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International Journal of Earth Sciences

, Volume 96, Issue 6, pp 1033–1046 | Cite as

Lithospheric extension from rifting to continental breakup at magma-poor margins: rheology, serpentinisation and symmetry

  • T. J. RestonEmail author
  • M. Pérez-Gussinyé
Original Paper

Abstract

The symmetry or asymmetry of the process of continental breakup has been much debated over the last 20 years, with various authors proposing asymmetric simple shear models, others advocating more symmetric, pure shear models and some combinations of the two. The unroofing of vast expanses of sub-continental mantle at non-volcanic margins has led some authors to argue in favour of simple shear models, but supporting evidence is lacking. Subsidence evidence from conjugate margin pairs is equivocal, and the detailed crustal and lithospheric structure of such pairs not generally well enough known to draw firm conclusions. In the Porcupine Basin, where the final stages of break-up are preserved, the development of structural asymmetry is demonstrable, and apparently related to late stage coupling of the crust to the mantle following the complete embrittlement of the crust. This agrees with theoretical modelling results, which predict that asymmetric models can develop only on a lithospheric scale when the crust and mantle are tightly coupled. However, whether such asymmetry is maintained during continued exhumation of the mantle is unclear.

Keywords

Continental breakup Rifting Rift symmetry Rheological evolution Detachment faulting Serpentinisation 

Notes

Acknowledgments

I am indebted to long-term support for studies of the processes of continental breakup from the Deutsche Forschungsgemeinschaft through projects Re 873/1, /3, /6, /7, and /8, all of which have contributed to the results discussed here. Much of the work presented here was carried out in conjunction with PhD students and post-docs funded by these projects. Other colleagues contributed valuable discussions, especially Cesar Ranero and Dirk Klaeschen; John Hopper and an anonymous reviewer provided helpful reviews. Lastly I would like to thank the organisers of the GV/SGF meeting in Strasbourg, 2004, for the invitation to present this work.

References

  1. Bassi G (1995) Relative importance of strain rate and rheology for the mode of continental extension. Geophys J Int 122:195–210CrossRefGoogle Scholar
  2. Braun J, Beaumont C (1987) Styles of continental rifting from dynamical models of lithospheric extension. Mem Can Soc Petr Geol 12:241–258Google Scholar
  3. Braun J, Beaumont C (1989) Dynamical models of the role of crustal shear zones in asymmetric continental extension. Earth Planet Sci Lett 93:405–443CrossRefGoogle Scholar
  4. Buck WR (1991) Modes of continental extension. J Geophys Res 96:20161–20178Google Scholar
  5. Buck WR, Martinez F, Steckler M, Cochran J (1988) Thermal consequences of lithospheric extension: pure and simple. Tectonics 7:213–234Google Scholar
  6. Chalmers JA, Laursen KH (1995) Labrador Sea—the extent of continental and oceanic crust and the timing of the onset of seafloor spreading. Mar Petr Geol 12:205–217CrossRefGoogle Scholar
  7. Chalmers JA, Pulvertaft TCR (2001) Development of the continental margins of the Labrador Sea: a review. In: Wilson RCL, Whitmarsh RB, Taylor B, Froitzheim N (eds) Non-volcanic rifting of continental margins: a comparison of evidence from land and sea. Spec Publ Geol Soc (London) 187:77–105Google Scholar
  8. Chian D, Keen C, Reid I, Louden KE (1995) Evolution of nonvolcanic rifted margins of the Labrador Sea. Geology 23:589–592CrossRefGoogle Scholar
  9. Chian D, Louden KE, Minshull TA, Whitmarsh RB (1999) Deep structure of the ocean–continent transition in the southern Iberia abyssal plain from seismic refraction profiles; Ocean Drilling Program (Legs 149 and 173) transect. J Geophys Res 104:7443–7462CrossRefGoogle Scholar
  10. Davison I (1997) Wide and narrow margins of the Brazilian South Atlantic. J Geol Soc (London) 154:471–476Google Scholar
  11. Dean SM, Minshull TA, Whitmarsh RB, Louden KE (2000) Deep structure of the ocean–continent transition in the southern Iberia abyssal plain from seismic refraction profiles; the IAM-9 transect at 40 degrees 20′N. J Geophys Res 105:5859–5885CrossRefGoogle Scholar
  12. Dunbar JA, Sawyer DS (1989) How preexisting weaknesses control the style of continental breakup. J Geophys Res 94:7278–7292Google Scholar
  13. Funck T, Hopper JR, Larsen HC, Louden KE, Tucholke BE, Holbrook WS (2003) Crustal structure of the ocean–continent transition at Flemish Cap: seismic refraction results. J Geophys Res 108 (B11):Art No 2531Google Scholar
  14. Gibbs A (1987) Linked tectonics of the northern North Sea Basins. In: Beaumont C, Tankard A (eds) Sedimentary Basins and basin-forming mechanisms. Can Soc Petr Geol Mem 12:163–171Google Scholar
  15. Harry DL, Sawyer D (1992) A dynamic model of extension in the Baltimore Canyon Trough region. Tectonics 11:420–436CrossRefGoogle Scholar
  16. Hopper J, Buck WR (1996) The effect of lower crustal flow on continental extension and passive margin formation. J Geophys Res 101:20175–20194CrossRefGoogle Scholar
  17. Hopper JR, Dahl-Jensen T, Holbrook WS, Larsen HC, Lizarralde D, Korenaga J, Kent GM, Kelemen PB (2003) Structure of the SE Greenland margin from seismic reflection and refraction data: implications for nascent spreading center subsidence and asymmetric crustal accretion during North Atlantic opening. J Geophys Res 108 (B5):Art No 2269Google Scholar
  18. Hopper JR, Funck T, Tucholke BE, Larsen HC, Holbrook WS, Louden KE, Shillington D, Lau H (2004) Continental breakup and the onset of ultraslow seafloor spreading off Flemish Cap on the Newfoundland rifted margin. Geology 32:93–96CrossRefGoogle Scholar
  19. Huismans RS, Beaumont C (2002) Asymmetric lithospheric extension; the role of frictional plastic strain softening inferred from numerical experiments. Geology 30:211–214CrossRefGoogle Scholar
  20. Huismans RS, Beaumont C (2003) Symmetric and asymmetric lithospheric extension: relative effects of frictional-plastic and viscous strain softening. J Geophys Res 108 (B10):Art No 2496Google Scholar
  21. Klemperer S (1988) Crustal thinning and nature of extension in the northern North Sea from deep seismic reflection profiling. Tectonics 7:803–821Google Scholar
  22. Krawczyk CM, Reston TJ, Beslier MO, Boillot G (1996) Evidence for detachment tectonics on the Iberia Abyssal Plain margin. In: Whitmarsh R, Sawyer D, Klaus A (eds) Proc ODP, Scientific Results 149, Ocean Drilling Program, College Station, pp 603–615Google Scholar
  23. Kusznir N, Park RG (1987) The extensional strength of continental lithosphere: its dependence on geothermal gradient, and crustal composition and thickness. In: Coward MP, Dewey JF, Hancock PL (eds) Continental extensional tectonics Spec Publ Geol Soc (London) 28:35–52Google Scholar
  24. Latin D, White N (1990) Generating melt during lithospheric extension: pure shear vs simple shear. Geology 18:327–331CrossRefGoogle Scholar
  25. Le Pichon X, Sibuet JC (1981) Passive margins; a model of formation. J Geophys Res 86:3708–3720CrossRefGoogle Scholar
  26. Lister GS, Davis GA (1989) The origin of metamorphic core complexes and detachment faults formed during Tertiary continental extension in the northern Colorado River region, USA. J Struct Geol 11:65–94CrossRefGoogle Scholar
  27. Lister GS, Etheridge MA, Symonds PA (1991) Detachment models for the formation of passive continental margins. Tectonics 10:1038–1063Google Scholar
  28. Maillard A, Malod J, Thiébot E, Klingelhoefer F, Réhault J-P (2006) Imaging a lithospheric detachment at the continent–ocean crustal transition off Morocco. Earth Planet Sci Lett 241:686–698CrossRefGoogle Scholar
  29. Manatschal G (2004) New models for evolution of magma-poor rifted margin based on a review of data and concepts from West Iberia and the Alps. Int J Earth Sci 93:432–466CrossRefGoogle Scholar
  30. Manatschal G, Froitzheim N, Rubenach M, Turrin BD (2001) The role of detachment faulting in the formation of an ocean–continent transition: insights from the Iberia Abyssal Plain. In: Wilson RCL, Whitmarsh RB, Taylor B, Froitzheim N (eds) Non-volcanic rifting of continental margins: a comparison of evidence from land and sea. Spec Publ Geol Soc (London) 187:405–428Google Scholar
  31. McKenzie DP (1978) Some remarks on the development of sedimentary basins. Earth Planet Sci Lett 40:25–32CrossRefGoogle Scholar
  32. Pérez-Gussinyé M, Reston TJ (2001) Rheological evolution during extension at passive non-volcanic margins: onset of serpentinization and development of detachments to continental break-up. J Geophys Res 106:3691–3975CrossRefGoogle Scholar
  33. Pérez-Gussinyé M, Reston TJ, Phipps Morgan J (2001) Rheological and magmatic evolution during extension at passive non-volcanic margins: the effect of initial lithospheric structure. In: Wilson RCL, Whitmarsh RB, Taylor B, Froitzheim N (eds) Non-volcanic rifting of continental margins: a comparison of evidence from land and sea. Spec Publ Geol Soc (London) 187:551–576Google Scholar
  34. Pérez-Gussinyé M, Ranero CR, Reston TJ, Sawyer, D (2003) Structure and mechanisms of extension at the Galicia Interior Basin, west of Iberia. J Geophys Res 108. doi: 101029/2001JB000901
  35. Pérez-Gussinyé M, Phipps Morgan J, Reston TJ, Ranero CR (2006) The rift to drift transition at non-volcanic margins: insights from numerical modelling. Earth Planet Sci Lett 244:458–473CrossRefGoogle Scholar
  36. Pickup S, Whitmarsh RB, Fowler CMR, Reston TJ (1996) Insight into the nature of the ocean–continent transition off West Iberia from a deep multichannel seismic reflection profile. Geology 24:1079–1082CrossRefGoogle Scholar
  37. Reston TJ (1988) Evidence for shear zones in the lower crust offshore Britain. Tectonics 7:929–945Google Scholar
  38. Reston TJ (1990) Mantle shear zones and the evolution of the North Sea Basin. Geology 18:272–275CrossRefGoogle Scholar
  39. Reston TJ (1993) Evidence for extensional shear zones in the mantle offshore Britain, and their implications for the extension of the continental lithosphere. Tectonics 12:492–506Google Scholar
  40. Reston TJ (2005) Polyphase faulting during the development of the west Galicia rifted margin. Earth Planet Sci Lett 237:561–576CrossRefGoogle Scholar
  41. Reston TJ (2006) The formation of the non-volcanic rifted margins by the progressive extension of the lithosphere: the example of the West Iberian margin. IMEDL Workshop volume. Columbia University Press, Columbia (in press)Google Scholar
  42. Reston TJ, Krawczyk CM, Klaeschen D (1996) The S reflector west of Galicia: Evidence from prestack depth migration for detachment faulting during continental breakup. J Geophys Res 101:8075–8091CrossRefGoogle Scholar
  43. Reston TJ, Pennell J, Stubenrauch A, Walker I, Pérez-Gussinyé M (2001) Detachment faulting, mantle serpentinization and serpentinite mud volcanism beneath the Porcupine Basin SW Ireland. Geology 29:587–590CrossRefGoogle Scholar
  44. Reston TJ, Gaw V, Pennell J, Klaeschen D, Stubenrauch A, Walker I (2004) Extreme crustal thinning in the south Porcupine Basin and the nature of the Porcupine median high: implications for the formation of non-volcanic rifted margins. J Geol Soc (London) 161:783–798Google Scholar
  45. Sibuet JC (1992) New constraints on the formation of the nonvolcanic continental Galicia–Flemish cap conjugate margins. J Geol Soc (London) 149:829–840Google Scholar
  46. Srivastava S, Roest W (1999) Extent of oceanic crust in the Labrador Sea. Mar Petrol Geol 16:65–84CrossRefGoogle Scholar
  47. Tucholke BE, Sibuet J-C, Klaus A et al (2004) Proc ODP, Init Repts, 210 (Online), http://www.odptamuedu/publications/210_IR/210irhtm
  48. Voorhoeve H, Houseman G (1988) The thermal evolution of lithosphere extending on a low-angle detachment zone. Basin Res 1:1–9Google Scholar
  49. Wernicke B (1981) Low-angle normal faults in the Basin and Range Province: Nappe tectonics in an extending orogen. Nature 291:645–648CrossRefGoogle Scholar
  50. Wernicke B (1985) Uniform-sense normal simple shear of the continental lithosphere. Can J Earth Sci 22:331–339CrossRefGoogle Scholar
  51. White N (1989) Nature of lithospheric extension in the North Sea. Geology 17:101–196Google Scholar
  52. White N, McKenzie DP (1988) Formation of the “steer’s head” geometry of sedimentary basins by differential stretching of the crust and mantle. Geology 16:250–253CrossRefGoogle Scholar
  53. Whitmarsh RB, Miles P (1995) Models of the development of West Iberia rifted continental margin at 40 degrees 30’N deduced from surface and deep-tow magnetic anomalies. J Geophys Res 100:3789–3806CrossRefGoogle Scholar
  54. Whitmarsh RB et al (1998) Drilling reveals transition from continental breakup to early magmatic crust. Eos Trans Am Geophys Union 79:173–181Google Scholar
  55. Whitmarsh RB, Dean SM, Minshull TA, Tompkins M (2000) Tectonic implications of exposure of lower continental crust beneath the Iberia Abyssal Plain, Northeast Atlantic Ocean: geophysical evidence. Tectonics 19:919–942CrossRefGoogle Scholar
  56. Whitmarsh RB, Manatschal G, Minshull TA (2001) Evolution of magma-poor continental margins from rifting to seafloor spreading. Nature 413:150–154CrossRefGoogle Scholar
  57. Zelt CA, Sain K, Naumenko JV, Sawyer DS (2003) Assessment of crustal velocity models using seismic refraction and reflection tomography. Geophys J Int, 153:609–626CrossRefGoogle Scholar
  58. Ziegler PA, Cloetingh S (2004) Dynamic processes controlling evolution of rifted basins. Earth Sci Rev 64:1–50CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.IFM-GEOMARKielGermany
  2. 2.School of Geography, Earth and Environmental SciencesUniversity of BirminghamBirminghamUK
  3. 3.Institute of Earth Sciences Jaume AlmeraCSICBarcelonaSpain

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