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DOI10.1016/j.tecto.2021.228968
The anomalously-propagating South Kenya rift in the context of the North Tanzanian Divergence zone, East Africa
Le Gall B.; Gama R.; Koptev A.; Chazot G.; Boniface N.; Loget N.; Daoud M.A.; Tarits P.; Plasman M.; Hautot S.
发表日期2021
ISSN00401951
卷号814
英文摘要The axial fault-bounded depression of the South Kenya rift (SKR) locally displays anomalously wide sectors resulting from the presence of one (or many) elevated and offset block(s) on the flanks of the main trough. Very little attention has been paid so far to the nature of the driving mechanisms responsible for these atypical rift patterns. New insights are supplied by the Natron-Ol Doinyo Ogol rift segment at the southern extremity of the SKR, immediately north of the North Tanzanian Divergence (NTD). On the basis of interpreted SRTM-30 satellite imagery and Digital Elevation Models, our work allows us: i) to depict the highly-segmented arrangement of the ~7 Ma-lasted SKR system, ii) to establish a two-stage kinematic rift model that emphasizes the role of an inherited transverse discontinuity on the arrest, as well as lateral jump and off-axis development of anomalously-propagating rift structures, iii) to define the relative contribution of border vs inner fault networks to the total extension, which is estimated at 7–6 km (11.6–9.2%), and iv) to emphasize that inner faulting was not the dominant mode of strain accommodation during recent inward focussing of strain, and that no sharp transition exists from border fault- to intra-rift fault-dominated strain accommodation over time in the SKR immature rift system. © 2021
关键词ExtensionMorphostructural patternNorth Tanzanian DivergenceSatellite imagerySouth Kenya Rift
英文关键词Satellite imagery; Digital elevation model; Dominant mode; Driving mechanism; Offset block; Propagating rift; Relative contribution; Sharp transition; Strain accommodations; Geologic models; digital elevation model; extensional tectonics; kinematics; morphostructure; rift zone; satellite imagery; Shuttle Radar Topography Mission; East African Rift; Kenya; Kenya Rift
语种英语
来源期刊Tectonophysics
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/208001
作者单位UMR/CNRS 6538 Géosciences Océan, Brest University, France; Department of Geology, Dar es Salaam University, Tanzania; Department of Geosciences, Tübingen university, Tübingen, Germany; UMR 7193, ISTeP, Sorbonne university, Paris, France; Centre d'Etudes et de Recherches de Djibouti, Djibouti; Institut de Physique du Globe, Paris, France; IMAGIR sarl, Brest, France
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GB/T 7714
Le Gall B.,Gama R.,Koptev A.,et al. The anomalously-propagating South Kenya rift in the context of the North Tanzanian Divergence zone, East Africa[J],2021,814.
APA Le Gall B..,Gama R..,Koptev A..,Chazot G..,Boniface N..,...&Hautot S..(2021).The anomalously-propagating South Kenya rift in the context of the North Tanzanian Divergence zone, East Africa.Tectonophysics,814.
MLA Le Gall B.,et al."The anomalously-propagating South Kenya rift in the context of the North Tanzanian Divergence zone, East Africa".Tectonophysics 814(2021).
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