Phase equilibria of phlogopite lamprophyres from western Mexico: biotite-liquid equilibria and P-T estimates for biotite-bearing igneous rocks
Article Abstract:
Bulk composition affects the phase equilibria stability of phlogopite lamprophyres from western Mexico. The augite minettes in the igneous rocks have high values of CaO/MgO, while the olivine minettes have lower ratios. TiO(sub 2) partitioning between phlogopite and liquid is a function of temperature, but not pressure. The BaO partitioning depends on both temperature and pressure. An analysis of ferric-ferrous iron partitioning, biotite stability, different thermodynamic conditions, and the origin of the minettes is given.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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The hydrous phase equilibria (to 3 kbar) of an andesite and basaltic andesite from western Mexico: constraints on water content and conditions of phenocryst growth
Article Abstract:
The equilibraton conditions of the phenocryst assemblages were examined by performing high pressure, up to 3 kbars, water saturated experiments on an andesite and a basaltic andesite from western Mexico. The residual liquid compositions were measured using a rapid quench technique. Results showed that the Colima andesite lavas were stored at a temperature between 950 to 975 degrees Centigrade at a pressure between 750 to 1,500 bars and the residual liquid contains water of 3.5 to 4.5 wt%.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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The effect of dissolved water on the oxidation state of iron in natural silicate liquids
Article Abstract:
A comparison of the hydrous ferric-ferrous values with the estimated values shows that the dissolution of water in an andesite, peralkaline and rhyolite and augite minette does not affect the redox state of iron in these melts. The study analyzed the anhydrous nature of the redox state of iron in silicate liquids as a function of temperature, composition and oxygen fugacity.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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