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Clay mineralogy of the Tertiary sediments in the Internal Subbetic of Málaga Province, S Spain: implications for geodynamic evolution

Published online by Cambridge University Press:  09 July 2018

F. J. Alcalá-García ,
M. Martín-Martín  and
A. López-Galindo
F. J. Alcalá-García
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002 Granada
M. Martín-Martín
Affiliation:
Departamento de Medio Ambiente y Cienciasde la Tierra, Universidadde Alicante, Facultad de Ciencias, AP 99, 03080 Alicante, Spain
A. López-Galindo*
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002 Granada
*
*E-mail: [email protected]
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Abstract

The clay mineralogy of a set of Tertiary marine sediments from the Internal Subbetic of the Betic External Zone was examined. Two types of sedimentary environment were distinguished: a platform environment consisting of limestones, marls, organogenic limestones, conglomerates and silexites distributed heterogeneously in time and space; and deep environments, where the sedimentation consisted of marls, marly limestones, marly clays and silexites, with no sedimentary gap. A third group of sediments studied belongs to the Águila Complex, with mineralogical and stratigraphic characteristics very similar to the platform sediments. This third type of sediment is found in the sediments of the Campo de Gibraltar Complex as large, disperse blocks resulting from tectonic activity. A very similar mineral association was observed in all three domains, consisting of smectite, illite, mixed-layer I-S, kaolinite and lesser amounts of palygorskite and chlorite. Materials mainly derive from the erosion of Mesozoic sediments, and sedimentation was controlled by the compressive tectonics of the region.

Keywords

Tertiarypalaeogeographyclay mineralsInternal SubbeticBetic Cordillera
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 4 , December 2001 , pp. 615 - 620
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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