HOST ROCK COMPOSITIONAL CONTROLS ON ZIRCON TRACE ELEMENT SIGNATURES IN METABASITES FROM THE AUSTROALPINE BASEMENT

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dc.contributor.author Schulz B.
dc.contributor.author Klemd R.
dc.contributor.author Br?tz H.
dc.date.accessioned 2024-05-11T04:44:59Z
dc.date.available 2024-05-11T04:44:59Z
dc.date.issued 2006
dc.identifier https://elibrary.ru/item.asp?id=12091946
dc.identifier.citation Geochimica et Cosmochimica Acta, 2006, 70, 3, 697-710
dc.identifier.issn 0016-7037
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/43880
dc.description.abstract Zircon populations of Neoproterozoic and early Paleozoic age occur in metabasites of a high-pressure amphibolite-facies unit of the Austroalpine basement south of the Tauern Window. The host rocks for these zircons are eclogitic amphibolites of N-MORB-type character, hornblende gneisses with volcanic-arc basalt signature, and alkaline within-plate-basalt amphibolites. Bulk rock magmatic trace element patterns were preserved during amphibolite-facies high-pressure and subsequent high-temperature events, as well as a greenschist-facies overprint. Positive Ce and negative Eu anomalies and enrichment of HREE in normalized zircon REE patterns, as analysed by LA-ICP-MS, are typical for an igneous origin of these zircon suites. Zircon Y is well correlated to HREE, Ce, Th, U, Nb, and Ta and allows discrimination of compositional fields for each host rock type. Low Th/U ratios are correlated to low Y and HREE abundances in zircon from low bulk Th/U host rocks. This is likely a primary igneous characteristic that cannot be attributed to metamorphic recrystallization. Variations of zircon/ host rock element ratios confirm that ionic radii and charges control abundances of many trace elements in zircon. The trace element ratios - presented as mineral/melt distribution coefficients - indicate a selectively inhibited substitution of Zr and Si by HREE and Y in zircon which crystallized from a N-MORB melt. Correlated host rock and zircon trace element concentrations indicate that the metabasite zircons are not xenocrysts but crystallized from mafic melts, represented by the actual host rocks. ? 2005 Elsevier Inc. All rights reserved.
dc.subject MAGMA CHEMISTRY
dc.subject METABASITE
dc.subject PROTEROZOIC
dc.subject ZIRCON
dc.subject ALPS
dc.subject EASTERN ALPS
dc.subject EURASIA
dc.subject EUROPE
dc.subject TAUERN WINDOW
dc.title HOST ROCK COMPOSITIONAL CONTROLS ON ZIRCON TRACE ELEMENT SIGNATURES IN METABASITES FROM THE AUSTROALPINE BASEMENT
dc.type Статья
dc.identifier.doi 10.1016/j.gca.2005.10.001
dc.subject.age Precambrian::Proterozoic


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