Abstract Peridotite–magma interaction is important in establishing magma pathways through the mantle and metasomatism of lithospheric mantle. Reactions that consume orthopyroxene produce olivine clinopyroxene are particular interest because these reactions should lead to a redistribution trace elements between solid melt phases at equilibrium. This study examines silica-undersaturated alkaline ...

Deformation in the upper mantle is localized shear zones. In order to localize strain, weakening has occur, which can be achieved by a reduction grain size. for grains remain small and preserve zones, phases have mix. Phase mixing leads dragging or pinning of boundaries slows down halts growth. Multiple phase processes been suggested important during zone evolution. The importance process depen...

Mantle xenoliths in basalt and tuffaceous volcanoes at the Shawran Crater, Bir Ali area, along southeastern coast of Yemen are very useful to elucidate nature lithospheric mantle beneath which is characterised by rift tectonic activity volcanism during Pliocene–Quaternary period. The studied mostly fresh showing igneous textures composed mainly spinel harzburgite lherzolite, addition to, less p...

The studied serpentinites occur as isolated masses, imbricate slices of variable thicknesses and as small blocks or lenses incorporated in the sedimentary matrix of the mélange. They are thrusted over the associated island arc calc-alkaline metavolcanics and replaced by talccarbonates along shear zones. Lack of thermal effect of the serpentinites upon the enveloping country rocks, as well as th...

Abstract Diamonds are witnesses of processes that have operated in Earth's mantle over more than 3 b.y. Essential to our understanding these is the determination diamond crystallization ages. These cannot be directly determined on diamond, but they can calculated using radiogenic isotopic systematics suitable minerals included a diamond. This method relies assumption mineral inclusions were equ...