Allochthonous Sequences

  • A. Ribeiro
  • E. Pereira
  • R. Dias
  • J. I. Gil Ibarguchi
  • R. Arenas
Part of the IGCP-Project 233 book series (IGCP 233)

Abstract

The NW segment of the Iberian Peninsula is characterized by the emplacement of a pile of thrust sheets on top of the Autochthon of the Central-Iberian Zone. A traverse along the coastal section in Galicia and Asturias shows a consistent vergence to the E in the different tectonic units, implying that the nappes come from W. But a traverse along the present southern limit of the nappe system, located along the right bank of the Douro River, shows a more complex structure (Fig. 1). We will describe below the structure of the autochthon and allochthon, the mechanism of emplacement and probable root zone of each nappe, and we will refer briefly to the tectonic evolution after nappe buildup.

Keywords

Zircon Recrystallization Magnetite Hematite Bedding 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Anthonioz PM (1972) Les complexes polymétamorphiques précambriens de Morais et Bragança (NE du Portugal): étude pétrographique et structurale. Mem Sery Geol Port 20: 192Google Scholar
  2. Arenas R, Gil Ibarguchi J, Gonzalez Lodeiro F, Klein E, Martinez Catalan JR, Ortega Girones E, Pablo Macia JG, Peinado M (1986) Tectonostratigraphic units in the complexes with mafic and related rocks of the NW of the Iberian Massif. Hercynica II, 2: 87–110Google Scholar
  3. Burchfiel BC, Royden LH (1985) North-south extension within the convergent Himalayan region. Geology (Boulder) 13: 679–682CrossRefGoogle Scholar
  4. Burg JP, Iglesias M, Laurent P, Matte P, Ribeiro A (1981) Variscan intracontinental deformation. The Coimbra-Cordoba shear zone (SW Iberian Peninsula). Tectonophysics 78: 161–177CrossRefGoogle Scholar
  5. Butler R (1982) The terminology of structures in thrust belts. J Struct Geol 4 (3): 239–245CrossRefGoogle Scholar
  6. Dias R (1986) Estudo de um sector do autoctone de Tras-osMontes oriental a ENE de Torre de Moncorvo. M. Sci Thesis, Lisbon University, 153 pGoogle Scholar
  7. Dias R, Ribeiro A (in press) Finite strain analysis in a trans-pression regime (Variscan autochthon, NE Portugal). Submitted to Tectonophysics and Abstract to Conference on Plate Tectonics and Deformation, Oviedo, 1987Google Scholar
  8. Fanas P, Gallastegui G, Gonzalez Lodeiro F, Marquinez J, Martini Parra LM, Martinez Catalan JR, Pablo Macia JG de, Rodriguez Fernandez LR (in press) Aportaciones al conocimiento de la litoestratigrafia y estructura de Galicia Central. An Fac Cienc PortoGoogle Scholar
  9. Ferreira MRP (1964) Geologia e Petrologia da regiäo de Rebordelo-Vinhais. Mem Not Mus Lab Min Geol Univ Coimbra 58: 292 ppGoogle Scholar
  10. Floor P (1966) Petrology of an aegirine-riebeckite gneiss-bearing part of the Hesperian Massif: the Galineiro and surrounding areas Vigo, Spain. Leidse Geol Meded 36: 1–203Google Scholar
  11. Gil Ibarguchi JI, Ortega Girones E (1985) Petrology, structure and geotectonic implications of glaucophane-bearing eclogites and related rocks from the Malpica-Tuy (MT) Unit, Galicia, northwest Spain. Chem Geol 50: 145–162CrossRefGoogle Scholar
  12. Iglesias M, Ribeiro A (1981) Zones de cisaillement ductile dans l’arc ibéro-armoricain. Comun Sery Geol Port 67 (1): 85–87Google Scholar
  13. Iglesias M, Ribeiro ML, Ribeiro A (1983) La interpretation aloctonista de la estrutura del Noroeste Peninsular. Geol Esp Inst Geol Min Esp Madr 1: 459–467Google Scholar
  14. Julivert M, Fontboté JM, Ribeiro A, Conde L (1974) Memo-ria Explicativa. Mapa Tectonico de la Peninsula Ibérica y Baleares, esc. 1:1000 000. Inst Geol Min Esp, pp 1–113Google Scholar
  15. Kuijper RP, Arps CES (1983) Los complejos de Ordenes, Lalin y Forcarey. Geol Esp 1: 422–430Google Scholar
  16. Lefort JP, Ribeiro A (1980) La Faille de Porto-Badajoz-Cordove a-t-elle controlée l’évolution de l’ocean paléozoique sud-armoricain? Bull Soc Géol Fr (7 Sér.), 22 (3): 455–462Google Scholar
  17. Marcos A, Marquinez J, Pérez Estann A, Pulgar JA, Bastida F (1984) Nuevas aportaciones al conocimento de la evo- lucion tectonometamorfica del Complejo de Cabo Ortegal (NW de Espana). Cuad Lab Xeol Laxe 7: 125–137Google Scholar
  18. Martinez Catalan JR, Klein E, Pablo Macia JG de, Gonzalez Lodeiro F (1984) El Complejo de Ordenes: Subdivision y discusion sobre su origen. Cuad Lab Xeol Laxe 7: 139–210Google Scholar
  19. Matte P, Capdevilla R (1978) Tectonique en grands plis couchés et plissements superposés d’âge hercynien dans la série de Ordenes-Betanzos (Galice Occidentale). Cuad Semin Estud Ceram Sargadelos 27: 193–201Google Scholar
  20. Munha J, Marques F (1987) A model for the Lower Continental Crust (Morais and Bragança Massifs, NE Portugal): II Petrology. Terra Cognita 7 (2–3): 161Google Scholar
  21. Munha JM, Ribeiro A, Ribeiro ML (1984) Blueschistes in the Iberian Variscan chain (Tras-os-Montes: NE Portugal). Comun Sery Geol Port 70 (1): 31–53Google Scholar
  22. Munha J, Oliveira JT, Ribeira A, Oliveira V, Quesada C, Kerrich R (1986) Beja-Acebuches ophiolite: characterization and geodynamic significance. Maleo, Bol Inf. Soc Geol Port 2 (13): 31Google Scholar
  23. Pereira E (1987) Estudo geologico-estrutural da area de Celorico de Basto e sua interpretaçâo geodinâmica. PhD Thesis, Lisbon Univ, 274 pGoogle Scholar
  24. Pérez Estaan A, Bastida F, Alonso JL et al. (1987) The Cantabrian Zone: an interpretation for an arcuate foreland thrust belt. Conf Deformation and plate tectonics, Abstr, Oviedo, p 92Google Scholar
  25. Ramsay JG, Huber M (1987) The techniques of modern structural geology, vol 2. Folds and fractures. Academic Press, London, 700 ppGoogle Scholar
  26. Ribeiro A (1974) Contribution à l’étude tectonique de Trasos-Montes oriental. Mem Sery Geol Port 24 (Nova Série): 177Google Scholar
  27. Ribeiro A (1983) Los Complejos de Bragança y Morais. Geol Esp 1: 450–458Google Scholar
  28. Ribeiro A, Pereira E (1986) Flake tectonics in the NW Iberia Variscides. Maleo, Bol Inf Soc Geol Port 2 (13): 38Google Scholar
  29. Ribeiro A, Iglesias M, Ribeiro ML, Pereira E (1983) Modéle Géodynamique des Hercynides Ibériques. Comun Sery Geol Port 69 (2): 291–293Google Scholar
  30. Ribeiro A, Quesada C, Dallmeyer D (1987) Tectonostratigraphic terranes and the geodynamic evolution of the Iberian Variscan Fold Belt. Conf Deformation and plate tectonics, Abstr, Oviedo, pp 60–61Google Scholar
  31. Ribeiro ML (1976) Consideraçôes sobre uma ocorréncia de crossite em Tras-os-Montes oriental. Mem Not Mus Lab Mineral Geol Univ Coimbra 82: 1–16Google Scholar
  32. Ribeiro ML (1986) Geologia e Petrologia da regiäo a SW de Macedo de Cavaleiros (Tras-os-Montes oriental). PhD Thesis, Lisbon University, 202 ppGoogle Scholar
  33. Ribeiro ML (1987) Petrogenesis of early Paleozoic peralkaline rhyolites from the Macedo de Cavaleiros region (NE Potugal). Geol Rundschau 76/1: 147–168CrossRefGoogle Scholar
  34. Sanderson JD, Marchini WRD (1984) Transpression. J Struct Geol 6 (5): 449–458CrossRefGoogle Scholar
  35. Schermerhorn LJG, Kotsch S (1984) First occurrence of lawsonite in Portugal and tectonic implications. Comun Sery Geol Port 70 fasc. 1: 23–29Google Scholar
  36. Vogel DE, Engels JP, Tex E den (1983) El Complejo de Cabo Ortegal. Geol Esp 1: 440–449Google Scholar
  37. Anthonioz PM (1972) Les complexes polymétamorphiques Precambriens de Morais et Bragança (NE du Portugal): étude pétrographique et structurale. Mem Sery Geol Port 20: 1–112Google Scholar
  38. Arenas R (in press) Opposite P, T, t paths of Hercynian metamorphism between the upper units of the Cabo Ortegal Complex and their substratum (NW of the Iberian Massif). TectonophysicsGoogle Scholar
  39. Arenas R (1985) Evoluci6n petrol6gica y geoquimica de la unidad albctona inferior del complejo metam6rfico basicoultrabasico de Cabo Ortega] (Unidad de Moeche) y del SiInrico paraautactono, Cadena Hercinica Ibérica (NW de Espana). Thesis, Univ Complutense Madr 543 ppGoogle Scholar
  40. Arenas R, Peinado M (1984) Petrologia de las granulitas de alta presian y de las eclogitas de tipo B del Macizo de Cabo Ortegal, Galicia, NW de Espana. I Congr Esp Geol 2: 27–48Google Scholar
  41. Arenas R, Gil Ibarguchi JI, Gonzalez Lodeiro F et al. (1986) Tectonostratigraphic units in the complexes with mafic and related rocks of the NW of the Iberian Massif. Hercynica II, 2: 87–110Google Scholar
  42. Austrheim H (1987) Eclogitization of lower crustal granulites by fluid migration through shear zones. Earth Planet Sci Lett 81: 221–232CrossRefGoogle Scholar
  43. Austrheim H, Griffin WL (1985) Shear deformation and eclogite formation within granulite-facies anorthosites of the Bergen Arcs, western Norway. Chem Geol 50: 267–281CrossRefGoogle Scholar
  44. Bastida F, Marcos A, Marqu]nez J, Martinez Catalan JR, Pérez Estaün A, Pulgar JA (1984) Mapa geolagico de Espana, 1:200 000, Hoja n° 1 (La Coruna). IGME MadridGoogle Scholar
  45. Bastida F, Martinez Catalan JR, Pulgar A (1986) Structural, metamorphic and magmatic history of the Mondonedo Nappe (Hercynian belt, NW Spain). J Struct Geol 8, 3/4: 415–430CrossRefGoogle Scholar
  46. Bernard Griffiths J, Peucat JJ, Cornichet J, Iglesias Ponce de Leon M, Gil Ibarguchi JI (1985) U-Pb, Nd isotope and REE geochemistry in eclogites from the Cabo Ortegal Complex, Galicia, Spain: an example of REE inmobility conserving MORB-like patterns during high-grade metamorphism. Chem Geol (Isotope Geosci Sect) 52: 217–225CrossRefGoogle Scholar
  47. Calsteren PWC van, Boelrijk NAIM, Hebeda EH, Priem HNA, Tex E den, Verdurmen EATH, Verschure RH (1979) Isotopic dating of older elements (including the Cabo Oretal mafic-ultramafic complex) in the Hercynian Orogen of NW Spain: manifestations of a presumed Early Paleozoic mantle-plume. Chem Geol 24: 35–56CrossRefGoogle Scholar
  48. Capdevila R (1969) Le métamorphisme regional progressif et les granites dans le segment herycinien de Galice Nord-oriental (NW de l’Espagne). Thesis, Univ Montpellier, 430 ppGoogle Scholar
  49. Dallmeyer RD, Gil Ibarguchi JI (1990) Age of the amphibolitic metamorphism in the ophiolitic unit of Morais (North Portugal). Implications for the early stages of the Hercynian Orogenesis in the Iberian Massif. I Ged Soc London 147: 5Google Scholar
  50. Diaz Garcia F (1986) La Unidad de Agualada. Borde W del Complejo de Ordenes (NW de Espana). Trab Geol 16: 3–14Google Scholar
  51. Engels JP (1972) The catazonal poly-metamorphic rocks of Cabo Ortegal (NW Spain), a structural and petrofabric study. Leidse Geol Meded 48: 83–133Google Scholar
  52. Ernst WG (1973) Blueschist metamorphism and P-T regimes in active subduction zones. Tectonophysics 17: 255–272CrossRefGoogle Scholar
  53. Fanas P, Gallastegui G, Gonzalez Lodeiro F et al. (1987) Aportaciones al conocimiento de la litoestratigrafia y estructura de Galicia Central. Mem Fac Cienc Univ Porto 1: 411–431Google Scholar
  54. Franz G, Thomas S, Smith DC (1986) High-pressure phengite decomposition in the Weissenstein eclogite, Münchberger Gneiss Massif, Germany. Contrib Mineral Petrol 92: 71–85CrossRefGoogle Scholar
  55. Garcia Garzan J, Pablo Macia JG de, Llamas Borrajo JF (1981) Edades absolutas obtenidas mediante el método Rb-Sr de dos cuerpos de ortogneises en Galicia Occidental. Bol Geol Min Madr 92: 463–466Google Scholar
  56. Gil Ibarguchi JI, Ortega Girones E (1985) Petrology, structure and geotectonic implications of glaucophane-bearing eclogites and related rocks from the Malpica-Tuy Unit, Galicia, northwest Spain. Chem Geol 50: 145–162CrossRefGoogle Scholar
  57. Gil Ibarguchi JI, Abalos B, Campillo A et al. (1988) Asociaciones con granate-clinopiroxeno en la `unidad catazonal superior’ del complejo del Cabo Ortegal (NW Espana). Cuad Lab Xeol Laxe 12: 165–182Google Scholar
  58. Gil Ibarguchi JI, Mendia M, Girardean J, Pencat JJ (in press) Petrology of eclogites and clinopyroxene - garnet metabasites from the Cabo Ortegal Complex (northwestern Spain). Lithos (submitted)Google Scholar
  59. Green DH, Ringwood AE (1967) An experimental investigation of the gabbro to eclogite transformation and its petrological applications. Geochim Cosmochim Acta 31: 767–833CrossRefGoogle Scholar
  60. Holdaway MJ (1971) Stability of andalusite and the aluminum silicate phase diagram. Am J Sci 271: 97–131CrossRefGoogle Scholar
  61. Holland TJB (1980) The reaction albite = jadeite + quartz determined experimentally in the range 600–1200 °C. Am Min 65: 129–134Google Scholar
  62. Hubregtse JJMW (1973) Distribution of elements in some basic granulite-facies rocks. Konink Ned Akad, Amsterdam 27 (1): 68Google Scholar
  63. Iglesias M, Ribeiro ML, Ribeiro A (1983) La interpretacibn aloctonista de la estructura del Noroeste Peninsular. Geol Esp I (IGME Ed. Madr) 1: 459–467Google Scholar
  64. Kuijper RP (1979) U-Pb systematics and the petrogenetic evolution of infracrustal rocks in the Paleozoic basement of western Galicia (NW Spain). Thesis Univ Leiden, 101 ppGoogle Scholar
  65. Kuijper RP, Priem HNA, Tex E den (1982) Late Archaean-Early Proterozoic source ages of zircons in rocks from the Paleozoic Orogen of Western Galicia, NW Spain. Precambrian Res 19: 1–29CrossRefGoogle Scholar
  66. Liou JG (1971) P-T stability fields of laumontite, wairakite, lawsonite and related minerals in the system CaAI2Si208-SiO2–H2O. J Petrol 7: 221–245Google Scholar
  67. Maresch WV (1977) Experimental studies on glaucophane: an analysis of present knowledge. Tectonophysics 43: 109–125CrossRefGoogle Scholar
  68. Marquinez JL (1984) La Geologia del area esquistosa de Galicia Central (Cordillera Herciniana, NW de Espana). Mem Inst Geol Min Esp Madr 100: 231Google Scholar
  69. Munha J, Ribeiro A, Ribeiro ML (1984) Blueschists in the Iberian Variscan Chain (Tras-os-Montes: NE Portugal). Comun Sery Geol Port 70: 31–53Google Scholar
  70. Newton RC, Kennedy GC (1963) Some equilibrium reactions in the join CaAI2Si2O8–H20. J Geophys Res 68: 2967–2983CrossRefGoogle Scholar
  71. Nitsch KH (1971) Stabilititatsbezichungen von Prehnit und Pumpellyit-haltigen Paragenesen. Contrib Min Petrol 30: 240–260CrossRefGoogle Scholar
  72. Peucat JJ, Bernard Griffiths J, Dallmeyer RD, Gil Ibarguchi JI, Iglesias M, Menot P (1990) Geochemical and geochronological cross section of the deep Hercynian crust: the Cabo Ortegal high-pressure nappe (NW Spain). Tectonophysics 177: 263–292CrossRefGoogle Scholar
  73. Pin C, Peucat JJ (1986) Ages des épisodes de métamorphisme paléozoïques dans le Massif Central et le Massif Armoricain. Bull Soc Géol Fr 8, II, 3: 461–469Google Scholar
  74. Pin C, Vielzeuf D (1983) Granulites and related rocks in Variscan median Europe: a dualistic interpretation. Tectonophysics 93: 47–74CrossRefGoogle Scholar
  75. Platt JP (1986) Dynamics of orogenic wedges and the uplift of high-pressure metamorphic rocks. Geol Soc Am Bull 97: 1037–1053CrossRefGoogle Scholar
  76. Rao BB, Johannes W (1979) Further data on the stability of staurolite + quartz and related assemblages. Neues Jahrb Min Monatsh 437–447Google Scholar
  77. Ribeiro A, Pereira E, Marques F, Meirelles C (1987) A model for the lower continental crust (Morais and Bragança massifs, NE Portugal): I. Tectonics. Terra Cognita 7: 161Google Scholar
  78. Ries A, Shackleton RM (1971) Catazonal complexes of northwest Spain and north Portugal, remnants of a Hercynian thrust plate. Nat Phys Sci 234: 65–68Google Scholar
  79. Selverstone J (1985) Petrologic constraints on imbrication, metamorphism and uplift in the SW Tauern Window, eastern Alps. Tectonics 7: 687–704CrossRefGoogle Scholar
  80. Serrano Pinto MC, Gil Ibarguchi JI (1987) Revision de datos geocronologicos e isotopicos de granitoides hercinicos de la region Galaico-Castellana. Mem Fac Cienc Univ Porto 1:171–186Google Scholar
  81. Velde B (1967) Si’ content of natural phengites. Contrib Mineral Petrol 14: 250–258CrossRefGoogle Scholar
  82. Vielzeuf D (1984) Relations de phases dans le facies granulite et implications geodynamiques. L’exemple des granulites de Pyrenées vol 1. Thesis, University of Clermont-Ferrand, 288 ppGoogle Scholar
  83. Vogel DE (1967) Petrology of an eclogite and pyrigarnite bearing polymetamorphic rock complex at Cabo Ortegal, NW Spain. Leidse Geol Meded 40: 121–213Google Scholar
  84. Warnaars FW (1967) Petrography of a peridotite-amphibolite and gabbro-bearing polyorogenic terrain NW of Santiago de Compostela (Spain). Thesis, Univ Leiden, 208 ppGoogle Scholar
  85. Wegen G van der (1978) Garnet-bearing metabasites from the Blastomylonitic Graben, Western Galicia, Spain. Scr Geol Leiden 45: 1–95Google Scholar
  86. Winkler HGF (1976) Petrogenesis of metamorphic rocks (fourth edition). Springer, Berlin Heidelberg New York, 254 ppGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • A. Ribeiro
    • 1
    • 2
  • E. Pereira
    • 2
  • R. Dias
    • 1
  • J. I. Gil Ibarguchi
    • 3
  • R. Arenas
    • 4
  1. 1.Departamento de Geologia, Faculdade de CiênciasUniversidade de LisboaLisboaPortugal
  2. 2.Serviços Geológicos de PortugalPortugal
  3. 3.Departamento de Mineralogía y PetrologíaUniversidad del País VascoBilbaoSpain
  4. 4.Departamento de Petrología y Geoquímica, Facultad de Ciencias GeológicasUniversidad ComplutenseMadridSpain

Personalised recommendations