Structural Analysis of the Western Afar Margin, East Africa: Evidence for Multiphase Rotational Rifting
作者： F. Zwaan , G. Corti , F. Sani , D. Keir , A. A. Muluneh
DOI: 10.1029/2019TC006043
关键词:
摘要: The Afar region in East Africa represents a key location to study continental breakup. We present an integrated structural analysis of the Western Margin (WAM) aiming better understand rifted margin development and role plate rotation during rifting. New information from remote sensing, fieldwork, earthquake data sets reveals that N‐S striking WAM is still actively deforming characterized by NNW‐SSE normal faulting as well series marginal grabens. Seismicity distribution first‐ever borehole‐calibrated sections this developing passive show recent slip concentrated along antithetic faults. Tectonic stress parameters derived focal mechanisms reveal different extension directions (82°N), (66°N) Main Ethiopian Rift (108°N). Fault yields same direction. Combined with GPS data, shows current tectonics dominated local Danakil Block, considered have occurred since 11 Ma. Earlier stages (since 31–25 Ma) were most likely related large‐scale Arabian plate. Various authors proposed scenarios for evolution WAM. Any complete model should consider, among other factors, multiphase tectonic history fault activity margin. findings are not only relevant understanding but also provide insights into rotational rifting formation general.
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sci-hub.se 参考文章(116)
I. Davison, M. R. Tatnell, L. A. Owen, G. Jenkins, J. Baker, Tectonic geomorphology and rates of crustal processes along the Red Sea margin, north-west Yemen Springer, Dordrecht. pp. 595- 612 ,(1998) , 10.1007/978-94-011-4930-3_32
Giacomo Corti, Ian D. Bastow, Derek Keir, Carolina Pagli, Elizabeth Baker, Rift-Related Morphology of the Afar Depression World Geomorphological Landscapes. pp. 251- 274 ,(2015) , 10.1007/978-94-017-8026-1_15
Mauro Coltorti, Dario Firuzabadi, Andrea Borri, Pierlorenzo Fantozzi, Pierluigi Pieruccini, Planation Surfaces and the Long-term Geomorphological Evolution of Ethiopia World Geomorphological Landscapes. ,vol. 1, pp. 117- 136 ,(2015) , 10.1007/978-94-017-8026-1_5
Ernesto Abbate, Piero Bruni, Mario Sagri, Geology of Ethiopia: A Review and Geomorphological Perspectives World Geomorphological Landscapes. pp. 33- 64 ,(2015) , 10.1007/978-94-017-8026-1_2
William Bosworth, Geological Evolution of the Red Sea: Historical Background, Review, and Synthesis The Red Sea. pp. 45- 78 ,(2015) , 10.1007/978-3-662-45201-1_3
Paolo Billi, Geomorphology of Ephemeral Streams in the Kobo Basin World Geomorphological Landscapes. pp. 213- 225 ,(2015) , 10.1007/978-94-017-8026-1_12
Massimiliano Fazzini, Carlo Bisci, Paolo Billi, The Climate of Ethiopia World Geomorphological Landscapes. pp. 65- 87 ,(2015) , 10.1007/978-94-017-8026-1_3
L. Kogan, S. Fisseha, R. Bendick, R. Reilinger, S. McClusky, R. King, T. Solomon, Lithospheric strength and strain localization in continental extension from observations of the East African Rift Journal of Geophysical Research: Solid Earth. ,vol. 117, ,(2012) , 10.1029/2011JB008516
Simon McClusky, Robert Reilinger, Ghebrebrhan Ogubazghi, Aman Amleson, Biniam Healeb, Philippe Vernant, Jamal Sholan, Shimelles Fisseha, Laike Asfaw, Rebecca Bendick, Lewis Kogan, Kinematics of the southern Red Sea-Afar Triple Junction and implications for plate dynamics Geophysical Research Letters. ,vol. 37, ,(2010) , 10.1029/2009GL041127
J. O. S. Hammond, J.-M. Kendall, G. W. Stuart, D. Keir, C. Ebinger, A. Ayele, M. Belachew, The nature of the crust beneath the Afar triple junction: Evidence from receiver functions Geochemistry Geophysics Geosystems. ,vol. 12, ,(2011) , 10.1029/2011GC003738