A substantial amount of subducted basaltic crusts may exist in the lower mantle. It features distinct chemical composition from peridotitic mantle and plays important roles dynamic evolution Earth's interior. However, mineral phases present crust is still poorly constrained. Here, we determined phase relations normal mid-ocean ridge basalt (MORB) up to 52 GPa at 2000 K by multi-anvil press. Thr...

Ž . We report Inductively Coupled Plasma Mass Spectrometer ICP-MS trace element concentration data for 21 elements in Ž 51 basaltic glasses recovered from 58 stations along a 1500-km segment of the equatorial mid-Atlantic Ridge MAR; 58N to . Ž 58S . Isotope systematics of these glasses revealed mixing between two isotopically distinct Schilling, J.-G., Hanan, B.B., McCully, B., Kingsley, R.H., ...

Wadi Ghadir ophiolite in the Egyptian Eastern Desert, which forms northern part of Nubian Shield, is considered as one best-preserved segments Neoproterozoic oceanic lithosphere on Earth. Primary melt calculations and thermodynamic modeling new geochemical data for pillow lavas dike complexes, integrated with comprehensive petrographic investigations, are here employed to unravel geodynamic evo...

Pyroxenite-peridotite sequences from the External Liguride (EL) Jurassic ophiolites (Northern Apennines, Italy) consist of portions fertile MORB mantle that were modified by deep melt infiltration and melt-peridotite reaction. They represent an excellent natural example a MORB-like veined including unmodified peridotite, pyroxenite layers metasomatized peridotite. We carried out spatially contr...

This paper reports the first discovery of basic igneous rocks in Bairin Right Banner southeastern Inner Mongolia, China. To understand genesis and tectonic evolution these rocks, we have carried out geochronology geochemistry research on them. The results show that LA-ICP-MS zircon U-Pb concordant mean ages massive basalt, diabase, pillow basalt are 272.0 ± 2.8 Ma, 261.5 3.2 256.5 2.5 respectiv...

Molybdenum and uranium are redox sensitive elements that experience isotope fractionation in the Earth-surface environment. Recent studies have explored transfer of these fractionated signals subduction zones to arc magmas, but less is known about full variation isotopic tracers mantle, particularly domains mantle may feed hot spots. Here, we present Mo U data for lava samples from Pitcairn, Sa...

the nain and ashin ophiolites are located in northeastern isfahan province, in western central-east iranian microplate. pillow lavas are one of the most significant cretaceous rock units. the lower partial melting degree in mantle peridotites of ashin ophiolite, and the derived melt by melting their clinopyroxene caused a more basic (basalt) and enriched nature for the ashin pillow lavas, where...

New H2O, CO2 and S concentration data for basaltic glasses from ‘hotspot’, with temperature differences of 200°C or more between hotter upwelling plumes and the ambient mantle Loihi seamount, Hawaii, allow us to model degassing, assimilation, adiabat (e.g. White & McKenzie, 1989; Campbell, 1998; and the distribution of major volatiles within and around the Davies, 1998). In contrast, it has lon...