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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