Journal Paper

Paper Information

Journal: علوم زمین
Year:1390 | Volume:21 | Issue:81
Start Page:179 | End Page:190

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Title

SOURCE AND TECTONIC SETTING EAST OF SAHAND (SOUTHEAST OF TABRIZ) VOLCANIC ROCKS USING GEOCHEMICAL EVIDENCES

Pages

 Start Page 179 | End Page 190

Abstract

 In southeast Tabriz, as a part of WESTERN ALBOURZ-AZARBAIJAN magmatic belt the vocanic and pyroclastic rocks of SAHAND cover vast areas. The volcanic rocks include andesite, DACITE, rhyodacite and rhyolite and pyroclastic rocks largely occur as vast ignimbritic outcrops. Based on high LILE/HFSE and LREE/HREE ratios and their similar composition to SUBDUCTION volcanic rock suites; it seems that they have formed in a SUBDUCTION zone. The SUBDUCTION process had low effect on the concentration of Zr, Ta, Hf, Sm, Tb, Nd, Eu and Y, while it had strong influence on concentration of Th, U and La. Concentration of elements such as Ba, K, Rb, Cs, Sr, Pb shows that these rocks belong to calc-alkaline series. The studied rocks show considerable similarity with calc-alkaline rocks from Turkey and from this point of view; these rocks belong to post-collisional arcs. In this tectonic setting, magma ascent is controlled by strik-slip faulting and associated pull-apart extensional tectonics. This post-collisional magmatism may have occurred due to Arabian-Iranian plate's collision.

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