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The geochronology of the Limpopo Complex; a controversy solved

Jan D. Kramers and Hassina Mouri
The geochronology of the Limpopo Complex; a controversy solved (in Origin and evolution of Precambrian high-grade gneiss terranes, with special emphasis on the Limpopo Complex of Southern Africa, Dirk D. van Reenen (editor), Jan D. Kramers (editor), Stephen McCourt (editor) and Leonid L. Perchuk (editor))
Memoir - Geological Society of America (2011) 207: 85-106

Abstract

The results of 50 years of geochronological work in the Limpopo Complex are reviewed. The data define three main age clusters. The oldest, at ca. 3.3 Ga, exists in the Central and Southern Marginal Zones and is defined by magmatic zircon dates. The second, with a genuine spread between 2.7 and 2.55 Ga, occurs in all three zones. It was a period of high-grade regional metamorphism with intense deformation and widespread anatexis, dated also mainly (but not exclusively) by zircon U-Pb. The third cluster is well constrained at 2.02 + or - 0.02 Ga in the Central Zone by zircon overgrowths, sparse magmatic zircons, monazite, apatite, Sm-Nd and Lu-Hf garnet dating, Pb/Pb discrete phase and stepwise leaching dating of garnet and titanite, and hornblende Ar/Ar dating. The Paleoproterozoic dates from metamorphic minerals are particularly associated with zones of intense transcurrent shearing at high-grade metamorphism. In the Northern Marginal Zone this event is more protracted, from 2.08 to 1.94 Ga, and defined in medium- to low-grade shear zones. In the Southern Marginal Zone it is absent. The evidence for both Neoarchean and Paleoproterozoic mineral ages, both defining high-grade tectono-metamorphic events, is in part paradoxical and has led to controversies as to the age of a proposed collisional orogeny. Studying the mineral dates in their tectonic context leads to the conclusion that fluid access in deformation, rather than mere reheating, mainly caused their partial resetting in the Paleoproterozoic event. This allows the controversy to be resolved.


ISSN: 0072-1069
Coden: GSAMAQ
Serial Title: Memoir - Geological Society of America
Serial Volume: 207
Title: The geochronology of the Limpopo Complex; a controversy solved
Title: Origin and evolution of Precambrian high-grade gneiss terranes, with special emphasis on the Limpopo Complex of Southern Africa
Author(s): Kramers, Jan D.Mouri, Hassina
Author(s): van Reenen, Dirk D.editor
Author(s): Kramers, Jan D.editor
Author(s): McCourt, Stepheneditor
Author(s): Perchuk, Leonid L.editor
Affiliation: University of Johannesburg, Geology Department, Johannesburg, South Africa
Affiliation: University of Johannesburg, Department of Geology, Auckland Park, South Africa
Pages: 85-106
Published: 2011
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 106
Accession Number: 2011-102888
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
S23°30'00" - S20°00'00", E27°00'00" - E32°00'00"
Secondary Affiliation: University of KwaZulu Natal, ZAF, South AfricaMoscow State University, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201152
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