Chlorite is the most common accessory mineral group found in high purity talc ore used in cosmetic or pharmaceutical consumer talcum products. X-ray diffraction and wet chemical analytical data obtained on geologic samples representing commercial talc ore deposits of high purity and on processed samples representing talc found in consumer talcum products indicate that clinochlore and penninite ...

Field observations within the Atg-serpentinite domain of subducted ultramafic massif from Cerro del Almirez (SE Spain) reveal existence two generations abundant olivine-rich veins formed as open, mixed mode and shear fractures during prograde metamorphism. Type I were synchronous with development serpentinite main foliation (S 1 ) shearing, whereas II post-date S surfaces. These structural rela...

Exotic blocks of massive antigorite-serpentinite (antigoritite) document a deep-seated subduction channel in the Villa Clara serpentinite-matrix mélange, central Cuba. The petrological and geochemical characteristics antigoritite allow distinguishing two types rock: i) ii) dolomite-bearing antigoritite. Both are intimately related field exposures represent deep peridotite infiltrated by H2O-CO2...

Serpentinite rocks testify to the ocean-floor metamorphism that took place and transformed original mineralogy fabric of previous ultramafic rocks. Due their tectonic petrological importance, in recent decades, there has been increasing interest serpentinites. From economic point view, it is worth noting that, due beauty attractiveness, serpentinite have exploited traded as building ornamental ...

Subduction zones modulate the chemical evolution of the Earth's mantle. Water and volatile elements in the slab are released as fluids into the mantle wedge and this process is widely considered to result in the oxidation of the sub-arc mantle. However, the chemical composition and speciation of these fluids, which is critical for the mobility of economically important elements, remain poorly c...

Among the deep-sea hydrothermal vent sites discovered in the past 30 years, Lost City on the Mid-Atlantic Ridge (MAR) is remarkable both for its alkaline fluids derived from mantle rock serpentinization and the spectacular seafloor carbonate chimneys precipitated from these fluids. Despite high concentrations of reduced chemicals in the fluids, this unique example of a serpentinite-hosted hydro...

A field campaign targeting high pH, H2-, and CH4-emitting serpentinite-associated springs in the Zambales and Palawan Ophiolites of the Philippines was conducted in 2012-2013, and enabled description of several springs sourced in altered pillow basalts, gabbros, and peridotites. We combine field observations of pH, temperature, conductivity, dissolved oxygen, and oxidation-reduction potential w...