Magma-assisted rifting in Ethiopia

Nature

Volumn 433, Issue 7022, 2005, Pages 146-148

  Kendall, J M ^a   Stuart, G W ^a   Ebinger, C J ^b   Bastow, I D ^a   Keir, D ^b  

^a UNIVERSITY OF LEEDS   (United Kingdom)

^b UNIVERSITY OF LONDON   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

ANISOTROPY; CATCHMENTS; DEFORMATION; EARTH ATMOSPHERE; SEISMOLOGY; STRESSES; TECTONICS;

LITHOSPHERE; LITHOSPHERIC HEATING; MANTLE; OCEAN BASINS;

OCEANOGRAPHY;

CONTINENTAL BREAKUP; MAGMA; PLATE TECTONICS; RIFTING; SEISMIC ANISOTROPY;

ANISOTROPY; ARTICLE; ASTHENOSPHERIC UPWELLING; CONTINENTAL SHELF; CRYSTAL STRUCTURE; EARTHQUAKE; ETHIOPIA; GEOLOGICAL TIME; GEOLOGY; PRIORITY JOURNAL; SHEAR STRESS; VOLCANO;

AFRICA; EAST AFRICA; EAST AFRICAN RIFT; EASTERN HEMISPHERE; ETHIOPIA; ETHIOPIAN RIFT; SUB-SAHARAN AFRICA; WORLD;

EID: 12744260140     PISSN: 00280836     EISSN: None     Source Type: Journal    
DOI: 10.1038/nature03161     Document Type: Article

References (30)

1. Buck, W. R. in Rheology and Deformation of the Lithosphere at Continental Margins (eds Karner, G. D., Taylor, B., Driscoll, N. W. & Kohlstedt, D. L.) 1-30 (Columbia Univ. Press, New York, 2004).
2. Bott, M. H. P. Sublithospheric loading and plate-boundary forces. Phil. Trans. R. Soc. Lond. 337, 83-93 (1991).
3. Kendall, J.-M. in Earth's Deep Interior: Mineral Physics and Tomography from the Atomic to the Global Scale (eds Karato, S., Stixrude, L., Liebermann, R. C., Masters, T. G. & Forte, A. M.) 149-175 (Geophys. Monogr. Ser. 117, American Geophysical Union, Washington DC, 2000).
4. McClusky, S., Reilinger, R., Mahmoud, S., Ben Sari, D. & Tealab, A. GPS constraints on Africa (Nubia) and Arabia plate motions. Geophys. J. Int. 155, 126-138 (2003).
5. Chu, D. & Gordon, R. Evidence for motion between Nubia and Somalia along the Southwest Indian Ridge. Nature 398, 64-67 (1998).
6. Maguire, P. et al. Geophysical project in Ethiopia studies continental breakup. Eos 84, 337-340 (2003).
7. Ebinger, C. J. & Casey, M. Continental breakup in magmatic provinces: An Ethiopian example. Geology 29, 527-530 (2001).
8. Mackenzie, G. D., Thybo, H. & Maguire, P. K. H. Crustal velocity structure across the Main Ethiopian Rift: results from 2-dimensional wide-angle seismic modelling. Geophys. J. Int. (in the press).
9. Bastow, I., Stuart, G. W., Kendall, J.-M. & Ebinger, C. J. Upper-mantle seismic structure in a region of incipient continental breakup: Northern Ethiopian Rift. Geophys. J. Int. (submitted).
10. Silver, P. G. Seismic anisotropy beneath the continents. Annu. Rev. Earth Planet. Sci. 24, 385-432 (1996).
11. Savage, M. Seismic anisotropy and mantle deformation: What have we learned from shear wave splitting. Rev. Geophys. 37, 65-106 (1999).
12. Gao, S. et al. SKS splitting beneath continental rift zones. J. Geophys. Res. 102, 22781-22797 (1997).
13. Ayele, A., Stuart, G. W. & Kendall, J.-M. Insights into rifting from shear-wave splitting and receiver functions: an example from Ethiopia. Geophys. J. Int. 157, 354-362 (2004).
14. Walker, K., Nyblade, A. A., Klemperer, S. L., Bokelmann, G. H. R. & Owens, T. J. On the relationship between extension and anisotropy: Constraints from shear wave splitting across the East Africa Plateau. J. Geophys. Res. 109, doi:10.1029/2003JB002866 (2003).
15. Gashawbeza, E. M., Klemperer, S. L., Nyblade, A. A., Walker, K. T. & Keranen, K. M. Shear-wave splitting in Ethiopia: Percambrian mantle anisotropy locally modified by Neogene rifting. Geophys. Res. Lett. 31, doi:10.1029/2004GL020471 (2004).
16. Hadiouche, O., Jobert, N. & Montagner, J.-P. Anisotropy of the African Continent inferred from surface waves. Phys. Earth Planet. Inter. 58, 61-81 (1989).
17. Rumpker, G. & Ryberg, T. New 'Fresnel zone' estimates for shear-wave splitting observations from finite difference modelling. Geophys. Res. Lett. 27, 2005-2008 (2000).
18. Barruol, G. & Ben-Ismail, W. Upper mantle anisotropy beneath the African IRIS and GEOSCOPE stations. Geophys. J. Int. 146, 549-561 (2001).
19. Wolfenden, E., Ebinger, C., Yirgu, G., Deino, A. & Ayalew, D. Evolution of the northern Main Ethiopian rift: Birth of a triple junction. Earth Planet. Sci. Lett. 224, 213-228 (2004).
20. Abdelselam, M. & Stern, R. Sutures and shear zones in the Arabia-Nubian shield. J. Afr. Earth Sci. 23, 289-310 (1996).
21. Moore, H. & Davidson, A. Rift structure in southern Ethiopia. Tectonophysics 46, 159-173 (1978).
22. Blackmail, D. K. et al. Teleseismic imaging of subaxial flow at mid-ocean ridges: travel-time effects of anisotropic mineral texture in the mantle. Geophys. J. Int. 127, 415-426 (1996).
23. Vauchez, A., Tommasi, A., Barruol, G. & Maumus, J. Upper mantle deformation and seismic anisotropy in continental rifts. Phys. Chem. Earth 25, 111-117 (2000).
24. Wolfe, C. J. & Solomon, S. C. Shear-wave splitting and implications for mantle flow beneath the MELT region of the East Pacific Rise. Science 280, 1230-1232 (1998).
25. Kendall, J.-M. Teleseismic arrivals at a mid-ocean ridge: effects of mantle melt and anisotropy. Geophys. Res. Lett. 21, 301-304 (1994).
26. Rooney, T. O., Furman, T., Yirgu, G. & Ayalew, D. Structure of the Ethiopian lithosphere: evidence from mantle xenoliths. Geochim. Cosmochim. Acta (submitted).
27. Holtzman, B. K. et al. Melt segregation and strain partitioning: Implications for seismic anisotropy and mantle flow. Science 301, 1227-1230 (2003).
28. Sleep, N. H. Lateral flow and ponding of starting plume material. J. Geophys. Res. 102, 10001-10012 (1997).
29. Wernicke, B. Low angle normal faults in Basin and Range province: Nappe tectonics in an extending orogen. Nature 291, 645-648 (1981).
30. Bilham, R. et al. Secular and tidal strain across the Ethiopian rift. Geophys. Res. Lett. 27, 2789-2984 (1999).