Petrology and geochemistry of Siahjangal ophiolite, northeastern Taftan volcano
Subject Areas :saeideh Nikbakht 1 , حبیب بیابانگرد 2 , Sasan Baghari 3
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Keywords: Siahjangal ophiolite, Tholeiitic, Supra-subduction, Sistan suture zone, Taftan volcano.,
Abstract :
Siahjangal ophiolite is located in the North and Northeastern part of Taftan volcano in the Sistan Suture Zone (SSZ). This ophiolite (Upper Cretaceous) is exposed in the Flysch rocks (Eocene). Harzburgite, lherzolite, serpentine, spilite and gabbro are major rocks in this ophiolite. Ultramafic units have olivine, orthopyroxene and clinopyroxene minerals. Mafic units have clinopyroxene and plagioclase. Ultramafic rocks have mainly granular and gabbro rocks have ophitic, sub-ophitic and granular textures. Geochemical verities of major, minor and rare earth elements in the Siahjangal ophiolite revealed that the ultrabasic and basic rocks were formed due to partial melting than crystal differentiation. REE elements diagrams normalized to the Chondrite and MORB and their comparison with the normal and enriched MORBs, chemical differentiation diagrams, the ratios of accessory elements and changes of Zr, Nb, Y, U, Ti elements against Zr / Nb ratio all indicates the similarity to N-MORB. Transition elements diagrams (V, Co, Cr, Ni) against La / Ce ratio and the ratio of (La / Yb) N, La / Yb, La / Ce versus (La / Sm) N, show that these ratios compared with N-MORB and E-MORB represent enrichment and geochemical similarities to N-MORB. Tectonomagmatic diagrams show Siahjangal ophiolite belongs to supra-subduction zone.
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