Show simple item record

dc.contributor.authorGe, Rongfeng
dc.contributor.authorWilde, Simon
dc.contributor.authorNemchin, Alexander
dc.contributor.authorWhitehouse, M.
dc.contributor.authorBellucci, J.
dc.contributor.authorErickson, Timmons
dc.contributor.authorFrew, A.
dc.contributor.authorThern, E.
dc.date.accessioned2018-05-18T07:59:19Z
dc.date.available2018-05-18T07:59:19Z
dc.date.created2018-05-18T00:23:15Z
dc.date.issued2018
dc.identifier.citationGe, R. and Wilde, S. and Nemchin, A. and Whitehouse, M. and Bellucci, J. and Erickson, T. and Frew, A. et al. 2018. A 4463 Ma apparent zircon age from the Jack Hills (Western Australia) resulting from ancient Pb mobilization. Geology. 46 (4): pp. 303-306.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/67678
dc.identifier.doi10.1130/G39894.1
dc.description.abstract

Hadean (≥4.0 Ga) zircon grains provide the only direct record of the first half-billion years of Earth’s history. Determining accurate and precise crystallization ages of these ancient zircons is a prerequisite for any interpretation of crustal evolution, surface environment, and geodynamics on the early Earth, but this may be compromised by mobilization of radiogenic Pb due to subsequent thermal overprinting. Here we report a detrital zircon from the Jack Hills (Western Australia) with 4486–4425 Ma concordant ion microprobe ages that yield a concordia age of 4463 ± 17 Ma (2σ), the oldest zircon age recorded from Earth. However, scanning ion imaging reveals that this >4.4 Ga apparent age resulted from incorporation of micrometer-scale patches of unsupported radiogenic Pb with extremely high 207Pb/206Pb ratios and >4.5 Ga 207Pb/206Pb ages. Isotopic modeling demonstrates that these patches likely resulted from redistribution of radiogenic Pb in a ca. 4.3 Ga zircon during a ca. 3.8 Ga or older event. This highlights that even a concordia age can be spurious and should be carefully evaluated before being interpreted as the crystallization age of ancient zircon.

dc.publisherGeological Society of America
dc.titleA 4463 Ma apparent zircon age from the Jack Hills (Western Australia) resulting from ancient Pb mobilization
dc.typeJournal Article
dcterms.source.volume46
dcterms.source.number4
dcterms.source.startPage303
dcterms.source.endPage306
dcterms.source.issn0091-7613
dcterms.source.titleGeology
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record