MINERALOGY AND GEOCHEMISTRY OF SPINELS IN HARZBURGITES, SERPENTINITES AND LISTWAENITES IN THE SOUTH OF NAEIN OPHIOLITE

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KARIMZADEH HAMID

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Journal: GEOCHEMISTRY Year:2015 | Volume:4 | Issue:3 Page(s): 219-229

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Title

MINERALOGY AND GEOCHEMISTRY OF SPINELS IN HARZBURGITES, SERPENTINITES AND LISTWAENITES IN THE SOUTH OF NAEIN OPHIOLITE

Author(s)

KARIMZADEH HAMID | Issue Writer Certificate

Keywords

MINERALOGYQ2

GEOCHEMISTRYQ2

SPINELQ3

LISTWAENITEQ2

SOUTH NAEIN OPHIOLITEQ2

Abstract

The peridotite rocks of Naein ophiolite compose about 70 percent of ophiolitic mélange of Naein. The rocks are mantle peridotites of an oceanic lithosphere that have been emplaced in Late Cretaceous to Early Tertiary time. Ophiolitic complex of the mantle section, includes harzburgite, dunite, lherzolite, wehrlite and pyroxenite. Harzburgites are very volouminous in comparison to the other peridotites. Serpentinized harzburgite have been listwaenitized in environments with favorable pH and Eh. Harzburgites, serpentinites and LISTWAENITEs contain SPINEL minerals. The SPINELs are most significant minerals with compositional variations. SPINEL group minerals have also many applications in the industry. So that, the Cr and Al in these minerals can be indicators to determine the origin of the country rocks. Chrom-spinels composition are different in minerals crystallized in different environments, and crystallization environment and alterations are the most important factors influencing the composition of chrom-spinels. Mineralogical and geochemical variations of SPINELs during the process of the serpentintization and the following listwaenitization shows an increase in Cr2O3, Cr #, TiO2 and decrease in Fe3+ and the MgO, Mg # and Al2O3; demonstrating the SPINEL formation in different conditions of pressure and temperature.

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