Peridotite - Wikipedia
网页Peridotite is the dominant rock of the upper part of Earth's mantle. The compositions of peridotite nodules found in certain basalts are of special interest along with diamond pipes (kimberlite), because they provide samples of Earth's mantle brought up from depths ranging from about 30 km to 200 km or more.
Transport of coexisting Ni-Cu sulfide liquid and silicate melt in ...
网页2020年4月15日 · Imaged sulfide-bearing partially molten peridotite using X-ray microtomography. Sulfide was stranded in locally connected melt networks under static conditions. Shear stress produced the alignment of …
Microtomography of Partially Molten Rocks: Three-Dimensional …
网页2011年4月1日 · Reconciling contradictory geochemical and geophysical observations at ocean ridges requires a better understanding of transport properties in partially molten rocks. Using x-ray synchrotron microtomography, we obtained three-dimensional data on melt distribution for mantle peridotite with various melt fractions.
Deep, hot, ancient melting recorded by ultralow oxygen ... - Nature
网页2024年7月24日 · Residual lherzolites from the ultraslow-spreading SWIR and Gakkel Ridge record fO2 values consistent with the global ridge peridotite and MORB datasets. By contrast, refractory harzburgites from...
Rapid diffusive infiltration of sodium into partially molten …
网页2000年2月3日 · Recent seismological, geochemical and experimental observations suggest that, as mantle peridotite melts, the resulting basaltic liquid forms an interconnected network, culminating in the rapid...
Depth-dependent peridotite-melt interaction and the origin of
网页2021年2月17日 · In this study, we compiled a comprehensive (n = 425) global data set of mineral modal abundances and major element compositions for Archaean cratonic peridotites (Table 1) and compared observed ...
Melt–rock interactions in a veined mantle: pyroxenite–peridotite ...
网页2022年2月16日 · At 1450 ∘C, pyroxenitic melt fluxes into molten peridotite, enhancing peridotite melting and creating a melt-bearing dunite associated with a refractory harzburgite. At a given pressure, bulk compositions of hybrid rocks originating through melt–peridotite interaction are mostly controlled by the chemistry of the reacting melt.
Reaction Infiltration Instabilities in Partially Molten Peridotite and ...
网页Reaction infiltration instability (RII) can cause the formation of melt channels and potentially facilitate the physical transport of sulfide liquid, which contributes to the geochemical evolution of chalcophile elements in the lithospheric mantle.
网页In the hydrostatic partially molten mantle, the distribution of melts evolves toward textural equilibrium to minimize the energy of melt-solid interfaces (von Bargen and Waff, 1986), while maintaining a constant dihedral angle (θ) at solid-solid-melt con-tact lines. And, the pore geometry of a melt-bearing system is
Well-wetted olivine grain boundaries in partially molten peridotite …
网页2009年6月15日 · The dihedral angles of olivine–silicate melt in partially molten peridotite were determined at pressures of 1 to 7 GPa and temperatures between 1473 and 1993 K. The dihedral angle decreased (approaching 0°) with increasing temperature, which corresponds to completely wetted grain boundaries.
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