Paper Information

Journal:   IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY   SUMMER 2014 , Volume 22 , Number 2; Page(s) 57 To 68.
 
Paper: 

GEOCHEMISTRY AND PETROGENESIS OF THE SABALAN PLIO-QUATERNARY VOLCANIC ROCKS: IMPLICATION FOR POST-COLLISIONAL MAGMATISM

 
 
Author(s):  SHAHBAZI SHIRAN H.*, SHAFAII MOGHADAM H.
 
* DEPARTMENT OF ARCHAEOLOGY, UNIVERSITY OF MOHAGHEGHE ARDABILI, ARDABIL, IRAN
 
Abstract: 

Trachyandesites, trachytes and latites associated with ignimbrite and pyrocalstic rocks, characterized by shoshonitic affinity are the main Plio-Quaternary volcanic rocks in the Sabalan region (Ardabil). Plagioclase, K-feldspar, biotite associated with clinopyroxene and glass are the main constituents of these lavas. Plagioclases are andesine to labradorite while clinopyroxenes have augitic composition. The Sabalan volcanic rocks show enrichment in LREE relative to HREE and are characterized by enrichment in LILE and depletion in HFSE. Petrological observations along with geochemistry of rare earth and trace elements of these lavas suggest shoshonitic affinity and derivation from a subduction zone. The Sabalan volcanic rocks are isotopically characterized by derivation from an enriched mantle source (with/without crustal influence) with tendency to plot in a field defined by island-arc basalts (IAB) and OIBs (in eNd vs. 87Sr/86Sr diagram). The geochemical and isotopic signatures of the Sabalan lavas suggest that their magma has been issued via low degree partial melting of a subduction-metasomatized continental lithospheric mantle. The formation of these lavas is linked to slab steepening and break-off in a post-collisional regime.

 
Keyword(s): GEOCHEMISTRY, SR-ND ISOTOPES, PETROGENESIS, PLIO-QUATERNARY LAVAS, SABALAN
 
References: 
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