Universidad Complutense de Madrid
E-Prints Complutense

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

Impacto

Descargas

Último año



Fernández Barrenechea, José María y Rodas, Magdalena y Frey, Martín y Alonso Azcárate, Jacinto y Mas Mayoral, José Ramón (2011) Clay diagenesis and low-grade metamorphism of Tithonian and Berriasian sediments in the Cameros Basin (Spain). Clay minerals, 36 . pp. 325-333. ISSN 0009-8558

[img]
Vista previa
PDF
328kB

URL Oficial: http://www.minersoc.org/pages/e_journals/clay.html



Resumen

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, 6585% illite layers) + discrete illite (IC
= 0.50.65D82y). 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 (Urbio´n 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.


Tipo de documento:Artículo
Palabras clave:Diagenesis, Low-grade metamorphism, Clay minerals, Illite crystallinity, Chlorite crystallinity
Materias:Ciencias > Geología > Mineralogía
Código ID:17595
Depositado:09 Ene 2013 11:44
Última Modificación:11 Dic 2018 08:46

Descargas en el último año

Sólo personal del repositorio: página de control del artículo