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Long-term cooling history of the Albertine Rift: new evidence from the western rift shoulder, DR Congo
Stockholm University, Faculty of Science, Department of Geological Sciences.
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Number of Authors: 6
2016 (English)In: International journal of earth sciences, ISSN 1437-3254, E-ISSN 1437-3262, Vol. 105, no 6, 1707-1728 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 105, no 6, 1707-1728 p.
Keyword [en]
East African Rift System, Albertine Rift, Low-temperature thermochronology, Apatite fission-track, Thermal history modelling, Long-term landscape evolution
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-135055DOI: 10.1007/s00531-015-1146-6ISI: 000382086400003OAI: oai:DiVA.org:su-135055DiVA: diva2:1043724
Available from: 2016-10-31 Created: 2016-10-31 Last updated: 2016-10-31Bibliographically approved

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Ring, Uwe
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