Mantle Source Characteristics of Javaherdasht Basalts (east of Guilan),Based on Attention to Geochemical and Isotopic Features

The Javaherdasht Basalts are situated in northern part of west-central Alborz. Geochemical surveys of major and trace elements and 143Nd/144Nd and 87Sr/86Sr isotopic ratios show that the source of the parent magma of basalts is from a MORB source astenospheric mantle with depleted Lherzolite composition and Spinel facies.This studies show that the basalts originated from less than 60 km depth in the pressures between 15-20Kbar which are contaminated with lower continental crust during magma rising.Due to the contamination, the basalts exhibit enriched zone properties untruth.