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dc.contributor.authorCox, Morgan
dc.contributor.authorCavosie, Aaron
dc.contributor.authorBland, Phil
dc.contributor.authorMijkovic, Katarina
dc.contributor.authorWingate, M.
dc.date.accessioned2018-12-13T09:14:16Z
dc.date.available2018-12-13T09:14:16Z
dc.date.created2018-12-12T02:46:43Z
dc.date.issued2018
dc.identifier.citationCox, M. and Cavosie, A. and Bland, P. and Mijkovic, K. and Wingate, M. 2018. Microstructural dynamics of central uplifts: Reidite offset by zircon twins at the Woodleigh impact structure, Australia. Geology. 46: pp. 983-986.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/72738
dc.identifier.doi10.1130/G45127.1
dc.description.abstract

Impact cratering is a dynamic process that is violent and fast. Quantifying processes that accommodate deformation at different scales during central uplift formation in complex impact structures is therefore a challenging task. The ability to correlate mineral deformation at the microscale with macroscale processes provides a critical link in helping to constrain extreme crustal behavior during meteorite impact. Here we describe the first high-pressure-phase–calibrated chronology of shock progression in zircon from a central uplift. We report both shock twins and reidite, the high-pressure ZrSiO4 polymorph, in zircon from shocked granitic gneiss drilled from the center of the >60-km-diameter Woodleigh impact structure in Western Australia. The key observation is that in zircon grains that contain reidite, which forms at >30 GPa during the crater compression stage, the reidite domains are systematically offset by later-formed shock deformation twins (∼20 GPa) along extensional planar microstructures. The {112} twins are interpreted to record crustal extension and uplift caused by the rarefaction wave during crater excavation. These results provide the first physical evidence that relates the formation sequence of both a high-pressure phase and a diagnostic shock microstructure in zircon to different cratering stages with unique stress regimes that are predicted by theoretical and numerical models. These microstructural observations thus provide new insight into central uplift formation, one of the least-understood processes during complex impact crater formation, which can produce many kilometers of vertically uplifted bedrock in seconds.

dc.publisherGeological Society of America
dc.titleMicrostructural dynamics of central uplifts: Reidite offset by zircon twins at the Woodleigh impact structure, Australia
dc.typeJournal Article
dcterms.source.volume46
dcterms.source.startPage983
dcterms.source.endPage986
dcterms.source.issn0091-7613
dcterms.source.titleGeology
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available


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