Evidence for focused magmatic accretion at segment centers from lateral dike injections captured beneath the Red Sea rift in Afar

Geology

Volumn 37, Issue 1, 2009, Pages 59-62

  Keir, Derek ^a,b   Hamling, Ian J ^a   Ayele, Atalay ^c   Calais, Eric ^d   Ebinger, Cindy ^e   Wright, Tim J ^a   Jacques, Eric ^f   Mohamed, Kassim ^g   Hammond, James O S ^h   Belachew, Manahloh ^e   Baker, Elizabeth ^b   Rowland, Julie V ⁱ   Lewi, Elias ^c   Bennati, Laura ^d  

^a UNIVERSITY OF LEEDS   (United Kingdom)

^b UNIVERSITY OF LONDON   (United Kingdom)

^c ADDIS ABABA UNIVERSITY   (Ethiopia)

^d PURDUE UNIVERSITY   (United States)

^e UNIVERSITY OF ROCHESTER   (United States)

^f INSTITUT DE PHYSIQUE DU GLOBE DE PARIS   (France)

^g Observatoire de Géophysique d'Arta   (Djibouti)

^h UNIVERSITY OF BRISTOL   (United Kingdom)

ⁱ UNIVERSITY OF AUCKLAND   (New Zealand)

Author keywords

[No Author keywords available]

Indexed keywords

OCEANOGRAPHY; WATER INJECTION;

CONTINENTAL BREAK-UP; DIKE INTRUSION; KEY COMPONENT; LENGTH SCALE; LOWER CRUST; MAGMA RESERVOIRS; MECHANICAL STRETCHING; MID-OCEAN RIDGES; RED SEA; SATELLITE RADAR; SEAFLOOR SPREADING; SEISMICITY DATA; SOURCE REGION; SPATIAL AND TEMPORAL VARIABILITY; TIME-SCALES; UPPER MANTLE;

LEVEES;

ACCRETION; AFRICAN PLATE; ARABIAN PLATE; CONTINENTAL BREAKUP; DEFORMATION; DIKE; MAGMATISM; PLATE TECTONICS; RIFTING; SEAFLOOR SPREADING; SPATIAL VARIATION; SPREADING CENTER; STRAIN RATE; TEMPORAL VARIATION; TRIPLE JUNCTION;

AFAR; AFRICA; EAST AFRICA; INDIAN OCEAN; RED SEA [INDIAN OCEAN]; SUB-SAHARAN AFRICA;

EID: 67849104232     PISSN: 00917613     EISSN: 00917613     Source Type: Journal    
DOI: 10.1130/G25147A.1     Document Type: Article

References (31)

1. Abdallah, A., Courtillot, V., Kasser, M., Le Dain, A.Y., Lépine, J.C., Robineau, B., Ruegg, J.C., Tapponnier, P., and Tarantola, A., 1979, Relevance of Afar seismicity and volcanism to the mechanics of accreting plate boundaries: Nature, v. 282, p. 17-23, doi: 10.1038/ 282017a0.
2. Ayele, A., Stuart, G., Bastow, I., Keir, D., 2007, The August 2002 earthquake sequence in north Afar: Insights into the neotectonics of the Danakil microplate, v. 48, p. 70-79.
3. Barrat, J.A., Joron, J.L., Taylor, R.N., Fourcade, S., Nesbitt, R.W., and Jahn, B.M., 2003, Geochemistry of basalts from Manda Hararo, Ethiopia: LREE-depleted basalts in central Afar: Lithos, v. 69, p. 1-13, doi: 10.1016/S0024-4937(03)00044-6.
4. Bjornsson, A., Saemundsson, K., Einarsson, P., Tryggvason, E., and Gronvald, K., 1977, Current rifting episode in north Iceland: Nature, v. 266, p. 318-323, doi: 10.1038/266318a0.
5. Buck, W.R., 2004, Consequences of asthenospheric variability on continental rifting, in Karner, G.D., et al., eds., Rheology and deformation of the lithosphere at continental margins: New York, Columbia University Press, p. 1-30.
6. Buck, W.R., Einarsson, P., and Brandsdottir, B., 2006, Tectonic stress and magma chamber size as controls on dyke propagation: Constraints from the 1975-1984 Krafla rifting episode: Geophysical Journal International, v. 111, B12404, doi: 10.1029/2005JB003879.
7. Calais, E., Lewi, E., Wright, T., Hamling, I., Buck, R., Ayele, A., Yirgu, G., and Ebinger, C., 2006, Postdiking deformation following the September 2005 Afar tectono-magmatic event [abs.]: Eos (Transactions, American Geophysical Union), v. 87, Fall Meeting Supplement.
8. Delaney, J.R., Kelley, D.S., Lilley, M.D., Butterfield, D.A., Baross, J.A., Wilcock, W.S.D., Embley, R.W., and Summit, M., 1998, The quantum event of oceanic crustal accretion: Impacts of diking at mid-ocean ridges: Science, v. 281, p. 222-230, doi: 10.1126/science.281.5374.222.
9. Ebinger, C.J., Keir, D., Ayele, A., Calais, E., Wright, T.J., Belachew, M., Hammond, J.O.S., Campbell, M.E., and Buck, W.R., 2008, Capturing magma intrusion and faulting process during continental rupture: Seismicity of the Dabbahu (Afar) rift: Geophysical Journal International, v. 174, p. 1138-1152, doi: 10.111/ j.1365-246X.2008.03877.x.
10. Einarsson, P., and Brandsdottir, B., 1980, Seismological evidence for lateral magma intrusion during the July 1978 deflation of the Krafla volcano in NE-Iceland: Journal of Geophysical Research, v. 47, p. 160-165.
11. Fialko, Y.A., and Rubin, A.M., 1998, Thermodynamics of lateral dike propagation: Implications for crustal accretion at slow-spreading mid-ocean ridges: Journal of Geophysical Research, v. 103, p. 2501-2514.
12. Hayward, N.J., and Ebinger, C.J., 1996, Variations in the along-axis segmentation of the Afar rift system: Tectonics, v. 15, p. 244-257, doi: 10.1029/95TC02292.
13. Hofmann, C., Courtillot, V., Féraud, G., Rochette, P., Yirgu, G., Ketefo, E., and Pik, R., 1997, Timing of the Ethiopian flood basalt event and implications for plume birth and global change: Nature, v. 389, p. 838-841, doi: 10.1038/39853.
14. Keir, D., Ebinger, C.J., Stuart, G.W., Daly, E., and Ayele, A., 2006, Strain accommodation by magmatism and faulting as rifting proceeds to breakup: Seismicity of the northern Ethiopian rift: Journal of Geophysical Research, v. 111, B05314, doi: 10.1029/2005JB003748.
15. Lahitte, P., Gillot, P.-Y., Kidane, T., Courtillot, V., and Bekele, A., 2003, New age constraints on the timing of volcanism in central Afar, in the presence of propagating rifts: Journal of Geophysical Research, v. 108, no. B2, 2123, doi: 10.1029/2001JB001689.
16. Lin, J., Purdy, G.M., Schouten, H., Sempéré, J.-C., and Zervas, C., 1990, Evidence from gravity data for focused magmatic accretion along the Mid-Atlantic Ridge: Nature, v. 344, p. 627-632.
17. Lister, J.R., and Kerr, R.C., 1991, Fluid-mechanical models of crack propagation and their application to magma transport in dykes: Journal of Geophysical Research, v. 96, p. 10,049-10,077.
18. Makris, J., and Ginzburg, A., 1987, Afar Depression: Transition between continental rifting and seafloor spreading: Tectonophysics, v. 141, p. 199-214, doi: 10.1016/0040-1951(87)90186-7.
19. Manighetti, I., Tapponnier, P., Gillot, P.-Y., Jacques, E., Courtillot, V., Armijo, R., Ruegg, J.C., and King, G., 1998, Propagation of rifting along the Arabia-Somalia plate boundary: Into Afar: Journal of Geophysical Research, v. 103, p. 4947-4974, doi: 10.1029/97JB02758.
20. Montelli, R., Nolet, G., Dahlen, F., Masters, G., Engdahl, E., and Hung, S.-H., 2004, Finite-frequency tomography reveals a variety of plumes in the mantle: Science, v. 303, p. 338-343, doi: 10.1126/science.1092485.
21. Rivalta, E., and Segall, P., 2008, Magma compressibility and the missing source for some dike intrusions: Geophysical Research Letters, v. 35, L04306, doi: 10.1029/2007GL032521.
22. Roman, D.C., and Cashman, K.V., 2006, The origin of volcano-tectonic earthquake swarms: Geology, v. 34, p. 457-460, doi: 10.1130/G22269.1.
23. Rowland, J.V., Baker, E., Ebinger, C.J., Keir, D., Kidane, T., Biggs, J., Hayward, N., and Wright, T.J., 2007, Fault growth at a nascent slow-spreading ridge: 2005 Dabbahu rifting episode, Afar: Geophysical Journal International, v. 171, p. 1226-1246, doi: 10.1111/ j.1365-246X.2007.03584.x.
24. Rubin, A.M., and Gillard, D., 1998, Dike-induced earthquakes: Theoretical considerations: Journal of Geophysical Research, v. 103, p. 10,017-10,030, doi: 10.1029/97JB03514.
25. Singh, S.C., Crawford, W.C., Carton, H., Seher, T., Combier, V., Cannat, M., Canales, J.P., Düsünür, D., Escartin, J., and Miranda, J.M., 2006, Discovery of a magma chamber and faults beneath a Mid-Atlantic hydrothermal field: Nature, v. 442, p. 1029-1032, doi: 10.1038/nature05105.
26. Smith, D.K., and Cann, J.R., 1999, Constructing the upper crust of the Mid-Atlantic Ridge; a reinterpretation based on the Puna Ridge, Kilauea volcano: Journal of Geophysical Research, v. 104, p. 25,379-25,399.
27. Tolstoy, M., Harding, A.J., and Orcutt, J.A., 1993, Crustal thickness on the Mid-Atlantic Ridge: Bull's-eye gravity anomalies and focused accretion: Science, v. 262, p. 726-729, doi: 10.1126/ science.262.5134.726.
28. Tolstoy, M., and 14 others, 2006, A sea-floor spreading event captured by seismometers: Science, v. 314, p. 1920-1922, doi: 10.1126/ science.1133950.
29. Vigny, C., Huchon, P., Ruegg, J.-C., Khanbari, K., and Asfaw, L.M., 2006, Confirmation of Arabia slow motion by new GPS data in Yemen: Journal of Geophysical Research, v. 111, B02402, doi: 10.1029/ 2004JB003229.
30. Whitehead, J., Dick, J.H.B., and Schouten, H., 1984, A mechanism for magmatic accretion under spreading centres: Nature, v. 312, p. 146-148, doi: 10.1038/312146a0.
31. Wright, T.J., Ebinger, C., Biggs, J., Ayele, A., Yirgu, G., Keir, D., and Stork, A., 2006, Magma-maintained rift segmentation at continental rupture in the 2005 Afar dyking episode: Nature, v. 442, p. 291-294, doi: 10.1038/nature04978.