The petrology, geochronology and tectono-magmatic setting of igneous rocks in the Suckling-Dayman metamorphic core complex, Papua New Guinea

dc.check.date2022-03-03
dc.check.infoAccess to this article is restricted until 24 months after publication by request of the publisher.en
dc.contributor.authorӦsterle, J. E.
dc.contributor.authorLittle, T. A.
dc.contributor.authorSeward, D.
dc.contributor.authorStockli, D. F.
dc.contributor.authorGamble, John A.
dc.contributor.funderMarsden Funden
dc.date.accessioned2020-03-05T12:33:03Z
dc.date.available2020-03-05T12:33:03Z
dc.date.issued2020-03-03
dc.date.updated2020-03-05T12:15:35Z
dc.description.abstractSoutheastern Papua New Guinea has hosted magmatism throughout the Cenozoic, with the latest phase being concurrent with active extension in the Woodlark Rift. There, the Suckling-Dayman metamorphic core complex (SDMCC) has exhumed middle-crustal rocks in the past few million years along a still-active low-angle normal fault, the Mai'iu Fault. Uplift of the SDMCC has exposed metasedimentary and metaigneous rocks of Late Cretaceous-Pleistocene age that record an evolution from oceanic spreading to subduction, to collision, and finally to subduction-inversion and extensional exhumation. We present new petrographic, whole-rock geochemical and geochronologic (outcrop and detrital zircon UPb) data from the SDMCC to reconstruct its long-term evolution. The dominant footwall-lithology of the SDMCC, the Goropu Metabasalt, has a MORB composition. Detrital zircons from metasedimentary beds intercalated with these basalts yield U–Pb-based maximum estimates for deposition of ~103 and ~72 Ma, suggesting a Late Cretaceous spreading age of the oceanic protolith. Bulk compositions of low-grade tholeiitic meta-gabbroic and -tonalitic rocks (Yau Igneous Complex) that intrude the Goropu Metabasalt reveal both enriched and depleted light rare earth element patterns. Zircon UPb ages from the Yau Igneous Complex range between ~60 and ~57 Ma, providing a minimum age for the formation of the Goropu Metabasalt. Much younger syn-extensional granitoids in the mafic footwall of the SDMCC have calc-alkaline to high-K compositions and UPb ages on zircon between ~3.7 and ~2.0 Ma. Our data indicate that the Mai'iu Fault had re-activated a Paleogene thrust as an extensional detachment fault by 3.7 ± 0.2 Ma. UPb ages of detrital zircons in modern streams draining the footwall of the SDMCC are essentially restricted to the ages revealed by the Paleocene and Plio-Pleistocene intrusions. Xenocrystic zircons in the Plio-Pleistocene granitoids imply that the crust underlying the metabasaltic carapace of the SDMCC consists chiefly of Australian-continent derived sedimentary rocks.en
dc.description.sponsorshipMarsden Fund (Marsden Grant VUW1310 and NSF Grant EAR-1524729)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationӦsterle, J. E., Little, T. A., Seward, D., Stockli, D. F. and Gamble, J. (2020) 'The petrology, geochronology and tectono-magmatic setting of igneous rocks in the Suckling-Dayman metamorphic core complex, Papua New Guinea', Gondwana Research, doi: 10.1016/j.gr.2020.01.014en
dc.identifier.doi10.1016/j.gr.2020.01.014en
dc.identifier.endpage86en
dc.identifier.issn1342-937X
dc.identifier.journaltitleGondwana Researchen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/9725
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S1342937X20300666
dc.rights© 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 licence.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectZirconen
dc.subjectSouthwest Pacificen
dc.subjectGondwanaen
dc.subjectU–Pb depth-profile datingen
dc.subjectSuckling-Dayman metamorphic core complexen
dc.titleThe petrology, geochronology and tectono-magmatic setting of igneous rocks in the Suckling-Dayman metamorphic core complex, Papua New Guineaen
dc.typeArticle (peer-reviewed)en
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