- Maden Tetkik ve Arama Dergisi
- Vol: 155 Issue: 155
- WHOLE ROCK GEOCHEMISTRY AND TECTONIC SETTING OF JURASSIC AGED LISAR GRANITE, TALESH MOUNTAINS, NORTH...
WHOLE ROCK GEOCHEMISTRY AND TECTONIC SETTING OF JURASSIC AGED LISAR GRANITE, TALESH MOUNTAINS, NORTH IRAN
Authors : Roghieh Bozorg Seghinsara, Hossein Sheikhi Karizaki, Mohssen Moazzen, Mohsen Pourkermani, Afshin Ashja Ardalan
Pages : 99-113
Doi:10.19111/bulletinofmre.336499
View : 17 | Download : 8
Publication Date : 2017-12-03
Article Type : Research
Abstract :The Late Jurassic aged Lisar granite in North Iran is in tectonic contact of the form of thrust and strike slip faults with Upper Cretaceous sandy limestone and is covered by Paleogene polygenetic conglomerate in the Talesh Mountain at the western continuation of the Alborz range. The rock samples of the granite are pink coloured and coarse-gained with K-feldspar, quartz, plagioclase, biotite and amphibole. The Lisar granite is more likely emplaced in an extensional environment indicated with numerous space fi lling silica-rich aplitic veins in the rocks. The granite samples are moderately altered and feldspars are changed to sericite and clay minerals and biotite is partially converted to chlorite. The Lisar granite has derived from a high K magma and is A-type in nature, belonging to A2 subgroup. The rock samples of granite are characterized by distinct negative Eu anomaly and a decrease from LREE to HREE contents. The parental melts of the granite were generated from partial melting of a lower continental crustal source with possible contribution from the mantle materials. The Lisar granite represents Cimmerian post-collision magmatism in north Iran following closure of Palaeotethys Ocean and subsequent collision.Keywords : A-type granite, Palaeotethys, Post-collision, Cimmerian, Talesh, North Iran