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Inherited and magmatic zircon from Neogene Hoyazo cordierite dacite, SE Spain - anatectic source rock provenance and magmatic evolution

Zeck, H; Williams, Ian

Description

Almandine-graphite-bearing biotite-cordierite dacite from Cerro del Hoyazo, southern Spain, represents erupted magma produced by Late Alpine anatexis of high-grade pelitic/quartzo-feldspathic paragneisses. U-Th-Pb ion microprobe analysis of inherited/detrital zircon cores from the dacite reveals five principal age groups, 2·8-2·5 Ga, 2·1-1·9 Ga, 1·1-0·9 Ga, 650-550 Ma and 350-320 Ma, indicating a Gondwana domain provenance. Some of the cores are surrounded by a thin euhedral overgrowth which...[Show more]

dc.contributor.authorZeck, H
dc.contributor.authorWilliams, Ian
dc.date.accessioned2015-12-13T23:24:42Z
dc.identifier.issn0022-3530
dc.identifier.urihttp://hdl.handle.net/1885/92343
dc.description.abstractAlmandine-graphite-bearing biotite-cordierite dacite from Cerro del Hoyazo, southern Spain, represents erupted magma produced by Late Alpine anatexis of high-grade pelitic/quartzo-feldspathic paragneisses. U-Th-Pb ion microprobe analysis of inherited/detrital zircon cores from the dacite reveals five principal age groups, 2·8-2·5 Ga, 2·1-1·9 Ga, 1·1-0·9 Ga, 650-550 Ma and 350-320 Ma, indicating a Gondwana domain provenance. Some of the cores are surrounded by a thin euhedral overgrowth which has the same age as a suite of sharply euhedral new-grown zircons in the dacite, 6·33 ± 0·15 (tσ) Ma. This zircon precipitated from the melt during or just before eruption of the magma. A foliated graphite-bearing cordierite-plagioclase-almandine-sillimanite- biolite restite rock inclusion contains inherited zircon cores similar in age to those in the dacite, consistent with the syngenetic melt-restite relationship between the magmatic melt and its Al-rich rock inclusions. Over growths on the enclave zircon cores have an age of 8·34 ± 0·45(tσ) Ma, which probably records an early stage of the ultra- metamorphism leading to the generation of the anatectic magma body. The inheritance age patterns of both dacite and restitic enclave, and zircon ages from the basement below the Cerro del Hoyazo, suggest that the anatectic source complex was probably a high-grade amphibolite facies equivalent of either the Palaeozoic schist complex of the basal nappe section or, more likely, its Permo-Triassic cover section.
dc.publisherOxford University Press
dc.sourceJournal of Petrology
dc.subjectKeywords: amphibolite facies; anatexis; dacite; petrogenesis; S-type rock; zircon; Spain Alpine Betic-Rif belt; Crustal anatexis; Post-collisional magmatism; Zircon inheritance
dc.titleInherited and magmatic zircon from Neogene Hoyazo cordierite dacite, SE Spain - anatectic source rock provenance and magmatic evolution
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume43
dc.date.issued2002
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040306 - Mineralogy and Crystallography
local.identifier.ariespublicationMigratedxPub23409
local.type.statusPublished Version
local.contributor.affiliationZeck, H, University of Western Australia
local.contributor.affiliationWilliams, Ian, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage1089
local.bibliographicCitation.lastpage1104
dc.date.updated2015-12-12T09:21:35Z
local.identifier.scopusID2-s2.0-0036081894
CollectionsANU Research Publications

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