Abstract
Chemistry of accessory chromian spinel in serpentinites from the Penjwen ophiolite rocks, Zagros thrust zone,
Highlights
Chromiam spinel is common in small quantities in peridotites, and its compositions have often been used to determine the petrogenetic conditions of evolving mafic magmas (Irvine, 1965)
More recently it has been recognized that chromites formed in mafic melts in different tectonic environments have compositional differences and so chromite has become a powerful indicator of the former tectonic setting of mafic and ultramafic rocks (Kamenetsky et al, 2001)
Altered chromiam spinel occurred in serpentinized peridotites and serpentinites rocks as a result of serpentinization and regional metamorphism processes (Eales et al, 1988; Burkhard, 1993 and Melline et al, 2005)
Summary
Chromiam spinel is common in small quantities in peridotites, and its compositions have often been used to determine the petrogenetic conditions of evolving mafic magmas (Irvine, 1965). Altered chromiam spinel occurred in serpentinized peridotites and serpentinites rocks as a result of serpentinization and regional metamorphism processes (Eales et al, 1988; Burkhard, 1993 and Melline et al, 2005). This paper discusses the petrology of ultramafic rocks and chemistry of accessory chromian spinel from serpentinized alpine peridotites of Penjwen ophiolite complex, Zagros thrust zone, northeastern Iraq to conclude the genesis and tectonic environments of these rocks.
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