Mantle-melt evolution processes in the earliest stage of subduction initiation (SI) are still ambiguous. Here, we report systematic petrogeochemical and physical records SI demonstrated by Gomsiqe massif, Mirdita ophiolite. The ultramafic body consists basal lherzolites, upper harzburgites containing lentoid dunites disseminated chromitites, displaying transition petrological (Cr# spinels range...

Variations in the abundance of iron in the mantle may have important consequences for mantle dynamics and geochemistry. The abundance of iron in lavas derived from mantle source regions varies during partial melting and subsequent fractionation, so that source heterogeneities are not easily resolved in iron abundances alone. However, manganese is a geochemically similar element, so that the pla...

High pressure and temperature experiments were carried out on the oxide mixtures corresponding to bridgmanite stoichiometry under hydrous shallow lower mantle conditions (24–25 GPa 1673–1873 K with 5–10 wt. % of water in starting material). Oxide investigated correspond MgSiO3, (Mg, Fe)SiO3, Al, Si)O3, Fe, Si)O3. Melting was observed all runs. Partitioning various elements, including Mg, Si, H ...

Abstract The Oulongbuluke Block is an integral part of the Columbia and Rodinia supercontinents, but lack rock records from transitional period between supercontinents during mid–late Mesoproterozoic has impeded our understanding tectonic relationship Block, which lies supercontinents. In this contribution, we present a systematic petrographic, geochemical, zircon U-Pb-Hf investigation newly di...

We investigated mantle noble gas abundance ratios using a global compilation of data from mid-ocean ridge basalts (MORB) and high 3He/4He ocean island (OIB), coupled with calculated abundances based on closed-system evolution models. Assuming that the sources MORB OIB are derived same early Earth parental material, variations in their useful to ascertain which source is more depleted or degasse...