2002•Unpublished venueRequires access

RODINGITIZATION OF IRANIAN BASIC ROCKS: A NEW INTERPRETATION

M Sabzehei

Abstract

Mineral paragenesis of rodingitized basic rocks of Iranian ophiolites are presented and metasomatic reactions between Ca +2 bearing aqueous fluids issued during serpentinization of host ultramafic rock – with magmatic minerals of basic rocks leading to present paragenesis of rodingites are discussed. It is concluded that Ca +2 rich aqueous fluid in equilibrium with serpentinite has high Ca +2 chemical potential to react with magmatic minerals of basic dykes resulting in lowering the free energy of system, appearance of a new mineral paragenesis and total or partial conversion of basic dykes to rodingites. A feedback mechanism is proposed to account for inter-relationship of serpentinization and rodingitization.

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Key concepts: Paragenesis, Metasomatism, Geochemistry, Ophiolite, Geology, Ultramafic rock, Mineral, Metamorphic rock