Abstract Cratonic lamproites are diamondiferous ultrapotassic rocks that emplaced through thick continental lithosphere and thought to derive from melting of metasomatized (i.e., geochemically enriched) regions the subcontinental lithospheric mantle (SCLM). We explored alternative hypothesis melts sourced sublithospheric convective mantle) sources dominate genesis cratonic lamproites. Supportin...

This study presents Ba isotope compositions of ocean island basalts (OIB) from the Azores Archipelago to investigate origin enriched components within their mantle sources. These samples have large variations in radiogenic Sr-Nd-Pb-Hf compositions, indicating that they tap highly heterogeneous They display two types characteristics. Samples Faial, Pico, São Jorge, and Miguel Islands exhibit hom...

[1] Adakitic melts from Papua New Guinea (PNG) show adakitic geochemical characteristics, yet their geodynamic context is unclear. Modern adakites are associated with hot-slab melting and/or remelting of orogenic mafic underplate at convergent margins. Rift-propagation over collision-modified lithosphere may explain the PNG adakite enigma, as PNG was influenced by rapid creation and subduction ...

Abstract Spinel peridotite xenoliths (one plagioclase-bearing) hosted in alkaline basalts from Tallante (southeast Spain) record the mineralogical and geochemical fingerprint of subcontinental lithospheric mantle (SCLM) evolution beneath southern Iberian margin. Mantle metasomatism fertile lherzolites caused crystallization clinopyroxene + orthopyroxene spinel clusters through percolation Mioce...

a r t i c l e i n f o Keywords: silica-undersaturated volcanism 238 U-230 Th-226 Ra-210 Pb series disequilibria magma transport and residence time carbonate metasomatism volcanic hazard assessment The silica-undersaturated Nyiragongo volcanics, located in the East African Rift, have globally unique chemical compositions and unusually low viscosities, only higher than carbonatite lavas, for terr...

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...