Abstract The thick mantle lithosphere beneath cratons consists of strongly reduced rocks that have reacted with oxidized melts. These low-silica, incipient melts are rich in CO 2 and H O react surrounding forming an enriched zone at the base lithosphere, which is source region for many diamonds. Here, we reproduce these reactions novel experiments oxidised, hydrous carbonate-rich reduced, deple...

Abstract There is abundant evidence for significant H2O in evolved melts from the platinum-rich UG2 chromitite and Merensky Reef of Bushveld Complex (South Africa), but there no consensus about source H2O. We report triple-oxygen hydrogen isotope ratios interstitial, late-magmatic phlogopite three localities layer. The yielded δD values −43 to −23, which >30 higher than previously known ...

marbles containing high-pressure mineral assemblage was found from the sanandaj-sirjan metamorphic belt in the nahavand area in western iran.  the high-pressure marbles occur as small bodies or lenses within pelitic schist layers and show compositional banding of carbonate- and silicate- rich bands.  textural analysis revealed two metamorphic stages.  the early stage is testified by relicts of ...

Modern plate tectonic brings down oceanic crust along subduction zones where it either dehydrates or melts. Those hydrous fluids or melts migrate into the overlying mantle wedge trigerring its melting which produces arc magmas and thus additional continental crust. Nowadays, melting seems to be restricted to cases of young (< 50 Ma) subducted plates. Slab melts are silicic and strongly sodic (t...

Among the marble-hosted ruby deposits in Himalayan tectonic belt, which yields highest-quality rubies world, Yuanjiang deposit is only economically viable one located China. More attempts are necessary to put constraints on ore-forming age of these deposits. Here, we dated rutile inclusions using LA-ICP-MS U–Pb method, yielded a lower intercept 206Pb/238U 20.2 ± 1.2 Ma Tera-Wasserburg plot, clo...

Macor coatings on 316 alloys substrates were prepared by plasma spraying. The crystallization temperature, thermal expansion coefficient of mica glass-ceramic were at 900ºC and 40× 10−7/◦C respectively. The microhardness of obtained glass-ceramic coating was 6.8GPa and the coefficient friction was 0.98 .