Zircon O and Lu-Hf isotope evidence of mantle and supracrustal origins of Tasmanian Devonian granites

• Published in: Gondwana research 2022-10, Vol.110, p.1-12
• Main Authors: Jones, Colin L., Orovan, Evan A., Meffre, Sebastien, Thompson, Jay, Belousova, Elena A., Cracknell, Matthew J., Everard, John, Bottrill, Ralph, Bodorkos, Simon, Cooke, David R.
• Format: Article
• Language: English
• Subjects: Devonian; Granite; Hf-isotope; Melt evolution; Mineralization; O-isotope; Tasmania; Zircon
• ISSN: 1342-937X; 1878-0571
• DOI: 10.1016/j.gr.2022.06.004

[Display omitted] •Two distinct paths of infra- to upper-crustal εHfi– δ18O melt evolution identified.•Some highly-fractionated felsic granites have minimal crustal input to their melts.•Paths differentially associated with granite-related Au, Sn, and Sn–W ore deposits. The Tasmanian Devonian granites were emplaced during the Tabberabberan Orogeny when the East and West Tasmania Terranes were sutured. The primary aim of this study is to determine zircon O and Lu-Hf isotope constraints on, and relationships between, the magmas forming these granites. A second aim is to determine if these zircon isotopic compositions can be used to inform granite-related ore endowment. Several granites (n = 11 in East Tasmania Terrane, n = 1 West Tasmania Terrane) were previously dated by U-Pb geochronology using SHRIMP, and the zircon pits from the dating analyses were targeted firstly in O and later in Lu-Hf isotope analyses. The magmatic zircon δ18OVSMOW results ranged from mantle-like values (