The replacement of anthophyllite by jimthompsonite: a model for hydration reaction in biopyriboles
Article Abstract:
High resolution transmission electron microscopy (HRTEM) was utilized to characterize the chain width distributions of disordered polysomes in anthophyllite crystals from the Leopontine Alps in Switzerland. The submicroscopic intergrowths of biopyribole polysomes of the anthophyllite crystals were characterized by HRTEM as intermediated products that were formed during the transformation of the crystals to silicate jimthompsonite. Furthermore, the composition of the ordered and disordered biopyribole products was more similar to talc than to jimthompsonite.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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Solubility of water and carbon dioxide in an icelandite at 1400 degrees C and 10 kilobars
Article Abstract:
Fourier transform infrared (FTI) spectroscopy was utilized to measure the levels of water and carbon that were dissolved in an icelandite glass. FTI and elemental analysis of the icelandite that was quenched from 1400 degrees centigrade and 10 kilobars indicated the presence of 0.36 to 0.95 mole fractions of carbon dioxide which remained constant under different CO2 frugalities. Furthermore, the icelandite glass exhibited reduced amounts of molecular water which was negatively correlated with the carbonate peak.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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Petrology and geochemistry of peridotite xenoliths from the Letlhakane kimberlites, Botswana
Article Abstract:
Geochemistry of diamondiferous Letlhakane kimberlites from the Proterozoic Magondi Belt of Botswana was analyzed to determine its geological and petrological significance. The diamondiferous peridotite xenoliths from the Letlhakane kimberlites of Bostwana were composed of peridotites, pyroxenites, eclogites, megacrysts and glimmerites. Furthermore, the petrography and mineral chemistry of the peridotite xenoliths was similar to that of diamondiferous minerals of the Kaapvaal craton.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
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