Except for blueschist and eclogite
, the rocks used in the experiment are readily available in school rock collections or from Australian outcrops (Figure 6).
But other researchers have suggested some alternative explanations: Perhaps, these cratonic rocks are cooler than what the literature suggests, which means the rock will be stiffer -- and thus, seismic waves will travel more quickly through them -- even without the diamond or eclogite
rocks, Garber added.
Thickening of the crust caused the formation of eclogite
at the bottom of the lower crust.
Samples ARQ-228 and ARQ-379 corresponds to a garnet actinole schist and eclogite
and are located outside the MORB field, although verty near and following the same trend.
12a, b, samples fall mostly in the field of adakites derived from the partial melting of the thick lower crust and metabasaltic and eclogite
fields, rather than in that of adakite rocks derived from the partial melting of the delaminated lower crust.
xenoliths * Cat's-eye calcite from Pakistan * Large chatoyant Brazilian emerald * Nonbeadcultured pearls from Strombus gigas * Purple scapolite * Synthetic star sapphire with diffusion-induced colour and star * Partially filled blue chalcedony * Presumably oiled ruby * Inclusions in synthetic star sapphire * Diamond slices * Large Namibian demantoid * Nephrite from British Columbia * Baroque cultured pearls * Ruby from Namya, Myanmar * Rock Creek sapphire update * Unusual tourmaline necklace * Conference reports.
Upper mantle consist mostly of olivine, pyroxene, spinel-structure minerals, and garnet;  typical rock types are thought to be peridotite, dunite, and eclogite
. Between ~400 km and 650 km depth, olivine is not stable and it is replaced by high pressure polymorph is wadslevite and or ringwoodite.
This recycled oceanic crust was present in the plume as eclogite
, a very dense rock that made the hot mantle plume less buoyant.
This increase in the 'orogenic' crust density can be related to the presence of eclogite
and is consistent with previous numerical modeling of orogens (e.g., Schott and Schmeling, 1998; Jimenez-Munt et al., 2008).
and Hirschmann, M.M., 2003, Anhydrous partial melting experiments on MORB-like eclogite
: Phase relations, phase compositions and mineral-melt partitioning of major elements at 2-3 GPa: Journal of Petrology, v.
Further, Nordic Mining is undertaking large-scale project development at Engebo (Engebofjellet) in Sogn og Fjordane, western Norway, where it has rights to a substantial eclogite
deposit with rutile and garnet.
Early core drilling strongly suggested that the EJF Inner of ON-K120 was prospective for diamonds due to the abundance of eclogite
xenoliths and coarse kimberlite texture.