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Recycling of Proterozoic crust in Pleistocene juvenile magma and rapid formation of the Ok Tedi porphyry Cu-Au deposit, Papua New Guinea

van Dongen, M.; Weinberg, R; Tomkins, Andrew; Armstrong, Richard; Woodhead, Jonathan

Description

We present an investigation of the combined U-Pb, O and Hf isotope composition of zircons from a giant porphyry copper-gold deposit, hosted in a shoshonitic intermediate intrusive complex of the Ok Tedi area in Papua New Guinea. This area is part of a Late Miocene-Pliocene collisional fold-and-thrust belt related to island arc accretion to the Australian plate. Cathodoluminescence and transmitted light imaging reveal distinct zircon textures such as spongy rims and inherited zircon cores....[Show more]

dc.contributor.authorvan Dongen, M.
dc.contributor.authorWeinberg, R
dc.contributor.authorTomkins, Andrew
dc.contributor.authorArmstrong, Richard
dc.contributor.authorWoodhead, Jonathan
dc.date.accessioned2015-12-10T22:14:08Z
dc.identifier.issn0024-4937
dc.identifier.urihttp://hdl.handle.net/1885/50129
dc.description.abstractWe present an investigation of the combined U-Pb, O and Hf isotope composition of zircons from a giant porphyry copper-gold deposit, hosted in a shoshonitic intermediate intrusive complex of the Ok Tedi area in Papua New Guinea. This area is part of a Late Miocene-Pliocene collisional fold-and-thrust belt related to island arc accretion to the Australian plate. Cathodoluminescence and transmitted light imaging reveal distinct zircon textures such as spongy rims and inherited zircon cores. Spongy textures, interpreted to result from corrosion of the surface by hydrothermal fluids, do not seem to affect the U-Pb, O and Hf isotope composition. Calculated SHRIMP U-Pb ages for the rims are 1.1-1.4 Ma whereas the inherited component is ~ 1.8 Ga. Our age results combined with existing K-Ar results, constrain the formation of the Ok Tedi deposit to < 0.5 Myr. Oxygen isotope composition (δ18O), measured by SHRIMP, is ~ 6.5‰ for Pleistocene zircons but extend to values of ~ 8.3‰ or more for Proterozoic zircon cores. Likewise, corrected Hf isotope ratios from LA-ICP-MS analyses are centred on 0.2825 (εHf(t) = - 6.5 ± 2) for Pleistocene zircons, compared to ~ 0.2815 (εHf(t) = + 5 to - 3) for Proterozoic components. The Pleistocene zircon isotope signature is best explained by assimilation of Proterozoic crustal source material into asthenospheric mantle-derived magma similar to that of the Pliocene Porgera Au-only deposit in the same orogen.
dc.publisherElsevier
dc.sourceLithos
dc.subjectKeywords: Australian plate; cathodoluminescence; copper; fold and thrust belt; gold; hafnium; hydrothermal fluid; island arc; isotopic composition; isotopic ratio; oxygen isotope; Pleistocene; Pliocene; porphyry; Proterozoic; recycling; uranium-lead dating; zircon; e hafnium; Asthenospheric mantle; Magma mixing/mingling; Oxygen isotopes; Pliocene; U-Pb zircon dating
dc.titleRecycling of Proterozoic crust in Pleistocene juvenile magma and rapid formation of the Ok Tedi porphyry Cu-Au deposit, Papua New Guinea
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume114
dc.date.issued2010
local.identifier.absfor040307 - Ore Deposit Petrology
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationu4027924xPUB198
local.type.statusPublished Version
local.contributor.affiliationvan Dongen, M., Monash University
local.contributor.affiliationWeinberg, R, Monash University
local.contributor.affiliationTomkins, Andrew, Monash University
local.contributor.affiliationArmstrong, Richard, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWoodhead, Jonathan, University of Melbourne
local.description.embargo2037-12-31
local.bibliographicCitation.startpage282
local.bibliographicCitation.lastpage292
local.identifier.doi10.1016/j.lithos.2009.09.003
dc.date.updated2016-02-24T10:28:46Z
local.identifier.scopusID2-s2.0-73949114185
local.identifier.thomsonID000274902300002
CollectionsANU Research Publications

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