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Evidence of contrasting low-grade metamorphic conditions from clay mineral assemblages in Triassic Alpujárride- Maláguide transitional units in the Betic Cordilleras, Spain

Published online by Cambridge University Press:  09 July 2018

M. D. Ruiz Cruz ,
F. Franco ,
C. Sanz De Galdeano  and
J. Novák
M. D. Ruiz Cruz*
Affiliation:
Departamento de Quimica Inorgániea, Cristalografia y Mineralogía, Facultadde Ciencias, Campus de Teatinos, 18071 Málaga, Spa
F. Franco
Affiliation:
Departamento de Quimica Inorgániea, Cristalografia y Mineralogía, Facultadde Ciencias, Campus de Teatinos, 18071 Málaga, Spa
C. Sanz De Galdeano
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, 18071-Granada, Spain
J. Novák
Affiliation:
Institute of Geology, Rozvojovà 135, 26502 Prague, Czech Republic
*
*E-mail: mdruiz@uma.es
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Abstract

Triassic sequences from 'intermediate units' between the Alpujárride and the Malâguide complexes (Betic Cordilleras, Spain) of the westernmost part of the Cordilleras (Casares area) occur as four superimposed tectonic units; the uppermost unit shows lithological characteristics similar to those of the Malâguide complex, changing progressively at increasing depth, towards lithologies typical of the Alpujárride complex. The units studied, with a maximum thickness of ~400 m, record important variations in metamorphic pressures, according to the b parameter of white micas: from low-pressure metamorphism (in the unper unit) to high-pressure faciès series (in the deepest one). The mean b values range from 8.988 Å in the uppermost unit (Crestellina) to 9.042 Å in the lowermost one (Jubrique). The lowest metamorphic grade is represented by mineral assemblages consisting of phengite + intermediate Na-K white mica ± Fe-chlorite ± sudoite ± pyrophyllite, which record temperatures of ~300°C and pressures of 1.5—3 kbar. At increasing tectonic depth, intermediate Na-K mica and pyrophyllite disappear and the metamorphic assemblages consist of phengite ± paragonite ± margarite + Mg-chlorite ± sudoite, which record minimum pressures of ~7 kbar and temperatures in the order of 400—450°C. These mineral assemblages provide evidence of the passage from collisional to extensional geotectonic settings. The units showing different metamorphic patterns were juxtaposed tectonically, after the development of metamorphic mineral assemblages.

Keywords

K white mica b geobarometrymargariteparagonitephengitepyrophyllitelow-grade metamorphismmetapeliteBetic CordillerasSpain.
Type
Research Article
Information
Clay Minerals , Volume 41 , Issue 2 , June 2006 , pp. 619 - 636
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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