Late Variscan, Permo-Carboniferous, Al-K plutonism in the South Portuguese Zone: El Crispinejo cordierite-bearing granite.

Authors

  • A. DÍEZ MONTES nstituto Geológico y Minero de España, IGME C/ Azafranal, 48, 37001-Salamanca, Spain.
  • PABLO VALVERDE-VAQUERO Instituto Geológico y Minero de España, IGME C/ La Calera, 28760-Tres Cantos, Spain.
  • C. REY-MORAL Instituto Geológico y Minero de España, IGME C/ La Calera, 28760-Tres Cantos, Spain.
  • T. SÁNCHEZ-GARCÍA Instituto Geológico y Minero de España, IGME C/ Ríos Rosas, 23, 28003-Madrid, Spain.

DOI:

https://doi.org/10.1344/GeologicaActa2017.15.4.11

Keywords:

South Portuguese Zone, Iberian Pyrite Belt, El Crispinejo granite, Radiometric, U-Pb ID-TIMS geochronology.

Abstract

The El Crispinejo granite forms part of a small, but distinctive late intrusive suite of cordierite-bearing peraluminous granites in the South Portuguese Zone (SPZ). This granite has the best outcrop relationships of the suite. It cross-cuts different members of the Sierra Norte Batholith of the SPZ and the Carboniferous Volcano-Sedimentary Complex of the Iberian Pyrite Belt, producing contact metamorphism. This late pluton has a high K content which results in a contrasting geophysical response (K-Th-U) with respect to the surrounding trondhjemitic granitoids of the TTG suite of the Sierra Norte Batholith. A concordant monazite-zircon U-Pb ID-TIMS age of 300.5 +0.5/-1.5Ma demonstrates Permo-Carboniferous age for this late Variscan magmatic event. The granite is associated with a series of ore showings (F-Pb-Zn and Sn-W) which are completely different from the nearby, massive sulphide and manganese ore deposits of the Iberian Pyrite Belt, indicating the unique character of this intrusion.

References

Ballouard., C., Poujol, M., Boulvais, P., Branquet, Y., Tartèse, R., Vigneresse, J.L., 2016. Nb-Ta fractionation in peraluminous granites: A marker of the magmatic-hydrothermal transition. Geology, 44 (3), 231-234.

Barrie, C.T., Amelin, Y., Pascual, E., 2002. U-Pb geochronology of the VMS mineralization in the Iberian Pyrite Belt. Mineralium Deposita, 37, 684-703.

Bea, F., 2012. The sources of energy for crustal melting and the geochemistry of heat-producing elements. Lithos, 153, 278-291.

Bellido, F., Díez-Montes, A., Ortiz, G., 2006. Estudio petrológico y geoquímico de las vulcanitas de los afloramientos de El

Pimpollar, extremo nororiental de la Zona Surportuguesa. Geogaceta, 40, 127-130.

Braid, J.A., Brendan Murphy, J., Quesada, C., Bickerton, L., Mortensen, J.K., 2012. Probing the composition of unexposed basement, South Portuguese Zone, southern Iberia: implications for the connections between the Appalachian and Variscan orogens. Canadian Journal of Earth Sciences, 49, 591-613.

Chappell, B.W., White, A.J.R., 1974. Two contrasting granites types. Pacific Geology, 8, 173-174.

Chappell, B.W., Hine, R., 2006. The Cornubian Batholith: an Example of Magmatic Fractionation on a Crustal Scale. Resource Geology, 56(3), 203-244.

Chicharro, E., Villaseca, C., Valverde-Vaquero, P. Belousova, E., López-García, J.A., 2014. Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone). Journal of Iberian Geology, 40(3), 451-470.

de la Rosa, J.D., 1992. Petrología de las rocas básicas y granitoides del batolito de la Sierra Norte de Sevilla, Zona Surportuguesa, Macizo Ibérico. Doctoral Thesis, Universidad de Sevilla, 312pp.

de la Rosa, J.D., Rogers, G., Castro, A., 1993. Relaciones 87Sr/86Sr de rocas básicas y granitoides del Batolito de la Sierra Norte de Sevilla. Revista de la Sociedad Geológica de España, 6(1-2), 141-149.

Díez-Montes, A., Bellido Mulas, F., 2008. Magmatismo TTG y Al-K en la Zona Surportuguesa. Relaciones entre plutonismo y vulcanismo. Geo-Temas, 10, 1449-1452.

Díez-Montes, A., Leyva, F., Matas, J., Martín Parra, L.M., 1999. Mapa Geológico a escala 1:50.000 y Memoria de El Castillo de las Guardas (939). Investigación Geológica y Cartografía Básica en la Faja Pirítica y Áreas Aledañas. Available on line at: www.juntadeandalucia.es/economiainnovacioncienciayempleo/pam.

Dunning, G.R., Díez-Montes, A., Matas, J., Martín Parra, L.M., Almarza, J., Donaire, M., 2002. Geocronología U/Pb del volcanismo ácido y granitoides de la Faja Pirítica Ibérica, Zona Surportuguesa. Geogaceta, 32, 127-130.

Franke, W., 1992. Phanerozoic structures and events in Central Europe. In: Blundell, D., Freeman, R., Mueller St. (eds.). A

continental rrevealed: the European Geotraverse. Cambridge University Press, Cambridge, 164-179.

García-Cortés, A. (ed.). 2011. Cartografía de recursos minerales de Andalucía. IGME-Consejería de Economía, Innovación y

Ciencia de la Junta de Andalucía, Madrid, 608pp.

Harris, N.B.W., Pearce, J.A., Tindle, A.G., 1986. Geochemical characteristics of collision-zone magmatism. In: Coward, M.P., Alison, C. (eds.). Collision Tectonics. Geological Society London Special Publications, 19, 67-81.

IGME, Instituto Geológico y Minero de España, 1994. Mapa Geológico de la Península Ibérica, Baleares y Canarias. 1:50.000. Madrid, Servicio de Publicaciones del Instituto Geológico y Minero de España. Available at: http://info.igme.es/sigeof/

Isachen, C.E., Coleman, D.S., Schmitz, M., 2007. Pb MacDat program, Available at http://www.earthtime.org (last access:

.

Kramm, U., Giese, D., Zhuravlev, D., Walter, R., 1991. Isotope equilibration of magmatism and metamorphic rocks of the Aracena Metamorphic Belt. In: XI Reunión sobre la Geología del Oeste Peninsular, Universidad de Sevilla, Huelva, España.

Lotze, F., 1945. Zur Gliederung der Varisciden der Iberischen Meseta. Geotektonik Forschung, 6, 78-92. (Translated into Spanish by Ríos, J. M., 1950: Observaciones respecto a la división de las varíscides de la Meseta Ibérica. Publicaciones Extraordinarias de la Geología de España, V, 149-166).

Ludwig, K.R., 1999. ISOPLOT/Ex. version 2.00: A Geochronological Toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication, 1a, 46pp.

Mattison, J.M., 2005. Zircon U-Pb chemical abrasion (“CATIMS”) method: Combined annealing and multistep partial dissolution analysis for improved precision and accuracy of zircon ages. Chemical Geology, 220, 47-66.

Middlemost, E.A.K., 1994. Naming materials in the magma / igneous rocks system. Earth-Science Reviews, 37, 215-224.

Mitjavila, J., Martí, J., Soriano, C., 1997. Magmatic evolution and tectonic setting of the Iberian Pyrite Belt Volcanism. Journal of Petrology, 38, 727-755.

Munhá, J., 1983. Hercinian magmatism in the Iberian Pyrite Belt. In: Lemos de Souza, J., Oliveira, J.T. (eds.). The Carboniferous of Portugal. Memórias do Serviço Geológico de Portugal, 29, 39-81.

Neiva, A.M.R., 2002. Portuguese granites associated with Sn-W and Au mineralizations. Bulletin of the Geological Society of

Finland 74, Parts 1-2, 79-101.

Oliveira, J.T., 1990. South Portuguese Zone: Stratigraphy and Synsedimentary Tectonism. In: Dallmeyer, R.D., Martínez García, E. (eds.). Pre-Mesozoic Geology of Iberia. SpringerVerlag, Berlin, 333-347.

Oliveira, J.T., Horn, M., Paproth, E., 1979. Preliminary note on the stratigraphy of the Baixo Alentejo Flysh Group, Carboniferous of Portugal, and on the paleogeographic development to corresponding units in northwest Germany. Comunicações do Serviço Geológico de Portugal, 65, 151-168.

Pearce, J.A., 1996a. A User’s Guide to Basalt Discrimination Diagrams. In: Wyman, D.A. (ed.). Trace Element Geochemistry of Volcanic Rocks: Applications for Massive Sulphide Exploration. Geological Association of Canada, Short Course Notes, Vol. 12, 79-113.

Pearce, J.A., 1996b. Sources and setting of granitic rocks. Episodes, 19 (4), 120-125.

Pearce, J.A., Harris, N.B., Tindle, A.G., 1984. Trace element discrimination for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4), 956-983.

Quesada, C., Cueto, L.A., Dallmeyer, R.D., 1989. Nuevas dataciones absolutas en la Zona de Ossa Morena: limitaciones que se imponen a la evolución tectónica de la misma. XI Reunión Xeoloxia e Mineria do Noroeste Peninsular, Santiago de Compostela, España, 35-36.

Rubio Ordóñez, A, Valverde-Vaquero, P, Corretgé, L.G., CuestaFernández, A., Gallastegui, G., Fernández-González, M., Gerdes, A., 2012. An Early Ordovician tonalitic-granodioritic belt along the Schistose-Greywacke Domain of the Central Iberian Zone (Iberian Massif, Variscan Belt). Geological Magazine, 149(5), 927-939.

Schermerhorn, L.J.G., 1971. An outline stratigraphy of the Iberian Pyrite Belt. Boletín Geológico y Minero, 82, 239-268.

Schütz, W., Ebneth, J., Meyer, K.D., 1987. Trondhjemites, tonalites and diorites in the South Portuguese Zone and their relations to the vulcanites and mineral deposits of the Iberian Pyrite Belt. Geologische Rundschau, 76(1), 201-212.

Simancas, J.F., 1981. Plutonismo ácido y básico en el extremo oriental de la Zona Sudportuguesa. Cuadernos Geología Ibérica, 7, 309-326.

Simancas, J.F., 1983. Geología de la extremidad oriental de la Zona Sudportuguesa. Doctoral Thesis, Universidad de Sevilla, 439pp.

Sun, S., McDonough, W.F., 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders, A.D., Norry, M.J. (eds.). Magmatism in the Ocean Basins. Geological Society, London, Special Publications, 42, 313-345.

Valverde-Vaquero, P., 2009. Método de datación U-Pb ID-TIMS en el laboratorio geocronológico del IGME (Tres Cantos). VII Congreso Ibérico de Geoquímica, Tres Cantos, Madrid, 758-765.

Villaseca, C., Pérez-Soba, C., Merino, E., Orejana, D., LópezGarcía, J.A., Billstrom, K., 2008. Contrasting crustal sources for peraluminous granites of the segmented Montes de Toledo Batholith (Iberian Variscan Belt). Journal of Geosciences, 53, 263-280.

von Raumer, J.F., Stampfli, G.M., Bussy, F., 2003. Gondwanaderived microcontinents – the constituents of the Variscan collision orogens. Tectonophysics, 365, 7-22.

Downloads

Published

2017-11-03

Issue

Section

Granites and Related Rocks. A tribute to Guillermo Corretgé