Ascent-driven crystallisation of dacite magmas at Mount St Helens, 1980–1986

We introduce a novel scheme that enables natural silicic glasses to be projected into the synthetic system Qz-Ab-Or-H20 in order to relate variations in volcanic glass chemistry to changing pressure (P) and temperature (T) conditions in the sub-volcanic magma system. By this means an important disti...

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Veröffentlicht in:	Contributions to mineralogy and petrology 2001-03, Vol.140 (6), p.631-650
Hauptverfasser:	Blundy, Jon, Cashman, Kathy
Format:	Artikel
Sprache:	eng
Schlagworte:	Ascent Composition Cooling Crystallization Crystallography Crystals Decompression Depth Diagnostic systems Entrapment Equilibrium Feldspars Geology History Inclusions Lava Liquids Low pressure Magma Magma chambers Melts (crystal growth) Mineralogy Petrology Plagioclase Pressure Quartz Quartz crystals Saturation Silica Silica glass Silicon dioxide Storage conditions Temperature differences Temperature gradients Tridymite Volcanic activity Volcanic eruptions Volcanic glass Volcanoes Water
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Beschreibung
Zusammenfassung:	We introduce a novel scheme that enables natural silicic glasses to be projected into the synthetic system Qz-Ab-Or-H20 in order to relate variations in volcanic glass chemistry to changing pressure (P) and temperature (T) conditions in the sub-volcanic magma system. By this means an important distinction can be made between ascent-driven and cooling-driven crystallisation under water-saturated or undersaturated conditions.
ISSN:	0010-7999 1432-0967
DOI:	10.1007/s004100000219