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Clay diagenesis and low-grade metamorphism of Tithonian and Berriasian sediments in the Cameros Basin (Spain)

Published online by Cambridge University Press:  09 July 2018

J. F. Barrenechea ,
M. Rodas ,
M. Frey ,
J. Alonso-Azcárate  and
J. R. Mas
J. F. Barrenechea*
Affiliation:
Departamento de Cristalografía y Mineralogía, Universidad Complutense de Madrid, 28040 Madrid, Spain
M. Rodas
Affiliation:
Departamento de Cristalografía y Mineralogía, Universidad Complutense de Madrid, 28040 Madrid, Spain
M. Frey
Affiliation:
Mineralogisch-PetrographischesInstitut, Basel University, CH 4056 Basel, Switzerland(deceased)
J. Alonso-Azcárate
Affiliation:
Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Fábrica de Armas, 45071 Toledo, Spain
J. R. Mas
Affiliation:
Departamento de Estratigrafía, Universidad Complutense de Madrid, 28040 Madrid, Spain
*
*E-mail: [email protected]
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Abstract

The clay mineral assemblages of the Tithonian and Berriasian sediments (Tera and Oncala Groups) in the eastern part of the Cameros basin are investigated at seven localities. The lowest-grade assemblage, located on the southern border of the basin, contains calcite + quartz + hematite + kaolinite + mixed-layer illite-smectite (R = 1, 65 85% illite layers) + discrete illite (IC = 0.5 0.65Δ°2θ). Systematic increases in the illite and chlorite crystallinities suggest increasing metamorphic grade from the northwest part of the basin to the southeast. This trend does not follow the pattern previously described for the overlying late Berriasian–early Aptian sediments (Urbión and Enciso Groups), which exhibit a higher metamorphic grade. This may result from local variations in sedimentary facies, as well as the circulation of hot migratory fluids. Tertiary compression occurring long after the main metamorphic event is considered to be responsible for the enhanced illite and chlorite crystallinities measured in the SE extreme of the basin.

Keywords

diagenesislow-grade metamorphismclay mineralsillite crystallinitychlorite crystallinity
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 3 , September 2001 , pp. 325 - 333
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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References

Alonso-Azcárate, J., Barrenechea, J.F., Rodas, M. & Mas, J.R. (1995) Comparative study of the transition between very low grade and low grade metamorphism in siliciclastic and carbonate sediments. Early Cretaceous, Cameros Basin (North Spain). Clay Miner. 30, 407–419.CrossRefGoogle Scholar
Alonso-Azcárate, J., Rodas, M., Bottrell, S.H., Raiswell, R., Velasco, F. & Mas, J.R. (1999) Pathways and distances of fluid flow during low-grade metamorphism: Evidence from pyrite deposits of the Cameros Basin, Spain. J. Metam. Geol. 17, 339–348.CrossRefGoogle Scholar
Barrenechea, J.F., Rodas, M. & Mas, J.R. (1995) Clay mineral variation associated with diagenesis and low grade metamorphism of Early Creataceous sediments in the Cameros Basin, Spain. Clay Miner. 30, 119–133.CrossRefGoogle Scholar
Barrenechea, J.F., Rodas, M., Frey, M., Alonso-Azcárate, J. & Mas, J.R. (2000) Chlorite, corrensite, and chlorite-mica in late jurassic fluvio-lacustrine sediments of the Cameros basin of northeastern Spain. Clays Clay Miner. 48, 256–265.CrossRefGoogle Scholar
Beuther, A. (1965) Geologische untersuchungen in Weladen und Utrillas Schichten im Westteil der Sierra de los Cameros (Nordwestlich Iberischen Ketten). Geol. Jahrb. Biehefte, 44, 103–121.Google Scholar
Caillère, S., Henin, S. & Rautere au, M. (1982) Minèralogie des Argiles. I. Structure et Propriétés Physico-chimiques. Masson ed., Paris.Google Scholar
Casquet, C., Galindo, C., González Casado, J.M., Alonso, A., Mas, J.R., Rodas, M., García, E. & Barrenechea, J.F. (1992) El metamorfismo en la Cuenca de los Cameros. Geocronología e implicaciones tectónicas. Geogaceta, 11, 22–25.Google Scholar
Fernández Caliani, J.C. & Galán, E. (1992) Influence of tectonic factors on illite crystallinity: a case study in the Iberian pyrite Belt. Clay Miner. 27, 385–388.CrossRefGoogle Scholar
Frey, M. & Robinson, D. (1999) Low-grade Metamorphism (Frey, M. & Robinson, D., editors). Blackwell Science Ltd, Oxford, UK.Google Scholar
Gómez Fernández, J.C. (1992) Análisis de la Cuenca sedimentaria de los Cameros durante sus etapas iniciales de relleno en relación con su evolución paleogeográfica. PhD thesis, Univ. Complutense de Madrid.Google Scholar
Guimerá, J., Alonso, A. & Mas, J.R. (1995) Inversion of an extensional-ramp basin by a neoformed thrust: The Cameros basin (N Spain). Pp. 433–453 in. Basin Inversion (Buchanan, J.G. & Buchanan, P.G., editors). Geol. Soc. Spec. Publ. 88. Geological Society, London.Google Scholar
Guiraud, M. & Seguret, M. (1985) A realising solitary overst ep model for the late Jurassi c–Early Cretaceous (Wealdian) Soria strike- slip basin (Northern Spain). SEPM Spec Publ. 37, 159–175.Google Scholar
Mantilla Figueroa, L.C., Casquet, C. & Mas, J.R. (1998) Los paleofluidos en el grupo Oncala, Cuenca de Cameros (La Rioja, España): Datos de inclusiones fluidas, isótopos de oxígeno y SEM. Geogaceta, 24, 145–148.Google Scholar
Mas, J.R., Alonso, A. & GuimeráJ. (1993) Evolución tectonosedimentaria de una cuenca extensional intraplaca: la cuenca finijurásica-eocretácica de Los Cameros (La Rioja-Soria). Rev. Soc. Geol. España, 6, 129–144.Google Scholar
Mata, M.P. (1997) Caracterización y evolución mineralógica de la cuenca mesozoica de Cameros (Soria- La Rioja). PhD thesis, Univ. Zaragoza, Spain.Google Scholar
Mata, M.P., Gil Imaz, A., Casas Sainz, A., Pocovi, J.A. & Canals, A. (1996) La extensión cretácica en la Cuenca de Cameros: resultado del análisis estructural de grietas de cuarzo y del estudio de inclusiones fluidas. Geogaceta, 20, 893–896.Google Scholar
Moore, D.M. & R.C.Reynolds, Jr., (1998) X-ray Diffraction and the Identification and Analysis of Clay Minerals. Oxford University Press, New York.Google Scholar
Tischer, G. (1965) Über die Wealden-Ablagerung und die Tektonik der östlichen Sierra de los Cameros in den norwestlichen Iberischen Ketten (Spanien). Geol. Jahrb. Biehefte, 44, 123–164.Google Scholar
Wang, H., Frey, M. & Stern, W. (1996) Diagenesis and metamorphism of clay minerals in the Helvetic Alps of eastern Switzerland. Clays Clay Miner. 44, 96–112.CrossRefGoogle Scholar