Evolution of a continental collision belt: ECORS-Pyrenees crustal balanced cross-section

  • Josep Anton Muñoz

Abstract

Construction of a crustal balanced cross-section across the Pyrenean chain shows a minimum shortening of 147 km, 112 km of which are related to stacking of basement thrust sheets in the southern Pyrenees. Metamorphic conditions of the basement rocks, as well as thrust geometry, indicate the maximum depth for the detachment level to be at 15 km. In the restored cross-section, the upper crust is 110 km longer than the lower layered crust. The lower crust was subducted together with the lithospheric mantle into the asthenospheric mantle and has not been imaged by geophysical data probably because an increase of density through eclogitic meta-morphism. The upper crust constitutes an orogenic lid mainly deformed by thrust structures. The balanced cross-section has been constrained by the ECORS deep reflection seismic profile as well as detailed surface data and available commercial seismic and oil well data. The restored cross-section provides a better picture of the middle Cretaceous combined strike-slip and extensional fault system as well as of the Hercynian crust. Hercynian geological features have been used as an additional tool for the restoration of the basement thrust sheets.

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References

  1. Baby, P., Crouzet, G., Specht, M., Deramond, J., Bilotte, M. O., Debroas, E. J. 1988. Rôle des paléostructures albo-cénomaniennes dans la géométrie des chavauchements frontaux nord-pyrénéens. Comptes Rendus de l’Académie des Sciences, Paris, 306, 307–313.Google Scholar
  2. Banda, E., Suriñach, E., Aparicio, A., Sierra, J. & Ruiz de la Parte, E. 1981. Crust and upper mantle structure of the central Iberian Meseta (Spain). Geophysical Journal of the Royal Astronomical Society, 67, 779–789.CrossRefGoogle Scholar
  3. Banda, E., Suriñach, E., Aparicio, A., Sierra, J. & Berastegui, X. 1990. Seismic fabrics in deep seismic profiles. In: Pinet, B. et al., (eds), The potential of deep seismic profiling for hydrocarbon exploration. Éditions Technip, Paris, 73–76.Google Scholar
  4. Banks, C. J. & Warburton, J. 1986. ‘Passive-roof’ duplex geometry in the frontal structures of the Kirthar and Sulaiman mountain belts, Pakistan. Journal Structural Geology, 8, 229–237.CrossRefGoogle Scholar
  5. Bates, M. 1989. Palaeomagnetic evidence for rotations and deformation in the Nogueras Zone, Central Southern Pyrenees. Journal of the Geological Society, London, 146, 459–476.CrossRefGoogle Scholar
  6. Bayer, R., Cazes, M., Dal Piaz, G. V., Damotte, B., Elter, J., Gosso, G., Hirn, A., Lauza, R., Lombardo, B., Mugnier, J. L., Nicolas, A., Nicolich, R., Polino, R., Roure, F., Sacachi, R., Scarascia, S., Tabacco, I., Tapponnier, P., Tardy, M., Taylor, M., Thouvenot, F., Torreilles, G. & Villien, A. 1987. Premiers résultats de la traversée des Alpes occidentales par sismique reflexion verticale (Programme ECORS-CROP). Comptes Rendus de l’Académie des Sciences, Paris, 305, 1461–1470.Google Scholar
  7. Beach, A. 1981. Thrust tectonics and crustal shortening in the external French Alps based on a seismic cross-section. Tectonophysics, 79, T1–T6.CrossRefGoogle Scholar
  8. Berastegui, X., Garcia, J. M. & Losantos, M. 1990. Structure and sedimentary evolution of the Organyà basin (Central South Pyrenean Unit, Spain) during the Lower Cretaceous. Bulletin de la Société Géologique de France, 8, 251–264.Google Scholar
  9. Boilot, G. 1986. Comparison between the Galicia and Aquitaine margins. Tectonophysics 129, 243–255.CrossRefGoogle Scholar
  10. Boilot, G & Capdevila, R. 1977. The Pyrenees, subduction and collision ? Earth and Planetary Science Letters, 35, 251–260.Google Scholar
  11. Boilot, G & Malod, J. 1988. The north and north-west Spanish continental margin: a review. Revista Sociedad Geológica, España, 1, 295–316.Google Scholar
  12. Bons, A.-J. 1989. Very low-grade metamorphism of the Seo Formation in the Orri Dome, South-Central Pyrenees. Geologie en Mijnbouw, 68, 303–312.Google Scholar
  13. Burbank, D. W., Vergés, J., Muñoz, J. A. & Bentham, P. 1991. Coeval hindward- and forward-imbricating thrusting in the Central Southern Pyrenees, Spain, Timing and rates of shortening and deposition. Geological Society of America Bulletin (in press)Google Scholar
  14. Butler, R.W.H. 1986. Thrust tectonics, deep structure and crustal subduction in the Alps and Himalayas. Journal of the Geological Society, London, 143, 857–873.CrossRefGoogle Scholar
  15. Butler, R.W.H. 1990. Balancing sections on a crustal scale: a view from the western Alps. Proceedings of the European Geotraverse Sixth workshop, 157–164.Google Scholar
  16. Butler, R.W.H. & Coward, M. P. 1989. Crustal scale thrusting and continental during Himalayan collision tectonics on the NW Indian plate. In: Sengör, A.M.C. (ed.), Tectonic Evolution of the Tethyan Region. NATO ASI, series C: Mathematical and Physical Sciences, 259, 387–413.CrossRefGoogle Scholar
  17. Casas, J. M. & Poblet, J. 1989. Essai de restitution de la déformation dans une zone avec plis et chevauchaments, le ‘synclinal de Llavorsi’ dans le Pyrénées centrales (Espagne). Comptes Rendus de l’Académie des Sciences, Paris, 308, 427–433.Google Scholar
  18. Cámara, P. & Klimowitz, J. 1985. Interpretatión geodinámica de la vertiente centro-occidental surpirenaica. Estudios Geológicos, 41, 391–404.CrossRefGoogle Scholar
  19. Cheadle, M. J., McGeary, S., Warner, M. R. & Matthews, D. H. 1987. Extensional structures on the western UK continental shelf, a review of evidence from deep seismic profiling. In: Coward, M. P., Dewey, J. & Hancock, P. L. (eds) Continental Extensional Tectonics. Geological Society of London Special Publication, 28, 445–465.Google Scholar
  20. Chopin, C. 1984. Coesite and pure pyrope in high-grade blueschists of the Western Alps, a first record and some consequences. Contributions to Mineralogy and Petrology, 86, 197–218.CrossRefGoogle Scholar
  21. Chopin, C. 1987. Very-high-pressure metamorphism in the western Alps, implications for subduction of continental crust. Philosophical Transactions of the Royal Society of London, series A, 321, 183–197.CrossRefGoogle Scholar
  22. Choukroune, P. 1976. Structure et évolution tectonique de la zone nord-pyrénéenne (analise de la déformation dans une portion de chaîne à schistosité subverticale). Mémoires de la Société Géologique de France, 127, 116p.Google Scholar
  23. Choukroune, P., Seguret, M. & Galdeano, A. 1973. Caractéristiques et évolution structurale des Pyrénées. Bulletin de la Société Géologique de France, 7, 601–611.Google Scholar
  24. Choukroune, P. & ECORS Team. 1989. The ECORS Pyrenean deep seismic profile reflection data and the overall structure of an orogenic belt. Tectonics, 8, 23–39.CrossRefGoogle Scholar
  25. Choukroune, P., Pinet, B., Roure, F. & Cazes, M. 1990. Major Hercynian structures along the ECORS Pyrenees and Biscaye Lines. Bulletin de la Société Géologique de France, 8, VI, 313–320.Google Scholar
  26. Dahlstrom, C.D. A. 1969. Balanced cross sections. Canadian Journal Earth Sciences, 6, 743–757.CrossRefGoogle Scholar
  27. Daignières, M., Gallart, J., Banda, E. & Hirn, A. 1982. Implications of the seismic structure for the orogenic evolution of the Pyrenean Range. Earth and Planetary Science Letters, 57, 88–100.CrossRefGoogle Scholar
  28. Dalloni, M. 1913. Stratigraphie et tectonique de la région des Nogueras (Pyrénées centrales). Bulletin de la Société Géologique de France, 4, 243–263.Google Scholar
  29. Dalloni, M. 1930. Étude géologique des Pyrénées Catalanes. Annales Facultee Sciences Marseille, XXVI, 373pp.Google Scholar
  30. Debroas, E-J. 1987. Modèle de bassin triangulaire à l’intersection de décrochements divergents pour le fossé albo-cénomanien de la Ballongue (zone nord-pyrénéenne, France). Bulletin de la Société Géologique de France, 8, 887–898.Google Scholar
  31. Debroas, E-J. 1990. Le Flysch noir albo-cénomanien témoin de la structuration albienne à sénonienne de la zone nord-pyrénéenne en Bigorre (Hautes Pyrénées, France). Bulletin de la Société Géologique de France, 8, 273–285.Google Scholar
  32. Deramond, J., Graham, R., H. Hossack, J. R. Baby, P. Crouzet, & Crouzet, G. 1985. Nouveau modéle de la chaîne des Pyrénées. Comptes Rendus de l’Académie des Sciences, Paris, 301, 1213–1216.Google Scholar
  33. Deramond, J., Baby, P., Specht, M. & Crouzet, G. 1990. Géométrie des chevauchements dans la zone nord-pyrénéenne ariégoise précisée par le profil ECORS. Bulletin de la Société Géologique de France, 8, 287–294.Google Scholar
  34. Dinares, J., McClelland, E. & Santanach, P. 1991. Contrasting rotations within thrust sheets and kinematics of thrust-tectonics as derived from palaeomagnetic data: an example from the southern Pyrenees (this volume).Google Scholar
  35. Duée, G., Lagabrielle, Y., Coutelle, A. & Fortané, A. 1984. Les lherzolites associées aux chaînons béarnais (Pyrénées occidentales): mise à l’affleurement anté-dogger et resédimentation albo-cénomanienne Comptes Rendus de l’Académie des Sciences, Paris, 299, 1205–1210.Google Scholar
  36. ECORS Pyrenees team. 1988. The ECORS deep reflection seismic survey across the Pyrenees. Nature, 331, 508–511.CrossRefGoogle Scholar
  37. Farrell, S. G., Williams, G. D. & Atkinson, C. D. 1987. Constraints on the age of movement of the Montsech and Cotiella Thrusts, south central Pyrenees, Spain. Journal of the Geological Society of London, 144, 907–914.CrossRefGoogle Scholar
  38. Fischer, M. W. 1984. Thrust tectonics in the North Pyrenees. Journal of Structural Geology, 6, 721–726.CrossRefGoogle Scholar
  39. Garrido-Megías, A. & Ríos, L.M. 1972. Síntesis geológica del Secundaric y Terciario entre los ríos Cinca y Segre (Pirineo central de la vertiente surpirenaica, provincias de Huescay Lérida). Boletin Geológicoy Miner c de España, 83, 1–47.Google Scholar
  40. Goldberg, J. M. & Maluski, H. 1988. Données nouvelles et mise au point sur l’âge du métamorphisme pyrénéen. Comptes Rendus de l’Académie des Sciences, Paris, 306, 429–435.Google Scholar
  41. Grimaud, S., Boulot, G., Collette, B. J., Mauffret, A., Miles, P. R. & Roberts D. B. 1982. Western extension of the Iberian-European plate boundar) during the Early Cenozoic (Pyrenean) convergence, a new model Marine Geology, 45, 63–77.CrossRefGoogle Scholar
  42. Hossack, J. R. 1979. The use of balanced cross-sections in the calculation of orogenic contraction: A review. Journal of the Geological Society of London, 136, 705–711.CrossRefGoogle Scholar
  43. Laubscher, H. 1988. Material balance in Alpine orogeny. Geological Society of America Bulletin, 100, 1313–1328.CrossRefGoogle Scholar
  44. Laubscher, H. P. 1990. Seismic data and the structure of the central Alps Proceedings of the European Geotraverse Sixth workshop, 149–156.Google Scholar
  45. Le Pichon, X. & Barbier, F. 1987. Passive margin formation by low-angle faulting within the upper crust, The Northern Bay of Biscay margin Tectonics, 6, 133–150.CrossRefGoogle Scholar
  46. Martínez, M. B. & Pocoví, J. 1988. El amortiguamiento frontal de le estructura de la cobertera surpirenaica y su relación con el anticlinal de Barbastro - Balaguer. Acta Geológica Hispànica, 23, 81–94.Google Scholar
  47. Mattauer, M. 1985. Présentation d’un modèle lithosphérique de la chaîne des Pyrénées. Comptes Rendus de l’Académie des Sciences, Paris, 300, 71–74.Google Scholar
  48. Mattauer, M. 1986. Intracontinental subduction, crust-mantle décollement and crustal-stacking wedge in the Himalayas and other collision belts. In: Coward M. P. & Ries, A. C. (eds) Collision Tectonics. Geological Society of Londor Special Publication, 19, 37–50.Google Scholar
  49. Mattauer, M. 1990. Vue autre interprétation du profil ECORS Pyrénées. Bulletin dt la Société Géologique de France, VI, 307–311.Google Scholar
  50. McCaig, A. M. & Miller, J. A. 1986. 40Ar-39Ar age of mylonites along the Merens fault, Central Pyrenees. Tectonophysics, 129, 149–172.CrossRefGoogle Scholar
  51. McClelland, E. A. & McCaig, A. M. 1989. Palaeomagnetic estimates of rotation in basement thrust sheets, Axial Zone, Southern Pyrenees Cuadernos de Geologia Ibérica, 12, 181–193.Google Scholar
  52. Menard, G. & Thouvenot, F. 1987. Coupes équilibrées crustales, méthodologie et application aux Alpes occidentales. Geodinamica Acta, 1, 35–45.Google Scholar
  53. Montigny, R., Azambre, B., Rossy, M. & Thuizat, R. 1986. K-Ar study of Cretaceous magmatism and metamorphism from the Pyrenees: age and length of rotation of the Iberian peninsula. Tectonophysics, 129, 257–274CrossRefGoogle Scholar
  54. Mugnier, J. L., Guellec, S., Menard, G. Vialon, Roure, F., Tardy, M., & Vialon, P. 1990. Crustal balanced cross-section through the external Alps deducec from the ECORS profile. Bulletin de la Société Géologique de France (in press)Google Scholar
  55. Muñoz, J. A. 1985. Estructura alpina i herciniana a la vora sud de la zona axial del Pirineu oriental. Tesi doctoral. University of Barcelona, 305p.Google Scholar
  56. Muñoz, J. A., Puigdefabregas, C. & Fontboté, J. M. 1984. El ciclo alpino y h estructura teetönica del Pirineo. In: Comba, J. A., Libro Jubilar J. M Rios, Geología de Espana, 2. IGME, Madrid, 185–205.Google Scholar
  57. Muñoz, J. A., Martinez, A. & Vergés, J. 1986. Thrust sequences in the easterr Spanish Pyrenees. Journal of Structural Geology, 8, 399–405.CrossRefGoogle Scholar
  58. Mutti, E., Rosell, J., Allen, G. P., Fonnesu, F. & Sgavetti, M. 1985. The Eocene baronia tide dominated delta-shelf system in the Ager Basin. Exc. Guide-book 6th European Regional Meeting. Lerida, Spain, 579–600.Google Scholar
  59. Olivet, J. L., Bonnin, J., Beuzart, P. & Auzende, J. M. 1984. Cinematique de l’Atlantique nord et central. Centre National pour l’exploration des oceans, Rapports scientifiques et techniques, 54, 108p.Google Scholar
  60. Pocoví, J. 1978. Estudio geológico de las Sierras Marginales Catalanas (Prepirineo de Lérida). Acta Geológica Hispànica, 13, 73–79.Google Scholar
  61. Price, R. A. 1986. The southeastern Canadian Cordillera, thrust faulting tectonic wedging, and delamination of the lithosphere. Journal of Structual Goelogy, 8, 239–245CrossRefGoogle Scholar
  62. Roure, F., Choukroune, P., Berastegui, X., Munoz, J. A., Villien, A., Matheron, P., Bareyt, M., Seguret, M., Camara, P. & Deramond, J. 1989. ECORS Deep Seismic data and balanced cross-sections, geometric constraints to trace the evolution of the Pyrenees. Tectonics, 8, 41–50.CrossRefGoogle Scholar
  63. Schreyer, W. 1988. Subduction of Continental Crust to Mantle Depths, Petrological Evidence. Episodes, 11, 97–104.Google Scholar
  64. Seguret, M. 1972. Étude tectonique des nappes et séries décollées de la partie centrale du versant sud des Pyrénées. Publications de l’Université de Sciences et Techniques de Languedoc, série Geologie Structurale, n. 2, Montpellier.Google Scholar
  65. Seguret, M. & Daignières, M. 1986. Crustal scale balanced cross-sections of the Pyrenees, discussion. Tectonophysics, 129, 303–318.CrossRefGoogle Scholar
  66. Simó, A. & Puigdefabregas, C. 1985. Transition from shelf to basin on an active slope, upper Cretaceous, Tremp area, southern Pyrenees. Exc. Guide-book 6th European Regional Meeting, Lerida, Spain, 63–108.Google Scholar
  67. Souquet, P. 1967. Le Crétacé supérieur sud-pyreneen en Catalogne, Aragon et Navarre. Thèse Doctorat Sciences Naturales. Faculté Sciences Toulouse, 529p.Google Scholar
  68. Souquet, P. & Peybernés, B. 1987. Allochtonie des massifs primaires nord-pyrénéens des Pyrénées Centrales. Comptes Rendus de l’Académie des Sciences, Paris, 305, 733–739.Google Scholar
  69. Torne, M., De Cabissole, B., Bayer, R., Casas, A., Daignières, M. & Rivero, A. 1989. Gravity constraints on the deep structure of the Pyrenean belt along the ECORS profile. Tectonophysics, 165, 105–116.CrossRefGoogle Scholar
  70. Vergés, J. & Muñoz, J. A. 1990. Thrust sequences in the Southern Central Pyrenees. Bulletin de la Société Géologique de France, 8, 265–271.Google Scholar
  71. Vielzeuf, D. & Kornprobst, J. 1984. Crustal splitting and the emplacement of Pyrenean lherzolites and granulites. Earth and Planetary Science Letters, 67, 383–386.CrossRefGoogle Scholar
  72. Williams, G. D. & Fischer, M. W. 1984. A balanced section across the Pyrenean orogenic belt. Tectonics, 3, 773–780.CrossRefGoogle Scholar
  73. Zandvliet, J. 1960. The geology of the Upper Salat and Pallaresa valleys, Central Pyrenees, France/Spain. Leidse Geologische Mededelingen, 25, 1–27.Google Scholar
  74. Zwart, H. J. 1979. The geology of the Central Pyrenees. Leidse Geologische Mededelingen, 50, 1–44.Google Scholar
  75. Zwart, H. J. 1986. The Variscan Geology of the Pyrenees. Tectonophysics, 129, 9–27.CrossRefGoogle Scholar

Copyright information

© K.R. McClay 1992

Authors and Affiliations

  • Josep Anton Muñoz
    • 1
  1. 1.Departament de Geologia Dinàmica, Geofísica i Paleontologia, Facultat de GeologiaUniversitat de BarcelonaBarcelonaSpain

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