Cr-Spinel mineral chemistry and tectonic setting of LerdGarme-Paein peridotites in the East of Hajiabad, SE Iran

Poosti, M; Mohammadi Poortaziyani, R; Hajhasani, H; Mortazavi Ravari, S.M

doi:10.22071/gsj.2017.44067

Cr-Spinel mineral chemistry and tectonic setting of LerdGarme-Paein peridotites in the East of Hajiabad, SE Iran

Document Type : Original Research Paper

Authors

M Poosti ¹

R Mohammadi Poortaziyani ²

H Hajhasani ³

S.M Mortazavi Ravari ⁴

¹ Assistant Professor, Department of Geology, University of Hormozgan, Bandar Abbas, Iran

² M.Sc. Student, Department of Geology, University of Hormozgan, Bandar Abbas, Iran

³ M.Sc., Esfahan Regional Water Authority, Esfahan, Iran

⁴ Associate Professor, Department of Geology, University of Hormozgan, Bandar Abbas, Iran

10.22071/gsj.2017.44067

Abstract

The LerdGarm peridotite complex is one of the ultramafic complexes in south-east Iran . This complex is composed mainly of harzburgite dunite, lherzolite, and secondary listvenite and magnesite. The detailed electron microprobe study revealed very high Cr # (39.9-64.0), Mg # (51.2-65.63) and very low TiO₂ content (averaging 0.05 wt %) for chromian spinels in peridotites. The Fe³⁺# is very low (C± 60 at a pressure of 26 Kbar. Tectonic environment discrimination diagrams for dunites show a suprasubduction environment of the arc setting and for the harzburgite and lherzolites show abyssal environment.

Keywords

Cr-Spinel

LerdGarm

Hajiabad

Peridotite

SSZ