Item request has been placed! ×
Item request cannot be made. ×
loading  Processing Request

Deep-rooted “thick skinned” model for the High Atlas Mountains (Morocco). Implications for the seismic Eurasia-Africa plate boundary region ; Modelo de cabalgamiento profundo para el Alto Atlas (Marruecos). Implicaciones sísmicas en la zona de colisión entre Eurasia y Africa

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
اقرأ أكثر حفظ في قائمتي
  • معلومة اضافية
    • بيانات النشر:
      Consejo Superior de Investigaciones Científicas
    • الموضوع:
      2007
    • Collection:
      Estudios Geológicos (E-Journal)
    • نبذة مختصرة :
      Previous crustal models of the High Atlas suppose the existence of a mid-crustal detachment where all the surface thrusts merged and below which the lower crust was continuous. However, both seismic refraction data and gravity modeling detected a jump in crustal thickness between the High Atlas and the northern plains. Here we show that this rapid and vertical jump in the depth of Moho discontinuity suggests that a thrust fault may penetrate the lower crust and offset the Moho (deep-rooted “thick skinned” model). The distribution of Neogene and Quaternary volcanisms along and at the northern part of the High Atlas lineament can be related to the beginning of a partial continental subduction of the West African plate to the north underneath Moroccan microplate. Allowing from the complex problem of the plate boundary in the western zone of the Mediterranean, we propose to interpret the South-Atlasic fault zone as the actual northwestern boundary of the stable part of the African plate rather than the Azores-Gibraltar fault currently used. ; Los modelos geodinámicos existentes sobre la estructura profunda del alto Atlas suponen la existencia de un despegue medio-cortical donde convergen los cabalgamientos superficiales y bajo el cual la corteza inferior es continua. Los datos de sísmica de refracción y gravimetría, sin embargo, indican la existencia de una discontinuidad en el grosor de la corteza (profundidad del Moho) bajo el Alto Atlas. En este artículo ponemos de manifiesto que este salto rápido en la profundidad del Moho puede ser causado por un cabalgamiento que penetra la corteza inferior, desplazando la base de la misma (“deeprooted thick skinned model”). La distribución del volcanismo Neógeno y Cuaternario a lo largo de y al norte de la alineación del Alto Atlas pueden estar relacionados con el comienzo de una subducción continental parcial de la placa Africana occidental hacia el norte, bajo la microplaca marroquí. La expresión en superficie de este cabalgamiento, la zona de falla sud-atlásica, refleja la ...
    • File Description:
      application/pdf
    • Relation:
      https://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/188/188; Afrique, P. N. (2002). Anomalie de Bouguer, Afrique du Nord. Total Fina Elf, scale 1:4.000.000, 1 sheet, confidential.; Argus, D. F., Gordon, R.G., De Mets, C. & Stein, S. (1989). Closure of Africa-Eurasia-North America plate motion circuit and tectonics of the Gloria fault. J. Geophys. Res., 94: 5585-5602. doi:10.1029/JB094iB05p05585; Ayarza, P., Álvarez-Lobato, F., Teixell, A., Arboleya, M. L., Tesón, E., Julivert, M. & Charroud, M. (2005). Crustal structure under the central High Atlas Mountains (Morocco) from geological and gravity data. Tectonophysics, 400: 67-84. doi:10.1016/j.tecto.2005.02.009; Beauchamp, W., Barazangi, M., Demnati, A. & El Alji, M. (1996). Intracontinental rifting and inversion: The Missour bassin and Atlas Mountains of Morocco. A.A.P.G. Bulletin, 80: 1459-1482.; Beauchamp, W., Allmendinger, R. W., Barazangi, M., Demnati, A. & Dahmani, M. (1999). Inversion tectonics and evolution of the High Atlas Mountains, Morocco, based on a geological-geophysical transect. Tectonics, 18: 163-185. doi:10.1029/1998TC900015; Beaumont, C., Muñoz, J. A., Hamilton, J. & Fullsack, P. (2000). Factors controlling the Alpine evolution of the central Pyrenees inferred from a comparison of observations and geodynamical models. J. Geophys. Res., 105: 8121-8145. doi:10.1029/1999JB900390; Bernini, M., Boccaletti, M., Moratti, G. & Papani, G. (2000). Structural developement of the Taza-Guercif Basin as a constraint for the Middle Atlas Shear Zone tectonic evolution. Mar. Petrol. Geol., 17: 391-408. doi:10.1016/S0264-8172(99)00042-2; Berrahma, M. & Delaloye, M. (1989). Données géochronologiques nouvelles sur le massif volcanique du Siroua (Haut-Atlas, Maroc). J. Afr. Earth Sci., 9: 651-656. doi:10.1016/0899-5362(89)90049-3; Buforn, E., Sanz de Galdeano, C. & Udias, A. (1995). Seismotectonics of the Ibero-Maghrebian region. Tectonophysics, 228: 247-261. doi:10.1016/0040-1951(94)00276-F; Buforn, E., Bezzeghoud, M., Udias, A. & Pro, C. (2004). Seismic Sources on the Iberia-African Plate Boundary and their Tectonic Implications. Pure Appl. Geophys., 161: 623-646. doi:10.1007/s00024-003-2466-1; Cherkaoui, T. E. (1991). Contribution à l’étude de l’aléa sismique au Maroc. Ph.D. Thesis, Université de Grenoble, 246 p.; Chorowicz, J., Emran, A. & Alem, E. M. (2001). Tectonique et venues volcaniques en contexte de collision, exemple du massif néogène du Siroua (Atlas Marocain): effets combinés d’une transformante et de la suture panafricaine. Can. J. Earth Sci., 38: 411-425. doi:10.1139/cjes-38-3-411; Dewey, J., Pitman, W. C., Ryan, W. B. F. & Bonnin, J. (1973). Plate tectonics and the evolution of the Alpine system. Geol. Soc. Amer. Bull., 84: 3137-3180. doi:10.1130/0016-7606(1973)842.0.CO;2; Dewey, J. F., Helman, M. L., Turco, E., Hutton, D. W. H. & Knott, S. D. (1989). Kinematics of the western Mediterranean. In: Alpine tectonics (M. P. Coward, D. Dietrich and R. G. Park, ed.) Geol. Soc. London Special Pub., 45: 265-284.; El Harfi, A. (2001) Tectonic and sedimentary evolution of the South-Atlasic front (Central and Eastern High Atlas Mountains, Morocco) during Cenozoic times, Ouarzazate foreland basin. Ph.D. Thesis, Univ. Marrakech, 366 p.; El Harfi, A., Lang, J., Salomon, J. & Chellai, E. H. (2001). Cenozoic Sedimentary dynamics of the Ouarzazate Foreland Basin (Central High Atlas Mountains, Morocco). Int. J. Earth Sci. (Geol. Rundsch.), 90: 393-411.; El Harfi, A., Guiraud, M. & Lang, J. (2006). Deep-rooted “thick skinned” model for the High Atlas Mountains (Morocco). Implications for the structural inheritance of the southern Tethys passive margin. J. Structural Geol., 28: 1958-1976 doi:10.1016/j.jsg.2006.08.011; Ennih, N. & Liégeois, J. P. (2001). The Moroccan Anti- Atlas: the West African craton passive margin with limited Pan-African activity. Implications for the northern limit of the craton. Precambrian Res., 112: 289-302. doi:10.1016/S0301-9268(01)00195-4; Errarhaoui, K. (1998). Structure du Haut-Atlas: plis et chevauchements du socle et de couverture, interpretations des données géophysiques et géologiques. Ph.D. Thesis, Univ. Paris, 328 p.; Giese, P. & Jacobshagen, V. H. (1992). Inversion tectonics of intracontinental ranges: High and Middle Atlas, Morocco. Geol. Rundsch., 81: 249-259. doi:10.1007/BF01764553; Gomez, F., Allmendinger, R. W., Barazangi, M., Er Raji, A. & Dahmani, M. (1998). Crustal shortening and vertical strain partitioning in the Middle Atlas Mountains of Morocco. Tectonics, 17: 520-533. doi:10.1029/98TC01439; Gomez, F., Beauchamp, W. & Barazangi, M. (2000). Role of the Atlas Mountains (northwest Africa) within the African-Eurasian plate-boundary zone. Geology, 28: 775-778. doi:10.1130/0091-7613(2000)282.0.CO;2; Harmand, C. & Cantagrel, J. M. (1984). Le volcanisme alcalin Tertiaire et Quaternaire du Maroc: chronologie K-Ar et cadre géodynamique. J. Afr. Earth Sci., 2: 51-55. doi:10.1016/0899-5362(84)90019-8; Hatzfeld, D. & Frogneux, M. (1981). Intermediate depth seismicity in the western Mediterranean unrelated to subduction of oceanic lithosphere. Nature, 292: 443-445. doi:10.1038/292443a0; Ibhi, A. (2000). Le volcanisme Plio-quaternaire de Saghro (Haut-Atlas central, Maroc) et les enclaves basiques et ultrabasiques associées. Ph.D. Thesis, Univ. Agadir, 359 p.; Jacobshagen, V. (1992). Major fracture zones of Morocco: The South Atlas and the Transalboran fault systems. Geol. Rundsch., 81: 185-197. doi:10.1007/BF01764548; Laville, E. (1985). Évolution sédimentaire, tectonique et magmatique du bassin jurassique du Haut-Atlas (Maroc): modèle en relais multiples de décrochements. PhD Thesis, Univ. Montpellier, 166 p.; Laville, E. & Piqué, A. (1991). La distension crustale atlantique et atlasique au Maroc au début du Mésozoïque: le rejeu des structures hercyniennes. Bull. Soc. Géol. France, 162: 1161-1171.; Makris, J., Demnati, A. & Klussmann, J. (1985). Deep seismic soundings in Morocco and a crust and upper mantle model deduced from seismic and gravity data. Ann. Geophysicae, 3: 369-380.; Marone, F., Van Der Meijde, M., Van Der Lee, S. & Giardini, D. (2003). Joint inversion of local, regional and teleseismic data for crustal thickness in the Eurasia-Africa plate boundary. Geophys. J. Int., 154: 499-514. doi:10.1046/j.1365-246X.2003.01973.x; Mattauer, M., Tapponier, P. & Proust, F. (1977). Sur les mécanismes de formation des chaînes intracontinentales. L’exemple des chaînes atlasiques du Maroc. Bull. Soc. géol. France, 7: 521-552.; Medina, F. & Cherkaoui, T. (1991). Focal mechanisms of the Atlas earthquakes, and tectonic implications. Geol. Rundsch., 80: 639-648. doi:10.1007/BF01803691; Michard, A., Chalouan, A., Feinberg, H. & Goffe, B., (2002). Montigny, R. How does the Alpine belt end between Spain and Morocco? Bull. Soc. Géol. France 173: 3-15. doi:10.2113/173.1.3; Morel, J. L., Zouine, E. M. & Poisson, A. (1993). Relation entre la subsidence des bassins moulouyens et la création des reliefs atlasiques (Maroc): un exemple d’inversion tectonique depuis le Néogène. Bull. Soc. Géol. France, 164: 79-91.; Morel, J. L., Zouine, E. M., Andrieux, J. & Faure- Muret, A. (2000). Déformations néogènes et quaternaries de la bordure nord haut atlasique (Maroc): rôle du socle et conséquences structurales. J. Afr. Earth Sci., 30: 119-131.; Munoz, J. A. (1992). Evolution of a continental collision belt: ECORS-Pyrenees crustal balanced crosssection. In: Thrust Tectonics (K.R. McClay), New York, 235-246.; Piqué, A. & Michard, A. (1989). Moroccan Hercynides: a synopsis. The Paleozoic sedimentary and tectonic evolution at the northern margin of West Africa. Amer. J. Sci., 289: 286-330.; Piqué, A., Dahmani, M., Jeannette, D. & Bahi, L. (1987). Permanence of structural lines in Morocco from Precambrian to present. J. Afr. Earth Sci., 6: 247-256. doi:10.1016/0899-5362(87)90066-2; Piqué, A., Aït Ouali, R., Amrhar, M., Charroud, M., Gourmelen, C., Laville, E., Rekhiss, F. & Tricart, P. (1998). Évolution structurale des domaines atlasiques du Maghreb au Méso-Cénozoïque; le rôle des structures héritées dans la déformation du domaine atlasique de l’Afrique du Nord. Bull. Soc. Géol. France, 169: 797-810.; Piqué, A., Tricart, P., Guiraud, R., Laville, E., Bouaziz, S., Amrhar, M. & Aït Ouali, R. (2002). The Mesosoic-Cenozoic Atlas belt (North Africa): an overview. Geodin. Acta, 15: 185-208. doi:10.1016/S0985-3111(02)01088-4; Qureshi, S. N. (1986). Crustal studies of Morocco from gravity and seismic data. Dissertation, Fachbereich Geowissenschaften, Univ Hamburg., 120 p.; Rod, E. (1962). Fault pattern, northwest corner of Sahara Shield. A.A.P.G. Bull., 46: 529-552.; Roure, F. & Choukroune, P. (1998). Contribution of the Ecors seismic data to the Pyrenean geology: crustal architecture and geodynamic evolution of the Pyrenees. Mém. Soc. Géol. France, 173: 37-52.; Russo, P. & Russo, L. (1934). Le grand accident sudatlasien. Bull. Soc. Géol. France, 4: 375-384.; Sandvol, E., Calvert, A. & Barazangui, M. (1998). Grid search modelling of receiver functions: implications for crustal structure in the Middle East and North Africa. J. Geophys. Res., 103: 26899-26917. doi:10.1029/98JB02238; Schwarz, G., Mehl, H. G., Ramdani, F. & Rath, V. (1992). Electrical resistivity structure of the eastern Moroccan Atlas System and its Tectonic implications. Geol. Rundsch., 81: 221-235. doi:10.1007/BF01764551; Seber, D., Barazangi, M., Ibenbrahim, A. & Demnati, A. (1996). Geophysical evidence for lithospheric delamination beneath the Alboran Sea and Rif-Betic mountains. Nature, 379: 785-790. doi:10.1038/379785a0; Sébrier, M., Siame, L., Zouine, M., Winter, T., Missenard, Y. & Leturmy, P. (2006). Active tectonics in the Moroccan High Atlas. C. R. Geoscience, 338: 65-79. doi:10.1016/j.crte.2005.12.001; Souriau, A. & Granet, M. (1995). A tomographic study of the lithosphere beneath the Pyrenees from local and teleseismic data. J. Geophys. Res., 100: 18117-18134. doi:10.1029/95JB01053; Tadili, B., Ramdani, M., Ben Sari, D., Chapochnikov, K. & Bellot, A. (1986). Structure de la croûte dans le Nord du Maroc. Ann. Geophysicae, 4: 99-104.; Thio, H. K., Song, X., Saikia, C. K., Helmberger, D. V. & Woods, B. B. (1999). Seismic source and structure estimation in the western Mediterranean using a sparse broadband network. J. Geophys. Res., 104: 845-861. doi:10.1029/98JB01498; Vacher, P. & Souriau, A. (2001). A 3D model of the Pyrenean deep structure based on gravity modelling, seismic images and petrological constraints. Geophys. J. Int., 145: 460-470 doi:10.1046/j.0956-540x.2001.01393.x; Van Den Bosch, J. W. H. (1971). Carte gravimétrique du Maroc au 1/500.000, Anomalie de Bouguer d = 2,67. Notes Mém. Serv. Géol. Maroc 21, 234 p.; Van der Meijde, M., Van der Lee, S. & Giardini, D. (2003). Crustal structure beneath broad-band seismic stations in the Mediterranean region. Geophys. Jour. Int., 152: 729-739. doi:10.1046/j.1365-246X.2003.01871.x; Vergés, J., Fernández, M. & Martínez, A. (2002). The Pyrenean orogen: pre- syn- and post-collisional evolution. In: Reconstruction of the evolution of the Alpine-Himalayan Orogen (G. Rosenbaum and G. S. Lister, ed.) J. Virt. Explorer, 8: 57-76.; Weijermars, R. (1987). A revision of the Eurasian- African plate boundary in the western Mediterranean. Geol. Rundsch., 76: 667-676. doi:10.1007/BF01821057; Wigger, P., Asch, G., Giese, P., Heinsohn, W. D., El Alami, S. O. & Ramdani, F. (1992). Crustal structure along a traverse across the Middle and High Atlas Mountains derived from seismic refraction studies. Geol. Rundsch., 81: 237-248. doi:10.1007/BF01764552; Zeyen, H., Ayarza, P., Fernández, M. & Rimi, A. (2005). Lithospheric structure under the western African-European plate boundary: a transect across the Atlas Mountains and the Gulf of Cadiz. Tectonics, 24; https://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/188
    • الرقم المعرف:
      10.3989/egeol.07631188
    • الدخول الالكتروني :
      https://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/188
      https://doi.org/10.3989/egeol.07631188
    • Rights:
      Derechos de autor 2007 Consejo Superior de Investigaciones Científicas (CSIC) ; https://creativecommons.org/licenses/by/4.0
    • الرقم المعرف:
      edsbas.1D01E400