Detrital zircon U-Pb-Hf and O isotope character of the Cahill Formation and Nourlangie Schist, Pine Creek Orogen: Implications for the tectonic correlation and evolution of the North Australian Craton

dc.contributor.authorHollis, J A
dc.contributor.authorCarson, C.J.
dc.contributor.authorGlass, L M
dc.contributor.authorKositcin, N.
dc.contributor.authorSchersten, A
dc.contributor.authorWorden, K E
dc.contributor.authorArmstrong, Richard
dc.contributor.authorYaxley, Gregory
dc.contributor.authorKemp, A I S
dc.contributor.authorEIMF, E
dc.date.accessioned2015-12-10T23:34:18Z
dc.date.issued2014
dc.date.updated2015-12-10T11:32:13Z
dc.description.abstractDetrital zircon age and Hf isotope patterns for the Cahill Formation and Nourlangie Schist are distinctly different from other Paleoproterozoic successions in the North Australian Craton. The Cahill Formation and Nourlangie Schist comprise the bulk of the Paleoproterozoic strata in the Nimbuwah Domain, the easternmost part of the Pine Creek Orogen on the northern margin of the North Australian Craton. They comprise micaceous and quartzofeldspathic schist, carbonaceous schist, calc-silicate rock, amphibolite and quartzite, deformed and metamorphosed during emplacement of the granitic to dioritic Nimbuwah Complex at 1867-1857Ma. The Cahill Formation hosts several world-class uranium deposits including Ranger, Jabiluka and Nabarlek. U-Pb SHRIMP and LA-SF-ICPMS detrital zircon spectra for four samples of the Cahill Formation and six samples of the Nourlangie Schist show a similar broad spectrum of ages mainly in the range 3300-1900Ma. A ubiquitous dominant peak at 2530-2470Ma matches the age of underlying Neoarchean basement, but is distinct in its dominantly mantle-like Hf and O zircon isotopic character, which shows closer similarity with possible source rocks from the Gawler Craton or alternatively from the Dharwar Craton. Common smaller age peaks occur at 2180Ma, 2080Ma and 2020Ma. The first two have no known magmatic age correlatives in the North Australian Craton. Zircons of the 2020Ma peak have distinctively unradiogenic Hf and elevated δ18O, at variance with local rocks of this age but similar to detrital zircon of the same age from the Gawler Craton. In contrast to younger Proterozoic sedimentary successions within the Pine Creek Orogen, which contain ubiquitous ca. 1870Ma detritus, the detrital spectra for the Cahill Formation and Nourlangie Schist contain almost no ca. 1870Ma detritus. A maximum deposition age of ca. 1866Ma indicates deposition within error of intrusion of the Nimbuwah Complex. We propose that the Cahill Formation and Nourlangie Schist were deposited at a plate margin immediately prior to convergent tectonism. This resulted in their burial, deformation and amphibolite facies metamorphism during orogenesis associated with the Nimbuwah Event. These findings have implications for understanding the Paleoproterozoic evolution of the Pine Creek Orogen within the context of northern Australia.
dc.identifier.issn0301-9268
dc.identifier.urihttp://hdl.handle.net/1885/69383
dc.publisherElsevier
dc.sourcePrecambrian Research
dc.titleDetrital zircon U-Pb-Hf and O isotope character of the Cahill Formation and Nourlangie Schist, Pine Creek Orogen: Implications for the tectonic correlation and evolution of the North Australian Craton
dc.typeJournal article
local.bibliographicCitation.lastpage53
local.bibliographicCitation.startpage35
local.contributor.affiliationHollis, J A, Northern Territory Geological Survey
local.contributor.affiliationCarson, C.J., Geoscience Australia
local.contributor.affiliationGlass, L M, Northern Territory Geological Survey
local.contributor.affiliationKositcin, N., Geoscience Australia
local.contributor.affiliationSchersten, A, Lund University
local.contributor.affiliationWorden, K E, BBY Ltd
local.contributor.affiliationArmstrong, Richard, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationYaxley, Gregory, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKemp, A I S, The University of Western Australia
local.contributor.affiliationEIMF, E, University of Edinburgh
local.contributor.authoremailu4029979@anu.edu.au
local.contributor.authoruidArmstrong, Richard, u4029979
local.contributor.authoruidYaxley, Gregory, u4039347
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.absfor040299 - Geochemistry not elsewhere classified
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
local.identifier.ariespublicationU3488905xPUB2007
local.identifier.citationvolume246
local.identifier.doi10.1016/j.precamres.2014.02.013
local.identifier.scopusID2-s2.0-84896447480
local.identifier.thomsonID000336773100003
local.identifier.uidSubmittedByU3488905
local.type.statusPublished Version

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