Investigations on the geotectonic environment of Abdasht peridotites, SE Kerman Province, using spinel chemistry
Subject Areas :Tayabeh Roudbari 1 , Mohsen Moazzen 2 , Seyed Hesamedin Moeinzadeh 3 , Abdolmajid ahangari 4
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Keywords: dunite spinel supra-subduction Abdasht Kerman,
Abstract :
Peridotites are one of the main rock types of the Abdasht ophiolitic complex in southern Iran. Peridotites of this ophiolite are dunite and harzburgite. The important original minerals in the peridotites include olivine, orthopyroxene, spinel and to the lesser amounts, clinopyroxene. Study of the chemistry of spinel in these peridotites shows that their composition, based on the end-member chemistry, is Spl0.4 Chr0.57 Mag0.03 to Spl0.46 Chr0.51 Mag0.03. The chromium number (Cr#) varies from 0.73 to 0.92 and the Al2O3 contents are3.61 to 11.29 wt%. The chemical compositions show that spinel is mantle residua phase and its high Cr content indicates the peridotites depletion. Spinel chemistry shows that the studied peridotites are related to supra-subduction environment at a fore-arc setting with boninitic features.
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