The S reflector west of Galicia (Spain): Evidence from prestack depth migration for detachment faulting during continental breakup

Journal of Geophysical Research: Solid Earth

Volumn 101, Issue 4, 1996, Pages 8075-8091

  Reston, T J ^a,c   Krawczyk, C M ^a,b   Klaeschen, D ^a,c  

^a GEOMAR HELMHOLTZ CENTRE FOR OCEAN RESEARCH KIEL   (Germany)

^b GFZ GERMAN RESEARCH CENTRE FOR GEOSCIENCES   (Germany)

^c UNIVERSITY OF KIEL   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

CONTINENTAL BREAKUP; DETACHMENT FAULT; DETACHMENT FAULTING; EXTENSION; FAULTS; PRESTACK DEPTH MIGRATION; RIFTED MARGIN; S REFLECTOR;

ATLANTIC, GALCIAI BANKS; ATLANTIC, GALICIA MARGIN;

EID: 0029751370     PISSN: 21699313     EISSN: 21699356     Source Type: Journal    
DOI: 10.1029/95jb03466     Document Type: Article

References (34)

1. Abers, G., Possible seismogenic shallow-dipping normal faults in the Woodlark-D'Entrecasteaux extensional province, Papua New Guinea, Geology, 19, 1205-1208, 1991.
2. Axen, G., Pore pressure, stress increase and fault weakening in low-angle normal faulting, J. Geophys. Res., 97, 8979-8991, 1992.
3. Boillot, G., and E. Winterer, Drilling on the Galicia margin: Retrospect and prospect, Proc. Ocean Drill. Program Sci. Results, 103, 809-828, 1988.
4. Boillot, G., J. Girardeau, and J. Kornprobst, The rifting of the Galicia margin: crustal thinning and emplacement of mantle rocks on the seafloor, Proc. Ocean Drill. Program Sci. Results, 103, 741-756, 1988a.
5. Boillot, G., M. Comas, J. Girardeau, J. Kornprobst, J. P. Loreau, J. Malod, D. Mougenot, and M. Moullade, Preliminary results of the Galinaute cruise: Dives of the submersible Nautile on the western Galicia margin, Spain, Proc. Ocean Drill. Program Sci. Results, 103, 37-51, 1988b.
6. Boillot, G., G. Féraud, M. Recq, and J. Girardeau, "Undercrusting" by serpentinite beneath rifted margins: the example of the west Galicia margin (Spain), Nature, 341, 523-525, 1989.
7. Buck, W. R., Flexural rotation of normal faults, Tectonics, 7, 959-973, 1988.
8. de Charpal, O., P. Guennoc, L. Montadert, and D. Roberts, Rifting, crustal attenuation and subsidence in the Bay of Biscay, Nature, 275, 706-711, 1978.
9. Denelle, E., Y. Dezard, and J. Raoult, 2-D prestack depth migration in the (S-G-W) domain, paper presented at 56th Meeting, Soc. of Explor. Geophys., Houston, Tex., 1986.
10. Gans, P., An open system, two-layer crustal stretching model for the eastern Great Basin, Tectonics, 6, 1-12, 1987.
11. Goodwin, E., G. Thompson, and D. Okaya, Seismic identification of basement reflectors: The Bagdad Reflection Sequence in the Basin and Range Province-Colorado Transition Zone, Arizona, Tectonics, 8, 821-831, 1989.
12. Hoffmann, H.J., and T. J. Reston, The nature of the S reflector beneath the Galicia Bank rifted margin: Preliminary results from pre-stack depth migration, Geology, 20, 1091-1094, 1992.
13. Horsefield, S., Crustal structure across the continent-ocean boundary. PhD thesis, 215 pp., Cambridge Univ., Cambridge, United Kingdom, 1992.
14. Hubral, P., Time migration: some ray theoretical aspects, Geophys. Prospect., 25, 738-745, 1977.
15. Jackson, J., Active normal faulting and crustal extension, Geol, Soc. Lindon Spec. Publ., 28, 3-17, 1987.
16. Juhlin, C., Interpretation of the reflections in the Siljan Ring area based on results from Gravberg-1 borehole, Tectonophysics, 173, 345-360, 1990.
17. Krawczyk, C. M., and T. J. Reston, Detachment faulting and contintenal breakup: the S reflector offshore Galicia, Rifted Ocean-Continent Boundaries, NATO ASI Ser C, vol. 463, edited by E. Banda et al., pp. 231-246, Kluwer Acad., Norwell, Mass., 1995.
18. Kusznir, N., and R. G. Park, The extensional strength of the lithosphere: Its dependence on geothermal gradient, and crustal composition and thickness, Geol Soc. London, Spec. Publ. 28, 35-52, 1987.
19. Le Pichon, X., and F. Barbier, Passive margin formation by low-angle faulting within the upper crust: The northern Bay of Biscay margin, Tectonics, 6, 133-150, 1987.
20. Lister, G.S., and G. A. Davis, The origin of metamorphic core complexes and detachment faults formed during Tertiary continental extension in the northern Colorado River region, U.S.A., J. Struct. Geol., 11, 65-94, 1989.
21. Lister, G. S., M. Etheridge, and P. Symonds, Detachment models for the formation of passive continental margins, Tectonics, 10, 1038-1064, 1991.
22. Marrett, R., and R. Allmendinger, Amount of extension on "small" faults: an example from the Viking graben, Geology, 20, 47-50, 1992.
23. Mauffret, A., and L. Montadert, Rift tectonics on the passive continental margin off Galicia (Spain), Mar. Pet. Geol., 40, 49-70, 1987.
24. Meissner, R., and J. Strehlau, Limits of stresses in the continental crust and their relationship to the depth-frequency distribution of shallow earthquakes, Tectonics, 1, 73-89, 1982.
25. Moullade, M., M.-F. Brunet, and G. Boillot, Subsidence and deepening of the Galicia Margin: The paleoenvironmental control, Proc. Ocean Drill. Program, Sci. Results, 103, 733-740, 1988.
26. Reston, T.J., C. M. Krawczyk, and H.-J. Hoffmann. Detachment tectonics during Atlantic rifting: analysis and interpretation of the S reflector, west Galicia margin, Geol. Soc. London, Spec. Publ., 90, 93-109, 1995.
27. Sherwood, J., Depth sections and interval velocities from surface seismic data, Leading Edge, 8-9, 44-49, 1989.
28. Sibuet, J. C., New constraints on the formation of the non-volcanic continental Galicia- Flemish Cap conjugate margins, J. Geol. Soc. London, 149, 829-840, 1992.
29. Sibuet, J. C., V. Louvel, R. Whitmarsh, R. White, S. Horsefield, B. Sichler, and M. Recq, Constraints on rifting processes from refraction and deep-tow magnetic data: the example of the Galicia continental margin (west Iberia). Rifted Ocean-Continent Boundaries, NATO ASI Ser C, vol. 463, edited by E. Banda et al., pp. 231-246, Kluwer Acad., Norwell, Mass., 1995.
30. Thommeret, M., G. Boillot, and J. Sibuet, Structural map of the Galicia margin, Proc. Ocean Drill. Program, Sci. Results, 103, 31-36, 1988.
31. Wernicke, B., Low angle normal faults in the Basin and Range: Nappe tectonics in an extending orogen, Nature, 291, 645-648, 1981.
32. Wernicke, B., and G. Axen, On the role of isostasy in the evolution of normal fault systems. Geology, 16, 848-851, 1988.
33. Winterer, E., J. Gee, and R. van Waasbergen, The source area for lower Cretaceous clastic sediments of the Galicia margin: Geology and tectonic and erosional history, Proc. Ocean Drill. Program, Sci. Results, 103, 697-732, 1988.
34. Yin, A., Origin of regional rooted low-angle normal faults: A mechanical model and its tectonic implications, Tectonics, 8, 469-482, 1989.