PETROGRAPHIC AND GEOCHEMISTRY OF LAVA FLOWS FROM WEST OF HEZAR COMPLEX (RAYEN-KERMAN PROVINCE)

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KHAJEHJAVARAN ZAHRA; MORADIAN ABBAS

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Journal: GEOCHEMISTRY Year:2015 | Volume:4 | Issue:2 Page(s): 139-151

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Information Journal Paper

Title

PETROGRAPHIC AND GEOCHEMISTRY OF LAVA FLOWS FROM WEST OF HEZAR COMPLEX (RAYEN-KERMAN PROVINCE)

Author(s)

KHAJEHJAVARAN ZAHRA | MORADIAN ABBAS | Issue Writer Certificate

Keywords

RAYENQ2

HEZAR VOLCANIC COMPLEXQ2

EOCENE VOLCANICQ2

GEOCHEMISTRYQ2

CALC-ALKALINEQ2

Abstract

Hezar volcanic complex is the latest EOCENE VOLCANIC phase in the Kerman province, comprising of lavas (basalt, trachy-basalt, basaltic-trachy-andesite, trachy-andesite), pyroclastic and sedimentary rocks (in the western area). Petrographically, the lavas contain plagioclase, pyroxene, olivine, minor, and secondary minerals, with porphyritic and trachytic textures. Plagioclases and pyroxenes have a lesser degree of alteration and often show seriate texture, zoning and resorption and they are occasionally crushed. These evidence show disequilibrium condition as a result of pressure decrease during ascent to the surface. Large plagioclase crystals could be formed in the magma chambers and during the ascent of magma in the conduit. Geochemical investigations indicate that the lavas belong to CALC-ALKALINE magmatic series characterizing a volcanic arc setting. The origin of the lavas is partial melting of mantle in the garnet stability range.

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