Ignimbrites of basaltic andesite and andesite compositions from Tanna, New Hebrides Arc
نویسندگان
چکیده
منابع مشابه
Basaltic andesite, altered basalt, and a TES-based search for smectite clay minerals on Mars
[1] The global-scale surface type 2 unit first identified with the Mars Global Surveyor Thermal Emission Spectrometer (TES) remains enigmatic. Competing hypotheses suggest that it represents either basaltic andesite or some form of altered basalt rich in dioctahedral smectite clay minerals and/or spectrally similar amorphous silica phases. Common dioctahedral smectites contain a diagnostic feat...
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Microcrystalline inclusions within microlite-poor matrix are surprisingly common in low intensity eruptions around the world, yet their origin is poorly understood. Inclusions are commonly interpreted as evidence of crystallization along conduit margins. Alternatively, these clasts may be recycled from low level eruptions where they recrystallize by heating within the vent. We conducted a serie...
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Viscosity has been determined during isothermal crystallization of an andesite from Tungurahua volcano (Ecuador). Viscosity was continuously recorded using the concentric cylinder method and employing a Pt-sheathed alumina spindle at 1 bar and from 1400°C to subliquidus temperatures to track rheological changes during crystallization. The disposable spindle was not extracted from the sample but...
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Introduction: Data from the MGS Thermal Emission Spectrometer (TES) has shown that surface type 1 (ST1) materials, interpreted as basalt, dominate the ancient crust in the southern highlands of Mars [1]. Large expanses of surface type 2 (ST2) materials in the northern lowlands have been variously interpreted as andesite [1, 2], oxidized crystalline basalt [3], or partly weathered basalt [4]. Th...
متن کاملPulsatory andesite lava flow at Bagana Volcano
[1] Using a time series of TerraSAR-X spaceborne radar images we have measured the pulsatory motion of an andesite lava flow over a 14-month period at Bagana Volcano, Papua New Guinea. Between October 2010 and December 2011, lava flowed continuously down the western flank of the volcano forming a 3 km-long blocky lava flow with a channel, levees, overflows and branches. We captured four success...
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ژورنال
عنوان ژورنال: Bulletin of Volcanology
سال: 1994
ISSN: 0258-8900,1432-0819
DOI: 10.1007/s004450050013