Uncoupled O and Hf isotopic systems in zircon from the contrasting granite suites of the New England Orogen, eastern Australia: Implications for studies of Phanerozoic magma genesis

dc.contributor.authorJEON, Heejin
dc.contributor.authorWilliams, Ian
dc.contributor.authorBennett, Victoria
dc.date.accessioned2015-12-13T22:34:14Z
dc.date.issued2014
dc.date.updated2015-12-11T09:18:44Z
dc.description.abstractThe Permo-Triassic granites of the New England Orogen, eastern Australia, were emplaced into a volcanic arc complex accreted to the eastern Gondwana margin in the Late Devonian or Early Carboniferous. Zircon U-Pb dating shows that the S-type Hillgrove (~297Ma) and Bundarra (~287Ma) Supersuites predated intrusion of the I-type Moonbi Supersuite (~250Ma) by up to 50Ma. The high δ18Ozrn of the S-type granites (10.0-11.5‰), and range of U-Pb ages (~370-300Ma) and δ18Ozrn (~5-10‰) of their inherited zircon cores, show that their source rocks were predominantly weathered Carboniferous volcaniclastics, the youngest deposited<25Ma before the granites were emplaced. In contrast, the lower δ18Ozrn (6.9-7.8‰) and lack of inheritance in the I-type granites is consistent with a zircon poor, more juvenile source, probably a mafic igneous underplate mixed with a small amount of volcanogenic and/or oceanic sediment. Despite the differences in source materials, the εHf(t) values of all granites, both S- and I-type, are similar (+5.0±0.5 cf. +5.9±0.5), consistent with both the mafic and sedimentary components in the granite sources being relatively young and similar in Hf isotopic composition at the time of granite genesis. In young, isotopically juvenile orogens, the O isotopic composition of well-dated igneous and inherited zircon can be a much more sensitive indicator of petrogenetic processes than the zircon Hf isotopic compositions alone.
dc.identifier.issn0016-7037
dc.identifier.urihttp://hdl.handle.net/1885/76033
dc.publisherPergamon Press Ltd.
dc.sourceGeochimica et Cosmochimica Acta
dc.titleUncoupled O and Hf isotopic systems in zircon from the contrasting granite suites of the New England Orogen, eastern Australia: Implications for studies of Phanerozoic magma genesis
dc.typeJournal article
local.bibliographicCitation.lastpage149
local.bibliographicCitation.startpage132
local.contributor.affiliationJEON, Heejin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWilliams, Ian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBennett, Victoria, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailu8104453@anu.edu.au
local.contributor.authoruidJEON, Heejin, u4472561
local.contributor.authoruidWilliams, Ian, u8104453
local.contributor.authoruidBennett, Victoria, u8904005
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
local.identifier.ariespublicationU3488905xPUB4943
local.identifier.citationvolume146
local.identifier.doi10.1016/j.gca.2014.09.042
local.identifier.scopusID2-s2.0-84910067948
local.identifier.thomsonID000344946000009
local.identifier.uidSubmittedByU3488905
local.type.statusPublished Version

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