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Thermal events documented in Hadean zircons by ion microprobe depth profiles

Trail, Dustin; Mojzsis, Stephen; Harrison, Timothy

Description

We report the first U-Th-Pb ion microprobe depth profiles of four Hadean zircons from the Jack Hills and Mount Narryer supracrustal belts of the Narryer Gneiss Complex (NGC), Western Australia. This ultra-high spatial resolution technique probes the age and origin of sub-micron features in individual crystals that can record episodes of zircon growth. Near-surface grain dates of 2700 Ma or older are coincident with post-depositional growth/modification. Some ages may coincide with documented...[Show more]

dc.contributor.authorTrail, Dustin
dc.contributor.authorMojzsis, Stephen
dc.contributor.authorHarrison, Timothy
dc.date.accessioned2015-12-10T22:20:43Z
dc.identifier.issn1872-9533
dc.identifier.urihttp://hdl.handle.net/1885/52055
dc.description.abstractWe report the first U-Th-Pb ion microprobe depth profiles of four Hadean zircons from the Jack Hills and Mount Narryer supracrustal belts of the Narryer Gneiss Complex (NGC), Western Australia. This ultra-high spatial resolution technique probes the age and origin of sub-micron features in individual crystals that can record episodes of zircon growth. Near-surface grain dates of 2700 Ma or older are coincident with post-depositional growth/modification. Some ages may coincide with documented pre-deposition metamorphic events for the NGC and igneous emplacement at ca. 3700 Ma. Separate events that do not correlate in time with known geologic episodes prior to the preserved rock record are also present on pre-4000 Ma zircons. We find evidence for a ∼3.9 Ga event, which is coterminous within age uncertainty with one or several large basin-forming impacts (e.g. Nectaris) on the Moon attributed to the late heavy bombardment of the inner solar system.
dc.publisherPergamon-Elsevier Ltd
dc.sourceGeochimica et Cosmochimica Acta
dc.subjectKeywords: crystal structure; grain size; ion microprobe; supracrustal rock; uranium series dating; zircon; Australasia; Australia; Western Australia
dc.titleThermal events documented in Hadean zircons by ion microprobe depth profiles
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume71
dc.date.issued2007
local.identifier.absfor040399 - Geology not elsewhere classified
local.identifier.ariespublicationU1408929xPUB238
local.type.statusPublished Version
local.contributor.affiliationTrail, Dustin, University of Colorado
local.contributor.affiliationMojzsis, Stephen, University of Colorado
local.contributor.affiliationHarrison, Timothy, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue16
local.bibliographicCitation.startpage4044
local.bibliographicCitation.lastpage65
local.identifier.doi10.1016/j.gca.2007.06.003
dc.date.updated2015-12-09T08:49:31Z
local.identifier.scopusID2-s2.0-34547483115
CollectionsANU Research Publications

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