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Nature and characteristics of 1:1 phyllosilicates from weathered granite, Central Spain

Published online by Cambridge University Press:  09 July 2018

J. Garcia-Talegon ,
E. Molina  and
M. A. Vicente
J. Garcia-Talegon
Affiliation:
Inst. Recursos Naturales y Agrobiología, CSIC, Salamanca
E. Molina
Affiliation:
Dpt. Geología Universidad de Salamanca, Spain
M. A. Vicente
Affiliation:
Inst. Recursos Naturales y Agrobiología, CSIC, Salamanca
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Abstract

The nature and characteristics of 1:1 phyllosilicates (crystallinity, order and proportion of kaolinite, disordered kaolinite and 7 Å-halloysite) in deep palaeoweathering profiles developed on granitic rocks in Central Spain have been studied. The profile displays a lower part of non-silicified saprolite and an upper part of silicified saprolite, with or without a sedimentary silicified cover. The <2 µm fraction was studied using XRD, TG-DTA and IR techniques. Towards the top of the profile there is a progressive decrease in both 1:1 phyllosilicates and kaolinite contents and an increase in opal. In the upper part (silicified saprolite) two weathering fades can be distinguished: the 'white fades', in which the crystallinity of kaolinite is greater than in the 'red facies. The kaolinite in the upper parts of the profile is probably a remnant of that existing in the non-silicified saprolite, whereas disordered kaolinite and 7Å-halloysite are, at least in part, a product of transformation and/or neoformation under more surface-like conditions.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 5 , December 1994 , pp. 727 - 734
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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References

Banfield, J.F. & Eggleton, R.A. (1988) Transmission electron microscope study of biotite weathering. Clays Clay Miner. 36, 47–60.CrossRefGoogle Scholar
Bisdom, E.B.A. (1967) Micromorphology of a weathering granite near the Ria de Arosa (NW Spain). Leidse Geologische Mededelingen. 37, 34–67.Google Scholar
Bianco, J.A. (1991) Primera parada. Los procesos de silicificacion asociados al Paleogeno basal del borde SW de la Cuenca del Duero: I Sobre alteritas preterciarias del zocalo hercfnico. Pp. 199-210 in: Alteraciones y Paleoalteraciones en la Morfologia del Oeste Peninsular. (Blanco, J.A., Molina, E. & Martin Serrano, A., editors). Publ. ITGE & SEG Monografia 6.Google Scholar
Bianco, J.A. & Cantano, M. (1983) Silicification Contemporaine a la Sedimentation dans L'Unite Basale du Paleogene du Bassin du Duero (Espagne). Sci. Ge'ol. Mem. 72, 7–18.Google Scholar
Blanco, J.A., Corrochano, A., Montigny, R. & Thuizat, R. (1982) Sur 1'age du debut de la sedimentation dans le bassin tertiaire du Duero (Espagne). Atribution au Paleoccne par datation isotopique des alunites de I'unite inferiure. C. R. Acad. Sci. Paris. 295, 259–262.Google Scholar
Brewer, R. (1964) Fabric and Mineral Analysis of Soils. John Wiley & Sons Inc., New York.Google Scholar
Brindley, G.W. (1980) Order-disorder in clay mineral structures. Pp. 125-197 in: Crystal Structures of Clay Minerals and their X-ray Identification (Brindley, G.W. & Brown, G., editors). Mineralogical Society, London.CrossRefGoogle Scholar
Bustillo, M.A. & Martin-Serrano, A. (1980) Caracterizacion y significado de las rocas siliceas y ferruginosas del Paleoceno de Zamora. Tecniterrae 36, 14–29.Google Scholar
Caillere, S., Henin, S. & Rautureau, M. (1982) Mineraux a ik. Pp. 19-45 in: Mineralogie des Argiles. 2. Classification et Nomenclature. 1NRA et Masson, Paris.Google Scholar
Churchman, G.J. & Carr, R.M. (1975) The definition and nomenclature of halloysites. Clays Clay Miner. 20, 241–246.CrossRefGoogle Scholar
Churchman, G.J. & Theng, B.K.G. (1984) Interactions of halloysites with amides: mineralogical factors affecting complex formation. Clay Miner. 19, 161–175.CrossRefGoogle Scholar
Churchman, G.J., Whitton, J.S., Claridge, G.G.C. & Theng, B.K.G. (1984) Intercalation method using formamide for differentiating halloysite from kaolinite. Clays Clay Miner. 32, 241–248.CrossRefGoogle Scholar
Fernandez-Garcia, P., Mas, R., Rodas, M., LUQUE DEI, Villar, F.J. & Garzon, M.G. (1989) Los depositos aluviales del Paleógeno Basal en el Sector Suroriental de la Cuenca del Duero (Privincia de Segovia): Evolución y minerales de las arcilla caracteriticos. Estudios Geol. 45, 27–43.CrossRefGoogle Scholar
Fordham, A.W. (1990) Weathering of biotite into dioctahedral clay minerals. Clay Miner. 25, 51–63.CrossRefGoogle Scholar
Galan, E. & La Iglesia, A. (1977) A discusssion about kaolin genesis and synthesis. Proc. 8th Int. Kaolin Sym. Meet. Alunite, Madrid-Roma K-7. Google Scholar
Garcia-Talegon, J., Molina, E. & Vicente, M.A. (1991) Weathering processes in granites. Proc. 7th Euroclay Conf. Dresden, 2, 405–409.Google Scholar
Hughes, J.C. (1980) Crystallinity of kaolin minerals and their weathering sequence in some soils from Nigeria, Brazil and Columbia. Geoderma 24, 317–325.CrossRefGoogle Scholar
Hughes, J.C. & Brown, G. (1979) A crystallinity index for soil kaolins and its relation to parent rock, climate and soil maturity. J. Soil. Sci. 30, 557–563.CrossRefGoogle Scholar
Keller, W.D. (1970) Environmental aspects of clay minerals. J. Sed. Pet. 40, 788–813.CrossRefGoogle Scholar
Kitagawa, R. & Koster, H.M. (1991) Genesis of the Tirschenreuth kaolin deposit in Germany compared with the Kohdachi kaolin deposit in Japan. Clay Miner. 26, 61–70.CrossRefGoogle Scholar
Kuzvart, M. (1977) Aspects of kaolin genesis. Proc. 8th Int. Kaolin Sym Meet. Alunite, Madrid-Roma K-12. Google Scholar
Martin-Serrano Garcia, A. (1988) El relieve de la region occidental zamorana. Un modelo de evolucion geomorfologica del borde hesperico. Insto. de Estudios Zamoranos ‘Florian de Ocampo', Diputacion de Zamora.Google Scholar
Molina, E. & Blanco, J.A. (1980) Quelques precisions sur l'alteration du Massif Hercinien espagnol. C.R. Acad. Sci. Paris 290, 1293–1296.Google Scholar
Molina, E., Garcia-Gonzalez, M.T. & Espejo, R. (1991). Study of paleoweathering on the Spanish Hercynian basement. Montes de Toledo (Central Spain). Catena 18, 345–354.CrossRefGoogle Scholar
Molina, E., Vicente, M.A., Cantano, M. & Martinserrano, A. (1989). Importancia e implicaciones de las paleoalteraciones y de los sedimentos siderolfticos del paso Mesozoi'co-Terciario en el borde Suroeste de la Cuenca del Duero y Macizo Hercinico Iberico. Stv. Geol. Salmanticensia 5, 177–186.Google Scholar
Molina Ballesteros, E. (1991) Geomorfologia y Geoquimica del Paisaje. Acta Salmanticensia, Biblioteca de Las Ciencias, 72, Ed. Universidad de Salamanca.Google Scholar
Nahon, D.B. (1991) Introduction to the Petrology of Soils and Chemical Weathering. John Wiley & Sons, Inc., New York.Google Scholar
Parker, T.W. (1969) A classification of kaolinites by infrared spectroscopy. Clay Miner. 8, 135–141.CrossRefGoogle Scholar
Riedel, W. (1973) Bodengeographie des Kastilischen und Portugiesischen Hautpscheidergebirges. Mitteilungen der Geographic. Gesellschaft in Hamburg. 62.Google Scholar
Romero, R., Garcia, C. & Macias, F. (1991) Utilizacion del test de la formamida en la identificacion de los filosilicatos 1:1 de suelos de la provincia de La Corufia. Suelo y Planta 1, 33–18.Google Scholar
Singh, B., Gilkes, R.J. & BurrC.R.M. (1992) An electron optical investigation of aluminosilicate cements in silcretes. Clays Clay Miner. 40, 707–721.CrossRefGoogle Scholar
Smykatz-Kloss, W. (1974) The determination of the degree of (dis-) order of kaolinites by means of differential thermal analysis. Chemie der Erde 33, 358–364.Google Scholar
Smykatz-Kloss, W. (1975) The DTA determination of the degree of (dis-) order of kaolinites: method and application to some kaolin deposits of Germany. Proc. Int. Clay Conf. Mexico City 429-438.Google Scholar
Souza Santos, P., SOUZA Santos, H. & Brindley, G.W. (1966) Mineralogical studies of kaolinite-halloysite clays: Part IV. A platy mineral with structural swelling and shrinking characteristics. Am. Miner. 51, 1640–1649.Google Scholar
Vicente, M.A., Molina, E. & Espejo, R. (1991) Clay in paleoweathering processes: Study of a typical weathering profile in the Hercinian basement in the Montes de Toledo (Spain). Clay Miner. 26, 81–90.CrossRefGoogle Scholar
Wilson, M.J. (1987) A Handbook of Determinative Methods in Clay Mineralogy. Blackie, London.Google Scholar