Evidences for polyphased oceanic alteration of the extrusive sequence of the Semail Ophiolite from the Salahi Block (northern Oman)

Abstract

Field observations and mineralogical study indicate that the Salahi block extrusive sequence has been subjected to three stages of hydrothermal circulation and to low-temperature oceanic alteration that were contemporaneous with the three magmatic events of the Semail complex. The superposition of alteration phases accounts for the peculiarities of the metamorphic zonation in the volcanic member of this ophiolite. The origin of the Zuha mineralized zone is attributed to the hydrothermal phase activated by the second, off-axis, magmatic event. -from Author