Show simple item record

dc.contributor.authorGrange, Marion
dc.contributor.authorPidgeon, Robert
dc.contributor.authorNemchin, Alexander
dc.contributor.authorTimms, Nicholas Eric
dc.contributor.authorMeyer, C.
dc.date.accessioned2017-01-30T15:30:34Z
dc.date.available2017-01-30T15:30:34Z
dc.date.created2013-02-27T20:00:40Z
dc.date.issued2013
dc.identifier.citationGrange, M.L. and Pidgeon, R.T. and Nemchin, A.A. and Timms, N.E. and Meyer, C. 2013. Interpreting U–Pb data from primary and secondary features in lunar zircon. Geochimica et Cosmochimica Acta. 101: pp. 112-132.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/47006
dc.identifier.doi10.1016/j.gca.2012.10.013
dc.description.abstract

In this paper, we describe primary and secondary microstructures and textural characteristics found in lunar zircon and discuss the relationships between these features and the zircon U–Pb isotopic systems and the significance of these features for understanding lunar processes. Lunar zircons can be classified according to: (i) textural relationships between zircon and surrounding minerals in the host breccias, (ii) the internal microstructures of the zircon grains as identified by optical microscopy, cathodoluminescence (CL) imaging and electron backscattered diffraction (EBSD) mapping and (iii) results of in situ ion microprobe analyses of the Th–U–Pb isotopic systems. Primary zircon can occur as part of a cogenetic mineral assemblage (lithic clast) or as an individual mineral clast and is unzoned, or has sector and/or oscillatory zoning. The age of primary zircon is obtained when multiple ion microprobe analyses across the polished surface of the grain give reproducible and essentially concordant data. A secondary set of microstructures, superimposed on primary zircon, include localised recrystallised domains, localised amorphous domains, crystal–plastic deformation, planar deformation features and fractures, and are associated with impact processes. The first two secondary microstructures often yield internally consistent and close to concordant U–Pb ages that we interpret as dating impact events. Others secondary microstructures such as planar deformation features, crystal–plastic deformation and micro-fractures can provide channels for Pb diffusion and result in partial resetting of the U–Pb isotopic systems.

dc.publisherPergamon-Elsevier Science Ltd
dc.subjectSHRIMP
dc.subjectmoon
dc.subjectresetting
dc.subjectmagmatic
dc.subjectU-Pb dating
dc.subjectEBSD
dc.subjectzircon
dc.subjectimpact
dc.subjectCL
dc.titleInterpreting U–Pb data from primary and secondary features in lunar zircon
dc.typeJournal Article
dcterms.source.volume101
dcterms.source.startPage112
dcterms.source.endPage132
dcterms.source.issn00167037
dcterms.source.titleGeochimica Et Cosmochimica Acta
curtin.department
curtin.accessStatusOpen access


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record