A mantle magma reservoir beneath an incipient mid-ocean ridge in Afar, Ethiopia

Nature Geoscience

Volumn 6, Issue 10, 2013, Pages 861-865

  Desissa, M ^a   Johnson, N E ^a   Whaler, K A ^a   Hautot, S ^b   Fisseha, S ^c   Dawes, G J K ^a  

^a UNIVERSITY OF EDINBURGH   (United Kingdom)

^b INSTITUT UNIVERSITAIRE EUROPÉEN DE LA MER   (France)

^c ADDIS ABABA UNIVERSITY   (Ethiopia)

Author keywords

[No Author keywords available]

Indexed keywords

BUOYANCY; CONTINENTAL BREAKUP; ELECTRICAL CONDUCTIVITY; MAGMA CHAMBER; MAGNETOTELLURIC METHOD; MID-OCEAN RIDGE; RIFTING; STRAIN ANALYSIS; UPPER MANTLE;

AFAR; ETHIOPIA;

EID: 84885016705     PISSN: 17520894     EISSN: 17520908     Source Type: Journal    
DOI: 10.1038/ngeo1925     Document Type: Article

References (30)

1. Wright, T. J. et al. Magma-maintained rift segmentation at continental rupture in the 2005 Afar dyking episode. Nature 442, 291-294 (2006
2. Rowland, J. V. et al. Fault growth at a nascent slow-spreading ridge: 2005 Dabbahu rifting episode Afar. Geophys. J. Int. 171, 1226-1246 (2007
3. Keir, D. et al. Evidence for focused magmatic accretion at segment centers from lateral dike injections captured beneath the Red Sea rift in Afar. Geology 37, 59-62 (2009
4. Ebinger, C. J. et al. Capturing magma intrusion and faulting processes during continental rupture: Seismicity of the Dabbahu (Afar) rift. Geophys. J. Int. 174, 1138-1152 (2008
5. Hamling, I. J., Ayele, A., Bennati, L., Calais, E. & Ebinger, C. J. Geodetic observations of the ongoing Dabbahu rifting episode: New dyke intrusions in 2006 and 2007. Geophys. J. Int. 178, 989-1003 (2009
6. Grandin, R. et al. Transient rift opening in response to multiple dike injections in the Manda Hararo rift (Afar, Ethiopia) imaged by time-dependent elastic inversion of interferometric synthetic aperture radar data. J. Geophys. Res. 115, B09403 (2010
7. Key, K., Constable, S., Liu, L. & Pommier, A. Electrical image of passive upwelling beneath the northern East Pacific Rise. Nature 495, 499-502 (2013
8. Canales, J. P., Collins, J. A., Escartín, J. & Detrick, R. S. Seismic structure across the rift valley of the Mid-Atlantic Ridge at 23- 20' (MARK area): Implications for crustal accretion processes at slow spreading ridges. J. Geophys. Res. 105, 28411-28425 (2000
9. MacGregor, L. M., Constable, S. & Sinha, M. C. The RAMESSES experiment-III. Controlled-source electromagnetic sounding of the Reykjanes Ridge at 57- 450N. Geophys. J. Int. 135, 773-789 (1998
10. Singh, S. C. et al. Discovery of a magma chamber and faults beneath a Mid-Atlantic Ridge hydrothermal field. Nature 442, 1029-1032 (2006
11. Heinson, G., Constable, S. & White, A. Episodic melt transport at mid-ocean ridges inferred from magnetotelluric sounding. Geophys. Res. Lett. 27, 2317-2320 (2000
12. Roberts, J. J. & Tyburczy, J. A. Partial-melt electrical conductivity: Influence of melt composition. J. Geophys. Res. 104, 7055-7065 (1999
13. Sternberg, B., Washburne, J. C. & Pellerin, L. Correction for the static shift in magnetotellurics using transient electromagnetic soundings. Geophysics 53, 1459-1468 (1988
14. Simpson, F. & Bahr, K. Practical Magnetotellurics (Cambridge Univ. Press, 2005
15. Caldwell, T. G., Bibby, H. M. & Brown, C. The magnetotelluric phase tensor. Geophys. J. Int. 158, 457-469 (2004
16. McNeice, G. W. & Jones, A. G. Multisite, multifrequency tensor decomposition of magnetotelluric data. Geophysics 66, 158-173 (2001
17. Siripunvaraporn, W. & Egbert, G. An efficient data sub-space inversion method for 2-D magnetotelluric data. Geophysics 65, 791-803 (2000
18. Hammond, J. O. S. et al. The nature of the crust beneath the Afar triple junction: Evidence from receiver functions. Geochem. Geophys. Geosys. 12, Q12004 (2011
19. Cornwell, D. G., Maguire, P. K. H., England, R. W. & Stuart, G. W. Imaging detailed crustal structure and magmatic intrusion across the Ethiopian Rift using a dense linear broadband array. Geochem. Geophys. Geosys. 11, Q0AB03 (2010
20. Nooner, S. L. et al. Post-rifting relaxation in the Afar region, Ethiopia. Geophys. Res. Lett. 36, L21308 (2009
21. Guidarelli, M. et al. Surface wave tomography across Afar, Ethiopia: Crustal structure at a rift triple-junction zone. Geophys. Res. Lett. 38, L24313 (2011
22. Stork, A. et al. Uppermost mantle (Pn) velocity model for the Afar region, Ethiopia: An insight into rifting processes. Geophys. J. Int. 193, 321-328 (2013
23. Kendall, J. M., Stuart, G. W., Ebinger, C. J., Bastow, I. D. & Keir, D. Magma-assisted rifting in Ethiopia. Nature 433, 146-148 (2005
24. Keir, D. et al. Mapping the evolving strain field during continental breakup from crustal anisotropy in the Afar Depression. Nature Commun. 2, 285 (2011
25. Hashin, Z. & Shtrikman, S. A. variational approach to the theory of the effective magnetic permeability of multiphase materials. J. Appl. Phys. 33, 3125-3131 (1962
26. Li, S. et al. Partial melt or aqueous fluid in the mid-crust of Southern Tibet? Constraints from INDEPTH magnetotelluric data. Geophys. J. Int. 153, 289-304 (2003
27. Pommier, A. &Le Trong, E. SIGMELTS: A web portal for electrical conductivity calculations in geosciences. Comput. Geosci. 37, 1450-1459 (2011
28. Baba, K., Chave, A. D., Evans, R. L., Hirth, G. & Mackie, R. L. Mantle dynamics beneath the East Pacific Rise at 17-S: Insights from the Mantle Electromagnetic and Tomography (MELT) experiment. J. Geophys. Res. 111, B02101 (2006
29. Hayward, N. & Ebinger, C. Variations in along-axis segmentation of the Afar Rift System. Tectonics 15, 244-257 (1996
30. Belachew, M. et al. Comparison of dike intrusions in an incipient seafloor-spreading segment in Afar, Ethiopia: Seismicity perspectives. J. Geophys. Res. 116, B06405 (2011