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Magmatic water cont...
Magmatic water contents determined through clinopyroxene : Examples from the Western Canary Islands, Spain
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- Weis, Franz A. (author)
- Naturhistoriska riksmuseet,Uppsala universitet,Mineralogi, petrologi och tektonik,Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden,Enheten för geovetenskap
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- Skogby, Henrik (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Swedish Museum Nat Hist, Dept Geosci, Stockholm, Sweden.
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- Troll, Valentin (author)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Department of Physics (GEOVOL), University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain,CEMPEG,Uppsala University
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- Deegan, Frances (author)
- Stockholms universitet,Uppsala universitet,Mineralogi, petrologi och tektonik,Department of Geological Science, Stockholm University, Stockholm, Sweden,CEMPEG,Institutionen för geologiska vetenskaper,Uppsala University, Sweden
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- Dahrén, Börje, fil.dr, 1984- (author)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Uppsala University
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Geochemistry Geophysics Geosystems. - 1525-2027. ; 16:7, s. 2127-2146
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Abstract
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- Water is a key parameter in magma genesis, magma evolution, and resulting eruption styles, because it controls the density, the viscosity, as well as the melting and crystallization behavior of a melt. The parental water content of a magma is usually measured through melt inclusions in minerals such as olivine, a method which may be hampered, however, by the lack of melt inclusions suitable for analysis, or postentrapment changes in their water content. An alternative way to reconstruct the water content of a magma is to use nominally anhydrous minerals (NAMs), such as pyroxene, which take up low concentrations of hydrogen as a function of the magma's water content. During magma degassing and eruption, however, NAMs may dehydrate. We therefore tested a method to reconstruct the water contents of dehydrated clinopyroxene phenocrysts from the Western Canary islands (n=28) through rehydration experiments followed by infrared and Mossbauer spectroscopy. Employing currently available crystal/melt partitioning data, the results of the experiments were used to calculate parental water contents of 0.710.07 to 1.490.15 wt % H2O for Western Canary magmas during clinopyroxene crystallization at upper mantle conditions. This H2O range is in agreement with calculated water contents using plagioclase-liquid-hygrometry, and with previously published data for mafic lavas from the Canary Islands and comparable ocean island systems elsewhere. Utilizing NAMs in combination with hydrogen treatment can therefore serve as a proxy for pre-eruptive H2O contents, which we anticipate becoming a useful method applicable to mafic rocks where pyroxene is the main phenocryst phase.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Canary Islands
- NAMs
- clinopyroxene
- hydrogen
- magmatic water content
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
- The changing Earth
Publication and Content Type
- ref (subject category)
- art (subject category)
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