globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228968
论文题名:
The anomalously-propagating South Kenya rift in the context of the North Tanzanian Divergence zone, East Africa
作者: Le Gall B.; Gama R.; Koptev A.; Chazot G.; Boniface N.; Loget N.; Daoud M.A.; Tarits P.; Plasman M.; Hautot S.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 814
语种: 英语
中文关键词: Extension ; Morphostructural pattern ; North Tanzanian Divergence ; Satellite imagery ; South 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
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
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170834
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Tectonophysics,2021-01-01,814
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