Abstract The lithospheric mantle as sampled by peridotite xenoliths in some continental settings resembles the source of mid-ocean ridge basalts (MORB). Whether this resemblance is a primary feature or result post-formation secondary processes remains controversial. Here, age, origin and thermochemical evolution fertile are constrained based on chemical composition minerals spinel-facies lherzo...

A series of high temperature experiments was undertaken to study partitioning of several highly siderophile elements (HSE; Ru, Rh, Pd, Re, Os, Ir, Pt and Au) between Cr-rich spinel, olivine, pyroxene and silicate melt. Runs were carried out on a Hawaiian ankaramite, a synthetic eucrite basalt, and a DiAn eutectic melt, at one bar, 19 kbar, and 20 kbar, respectively, in the temperature range of ...

24 25 Cenozoic alkaline lavas from the Al Ashkharah area, facing the Indian ocean along 26 the North-East Oman coastline, contain numerous small (‹ 2cm) mantle xenoliths. 27 They provide a unique opportunity to investigate the nature and evolution of the 28 upper mantle beneath the Oman passive margin, bordering the Owen Basin. All 29 studied xenoliths are porphyroclastic to equigranular spinel...

Ultra-calcic ankaramitic magmas or melt inclusions are ubiquitous in arc, ocean-island and mid-ocean ridge settings. They are primitive in character (XMg 4 0 65) and have high CaO contents (414 wt %) and CaO/Al2O3 (41 1). Experiments on an ankaramite from Epi, Vanuatu arc, demonstrate that its liquidus surface has only clinopyroxene at pressures of 15 and 20 kbar, with XCO2 in the volatile comp...