS:
Granitoid, Sanandaj-Sirjan Zone, Golpayegan
JOURNAL NAME:
Open Journal of Geology,
Vol.4 No.9,
September
26,
2014
ABSTRACT: Granitoid pluton in the
north of Golpayegan is located in10 kmnorth of Golpayegan at SanandajSirjan
zone. Dominant rocks of this region include granite, syenite, and gabbro.
Granite type is granular with medium to coarse crystals and its mineralogical
composition contains alkali feldspar + quartz + plagioclase + biotite +
secondary minerals (opaque + sphene + apatite). Granite rocks have
calc-alkaline andmetaluminous to
peraluminous nature, relative enrichment of Rb over Sr, and relative enrichment
of LILE over HFSE elements. These granites, which are type I, are derived from
the melting of metagreywackes and their tectonic setting is of upper
continental crust and post-orogenic setting. Gabbroic type is older than other
types of the pluton and is granular with medium to fine crystal. Mineralogical
composition of these rocks is plagioclase + pyroxene + amphibole + biotite +
secondary minerals (opaque). Based on geochemical characteristics of tholeiitic
and metaluminous nature, relative enrichment of Ba and Sr elements over Rb,
relative enrichment of LILE elements over HFSE, negative anomaly of Nb, Ba, and
Ta, and positive anomaly of Pb are observed. Origin of this type is probably
from enriched mantle and in-plane tectonic setting.