Kalahari Craton
The Kalahari Craton is a
Parts of the Kalahari Craton are now in East Antarctica (the
The name was introduced by Clifford 1970.[3]Formation
Following a terminology introduced in 2008,
The Kaapvaal Craton, Zimbabwe Craton, and Limpopo Belt are made of Archaean terranes and contain crust at least 3.2 Ga and are underlain by a thick (250 km (160 mi)) layer of buoyant mantle that is producing garnets and diamonds.[1]
During the Palaeoproterozoic the northwest margin of the Archaean core grew by accretion and had formed a Proto-Kalahari Craton by 1.75 Ga. During the period 1.4–1.0 Ga subduction occurred along the northwest margin followed by continental collisions along the eastern and southern margins. By this time enough Mesoproterozoic crust had accreted to transform the Kalahari Craton. At 1.11 Ga, during the assembly of the supercontinent Rodinia, the Kalahari Craton was affected by the Umkondo-Borg Large Igneous Province.[2] At c. 1.15–.98 Ga the Kalahari Craton collided with the eastern margin of Laurentia.[4]
See also
References
- ^ a b Zeh, Gerdes & Barton Jr 2009, Kalahari Craton, pp. 934–935
- ^ a b Jacobs et al. 2008, Abstract
- ^ a b c Jacobs et al. 2008, Introduction, pp. 2–3
- ^ Dalziel, Mosher & Gahagan 2000, Abstract
Bibliography
- Clifford, T. N. (1970). "The structural framework of Africa". In Clifford, T.N.; Gass, I.G. (eds.). African magmatism and tectonics. Edinburgh: Oliver and Boyd. pp. 1–26.
- Dalziel, I. W.; Mosher, S.; Gahagan, L. M. (2000). "Laurentia-Kalahari collision and the assembly of Rodinia". The Journal of Geology. 108 (5): 499–513. S2CID 140187051.
- Jacobs, J.; Pisarevsky, S.; Thomas, R. J.; Becker, T. (2008). "The Kalahari Craton during the assembly and dispersal of Rodinia" (PDF). Precambrian Research. 160 (1–2): 142–158. . Retrieved 11 August 2018.
- Zeh, A.; Gerdes, A.; Barton Jr, J. M. (2009). "Archean accretion and crustal evolution of the Kalahari Craton—the zircon age and Hf isotope record of granitic rocks from Barberton/Swaziland to the Francistown Arc". Journal of Petrology. 50 (5): 933–966. .