The geology of the Matala Dome: an important piece of the Pan-African puzzle in Central Zambia

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• 作者：K. V. Naydenov ; J. Lehmann ; K. Saalmann…
• 关键词：Pan ; African Orogen ; Central Zambia ; Matala Dome ; Metamorphic petrology ; U–Pb and Ar–Ar geochronology ; P ; T ; t reconstruction
• 刊名：International Journal of Earth Sciences
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：105
• 期：3
• 页码：695-712
• 全文大小：10,018 KB
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• 作者单位：K. V. Naydenov (1) (2)
  J. Lehmann (1)
  K. Saalmann (1) (3)
  L. Milani (1)
  J. Poterai (1) (4)
  J. A. Kinnaird (1)
  G. Charlesworth (1)
  J. D. Kramers (5)
  
  1. EGRI, School of Geosciences, University of the Witwatersrand (Wits), PVT Bag 3, Johannesburg, 2050, South Africa
  2. Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 24, 1113, Sofia, Bulgaria
  3. Norges Geologiske Undersøkelse (NGU), Postboks 6315 Sluppen, 7491, Trondheim, Norway
  4. Mimosa Mining Company, P Bag 638, Zvishavane, Zimbabwe
  5. Geology Department, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Geophysics and Geodesy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1437-3262

文摘

The Matala Dome (MD), an ENE-trending structure located at the junction between the Pan-African Lufilian and Zambezi belts, is cored by a Gneiss-Schist Unit with uncertain age overlain by a metasedimentary section (Quartzite-Schist Unit, Marble Unit and Carbonate-Siliciclastic Unit) of the Neoproterozoic to Cambrian Katanga Supergroup. The top of the Katangan stratigraphy is represented by synorogenic sedimentary rocks—Upper Siliciclastic Unit. An early event D1 resulted in the development of shallow-dipping metamorphic foliation S1 and pre- to syntectonic growth of garnet and kyanite in the schists of the Quartzite-Schist Unit. Pseudosections and garnet isopleth modelling on schist from this unit defined the peak metamorphism at P = 7.5–9.3 kbar and T = 620–700 °C. U–Pb detrital zircon dating revealed ca. 2.7 Ga source and a high-grade metamorphism during Pan-African times. The S1 foliation was affected by upright folding F2 with ENE-trending axes and associated subvertical crenulation fabric S2 development. The syn-D2 retrogression in the schists is marked by post-S1 staurolite crystallisation and further by chloritisation followed by sericitisation. The D2 event is interpreted to have exhumed the orogenic middle crust and to be responsible for the domal structure of the MD. 40Ar/39Ar dating of muscovite at 529.3 ± 5.6 to 526.3 ± 6.2 is interpreted to date the exhumation event. D2 is correlated with regional N–S shortening event at ca. 530–520 Ma. Based on the lithology, structural record, and time and facies of the metamorphism, a correlation between the MD and the northern part of the Zambezi Belt is suggested.