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Geochemistry of coexisting alkaline and calc-alkaline volcanic rocks from northern Azerbaijan (N.W. Iran)



Geochemistry of coexisting alkaline and calc-alkaline volcanic rocks from northern Azerbaijan (N.W. Iran)



Journal of Volcanology and Geothermal Research 11(2): 253-275



The Eocene volcanic rocks of northern Azerbaijan (N.W. Iran) are composed of four distinct associations: strongly undersaturated, alkaline, shoshonitic, and calc-alkaline. All four series are closely associated in space and time. They show many features common with rocks of orogenic zones such as low TiO2, MgO, Nb and high K2O, Ba, Sr, and light REE abundances. The rocks within each series are predominantly related by fractional crystallization. The contents of major and trace elements in the rocks are consistent with their derivation from an enriched upper mantle by variable degrees of partial melting. It is suggested that this enrichment process is related to a subduction zone accompanying the closure of the South Tethyan Sea during the Cretaceous, while melting occurred along deep-seated faults reactivated during Early Tertiary times.

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Accession: 019007452

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DOI: 10.1016/0377-0273(81)90026-3


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