http://www.cnr.it/ontology/cnr/individuo/prodotto/ID182823
Evidences for disruption of a crystallizing front in a magma chamber during caldera collapse: an example from the Breccia Museo unit (Campanian Ignimbrite eruption, Italy) (Articolo in rivista)
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- Evidences for disruption of a crystallizing front in a magma chamber during caldera collapse: an example from the Breccia Museo unit (Campanian Ignimbrite eruption, Italy) (Articolo in rivista) (literal)
- Anno
- 2004-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/S0377-0273(03)00395-0 (literal)
- Alternative label
Fulignati P; Marianelli P; Proto M; Sbrana A (2004)
Evidences for disruption of a crystallizing front in a magma chamber during caldera collapse: an example from the Breccia Museo unit (Campanian Ignimbrite eruption, Italy)
in Journal of volcanology and geothermal research; Elsevier Science Publishers, Amsterdam (Paesi Bassi)
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- Fulignati P; Marianelli P; Proto M; Sbrana A (literal)
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- Dipartimento di Scienze della Terra, Universita' di Pisa, Via S. Maria 53, 56126 Pisa, Italy (literal)
- Titolo
- Evidences for disruption of a crystallizing front in a magma chamber during caldera collapse: an example from the Breccia Museo unit (Campanian Ignimbrite eruption, Italy) (literal)
- Abstract
- This work is focused on juvenile components and some cognate xenoliths of the Breccia Museo (BM) unit. The
BM is a coarse-grained proximal unit of the caldera-forming phase of the Ignimbrite Campana (IC) eruption,
southern Italy. The BM products show some peculiar characteristics that distinguish them from the other IC deposits.
In particular, different types of pumice fragments constitute the juvenile fraction and their crystal contents are
remarkably higher than the other IC units. Slightly porphyritic and highly porphyritic trachytic to phonolitic pumices
were distinguished in each sample and investigated separately for mineralogy, matrix glass composition, melt and fluid
inclusion studies. Most feldspar crystals may have formed at the margins of the magma chamber and the crystal
content of both types of pumice fragments can be ascribed to variable entrainment of these crystals (from the
solidification front) by the melt. Variably porphyritic (65 to 30 vol% phenocrysts) pumice and completely
crystallized nodules may represent samples of progressively crystallized magma at the chamber walls. Crystallization
temperatures of magmas and xenoliths were estimated using two independent methods: a two-feldspar
geothermometer and the homogenization temperatures of melt and fluid inclusions in clinopyroxene and K-feldspar.
The decrease in the estimated crystallization temperatures from the melt (980^850?C) to the nodules (840^820?C) is
consistent with a model of decreasing temperature at a magma chamber solidification front. The study of xenoliths
revealed that exsolution of a hypersaline aqueous fluid phase occurred at the peripheral parts of the magma chamber.
< 2003 Elsevier B.V. All rights reserved. (literal)
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