气候变化领域集成服务门户(CCPortal): Tectonic link between the Neoproterozoic dextral shear fabrics and Cenozoic extension structures of the Mekelle basin; Northern Ethiopia

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DOI	10.1007/s00531-020-01882-0
	Tectonic link between the Neoproterozoic dextral shear fabrics and Cenozoic extension structures of the Mekelle basin; Northern Ethiopia
	Hagos M.; Gebreyohannes T.; Amare K.; Hussien A.; Berhane G.; Walraevens K.; Koeberl C.; van Wyk de Vries B.; Cavalazzi B.
发表日期	2020
ISSN	14373254
起始页码	1957
结束页码	1974
卷号	109 期号:6
英文摘要	The Mekelle basin (area ~ 5500 km2) is located at the immediate western margin of the Afar Depression, which has a history of collision, subsidence, uplift, magmatism and now rifting. The evolution of such small to medium size basins as the Mekelle in a complicated geodynamic set-up is a subject of debate, because several different mechanisms of basin formation could apply. To address the possible basin evolution scenarios, we combine structural and dynamic analyses of northern Ethiopia, with strong emphasis on the basin and basin bounding basement rocks. The northern basin bounding block is uplifted by about 1500 m compared with the western and southwestern basin-bounding blocks. In the basin, superposition of large-scale orthogonal brittle shear fabrics and the development of young, parallel to subparallel extensional fractures and domino faulting have produced a total of ~ 2200 m vertical displacement. These observations, coupled with the absence of gradual roll-down of the internal basin (i.e., absence of bending/folding of an elastic beam supported at both ends), imply that Mekelle basin is not an IntraCONtinental Sags (ICONS) or plate interior basin, as previously described, but is instead a multi-tectonic triggered basin. Integrated satellite images using ground-controlled measurements and deep borehole data were used to decipher the entire evolution of the basin starting from the late-collisional deformation through the regional up-doming to the sills/dikes injection and basin formation. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	Afar depression; Domino faulting; IntraCONtinental sags; Mekelle basin; Subsidence; Superposition
语种	英语
scopus关键词	basement rock; basin evolution; Cenozoic; deformation; extensional tectonics; faulting; geodynamics; Proterozoic; satellite imagery; tectonic structure; uplift; Ethiopia; Mekelle Basin
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147647
作者单位	School of Earth Science, Mekelle University, P.O.Box 231, Mekelle, Ethiopia; Laboratory for Applied Geology and Hydrogeology, Ghent University, Krijgslaan 281–S8, Ghent, 9000, Belgium; Department of Lithospheric Research, University of Vienna, Althanstrasse 14, Vienna, 1090, Austria; Natural History Museum, Burgring 7, Vienna, A-1010, Austria; Observatoire du Physique du Globe de Clermont, Laboratoire Magmas et Volcans, Universié Clermont Auvergne, UMR6524-CNRS, Clermont-Ferrand, France; Departimento Di Scienze Biologiche, Geologiche E Ambientali, Universita Di Bologan, Bologna, Italy
推荐引用方式 GB/T 7714	Hagos M.,Gebreyohannes T.,Amare K.,et al. Tectonic link between the Neoproterozoic dextral shear fabrics and Cenozoic extension structures of the Mekelle basin; Northern Ethiopia[J],2020,109(6).
APA	Hagos M..,Gebreyohannes T..,Amare K..,Hussien A..,Berhane G..,...&Cavalazzi B..(2020).Tectonic link between the Neoproterozoic dextral shear fabrics and Cenozoic extension structures of the Mekelle basin; Northern Ethiopia.International Journal of Earth Sciences,109(6).
MLA	Hagos M.,et al."Tectonic link between the Neoproterozoic dextral shear fabrics and Cenozoic extension structures of the Mekelle basin; Northern Ethiopia".International Journal of Earth Sciences 109.6(2020).