The study area is located in Ardabil province the northeast of Meshkinshahr city. More than 200 small and large Eocene-age dykes form outcrops this area. Laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) U–Pb zircon analyses yield a consistent age 44.3 ± 1.8 Ma for dyke swarms. These include tephritic, andesitic basaltic compositions, show enrichment LREEs (relative to HRE...

The effective patterns and mechanisms of synoptic systems during the wet and dry spells in Midwest of Iran(MWI) analyzed and discussed on seasonal scales from 1974 to 2003. Synoptic Analysis is based on synoptic chartson Sea Level Pressure (SLP), 850 and 500 Hpa levels. The results of synoptic analysis show that dry spells in MWIare mostly corresponded to Azores High (AZH) intensifying and its ...