New U-Pb zircon ages for the Kuboos pluton in the Pan-African Gariep belt, South Africa: Cambrian mantle plume or far field collision effect?

2000 ◽  
Vol 103 (3-4) ◽  
pp. 207-214 ◽  
Author(s):  
H.E. Frimmel
Keyword(s):  
South Africa ◽  
Mantle Plume ◽  
Far Field ◽  
Pan African ◽  
Collision Effect ◽  
Gariep Belt

Controls of host rock mineralogy and H2O content on the nature of pseudotachylyte melts: Evidence from Pan-African faulting in the foreland of the Gariep Belt, South Africa

2013 ◽  
Vol 608 ◽  
pp. 552-575 ◽  
Author(s):  
S.H. Büttner ◽  
S. Sherlock ◽  
L. Fryer ◽  
J. Lodge ◽  
T. Diale ◽  
...  
Keyword(s):  
South Africa ◽  
Host Rock ◽  
Pan African ◽  
Gariep Belt

Identification of a new 485 Ma post-orogenic mafic dyke swarm east of the Pan-African Saldania-Gariep Belt of South Africa

2021 ◽  
Vol 354 ◽  
pp. 106043
Author(s):  
Cole G. Kingsbury ◽  
Martin B. Klausen ◽  
Ulf Söderlund ◽  
Wladyslaw Altermann ◽  
Richard E. Ernst
Keyword(s):  
South Africa ◽  
Dyke Swarm ◽  
Mafic Dyke ◽  
Pan African ◽  
Mafic Dyke Swarm ◽  
Gariep Belt

Neoproterozoic tectonic and climatic evolution recorded in the Gariep Belt, Namibia and South Africa

2002 ◽  
Vol 14 (1) ◽  
pp. 55-67 ◽  
Author(s):  
H. E. Frimmel ◽  
P. G. Fölling ◽  
P. G. Eriksson
Keyword(s):  
South Africa ◽  
Climatic Evolution ◽  
Gariep Belt

On the volcanic architecture, petrology and geodynamic setting of the 3.48 Ga Barberton komatiite suite, South Africa

2021 ◽  
Author(s):  
E.G. Grosch ◽  
J. Slama
Keyword(s):  
South Africa ◽  
Mantle Plume ◽  
Source Region ◽  
Crustal Contamination ◽  
Primitive Mantle ◽  
Geochemical Data ◽  
Geodynamic Setting ◽  
Crustal Material ◽  
Type Section ◽  
Formation Type

Abstract This study presents new field and petrological observations combined with geochemical data on a range of komatiitic to tholeiitic volcanic rocks from the ca. 3.48 Ga mid-lower Komati Formation type-section of the Barberton Greenstone Belt, South Africa. A range of mafic-ultramafic rocks is identified across a 1.44 km profile, leading to the proposition of a new preliminary volcanic architecture for the mid-lower Komati Formation type-section. Major, trace and rare earth element (REE) data in conjunction with Lu-Hf isotopic constraints indicate that the tholeiites, newly recognized high-magnesium basalts, basaltic komatiites and komatiites in the volcanic sequence have a primitive mantle signature with no geochemical affinity to Archaean or modern-day supra-subduction zone boninites. The whole rock initial εHf values of spinifex and massive komatiite flows in the lowermost part of the Komati type-section are negative, ranging between -1.9 and -3.1, whereas the second overlying spinifex and massive flow unit records positive initial εHf values between +0.5 and +4.7. A new geodynamic model involving crustal contamination of the mafic-ultramafic lavas is proposed for the Barberton mid-lower Komati Formation type-section, involving mantle plume-crust interaction. The new observations and data indicate that the komatiites erupted as a result of a mantle plume from a hot (>1 600oC) mid-Archaean mantle, in which the earliest volcanic flows were variably affected by crustal contamination during their ascent and eruption. The possibility of incorporation of lower crustal material and/or recycled crust residing in the mantle source region cannot be excluded. This indicates that modern-style plate tectonic processes, such as subduction, may not have been a requirement for the formation of the 3.48 Ga Barberton komatiite suite, with implications for the hydration state, geodynamic processes and secular thermal evolution of the Archaean mantle.

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