ITEM VIEW

S-type ignimbrites with polybaric crystallisation histories: the Tolmie Igneous Complex, Central Victoria, Australia

dc.contributor.authorClemens J.D.
dc.contributor.authorBirch W.D.
dc.contributor.authorDudley R.A.
dc.date.accessioned2011-10-13T16:59:29Z
dc.date.available2011-10-13T16:59:29Z
dc.date.issued2011
dc.identifier.citationContributions to Mineralogy and Petrology
dc.identifier.citationhttp://www.scopus.com/inward/record.url?eid=2-s2.0-79957455430&partnerID=40&md5=3aebd3aa7ccaa6be3a79474247dcc287
dc.identifier.issn107999
dc.identifier.other10.1007/s00410-011-0652-1
dc.identifier.urihttp://hdl.handle.net/10019.1/17125
dc.description.abstractThe Late Devonian Tolmie Igneous Complex (in north-eastern Victoria, Australia) contains S-type, intracaldera, rhyolitic ignimbrites with multiple generations of phenocrysts of biotite, garnet, cordierite and orthopyroxene; one unit also contains fayalitic olivine. Geothermometry and calculated phase relations indicate high-T deep- to mid-crustal origins for the magmas, with crystallisation at several levels. At least four separate magma groups make up the complex. Compositional variations within and between ignimbrites are adequately modelled by selective entrainment of peritectic garnet, ilmenite, orthopyroxene and plagioclase into the magmas. Neither crystal fractionation nor mafic-felsic magma mixing played a role. Chemical and isotope data suggest that the magma sources were once variably Ba-enriched arc greywackes with different proportions of clay. The deep origin of some of the Tolmie Complex magmas means that supracrustal rocks underlie parts of north-eastern Victoria at depths of around 35 km. This has important implications for understanding the region's tectonic development. © 2011 Springer-Verlag.
dc.titleS-type ignimbrites with polybaric crystallisation histories: the Tolmie Igneous Complex, Central Victoria, Australia
dc.typeArticle in Press
dc.description.versionArticle in Press


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

ITEM VIEW