Abstract We report Zn-isotope compositions of garnet, clinopyroxene, and whole rocks for 14 Type I 10 II eclogites from the Roberts Victor kimberlite (Kaapvaal Craton, South Africa) that were previously analyzed Mg-O isotopes. are protoliths highly metasomatized I. Garnet clinopyroxene in have δ66Zn 0.14‰ to 0.50‰ 0.29‰ 0.58‰, respectively; reconstructed whole-rock is 0.24‰ 0.54‰, which higher ...

It is widely assumed that mineral inclusions and their host diamonds are 'syngenetic' in origin, which means that they formed simultaneously and from the same chemical processes. Mineral inclusions that, instead, were formed earlier with respect to diamonds are termed protogenetic. However, minerals can have the same age as the diamonds in that they become enclosed in and isolated from any furt...

The nature of source rocks of basaltic magmas plays a fundamental role in understanding the composition, structure and evolution of the solid earth. However, identification of source lithology of basalts remains uncertainty. Using a parameterization of multi-decadal melting experiments on a variety of peridotite and pyroxenite, we show here that a parameter called FC3MS value (FeO/CaO-3*MgO/SiO...

Ocean basins are formed when continents are broken apart. Adiabatic melt generation that is driven by rifting of continental lithosphere is strongly dependent on the rate of extension. Slow extension results in conductive heat loss from the upwelling mantle, whereas cooling is limited during fast extension and can result in the geotherm intersecting the peridotite solidus. However, there are fe...

The Cape Verde archipelago is a group of ocean islands in the Central Atlantic that forms two chains trending northwest and southwest. Several are considered to be volcanically active, with frequent eruptions on Fogo. We examine mineral chemistry thermobarometry southern islands—Santiago, Fogo, Brava—together Cadamosto Seamount. Our objective explore magmatic storage system implications for vol...

Abstract We present a new experimental dataset for reaction experiments between natural amphibole-clinopyroxene metasomes (hornblendite) and synthetic lherzolite that produced Na-rich alkaline melts. Experiments were conducted at 1, 3 4 GPa 1000–1300 °C. The generated melts range from foidite over basanite to phonotephrite. At 1 1000 1100 °C amphibole decompression-breakdown products generate p...