Melting experiments on the Udachnaya kimberlite at 6.3–7.5GPa: Implications for the role of H2O in magma generation and formation of hydrous olivine

Water contents of Roberts Victor xenolithic eclogites: primary and metasomatic controls

“…These estimates overlap the water content of kimberlitic magmas (5-10 wt%; Kavanagh and Sparks 2009;Sokol et al 2013), consistent with the interpretation that Type IB eclogites were modified by kimberlite-related melts/fluids shortly before eruption (Huang et al 2012a). Kimberlitic melts are part of a compositional spectrum extending to carbonatites (Gudfinnsson and Presnall 2005;Girnis et al 2011;Sokol et al 2013), which may contain less water than kimberlitic melts.…”

Origins of cratonic mantle discontinuities: A view from petrology, geochemistry and thermodynamic models

“…Numerous experimental studies have focused on the formation of melts under cratonic pressure-temperature-composition conditions, with the emerging consensus that both CO 2 and H 2 O are necessary for melting to occur in cratons (Foley, 1989;Foley et al, 2009;Brey et al, 2008Brey et al, , 2009Girnis et al, 2011;Novella and Frost, 2014;Sokol and Kruk, 2015;Sokol et al, 2013Sokol et al, , 2014Sokol et al, , 2015Sharygin et al, 2015). In most cases, experimental melts are low to very low in silica, spanning the compositional range from carbonatites to kimberlites.…”

Melting phase relations in the systems Mg2SiO4–H2O and MgSiO3–H2O and the formation of hydrous melts in the upper mantle

“…Menzies and Hawkesworth, 1987;Erlank et al 1987) and several exotic magma types such as kimberlites and lamproites are likely formed, at least in part, as a result of H 2 O lowering the mantle solidus (e.g. Kushiro et al, 1968;Kawamoto and Holloway, 1997;Sokol et al, 2013). H 2 O induced melting of the deep mantle has also been proposed to explain a number of geophysical observations such as the Earth's seismic low velocity zone (Lambert and Wyllie, 1970;Mierdel et al, 2007) and possible low velocity layers present on top of the transition zone (Tauzin et al, 2010) and immediately below it (Schmandt et al, 2014).…”