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dc.contributor.authorallMasotta, M.; Dipartimento di Scienze della Terra, Sapienza—Universita` di Roma,en
dc.contributor.authorallFreda, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.authorallGaeta, M.; Dipartimento di Scienze della Terra, Sapienza—Universita` di Roma,en
dc.description.abstractCrystal-poor, differentiated magmas are com- monly erupted from shallow, thermally zoned magma chambers. In order to constrain the origin of these magmas, we have experimentally investigated crystallization, differentiation and crystal-melt separation in presence of a thermal gradient. Experiments have been designed taking advantage of the innate temperature gradient of the piston cylinder apparatus and carried out on a phonolitic system at 0.3 GPa and temperature ranging from 1,050 to 800 C. Crystallization degree and melt composition in experi- mental products vary as a function of the temperature gradient. In particular, melt composition differentiates from tephri-phonolite (starting material) to phonolite moving from the hotter, glassy zone (T B 1,050 C) towards the cooler, heterogeneously crystallized zone (T B 900 C) of the charge. The heterogeneously crystal- lized zone is made up of: (1) a crystal-rich, mushy region (crystallinity [30 vol%), (2) a rigid crystal framework (crystallinity B80 vol%) and (3) glassy belts of phonolitic glass at the top. Thermal gradient experiments picture crystallization, differentiation and crystal-melt separation processes occurring in a thermally zoned environment and reveal that relatively large volumes of crystal-poor melt (glassy belts) can originate as a consequence of the instability and collapse of the rigid crystal framework. Analogously, in thermally zoned magma chambers, the development and collapse of a solidification front may represent the controlling mechanism originating large volumes of crystal-poor, differentiated magmas.en
dc.description.sponsorshipSapienza Universita` di Roma,Istituto Nazionale di Geofisica e Vulcanologia.en
dc.publisher.nameSpringer Verlag Germanyen
dc.relation.ispartofContributions to Mineralogy and Petrologyen
dc.relation.ispartofseries/163 (2012)en
dc.subjectExplosive eruptionsen
dc.subjectCrystal-poor magmaen
dc.subjectThermal gradienten
dc.subjectSolidification fronten
dc.titleOrigin of crystal-poor, differentiated magmas: insights from thermal gradient experimentsen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrologyen
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dc.description.obiettivoSpecifico2.3. TTC - Laboratori di chimica e fisica delle rocceen
dc.description.journalTypeJCR Journalen
dc.contributor.authorMasotta, M.en
dc.contributor.authorFreda, C.en
dc.contributor.authorGaeta, M.en
dc.contributor.departmentDipartimento di Scienze della Terra, Sapienza—Universita` di Roma,en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.contributor.departmentDipartimento di Scienze della Terra, Sapienza—Universita` di Roma,en
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item.languageiso639-1en- di Scienze della Terra, Sapienza—Universita` di Roma,- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
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