Chromium isotope compositions have been determined for 42 mantle-derived xenoliths from Cameroon, France, Mongolia, Russia and the USA. The samples are mainly spinel garnet lherzolites, or harzburgites, yield ?53CrNIST979 ?0.33 to 0.43‰, within range of previously reported compositions, ?0.51 0.74‰ (Xia et al., 2017). Partial melting has proposed as a process that alters ?53Cr mantle residue. N...

As seismic data from the lower crust becomes more readily available, it is important to link properties ongoing processes within crustal evolution. This includes high temperature, pre- and post-migmatization solid state deformation as well melt-present deformation. We selected two tonalitic migmatites with variable former melt content (one metatexite one diatexite) Daqingshan area, northern Nor...

48 We model the ascent and eruption of lunar mare basalt magmas with new data on crustal 49 thickness and density (GRAIL), magma properties, and surface topography, morphology and 50 structure (Lunar Reconnaissance Orbiter). GRAIL recently measured the broad spatial variation 51 of the bulk density structure of the crust of the Moon. Comparing this with the densities of lunar 52 basaltic and pi...

The Neoproterozoic rocks of the Bir Madi area, south Eastern Desert, comprise a metagabbrodiorite complex (GDC) and a tonalite-granodiorite suite (TGrS). The GDC has a weak tholeiitic to strong calc-alkaline character and is made up of olivine gabbro, hornblende gabbro, diorite and monzodiorite. The olivine gabbro is characterized by abundance of augite and labradorite with pseudomorphic serpen...

The central region of the mainland Lewisian gneiss complex of NW Scotland is a granulite-facies migmatite terrane.With the exception of ultramafic and rare calc-silicate rocks, all other lithologies partially melted during Neoarchaean, ultrahigh-temperature (Badcallian) metamorphism. The clearest evidence is preserved within large layered mafic^ultramafic bodies that exhibit macroscopic feature...

Seismological detections of complex structures in the lowermost mantle boundary layer (the D′′ region) motivate a conceptual model of a compositionally stratified thermo-chemical boundary layer (TCBL) within which lateral temperature variations (sustained by large-scale mid-mantle flow) cause variations of partial melt fraction. Partial melt fractions of from 0 to 30% in the TCBL occur due to t...

The recently discovered exoplanet Gl581d is extremely close to the outer edge of its system’s habitable zone, which has led to much speculation on its possible climate. We have performed a range of simulations to assess whether, given simple combinations of chemically stable greenhouse gases, the planet could sustain liquid water on its surface. For best estimates of the surface gravity, surfac...