[SCG49-P07] Melt/fluid - rock reaction inferred from the Wadi Tayin mantle section in the southern Oman ophiolite
Keywords:Oman ophiolite, Mantle section, Peridotite, Melt/rock reaction
The plots in Cr# of spinel versus Ce/Yb ratio of clinopyroxenes show a linear trend with a positive correlation. It indicates that the LREE enrichment of clinopyroxene is associated with an increase in the degree of melting. Clinopyroxenes in the dunite from the shear zone are most significantly enriched in LREE to middle REE and have REE abundances being in equilibrium with the V2 lava. We consider that harzburgites were suffered from a flux melting by infiltration of H2O-rich fluid producing V2 lava. Comparing to the results from the northern massifs the linear trend in the diagram of Cr# of spinel versus Ce/Yb ratio of clinopyroxenes in the southern massif is obviously shifted toward lower in Cr#. It suggests that the infiltration of H2O-rich fluid may have started at early stage of melting in the Wadi Tayin massif relative to the northern massifs.
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