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The mantle-sequence peridotites of the Darvel Bay Ophiolite are represented predominantly by depleted harzburgites. These rocks are characterised by mineral chemistry of spinel XCr = 39, XMg = 61; olivine Fo = 90 and orthopyroxene (Opx) En = 88-90, Al20 a - 3.4 wt.%, CaO = 1.8 wt.%), suggesting a mantle residue which has undergone a moderate to high degree of a previously depleted source (oceanic upper mantle). Composition ofspinelXcr-Opx (Al 20 a) and bulk-chemistry indicate - 20% partial mel~ing of this source. The Darvel Bay harzburgites are less depleted (refractory) mantle than the harzburgItes of Oman, Papuan and Halmahera Ophiolites. The Darvel Bay harzburgites represent a supra-subduction zone (SSZ)-ophiolite type, supported by bulk-rock chemistry of Ti02 contents. The tectonic evolution model of the Darvel bay Ophiolite is much easier to explain using a model of supra-subduction zone (SSZ) ophiolite accreting new material in a forearc region.

Petrology and geochemistry of the mantle-sequence peridotite of the Darvel Bay Ophiolite, Sabah,Malaysia