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dc.contributor.authorErickson, T.
dc.contributor.authorCavosie, Aaron
dc.contributor.authorPearce, M.
dc.contributor.authorTimms, N.
dc.contributor.authorReddy, S.
dc.date.accessioned2017-01-30T11:44:12Z
dc.date.available2017-01-30T11:44:12Z
dc.date.created2016-07-26T19:30:17Z
dc.date.issued2016
dc.identifier.citationErickson, T. and Cavosie, A. and Pearce, M. and Timms, N. and Reddy, S. 2016. Empirical constraints on shock features in monazite using shocked zircon inclusions. Geology. 44 (8): pp. 635-638.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/14505
dc.identifier.doi10.1130/G37979.1
dc.description.abstract

Shock deformation microstructures in monazite have been systematically characterized for the first time in grains from the Vredefort impact structure in South Africa. Electron backscatter diffraction mapping has identified 12 unique orientations of monazite deformation twins, including 7 orientations that have not previously been described in experiments or nature. Other shock features include planar deformation bands and strain-free neoblasts, which have been shown to date deformation. Shock-twinned zircon inclusions within the deformed monazite require pressures of 20 GPa, thus providing critical empirical constraints on formation conditions, confirming a hypervelocity impact origin of the monazite microstructures. The Vredefort monazite grains described here represent the first case of using shocked mineral inclusions to empirically calibrate shock microstructures formed in the host mineral. These results conclusively establish monazite as a recorder of shock deformation, and highlight its use in identifying and dating impact structures.

dc.publisherGeological Society of America
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE130100053
dc.titleEmpirical constraints on shock features in monazite using shocked zircon inclusions
dc.typeJournal Article
dcterms.source.volume44
dcterms.source.number8
dcterms.source.startPage635
dcterms.source.endPage638
dcterms.source.issn1943-2682
dcterms.source.titleGeology
curtin.departmentDepartment of Applied Geology
curtin.accessStatusFulltext not available


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