Petrological study of the Wadi Tayin mantle section in the southern Oman mantle section with special reference to the influence of the supurasubduction zone magmatism

Abstract

The mineral composition of mantle peridotite was evaluated in Wadi Tayin mantle section of southern Oman ophiolite. We revel the spatial distribution of spinel Cr# [=Cr/(Cr+Al) atomic ratio] of harzburgite and dunite. The Ce/Yb ratio of Cpx trace element suggests that flux-melting of the mantle peridotite. The dunite with high Cr# (=0.68) spinel shows the negative anomaly in the HFS elements such as Nb and Ta in the C1 chondrite-normalized pattern. This may indicate that a dehydrated fluid from the subducted slab reacted with harzburgite to produce the dunite described above.