Sensitivity analysis of rift induced delamination with application to Rwenzori Mountains

Geophysical Journal International

Volumn 187, Issue 3, 2011, Pages 1135-1145

  Wallner, Herbert ^a   Schmeling, Harro ^a  

^a GOETHE UNIVERSITY   (Germany)

Author keywords

Africa; Continental tectonics: extensional; Dynamics of lithosphere and mantle; Numerical approximations and analysis; Rheology: crust and lithosphere

Indexed keywords

AFRICA; CONTINENTAL RIFT; CONTINENTAL TECTONICS; CRITICAL TEMPERATURES; CRUSTAL BLOCK; GEODYNAMIC PROCESS; GEOMETRIC CHARACTERISTICS; GEOTHERMS; LOWER CRUST; MANTLE LITHOSPHERE; NUMERICAL APPROXIMATIONS; NUMERICAL MODELS; PARAMETER RANGE; PARAMETER REGIMES; PROPAGATING RIFT; QUANTITATIVE PARAMETERS; RHEOLOGICAL PROPERTY; RIFT SYSTEMS; SCOPE OF APPLICATION; SEISMIC VELOCITIES; STRESS-DEPENDENT; SURFACE EXPRESSION; TEMPERATURE ANOMALY;

ELASTICITY; GEODYNAMICS; GEOLOGIC MODELS; GEOMETRY; LANDFORMS; RHEOLOGY; SENSITIVITY ANALYSIS; STEEL SHEET; TECTONICS; UNCERTAINTY ANALYSIS;

DELAMINATION;

CRUSTAL STRUCTURE; DELAMINATION; EXTENSIONAL TECTONICS; GEODYNAMICS; LITHOSPHERIC STRUCTURE; MANTLE STRUCTURE; NUMERICAL METHOD; NUMERICAL MODEL; RHEOLOGY; RIFT ZONE; SENSITIVITY ANALYSIS; VOLCANISM;

RWENZORI MOUNTAINS;

EID: 81555202508     PISSN: 0956540X     EISSN: 1365246X     Source Type: Journal    
DOI: 10.1111/j.1365-246X.2011.05237.x     Document Type: Article

References (43)

1. Afonso, J.C. & Ranalli, G., 2004. Crustal and mantle strengths in continental lithosphere: is the jelly sandwich model obsolete? Tectonophysics, 394, 221-232.
2. Boven, A., Pasteels, P., Punzalan, L.E., Yamba, T.K. & Musisi, J.H., 1998. Quaternary perpotassic magmatism in Uganda (Toro-Ankole Volcanic Province): age assessment and significance for magmatic evolution along the East African Rift, J. Afr. Earth Sci., 26(3), 463-476.
3. Bird, P., 1979. Continental delamination and the Colorado Plateau, J. geophys. Res., 84, 7561-7571.
4. Bürgmann, R. & Dresen, G., 2008. Rheology of the lower crust and upper mantle: evidence from rock mechanics, geodesy, and field observations, J. geophys. Res., 36(1), 531-567.
5. Burov, E. & Watts, A.B., 2006. The long-term strength of continental lithosphere: "jelly-sandwich" or "crème-brûlée"? GSA Today, 16(1), 4-10.
6. Chopra, P.N. & Paterson, M.S., 1984. The role of water in the deformation of dunite, J. geophys. Res., 89, 7861-7876.
7. Chorowicz, J., 2005. The East African rift system, J. geophys. Res., 43, 379-410.
8. Connolly, J.A.D., 2010. The mechanics of metamorphic fluid expulsion, Elements, 6(3), 165-172.
9. Crameri, F. et al., 2011. A benchmark comparison of numerical surface topography calculations in geodynamic modelling, Geophys. J. Int., submitted.
10. Crosby, A.G., Fishwick, S. & White, N., 2010. Structure and evolution of the intracratonic Congo Basin, Geochem. Geophys. Geosyst., 11, Q06010, doi:.
11. Ducea, M.N., 2011. Fingerprinting orogenic delamination, Geology, 39(2), 191-192.
12. Etheridge, M.A., Wall, V.J. & Vernon, R. H., 1983. The role of the fluid phase during regional metamorphism and deformation, J. Metamorph. Geol., 1, 205-226.
13. Etheridge, M.A., Wall, V.J., Cox, S.F. & Vernon, R.H., 1984. High fluid pressures during regional metamorphism and deformation-implications for mass transport and deformation mechanisms, J. geophys. Res., 89, 4344-4358.
14. Fillerup, M.A., Knapp, J.H., Knapp, C.C. & Raileanu, V., 2010. Mantle earthquakes in the absence of subduction? Continental delamination in the Romanian Carpathians, Lithosphere, 2, 333-340.
15. Foley, S.F., Yaxley, G.M., Rosenthal, A., Buhre, S., Kiseeva, E.S., Rapp, R.P. & Jacob, D.E., 2009. The composition of near-solidus melts of peridotite in the presence of CO2 and H2O between 40 and 60 kbar, Lithos, 112, 274-283.
16. Göǧüş, O.H. & Pysklywec, R.N., 2008. Near surface diagnostics of dripping or delaminating lithosphere, J. geophys. Res., 113, B11404, doi:.
17. Hales, T.C., Abt, D.L., Humphreys, E.D. & Roering, J.J., 2005. A lithospheric instability origin for Columbia River flood basalts and Wallowa Mountains uplift in northeast Oregon, Nature, 438, 842-845.
18. Houseman, G., 1996. From mountains to basin, Nature, 379, 771-772.
19. Houseman, G.A., McKenzie, D.P. & Molnar, P., 1981. Convective instability of a thickened boundary-layer and its relevance for the thermal evolution of continental convergent belts, J. geophys. Res., 86, 6115-6132.
20. Ingebritsen, S.E. & Manning, C.E., 2002. Diffuse fluid flux through orogenic belts: implications for the world ocean, Proc. Natl. Acad. Sci. USA, 99, 9113-9116.
21. Jackson, J., 2002. Strength of the continental lithosphere: time to abandon the jelly sandwich? GSA Today, 12, 4-9.
22. Jackson, J., McKenzie, D., Priestley, K. & Emmerson, B., 2008. New views on the structure and rheology of the lithosphere, J. Geol. Soc. Lond., 165, 453-465.
23. Jakovlev, A., 2010. The crustal and upper mantle isotropic and anisotropic velocity structure beneath the Rwenzori Mountains from travel-time tomography, PhD thesis, Goethe-University, Frankfurt am Main.
24. Kampunzu, A.B., Bonhomme, M.G. & Kanika, M., 1998. Geochronology of volcanic rocks and evolution of the Cenozoic Western Branch of the East African Rift System, J. geophys. Res., 26(3), 441 - 461.
25. Kaus, B.J.P., 2010. Factors that control the angle of shear bands in geodynamic numerical models of brittle deformation, Tectonophysics, 484(1-4), 36-47.
26. Kirby, S.H. & Kronenberg, A.K., 1987. Rheology of the lithosphere: selected topics, Rev. Geophys., 25, 1219-1244.
27. Koehn, D., Lindenfeld, M., Rümpker, G., Aanyu, K., Haines, S., Passchier, C.W. & Sachau, T., 2010. Active transsection faults in rift transfer zones: evidence for complex stress fields and implications for crustal fragmentation processes in the western branch of the East African Rift, Int. J. Earth Sci., 99(7), 1633-1642.
28. Le Pourhiet, L., Gurnis, M. & Saleeby, J., 2006. Mantle instability beneath the Sierra Nevada mountains in California and Death Valley extension, Earth planet. Sci. Lett., 251(1-2), 104-119.
29. Levander, A., Schmandt, B., Miller, M.S., Liu, K. Karlstrom, K.E., Crow, R.S., Lee, C.-T.A. & Humphreys, E.D., 2011. Continuing Colorado plateau uplift by delamination-style convective lithospheric downwelling, Nature, 472, 461-465.
30. Link, K., Koehn, D., Barth, M.G., Tiberindwa, J.V., Barifaijo, E., Aanyu, K. & Foley, S., 2010. Continuous cratonic crust between the Congo and Tanzania blocks in western Uganda, Int. J. Earth Sci., 99(7), 1559-1573.
31. Morency, C. & Doin, M.-P., 2004. Numerical simulations of the mantle lithosphere delamination, J. geophys. Res., 109, B03410, doi:.
32. Platt, J.P. & England, P.C., 1994. Convective removal of lithosphere beneath mountain belts: thermal and mechanical consequences, Am. J. Sci., 294, 307-336.
33. Schmalholz, S.M., Kaus, B.J.P. & Burg, J.-P., 2009. Stress-strength relationship in the lithosphere during continental collision, Geology, 37(9), 775-778.
34. Schmeling, H., 2010. Dynamic models of continental rifting with melt generation, Tectonophysics, 480(1-4), 33-47.
35. Schmeling, H. & Marquart, G., 1991. The influence of second-scale convection on the thickness of the continental lithosphere and crust, Tectonophysics, 189, 281-306.
36. Schmeling, H. et al., 2008. A benchmark comparison of spontaneous subduction models-Towards a free surface, Phys. Earth planet. Inter., 171(1-4), 198-223.
37. Stamps, D.S., Calais, E., Saria, E., Hartnady, C., Nocquet, J.-M., Ebinger, C.J. & Fernandes, R.M., 2008. A kinematic model for the East African Rift, Geophys. Res. Lett., 35, 1-6, L05304, doi:.
38. Wallner, H. & Schmeling, H., 2010. Rift induced delamination of mantle lithosphere and crustal uplift: a new mechanism for explaining Rwenzori Mountains extreme elevation? Int. J. Earth Sci., 99(7), 1511-1524.
39. Weeraratne, D.S., Forsyth, D. W., Fischer, K.M. & Nyblade, A.A., 2003. Evidence for an upper mantle plume beneath the Tanzanian craton from Rayleigh wave tomography, J. geophys. Res., 108(B9), 2427, doi:.
40. Weinberg, R.F. & Schmeling, H., 1992. Polydiapirs: multiwave length gravity structures, J. Struct. Geol., 14, 425-436.
41. Wölbern, I., Rümpker, G., Schumann, A. & Muwanga, A., 2010. Crustal thinning beneath the Rwenzori region, Albertine Rift, Uganda, from receiver-function analysis, Int. J. Earth Sci., 99(7), 1545-1557.
42. Zencher, F., Bonafede, M. & Stefansson, R., 2006. Near-lithostatic pore pressure at seismogenic depths: a thermoporoelastic model, Geophys. J. Int., 166, 1318-1334.
43. Zoback, M.D. & Townend, J., 2001. Implications of hydrostatic pore pressures and high crustal strength for the deformation of intraplate lithosphere, Tectonophysics, 336(1-4), 19-30.