Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8896
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dc.contributor.authorallGebauer, S. K.; Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USAen
dc.contributor.authorallSchmitt, A. K.; Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USAen
dc.contributor.authorallPappalardo, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.authorallStockli, D. F.; Department of Geological Sciences, University of Texas, Austin TX, USAen
dc.contributor.authorallLovera, O. M.; Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USAen
dc.date.accessioned2014-02-03T10:14:07Zen
dc.date.available2014-02-03T10:14:07Zen
dc.date.issued2014en
dc.identifier.urihttp://hdl.handle.net/2122/8896en
dc.description.abstractThe Campi Flegrei volcanic district (Naples region, Italy) is a 12-km-wide, restless caldera system that has erupted at least six voluminous ignimbrites during the late Pleistocene, including the [300 km3 Campanian ignimbrite (CI) which originated from the largest known volcanic event of the Mediterranean region. The Breccia Museo (BM), a petrologically heterogeneous and stratigraphically complex volcanic deposit extending over 200 km2 in close proximity to Campi Flegrei, has long remained contentious regarding its age and stratigraphic relation to the CI. Here, we present crystallization and eruption ages for BM plutonic ejecta clasts that were determined via uranium decay series and (U–Th)/He dating of zircon, respectively. Despite mineralogical and textural heterogeneity of these syenitic clasts, their U–Th zircon rim crystallization ages are indistinguishable with an average age of 49.7 ± 2.5 ka (2r errors; mean square of weighted deviates MSWD = 1.2; n = 34). A subset of these crystals was used to obtain disequilibrium-corrected (U–Th)/He zircon ages which average 41.7 ± 1.8 ka (probability of fit P = 0.54; n = 15). This age closely overlaps with published CI 40Ar/39Ar eruption ages (40.6 ± 0.1 ka) after recalibration to recently revised flux monitor ages. Concordant eruption ages for BM and CI agree with previous chemostratigraphic and paleomagnetic correlations, suggesting their origin from the same eruption. However, they are at variance with recalibrated 40Ar/39Ar ages which have BM postdate CI by 3 ± 1 ka. BM syenites show similar geochemical and Sr–Nd isotopical features of pre-caldera rocks erupted between 58 and 46 ka, but are distinctive from subsequent calderaforming magmas. Energy-constrained assimilation and fractional crystallization modeling of Nd–Sr isotopic data suggests that pre-caldera magmas formed a carapace of BM-type intrusions in a mid-crust magma chamber (C8 km depth) shielding the younger CI magma from contamination by Hercynian basement wall rocks. An *41–50 ka hiatus in crystallization ages implies rapid solidification of these pre-CI intrusions. This argues against protracted pre-eruptive storage of a large volume of CI magma at shallow crustal levels.en
dc.language.isoEnglishen
dc.publisher.nameSpringer Verlag Germanyen
dc.relation.ispartofContributions to Mineralogy and Petrologyen
dc.relation.ispartofseries/167 (2014)en
dc.subjectPleistoceneen
dc.subjectZirconen
dc.subjectGeochronologyen
dc.subjectTephraen
dc.titleCrystallization and eruption ages of Breccia Museo (Campi Flegrei caldera, Italy) plutonic clasts and their relation to the Campanian ignimbriteen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber953en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.02. Geochronologyen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrologyen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistryen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.03. Magmasen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocksen
dc.identifier.doi10.1007/s00410-013-0953-7en
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dc.description.obiettivoSpecifico1V. Storia e struttura dei sistemi vulcanicien
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.relation.issn0010-7999en
dc.relation.eissn1432-0967en
dc.contributor.authorGebauer, S. K.en
dc.contributor.authorSchmitt, A. K.en
dc.contributor.authorPappalardo, L.en
dc.contributor.authorStockli, D. F.en
dc.contributor.authorLovera, O. M.en
dc.contributor.departmentDepartment of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USAen
dc.contributor.departmentDepartment of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USAen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.departmentDepartment of Geological Sciences, University of Texas, Austin TX, USAen
dc.contributor.departmentDepartment of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USAen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptDepartment of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA-
crisitem.author.deptDepartment of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia-
crisitem.author.deptDepartment of Geological Sciences, University of Texas, Austin TX, USA-
crisitem.author.deptDepartment of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA-
crisitem.author.orcid0000-0002-9187-252X-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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