Relationships between chamber margin accumulates and pore liquids: evidence from arrested in situ processes in ejecta, Latera caldera, Italy

Article Abstract:

Biotite clinopyroxenite and leucite monzosyenite formations characterize the plutonic ejecta in Latera caldera, Italy. The xenoliths are formed from the open-system differentiation and intermittent replenishment of the crustal magma system leading to the crystallization of the magma chamber margin accumulates. The liquid convective fractionation through permeable crystal mush is responsible for localized disequilibrium in cumulate and pore fluid systems. In addition, the Latera tuff features orthocumulate, granular and porphyritic textural end members.

Italy, Natural history, Volcanic ash, tuff, etc., Volcanic rocks, Calderas, Amphiboles, Intrusions (Geology)

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Interactions and mixing properties in the (C2/c) clinopyroxene quadrilateral

Article Abstract:

Research describing C2/c pyroxene quadrilaterals is presented. Gibbs' free energy applications provide excess surfaces which were set at different pressure and temperature conditions. The C2/c compositional space Mg2Si2O6-CaMgSi2O6-CaFeSi2O6-FeSi2O6 described the Gibbs surfaces, which were attached to four component extensions of two macroscopic models. The Wohl model is chosen for its relative simplicity.

Usage, Gibbs' free energy

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Enstatite-jadeite join and its role in the earth's mantle

Article Abstract:

A model describing enstatite-jadeite join is developed and analyzed. The model focuses on the development of a complete phase diagram for the join in at temperatures ranging from 500-2500 degrees celsius and 0-270 kb. Results show that the presence of the two variables in the earth's mantle at depths of 400 and 670 km relates to garnet formation and breakdown of garnet with a pyroxene base.

Earth, Mantle (Geology), Jadeite (Petrology), Jadeite

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