Introduction: Traditionally, the diogenite meteorites have been viewed as orthopyroxenite cumulates with small amounts of olivine [1]. Several olivine-rich, harzburgite diogenites have recently been recognized and may provide insight into the occurrence of olivine on Vesta and in the HED meteorite suite [2,3]. In both the harzburgite and orthopyroxenite diogenites, olivine has been interpreted ...

Research subject. The research covered the geological position, material composition and rock age of a comparatively small (about 32 km 2 ) Bystrinskii gabbro massif. This massif underlies tectonic plate package consisting serpentinized dunits harzburgites ophiolite association in Eastern boundary Middle Urals. Methods. content petrogenic elements was measured by Х-ray fluorescence method using...

The Dinaride Ophiolite Belt formed from the Jurassic part of Neotethys. investigated Ozren ophiolite complex in Bosnia and Herzegovina consists peridotites, plagioclase plagiogranites, troctolites other gabbroic rocks, fewer basalts. Lherzolites harzburgites contain corroded ortho- clinopyroxene1 porphyroclasts enclosed olivine matrix. boundaries between aggregates pyroxene1 spinel1 are infille...

Eighteen samples from the south-western part of Ronda lherzolitic massif have been analysed with bulk-rock and in-situ techniques to unravel fate Cu, platinum-group element chalcogens (S, Se) in a middle Proterozoic subcontinental lithospheric mantle segment variably overprinted by kilometre-scale porous flow percolation asthenosphere-derived silicate melts during Alpine orogeny. Chalcogen elem...

Volcanic deposits from the lake Nyos contain ultramafic xenoliths: lherzolites, harzburgites and wehrlites, sometimes containing amphiboles phlogopites. The lithospheric mantle beneath Nyos, as inferred chemical diagrams, has experienced partial melting variably cryptic modal metasomatism of two groups samples that have been distinguished: Group 1 are characterized by spoon-shaped REE patterns,...

Clinopyroxene bearing spinel harzburgites recovered from Cenozoic alkaline basalts the Kapsiki plateau were investigated with aim of understanding depletion and enrichment processes in subcontinental mantle below a major tectonic line. Concentrations trace elements (including H) determined in-situ olivine, orthopyroxene, clinopyroxene by EPMA, LA-ICP-MS FTIR. The xenoliths are refractory high o...

Ultramafic massifs are minor but meaningful components of orogens because they record the mantle properties and processes plate generation, subduction, accretion, collision, thus providing key information about crust-mantle interaction evolution orogens. Here, we present an integrated study field observations, whole-rock mineral geochemistry, zircon U-Pb ages, Sm-Nd Re-Os isotopes for serpentin...

Abstract Devolatilization of subducting lithologies liberates COH-fluids. These may become partially sequestered in peridotites the slab and overlying forearc mantle, affecting cycling volatiles fluid mobile elements subduction zones. Here we assess magnitudes, timescales mechanism channelized injection COH-fluids doped with $${\mathrm{Ca}}_{\mathrm{aq}}^{2+}$$ <mml:math xmlns:mml="http://www.w...

The Canary Islands, in the eastern Atlantic, are among most enigmatic Oceanic Island provinces on Earth, as mantle source feeding its volcanism exhibits wide spatial heterogeneity and a multiplicity of sources. Multi-isotope whole-rock studies have long revealed presence recycled oceanic crust/lithosphere component source. However, noble gas systematics been more challenging to interpret, avail...