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Koehn, D.; Link, K.; Sachau, T.; Passchier, C.W.; Aanyu, K.; Spikings, A.; Harbinson, R. (2016)
Publisher: Springer Verlag
Languages: English
Types: Article
Subjects:
This contribution discusses the development of the Paleoproterozoic Buganda-Toro belt in the Rwenzori mountains and its influence on the western part of the East African Rift System in Uganda. The Buganda-Toro belt is composed of several thick-skinned nappes consisting of Archaean Gneisses and Palaeoproterozoic cover units that are thrusted northwards. The high Rwenzori mountains are located in the frontal unit of this belt with retrograde greenschist facies gneisses towards the north, which are unconformably overlain by metasediments and amphibolites. Towards the south the metasediments are overthrust by the next migmatitic gneiss unit that belongs to a crustal scale nappe. The southwards dipping metasedimentary and volcanic sequence in the high Rwenzori mountains shows an inverse metamorphic grade with greenschist facies conditions in the north and amphibolite facies conditions in the south. Early D1 deformation structures are overgrown by cordierite, which in turn grows into D2 deformation, representing the major northwards directed thrusting event. We argue that the inverse metamorphic gradient develops because higher grade rocks are exhumed in the footwall of a crustal scale nappe whereas the exhumation decreases towards the north away from the nappe leading to a decrease in metamorphic grade. The D2 deformation event is followed by a D3 E-W compression, a D4 with the development of steep shear zones with a NNE-SSW and SSE-NNW trend including the large Nyamwamba shear followed by a local D5 retrograde event and D6 brittle inverse faulting. The Paleoproterozoic Buganda-Toro belt is relatively stiff and crosses the NNE-SSW running rift system exactly at the node where the highest peaks of the Rwenzori mountains are situated and where the lake George rift terminates towards the north. Orientation of brittle and ductile fabrics show some similarities indicating that the cross-cutting Buganda-Toro belt influenced rift propagation and brittle fault development within the Rwenzori mountain and that this stiff belt may form part of the reason why the Rwenzori mountains are relatively high within the rift. \ud Keywords: East African Rift, Basement, Buganda Toro, Inverse Metamorphic Gradient, Microtectonics, Rwenzori mountains
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    • Bailey, A. I. 1969. Report on the geology of the Watamagufu-Bugoye area of the Ruwenzori Mountains. 13th Ann. Rept. Inst. Afr. Geol. Univ. Leeds, 13-14.
    • Cahen L, Snelling NJ, Delhal J, Vail JR (1984) The geochronology and evolution of Africa. Clarendon Press, Oxford Chorowicz, J., 2005, The East African rift system: Journal of African Earth Sciences, v. 43, n. 1-3, p. 379 - 410, http://dx.doi.org/10.1016/j.jafrearsci.2005.07.019 Delvaux D., Kervyn, F., Macheyeki, A.S., Temu, E.B. (2012) Geodynamic significance of the TRM segment in the East African Rift (W-Tanzania): Active tectonics and paleostress in the Ufipa plateau and Rukwa basin. Journal of Structural Geology, 37, 161-180 De Waele B, Johnson SP, Pisarevsky SA (2008) Paleoproterozoic to Neoproterozoic growth and evolution of the eastern Congo Craton. Its role in the Rodenia puzzle. Precambrian Res 160(2):127-141 Ebinger, C. J., 1989, Tectonic development of the western branch of the East African rift system: Geological Society of America Bulletin, v. 101, n. 7, p. 885- 903, http://dx.doi.org/10.1130/0016-7606(1989)1010885:TDOTWB2.3.CO;2 Koehn, D., Lindenfeld, M., Ruempker, G., Aanyu, K., Haines, S., Passchier, C. W., and Sachau, T., 2010, Active transsection faults in rift transfer zones: evidence for complex stress fields and implications for crustal fragmentation processes in the
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