Antigorite is the main carrier of water in Earth’s subduction zones. The dehydration processes antigorite were investigated by carrying out situ phase transition experiments using a dynamic diamond anvil cell, with time-resolved Raman scattering system, at 0.3–10 GPa and 396–1100 K. Three typical transformation reactions occurred within P–T range this study, corresponding to three reaction prod...

[1] Synthetic olivine samples ranging in composition from forsterite to fayalite are analyzed in the midinfrared using thermal emission, specular and diffuse reflectance, and attenuated total reflectance spectroscopies to study the spectral effects of Mg‐Fe solid solution. For each method, fundamental bands gradually change in position and strength from Mg2SiO4 at larger wave numbers to Fe2SiO4...

Boron is a typical crustal element and largely incompatible in olivine. Most natural olivine samples have very low concentrations of boron. Recently, forsterite with high boron content (up to 60.53 wt% MgO 1795.91 ppm B) has been discovered the Jian jade area northeast China. In this study, B-rich was examined by electron microprobes, Laser Ablation-Inductively Coupled Plasma Mass Spectrometry,...

Biocoatings were formed on the surface of Mg0.8Ca alloy by method micro-arc oxidation, in an electrolyte containing β-Ca3(PO4)2 (β-TCP) and CaSiO3, When process voltage was varied range 350–500 V, thickness, roughness, mass coatings increased to values 110 µm, 12 11 mg, respectively. The presence following crystalline phases determined coatings: α-TCP, wollastonite, forsterite magnesium oxide. ...

The lifetime of reactive sites on the surfaces of irradiated lunar dust grains is of interest to anyone studying human health effects because of the free radicals and toxic compounds that may be formed and may not passivate quickly when exposed to habitat/spacecraft air. One of the major activators of lunar regolith grains may be ultraviolet (UV) radiation, but the contribution of UV radiation ...

We present evidence that a rock sample found in the Koryak Mountains in Russia and containing icosahedrite, an icosahedral quasicrystalline phase with composition Al(63)Cu(24)Fe(13), is part of a meteorite, likely formed in the early solar system about 4.5 Gya. The quasicrystal grains are intergrown with diopside, forsterite, stishovite, and additional metallic phases [khatyrkite (CuAl(2)), cup...

Reflectance spectra of olivines spanning the forsterite-fayalite solid-solution series have been analyzed with the modified Gaussian model (MGM). The compositional variability of the three primary absorption bands that constitute the diagnostic 1.0-gm olivine feature has been quantified by examining the centers, widths, and relative strengths in 18 spectra ranging in composition from Mg-rich fo...