Document Type : Original Research Paper
Authors
1 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
2 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran
Abstract
At the farthest end of NW Iran, the Quaternary basalts crop out in Azerbaijan province, located in Alpine – Himalaya belt and highly pleatue of Iran-Turkish, eastern Anatolian. The Quaternary volcanic units of NW Azerbaijan cover a broad compositional range from basalts, basaltic andesite, trachy andesite to trachyte. These rocks are erupted from deep tension, strike-slip faults in a pull a part basin and volcanic centers. Source of primary magmas and crustal contamination processes have certainly contributed to the understanding of the origin of basaltic rocks. Based on field area, petrography and petrology studies, 10 samples were selected for 143Nd/144Nd and 87Sr/86Sr measurements. The obtained results were correlated with other isotopic data of similar Quaternary basaltic rocks from Turkey. Isotopic study indicates that all of these rocks are derived from mantle and plot in Bulk Earth field and mantle array. The basaltic rocks in the northern area are derived from a depleted mantle and those from the southern area shows contamination by crust.
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