Quantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa

Simple item page
dc.contributor.authorLana C.
dc.contributor.authorTohver E.
dc.contributor.authorCawood P.
dc.date.accessioned2011-05-15T16:03:50Z
dc.date.available2011-05-15T16:03:50Z
dc.date.issued2010
dc.description.abstractThe Barberton granitoid-greenstone belt is a classic dome-and-keel province, characterized by kilometer-scale gneiss domes and elongate keels of largely folded supracrustal rocks. Combined U-Pb SHRIMP data and structural mapping demonstrate that the geometry of the Barberton belt reflects events that occurred over ∼30 million year interval, from ca. 3230 and 3203 Ma. Early deformation with NW-SE shortening in the upper crust was accompanied by emplacement of tonalite-trondhjemite-granodiorite TTG magmas at 3234 ± 12 and 3226 ± 9 Ma. Much of the structural grain of the greenstone belt relates to a long episode of post-orogenic extension, with NE-directed extension in the lower crust leading to exhumation of high-grade gneisses in the southern Barberton terrane. Advective heat transfer during emplacement of kilometer-scale (TTG) plutons around the margins of the greenstone belt facilitated the infolding of the relatively denser and colder greenstone sequence. The end of this tectonic cycle is punctuated by the emplacement of the undeformed, 3203 ± 7 Ma Dalmein pluton, which sharply truncates not only anticlines and synclines in the greenstone belt but also the dominant fabric in the high-grade gneisses. © 2009 Elsevier B.V. All rights reserved.
dc.description.versionArticle
dc.identifier.citationPrecambrian Research
dc.identifier.citation177
dc.identifier.citation02-Jan
dc.identifier.issn3019268
dc.identifier.other10.1016/j.precamres.2009.12.001
dc.identifier.urihttp://hdl.handle.net/10019.1/12804
dc.subjectArchean
dc.subjectdeformation
dc.subjectdome
dc.subjectemplacement
dc.subjectexhumation
dc.subjectgeometry
dc.subjectgranitoid
dc.subjectgreenstone belt
dc.subjectheat transfer
dc.subjectlower crust
dc.subjectpluton
dc.subjectSHRIMP dating
dc.subjectsupracrustal rock
dc.subjectupper crust
dc.subjecturanium-lead dating
dc.subjectBarberton
dc.subjectMpumalanga
dc.subjectSouth Africa
dc.titleQuantifying rates of dome-and-keel formation in the Barberton granitoid-greenstone belt, South Africa
dc.typeArticle
Files
Collections
Stellenbosch University - Scopus Publications