Abstract
To determine the long-term landscape evolution of the Albertine Rift in East Africa, low-temperature thermochronology was applied and the cooling history constrained using thermal history modelling. Acquired results reveal (1) “old” cooling ages, with predominantly Devonian to Carboniferous apatite fission-track ages, Ordovician to Silurian zircon (U–Th)/He ages and Jurassic to Cretaceous apatite (U–Th–Sm)/He ages; (2) protracted cooling histories of the western rift shoulder with major phases of exhumation in mid-Palaeozoic and Palaeogene to Neogene times; (3) low Palaeozoic and Neogene erosion rates. This indicates a long residence time of the analysed samples in the uppermost crust, with the current landscape surface at a near-surface position for hundreds of million years. Apatite He cooling ages and thermal history models indicate moderate reheating in Jurassic to Cretaceous times. Together with the cooling age distribution, a possible Albertine high with a distinct relief can be inferred that might have been a source area for the Congo Basin.
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Acknowledgments
This study was funded by the DFG (Deutsche Forschungsgemeinschaft) through the research unit RiftLink (DFG research unit 703, GL 182/9-2). Further funding was provided by the DAAD (Deutscher Akademischer Austausch Dienst) through a short-term research stay grant. Field work was supported by the Ruwenzori State University in Butembo. We particularly thank Dr. Meni Malikwisha and Bin V. Mutete, as well as Celestin Kasereka Mahinda from Goma Volcano Observatory. We also gratefully acknowledge the support given by the ICCN (Institut Congolais pour la Conservation de la Nature), the CEEC (Centre of Evaluation, Expertise and Certification) and the Ministry of Mining. We express our thanks to the governor of North-Kivu for supporting us during our expedition. We also thank the officials from Bunia and the Local Chiefs of the entire region for their support. Acknowledgement is also given to the RiftLink research group for thorough discussions, to Alexis Ault and Benjamin Emmel for very helpful reviews, to the editor, Dieter Mertz, and to Anna Ksienzyk for their support. We thank Peter W. Reiners and Uttam Chowdhury for analytical assistance and valuable discussions. ASTER GDEM, product of METI & NASA, and OneGeology is thanked for providing their material.
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Bauer, F.U., Glasmacher, U.A., Ring, U. et al. Long-term cooling history of the Albertine Rift: new evidence from the western rift shoulder, D.R. Congo. Int J Earth Sci (Geol Rundsch) 105, 1707–1728 (2016). https://doi.org/10.1007/s00531-015-1146-6
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DOI: https://doi.org/10.1007/s00531-015-1146-6