Volatiles in pantellerite magmas: A case study of the Green Tuff Plinian eruption (Island of Pantelleria, Italy)
Journal of Volcanology and Geothermal Research, ISSN: 0377-0273, Vol: 262, Page: 153-163
2013
- 31Citations
- 35Captures
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Article Description
The Green Tuff (GT) Plinian eruption, the largest in magnitude at Pantelleria, erupted 3 to 7 km 3 DRE of pantellerite magma and a small volume of trachyte. Fifty-nine anorthoclase-hosted melt inclusions from the two basal pumice members were analyzed by FT-IR spectroscopy in order to assess the pre-eruptive H 2 O content in the pantellerite melt. Microanalytical methods were used to determine major element, Cl, F and S contents. Melt inclusions and glassy groundmasses have a nearly homogeneous pantelleritic composition (peralkaline index = 1.9-2.2) and variable water contents ranging from 1.4 to as high as 4.2 wt %, i.e. much higher than the 1.4 wt % of earlier published studies. The chlorine content is constant at about 1 wt %. Combined Cl and H 2 O data were used to estimate a confining pressure of about 50 MPa (depth around 2-3 km) for the GT magma chamber. The chamber was characterized by a compositional zoning with a dominant pantellerite overlying a trachyte magma. Soon after the GT eruption, intra-caldera volcanism was dominated by the eruption of voluminous trachyte lava flows, while pantellerite melt production resumed after about 20 ka with numerous low-volume, mildly explosive (Strombolian) to effusive eruptions. Comparison with data from the literature reveals that, despite the different explosivity, the post-caldera Strombolian eruptions and the GT Plinian eruption were fed by pantelleritic magmas with similar water contents. Chlorine and CO 2 contents suggest that the young magma reservoirs feeding the Strombolian to effusive activity were deeper (h ≥ 4.5 km) than the much larger (based on erupted volumes) magma chamber which fed the GT eruption.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0377027313002254; http://dx.doi.org/10.1016/j.jvolgeores.2013.06.011; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84883439391&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0377027313002254; https://api.elsevier.com/content/article/PII:S0377027313002254?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S0377027313002254?httpAccept=text/plain; https://dx.doi.org/10.1016/j.jvolgeores.2013.06.011
Elsevier BV
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