Granitoid Gneisses of the Morokweng Impact Structure: Implications for Neoarchaean Evolution of the Western Kaapvaal Craton

2021 ◽  
Author(s):  
Roger Gibson ◽  
S’lindile S. Wela ◽  
Grant M. Bybee ◽  
Dirk Frei ◽  
Marco A.G. Andreoli
Keyword(s):  
Kaapvaal Craton ◽  
Impact Structure ◽  
Granitoid Gneisses

Granitoids and greenstones of the White Mfolozi Inlier, south-east Kaapvaal Craton

2020 ◽  
Vol 123 (3) ◽  
pp. 263-276
Author(s):  
A. Hofmann ◽  
H. Xie ◽  
L. Saha ◽  
C. Reinke
Keyword(s):  
Regional Metamorphism ◽  
Ductile Deformation ◽  
Kaapvaal Craton ◽  
Direct Response ◽  
Southeastern Part ◽  
Kwazulu Natal ◽  
Growth History ◽  
History Of ◽  
Granite Batholith ◽  
Granitoid Gneisses

Abstract A Palaeoarchaean greenstone fragment and associated granitoid gneisses from an area south of Ulundi in KwaZulu-Natal is described. The fragment consists of an association of garnetiferous amphibolite and calc-silicate that was intruded at 3388 ± 4 Ma by tonalite and at 3275 ± 4 Ma by trondhjemite. Strong ductile deformation of the greenstones and granitoids under amphibolite facies conditions (7 kbar and 600 to 650°C) took place prior to uplift and emplacement of a granite batholith at ~3.25 Ga ago in which the granitoid gneiss-greenstone domain is now found. Magmatism 3.27 to 3.25 Ga ago was a direct response to regional metamorphism and anataxis, and gave rise to stabilization of the southeastern Kaapvaal Craton at that time, earlier than other parts of the craton. Deposition of quartz-arenites on stable granitic basement took place <3.1 Ga ago. Contrasting ages in magmatic pulses and regional metamorphism reflect a different crustal growth history of the eastern and southeastern part of the Kaapvaal Craton.

FLYNN CREEK IMPACT STRUCTURE, TENNESSEE: AN OVERVIEW

2018 ◽  
Author(s):  
Steven J. Jaret ◽  
◽  
David T. King
Keyword(s):  
Impact Structure
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