Journal Paper

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Journal: ژئوشیمی
Year:1392 | Volume:1 | Issue:4
Start Page:309 | End Page:317

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Title

PETROLOGY, GEOCHEMISTRY AND STRATIGRAPHIC SETTING OF DIABASIC DYKE SWARMS CROSSCUTTING THE BAND-E-HEZARCHAH GRANITOID PLUTON (SE SHAHROOD): AN EVIDENCE FOR MIDDLE CIMERIAN MAGMATISM

Pages

 Start Page 309 | End Page 317

Abstract

 Numerous mafic dike swarms are crosscutting the BAND-E-HEZARCHAH granitoid pluton (SE shahrood) Their host rocks consist of late Neoproterozoic-early Cambrian metaplitic, metapsammitic and gneissic rocks. These dykes crosscut Upper Triassic-Lower Jurassic conglomerates, sandstones and shales (equivalent to the Shemshak formation) and they don’t cut younger rocks such as lower Cretaceous (Neocomian) limestones. Based on geochemical characteristics, these rocks have alkaline to calk alkaline nature and their magma have been formed by 8-20% partial melting of spinel lherzolite sources. Thes rocks have formed in a continental arc setting to BACK ARC BASIN related to Neotethys oceanic lithosphere subduction beneath Central Iran microcontinent. The formation of these rocks is a result of magmatism related to the middle Cimmerian orogeny phase. Pb positive anomaly and Ba, Ce and K high values show crustal contamination of basic magma during rising and emplacement.

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