Significance of rare hydrous alkaline melts in Hawaiian xenoliths

Article Abstract:

Amphibole-bearing alkaline magma pockets in mantle xenoliths from Oahu are very primitive hydrous alkaline melts. The source of water for this hydrous melting is probably the plume. In plumes, the core is responsible for shield magmatism whereas the rim provides the water for post erosional volcanism. The melt pockets, such as amphibole-bearing (AMP) and spinel-bearing (SMP) glasses, are distinct in color and composition and are generally characterized by LREE-enriched patterns.

Natural history, Hawaii, Plumes (Fluid dynamics), Amphiboles

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A thermodynamic formulation of hydrous cordierite

Article Abstract:

A thermodynamic formulation of hydrous Mg-cordierite shows that cordierite is stabilized by 3 to 3.5 kbar under H2O-saturated conditions. Standard molar enthalpy and Gibbs free energy of hydration of H2O in cordierite are same as those of vaporization. The study is done using calorimetric and X-ray diffraction data for hydrous cordierite and hydrothermal syntheses results. The experimental methods and the results are discussed in detail.

Research, Usage, Observations, Zeolites, Thermodynamics, Thermodynamic potentials

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Pseudosinhalite: discovery of the hydrous MgAl-borate as a new mineral in the Tayozhnoye, Siberia, skarn deposit

Article Abstract:

A study was conducted to analyze the mineral pseudosinhalite. The mineral, which originated as a secondary phase based on sinhalite, supports an optical, chemical and structural similarity with the mineral sinhalit. The transparent mineral also integrates a white streak and a vitreous luster. It also has undulatory, polysynthetic twinning in the micron range. In addition, pseudosinhalite is monoclinic.

Minerals, Minerals (Geology)

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