Evidence of extensional metamorphism associated to Cretaceous rifting of the North-Maghrebian passive margin: The Tanger-Ketama Unit (External Rif, northern Morocco)
DOI:
https://doi.org/10.1344/105.000001843Keywords:
Low-grade extensional metamorphism, Illite crystallinity, Kübler index, Tanger-Ketama unit, External Rif, Northern MoroccoAbstract
The distribution pattern of diagenetic conditions to very low-grade metamorphism in the eastern Rif has been determined based on a study of clay-mineral assemblages and illite crystallinity of Mesozoic metapelites. Low-grade conditions were reached in marbles and also in the Beni-Malek serpentinites, as suggested by the mineral assemblages present in the marbles and antigorite growth in serpentinites. Previous thermochronological data are based on i) 40Ar/39Ar in amphiboles from greenschists, ii) K/Ar in white micas from metasandstones, and iii) fission tracks in apatites and zircons from metasandstones. These data indicate a Late Cretaceous age (80 Ma) for the very low- to low-grade metamorphism. We propose an evolutionary model for the Tanger-Ketama Unit consisting of a Lower Cretaceous sequence deposited in half-graben basins over an exhumed serpentinized mantle in a setting similar to the West Galician non-volcanic margin. The sediments underwent diagenesis to very low-grade metamorphism under relatively high heat flow in this extensional setting. Miocene contractional deformation of the Tanger-Ketama Unit resulted in a penetrative crenulation cleavage associated to asymmetric inclined folds. This crenulation developed, mostly by solution-transfer processes, without significant mineral growth. Miocene metamorphism reset the apatite fission-tracks, but metamorphic conditions were not high enough to reset either the K/Ar ages or the zircon fission tracks.
References
Andrieux, J., 1971. La structure du Rif Central, Notes du Service Géologique du Maroc, 235.
Asebriy, L., 1994. Evolution tectonique et métamorphique du Rif Central (Maroc): Définition du domaine subrifain, Doctoral Thesis. University of Rabat, Morocco, 248pp.
Asebriy, L., Azdimousa, A., Bourgois, J., 2003. Structure du Rif externe sur la trnsversale du Massif de Kétama. Travaux de l’Institut Scientifique, Rabat, Maroc, 21, 27-46.
Asebriy, L., Bourgois, J., De Luca, P., Butterlin, J., 1992. Importance d’une tectonique de distension Pliocène dans le Rif Central (Maroc): La nappe de Kétama existe-t-elle?. Jounal of African Earth Sciences, 15, 49-57.
Asebriy, L., De Luca, P., Bourgois, J.; Chotin, P., 1987. Resédimentation d’âge Sénonien dans le Rif Central (Maroc): Conséquences sur les divisions paléogeographiques et structurales de la chaîne. Journal of African Earth Sciences, 6, 9-17.
Azdimousa, A., Bourgois, J., Asebriy, L., Poupeau, G., Montigny, R., 2003. Histoire thermique et surrection du Rif externe et des nappes de flyschs associées (Nord Maroc), Travaux de l’Institut Scientifique, Rabat, 21, 15-26.
Azdimousa, A., Bourgois, J., Poupeau, G., Montigny, R., 1998. Histoire thermique du massif de Kétama (Maroc); sa place en Afrique du Nord et dans les cordillières Bétiques. Comptes Rendus de l’Académie des Sciences de Paris, 326, 847-853.
Azdimousa, A., Jabaloy, A., Asebriy, L., Booth-Rea, G., GonzálezLodeiro, F., Bourgois, J., 2007. Lithostratigraphy and structure of the Temsamane unit (Eastern external Rif, Morocco). Revista de la Sociedad Geológica de España, 20(3-4), 187-200.
Balanyá, J.C., García-Dueñas, V., 1987. Les directions structurales dans le Domaine d’Álboran de part et d’autre du L’Étroit de Gibraltar. Comptes Rendus de l’Académie des Sciences de Paris, 304 (Serie II), 929-932.
Barbero, L., López-Garrido, A.C., 2006. Mesozoic thermal history of the Prebetic continental margin (southern Spain): Constraints from apatite fission-track analysis. Tectonophysics, 422, 115-128.
Boillot, G., Froitzheim, N., 2001. Non-volcanic rifted margins, continental break-up and the onset of sea-floor spreading: Some outstanding questions. In: Wilson, R. C. L., Whitmarsh, R.B., Taylor, B., Froitzheim, N. (eds.) Non-Volcanic Rifting of Continental Margins: A Comparison of Evidence from Land and Sea. London Geological Society, 187 (Special Publications), 9-30.
Boillot, G., Malond, J., 1988. The north and north-west Spanish continental margin: a review. Revista de la Sociedad Geológica de España, 1, 295-317.
Boillot, G., Recq, M., Winterer, E.L., Meyer, A.W., Applegate, J., Baltuck, M., Bergen, J.A., Comas, M.C., Davies, T.A., Dunham, K., Evans, C.A., Girardeau, J., Goldberg, G., Haggerty, J., Jansa, L.F., Johnson, J.A., Kasahara, J., Loreau, J.P., Luna-Sierra, E., Moullade, M., Ogg, J., Sarti, M., Thurow, J., Williamson, M., 1987. Tectonic denudation of the upper mantle along passive margin: A model based on drilling results (Ocean Drilling Program Leg 103, Western Galicia Margin, Spain). Tectonophysics, 132, 335-342.
Bourgois, J., 1977. D’une étape géodynamique majeure dans la genèse de l’arc de Gibraltar: “L’hispanisation des flyschs rifains au Miocène inférieur”. Bulletin de la Société Géologique de la France, XIX, 115-1119.
Caballero, J. M., Casquet, C., González-Casado, J. M., Snelling, N., Tornos, F., 1992. Dating of hydrothermal events in the Sierra de Guadarrama, Iberian Hercynian Belt, Spain. Geogaceta, 11, 18-21.
Casas, A. M., Cortés, A. L., Maestro, A., 2000. Intra-plate deformation and basin formation in the northern Iberian plate: Origin and evolution of the Almazán Basin. Tectonics, 19, 258-289.
Chalouan, A., Michard, A., 2004. The Alpine Rif belt (Morocco): A case of mountain building in a subduction-subductiontransform fault triple junction. Pure and Applied Geophysics, 161(3), 489-519.
Chalouan, A., Michard, A., El Kadiri, Kh., Negro, F., Frizon de Lamotte, D., Soto, J. I., Saddiqi, O., 2008. Chapter 5. The Rif Belt. In: Michard, A., Saddiqi, O., Chalouan, A., Frizon de Lamotte, D. (eds.). Continental Evolution: The Geology of Morocco. Structure, Stratigraphy, and Tectonics of the AfricaAtlantic-Mediterranean Triple Junction. 116, Springer-Verlag Berlin Heidelberg, Lecture Notes in Earth Sciences, 203-302.
Choubert, G., Faure-Muret, A., Hilali, E. A., Houzay, J. P., Frizon de Lamotte, D., 1984. Carte géologique du Rif, échelle 1/50000, feuille Boudinar. Notes et Mémories du Service Géologique du Maroc, 299.
Ciszak, R., 1987. Resédimentation intrasénonienne du Trias évaporitique dans le sillon tellien (Algérie). Implications dans la tectogenèse des Maghrébides. Géologie Mediterranéenne XIV, 137-141.
Ciszak, R., Magne, J., Peybernes, B., 1986. Interprétation du complexe chaotique “triasique” d´Oraine (Algérie occidentale) comme un olistostrome sénonien localement réinjecté dans les accidents alpins. Comptes Rendus de l’Académie des Sciences de Paris, 402, 357-362.
Dewey, J. F., Helman, M. L., Turco, E., Hutton, D. H., Knot, S. D. 1989. Kinematics of the western Mediterranean. In: Coward, M.P., Dietrich, D., Park, R.G. (eds.). Conference on Alpine tectonics, 45, 265-283.
Discovery 215 Working Group, 1998. Deep structure in the vicinity of the ocean-continent transition zone under the southern Iberia Abyssal Plain. Geology 26, 743-746.
Durand-Delga, M., Hottinger, L., Marcais, J., Mattauer, M., Milliard, Y., Suter, G., 1962. Données actuelles sur la structure du Rif. Livre à la mémoire du professeur Fallot. Mémoires hors série, Paris, Société Géologique de la France, 1. 399-442.
Duran-Delga, M., Rossi, P., Olivier, P., Puglisi, D., 2000. Situation structurale et nature ophiolitique de roches basiques jurassiques associées aux flyschs maghrébins du Rif (Maroc) et de Sicile (Italie). Comptes Rendus de l’Académie des Sciences, de Paris, 331 (1, Series II), 29-38.
Elazzab, D., Galdeano, A., Feinberg, H., Michard, A., 1997. Prolongement en profondeur d’une écaille ultrabasique allochtone: traitement des donnéees aéromagnétiques et modélisation 3D des péridotites des Beni Malek (Rif, Maroc). Bulletin de la Société Géologique de la France, 168, 667-683.
Fabriés, J., Lorand, J. P., Bodinier, J.L., 1998. Petrogenetic evolution of orogenic lherzolite massifs in the central and western Pyrenees. Tectonophysics, 292, 145-167. doi:10.1016/S0040-1951(98)00055-9
Faccenna, C., Piromallo, C., Crespo-Blanc, A., Jolivet, L., Rossetti, F., 2004. Lateral slab deformation and the origin of the western Mediterranean arcs. Tectonics, 23(TC1012). doi:10.1029/2002TC001488.
Féraud, G., Girardeau, J., Beslier, M. O., Boillot, G., 1988. Datation 39Ar/40Ar de la mise en place des péridotites bordant la marge de la Galice (Espagne). Comptes Rendus de l’Académie de Sciences de Paris, 307 (Series II), 49-55.
Frizon de Lamotte, D., 1985. La structure du Rif oriental (Maroc). Rôle de la tectonique longitudinale et importance des fluides. Mémoires des Sciences de la Terre, University Paul et Marie Curie, Paris VI. Doctoral Thesis.
Goldberg, J. M., Leyreloup, A. F., 1990. High temperature-low pressure Cretaceous metamorphism related to crustal thinning (eastern north Pyrenean zone, France). Contributions to Mineralogy and Petrology, 104, 194–207. doi: 10.1007/BF00306443
Goldberg, J. M., Guiraud, M., Malusky, H., Séguret, M., 1988. Caractères pétrologiques et âge du métamorphisme en context distensif du basin sur décrochement de Soria (Crétacé inférieur, Nord Espagne). Comptes Rendus de l´Académie des Sciences de Paris, 307, 521-527.
Goldberg, J.M., Maluski, H., Leyreloup, A.F., 1986. Petrological and age relationship between emplacement of magmatic breccia, alkaline magmatisme, and static metamorphism in the North Pyrenean Zone. Tectonophysics, 129, 275-290.
Gübeli, A., Hochuli, P. A., Wildi, W., 1984. Lower Cretaceous turbiditic sediment from the Rif chain (northern Morocco), palynology, stratigraphy setting. Geologisches Rundschau, 73, 1081-1114.
Guidotti, C. V., Sassi, F. P., 1986. Classification and correlation of metamorphic facies series by means of muscovite b0 data from low-grade metapelites. Neues Jahrbuch fur Mineralogie, Abhandlungen, 153, 363-380.
Harmand, C. H., Asebriy, L., De Luca, P., 1988. Un témoin de l’évolution géodynamique du Rif central (Maroc) au cours du Mésozoïque: l’intrusion alcaline de Bou Adel. ClermontFerrand, 11ème Réunion des Sciences de la Terre, Société Géologique de la France.
Hölker, A., Holliger, K., Manatschal, G., Anselmetti, F., 2002. Seismic structure of the Iberian and Tethyan distal continental margins based on geological and petrophysical data. Tectonophysics, 350, 127-156.
Jabaloy, A., Booth-Rea, G., Azdimousa, A., Asebriy, L., Vázquez, M., Martínez-Martínez, J. M., Gabites, J., 2012. 40Ar/39Ar constraints on the activity of the Temsamane extensional detachment (eastern Rif, Morocco). Geophysical Research Abstracts, 14, EGU2012-7792.
Jabaloy, A, Galindo-Zaldívar, J., González-Lodeiro, F., 2002. Palaeostress evolution of the Iberian Peninsula (Late Carboniferous to present-day). Tectonophysics, 357, 159-186.
Jolivet, L., Faccenna, C., Goffé, B., Burov, E., Agard, P., 2003. Subduction tectonics and exhumation of high-pressure metamorphic rocks in the Mediterranean orogens. American Journal of Science, 303, 353-409.
Juez-Larré, J., Ter Voorde, M., 2009. Thermal impact of the break-up of Pangea on the Iberian Peninsula, assessed by thermochronological dating and numerical modeling. Tectonophysics, 474, 200–213, doi: 10.1016/j.tecto.2009.01.024
Kisch, H. J., 1991. Illite ‘crystallinity’: Recommendations on sample preparation, X-ray diffraction settings and interlaboratory samples. Journal of Metamorphic Geology, 9, 665-670.
Kisch, H. J., Arcai, P., Brime, C., 2004. On the calibration of the illite Kübler index (illite crystallinity). Schweizerische Mineralogische und Petrographische Mitteilungen, 84, 323-331.
Kretz, R., 1983. Symbols for rock-forming minerals. American Mineralogist, 68, 277-279.
Kuhnt, W., Obert, D., 1991. Evolution crétacée de la marge tellienne. Bulletin de la Sociéte Géologique de la France, 162, 515-522.
Lagabrielle, Y., Bodinier, J. L., 2008. Submarine reworking of exhumed subcontinental mantle rocks: Field evidence from the Lherz peridotites, French Pyrenees. Terra Nova, 20(1), 11-21, doi: 10.1111/j.1365-3121.2007.00781.x
Lagabrielle, Y., Labaume, P., de Saint Blanquat, M., 2010. Mantle exhumation, crustal denudation, and gravity tectonics during Cretaceous rifting in the Pyrenean realm (SW Europe): Insights from the geological setting of the lherzolite bodies. Tectonics, 29, TC4012. doi: 10.1029/2009TC002588
Leblanc, D., 1975-1979. Etude géologique du Rif externe oriental au Nord de Taza (Maroc). Notes et Mémoires du Service Géologique du Maroc, 281.
Leikine, M., Asebriy, L., Bourgois, J., 1991. Sur l’âge du métamorphisme anchiépizonal de l’unité de Kétama, Rif central (Maroc). Comptes Rendus de l’Académie des Sciences de Paris, 313,787-793.
Lespinasse, P., 1975. Géologie des zones externes et des flyschs entre Chaouen et Zoumi (Centre de la chaîne rifaine, Maroc). Doctoral Thesis, Université Paul et Marie Curie, Paris VI.
Manatschal, G., Engström, A., Desmur, L., Schaltegger, U., Cosca, M., Muentener, O., Bernoulli, D., 2006. What is the tectono-metamorphic evolution of continental break-up: The example of the Tasna Ocean-Continent Transition. Journal of Structural Geology, 28, 1849-1869.
Martín-González, F., Capote, R., Barbero, L., Insua, J. M., Martínez-Díaz, J. J., 2006. Primeros resultados de huellas de fisión en apatito en el sector Lugo-Ancares (Noroeste de la Península Ibérica). Geogaceta, 40, 79-82.
Massonne, H. J., Schereyer, W., 1987. Phengite geobarometry based on the limiting assemblage with K-feldspar, phlogopite and quartz. Contributions to Mineralogy and Petrology, 96, 212-224.
Massonne, H.J., Szpurka Z., 1997. Thermodynamic properties of white micas on the basis of high-pressure experiments in the systems K2O-MgO-Al2O3-SiO2-H2O and K2O-FeO-Al2O3-SiO2-H2O. Lithos, 41, 229-250.
Mata, M. P., Casas, A. M., Canals, A., Gil, A., Pocovi, A., 2001. Thermal history during Mesozoic extension and Tertiary uplift in the Cameros basin, northern Spain. Basin Research, 13, 91-11.
Merriman, R. J., 2005. Clay minerals and sedimentary basin history. European Journal of Mineralogy, 17, 7-20.
Merriman, R.J., Frey, M., 1999. Patterns of very low-grade metamorphism in metapelitic rocks. In: Frey, M., Robinson, D. (eds.). Low-grade metamorphism. Oxford, Blackwell Science, 61-107
Merriman, R.J., Peacor, D.R., 1999. Very low-grade metapelites: mineralogy, microfabrics and measuring reaction progress. In: Frey, M., Robinson, D. (eds.). Low-grade metamorphism. Oxford, Blackwell Science, 10-60.
Merriman, R.J., Roberts, B., 1985. A survey of white mica crystallinity and polytypes in pelitic rocks of Snowdonia and Llyn, N. Wales. Mineralogical Magazine, 49, 305-319.
Michard, A., Feinberg, H., El-Azzab, D., Bouybaouène, M., Saddiqi, O., 1992. A Serpentinite ridge in a collisional paleomargin
setting: The Beni Malek Massif, external Rif, Morocco. Earth and Planetary Science Letters, 113(3), 425-442.
Michard, A., Frizon de Lamotte, D., Negro, F., Saddiqui, O., 2007. Serpentinite slives and metamorphism in the external Maghrebides: Arguments for an intracontinental suture in the African paleomargin (Morocco, Algeria). Revista de la Sociedad Geológica de España, 20, 173-185.
Michard, A., Negro, F., Saddiqi, O., Bouybaouène, M. L., Chalouan, A., Montigny, R., 2006. Pressure-temperature-time constraints on the Maghrebide mountain building: Evidence from the Rif-Betic transect (Morocco), Algerian correlations, and geodynamic implications. Comptes Rendus Géoscience, 338(1-2), 92-114.
Monié, P., Frizon de Lamotte, D., Leikine, M., 1984. Etude géochronologique préliminaire par la méthode 39Ar/40Ar du métamorphisme alpin dans le Rif externe (Maroc); précisions sur le calendrier tectonique tertiaire. Revue de Géologie Dynamique et de Géographie Physique, 25(4), 307-317.
Montigny, R., Azambre, B., Rossy, M., Thuizat, R., 1986. K-Ar study of Cretaceous magmatism and metamorphism in the Pyrenees: Age and length of rotation of the Iberian Peninsula. Tectonophysics, 129, 257-273, doi:10.1016/0040-1951(86)90255-6
Nieto, F., Mata, P., Bauluz, B., Giorgetti, G., Árkai, P., Peacor, D. R., 2005. Retrograde diagenesis, a wide spread process on a regional scale. Clay Minerals, 40, 93-104.
Negro, F., 2005. Exhumation des roches métamorphiques du Domaine d’Alborán: étude de la chaîne rifaine et corrélation avec les Cordillères Bétiques. Doctoral Thesis. Paris, Université Paris XI, France, 91pp.
Negro, F., Agard, P., Goffé, B., Saddiqi, O., 2007. Tectonic and metamorphic evolution of the Temsamane units, External Rif (northern Morocco): Implications for the evolution of the Rif and the Betic-Rif arc. London, Journal of the Geological Society, 164, 829-842.
Negro, F., de Sigoyer, J., Goffé B., Saddiqi, O., Villa, I. M., 2008. Tectonic evolution of the Betic–Rif arc: New constraints from 40Ar/39Ar dating on white micas in the Temsamane units (External Rif, northern Morocco). Lithos, 106, 93-108. doi:10.1016/j.lithos.2008.06.011
Pérez-Gussinyé, M., Reston, T. J., 2001. Rheological evolution during extension at nonvolcanic rifted margins: Onset of serpentinization and development of detachments leading to continental breakup. Journal of Geophysical Research, 106(B3), 3, 961-963, 975.
Reston, T. J., Krawczyk, C. M., Klaeschen, D., 1996. The S reflector west of Galicia: Evidence from prestack depth migration for detachment faulting during continental breakup. Journal of Geophysical Research, 101, 8075-8091.
Ribeiro Da Costa, I., Barriga, F., Viti, C., Mellini, M., Wicks, F. J., 2008. Antigorite in deformed serpentinites from the MidAtlantic Ridge. European Journal of Mineralogy, 20, 563-572.
Roberts, B., Merriman, R. J., 1985. The distinction between Caledonian burial and regional metamorphism in metapelites from North Wales: An analysis of isocryst pattern, Journal of the Geological Society, London, 142, 625-624.
Robinson, D., 1987. Transition from diagenesis to metamorphism in extensional and collision settings. Geology, 15, 866-869.
Robinson, D., Bevins, R.E., 1986. Incipient metamorphism in the Lower Palaeozoic marginal basin of Wales. Journal of Metamorphic Geology, 4, 101-113.
Robinson, D., Bevins, R. E., 1989. Diastathermal (extensional) metamorphism at very low grades and possible high grade analogues. Earth and Planetary Science Letters, 92, 81-88.
Sassi, F. P., Scolari, A., 1974. The b0 value of the potassic white mica in low-grade metamorphism rocks. An application to eastern Alps. Tschermaks Mineralogische und Petrographische Mitteilungen, 18, 105-113.
Schärer, U., Kornprobst, J., Beslier, M. O., Boillot, G., Girardeau. J., 1995. Gabbro and related rock emplacement beneath rifting continental crust: U–Pb geochronological and geochemical constraints for the Galicia passive margin (Spain). Earth and Planetary Science Letters, 130, 187-200.
Stapel, G., 1999. The nature of isostasy in western Iberia. Doctoral thesis, Vrije Universiteit, Amsterdam.
Sutter, G., 1980. Carte structurale de la chaîne rifaine à 1/500000. Notes et Mémoires du Service Géologique du Maroc.
Terrinha, P., Rocha, R., Rey, J., Cachão, M., Moura, D., Roque, C., Martins, L., Valadares, V., Cabral, J., Azevedo, M.R., Barbero, L., Clavijo, E., Dias, R.PO., Gafeira, J., Matias, H., Matias, L., Madeira, J., Marques da Silva, C., Munhá, J., Rebêlo, L., Ribeiro, C, Vicente, J., Youbi, N., 2006. A Bacia do Algarve: Estratigrafia, Paleogeografia e Tectónica. In: Dias, R., Araújo, A., Terrinha, P., Kullberg (eds.). Geologia de Portugal no contexto da Ibéria (Universitdade de Évora, Portugal), 247-316.
Vidal, J.F., 1971. Une interprétation nouvelle des nappes du Prérif central (Maroc) et ses conséquences sur la structure de leur substratum autochtone. Comptes Rendus de l’Académie des Sciences de Paris, 272, 24-27.
Warr, L. N., Rice, A. H. N., 1994. Interlaboratory standardization and calibration of clay mineral crystallinity and crystallite size data. Journal of Metamorphic Geology, 12, 141–152.
Wilson, R. C., Whitmarsh, R. B., Froitzheim, N., Taylor, B., 2001. Introduction: the land and sea approach. In: Wilson, R. C., Whitmarsh, R. B., Taylor, B., Froitzheim, N. (eds.). Non-Volcanic Rifting of Continental Margins: A Comparison of Evidence from Land and Sea. Geological Society, London, Special Publications, 187, 1-8. doi:10.1144/GSL.SP.2001.232.01.28
Yilmaz, P. O., Norton, I. O., Leary, D., Chuchla, R. J., 1996. Tectonic evolution and paleogeography of Europe. In: Ziegler, P.A., Horvàth, F. (eds.). Peri-thetis Memoir 2: Structure and Prospects of Alpine Basins and Forelands. Muséum National d’Histoire Naturelle, Paris (France), Publications Scientifiques, 47-60.
Zhang, Y. K., 1993. The thermal blanketing effect of sediments on the rate and amount of subsidence in sedimentary basins formed by extension. Tectonophysics, 218(4), 297-308.
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