Damara orogeny

The Damara orogeny was part of the Pan-African orogeny. The Damara orogeny occurred late in the creation of Gondwana, at the intersection of the Congo and the Kalahari cratons.[1]

The Damara orogeny involved the suturing of the Congo–São Francisco and Río de la Plata cratons at 580–550 Ma (together with India forming northern Gondwana) before the amalgamation of the Kalahari and Mawson cratons in the Kuunga–Damara orogeny at 530 Ma (southern Gondwana).[2]

The Adamastor Ocean closed southwards from the Araçuaı́ Belt (São Francisco Craton, now in South America) to the Kaoko Belt (Congo Craton, now in Africa) 580–550 Ma and 545–530 Ma Gariep Belt (Kalahari Craton, now in southern Africa). The Damara orogeny saw a peak in deformation and metamorphism at 530–500 Ma. Thrusting occurred onto the Kalahari Craton until 480 Ma.[2]

Río de la Plata docked to Congo before the closure of the Damara Belt oceans (Mozambique and Khomas) which made the Damara orogeny part of the Kuunga orogeny which stretched from Antarctica to India across Africa. All African cratons had been assembled by c. 550 Ma and the last stages of the Damara–Kuunga Orogeny (the final amalgamation of north and South Gondwana) were intra-cratonic.[2]

The Damara orogeny created the Naukluft Mountains in central Namibia between 550 Ma and 495 Ma.[1]

See also

References

  1. ^ a b Gray et al. 2008; Jung & Mezger 2003; Jung, Hoernes & Mezger 2000; Kukla 1993; Kukla et al. 1991
  2. ^ a b c Gray et al. 2008, Abstract

Bibliography

  • Gray, D. R.; Foster, D. A.; Meert, J. G.; Goscombe, B. D.; Armstrong, R.; Trouw, R. A. J.; Passchier, C. W. (2008). "A Damara orogen perspective on the assembly of southwestern Gondwana". Geological Society, London, Special Publications. 294 (1): 257–278. Bibcode:2008GSLSP.294..257G. doi:10.1144/SP294.14. S2CID 129878872. Retrieved 7 May 2017.
  • Jung, S.; Hoernes, S.; Mezger, K. (2000). "Geochronology and petrogenesis of Pan-African, syn-tectonic, S-type and post-tectonic A-type granite (Namibia): products of melting of crustal sources, fractional crystallization and wall rock entrainment". Lithos. 50 (4): 259–287. Bibcode:2000Litho..50..259J. doi:10.1016/S0024-4937(99)00059-6. Retrieved 7 May 2017.
  • Jung, S.; Mezger, K. (2003). "U-Pb garnet chronometry in high-grade rocks—case studies from the central Damara orogen (Namibia) and implications for the interpretation of Sm-Nd garnet ages and the role of high U-Th inclusions". Contributions to Mineralogy and Petrology. 146 (3): 382–396. Bibcode:2003CoMP..146..382J. doi:10.1007/s00410-003-0506-6. S2CID 128943289.
  • Kukla, C. (1993). "Strontium isotope heterogeneities in amphibolite facies, banded metasediments: a case study from the Late Proterozoic Kuiseb formation of the Southern Damara orogen, Central Namibia". Communications of the Geological Survey of Namibia Memoir. 15.
  • Kukla, C.; Kramm, U.; Kukla, P. A.; Okrusch, M. (1991). "U-Pb monazite data relating to metamorphism and granite intrusion in the northwestern Khomas Trough, Damara Orogen, central Namibia". Communications of the Geological Survey of Namibia. 7: 49–54.


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