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Mineralogy and geochemistry of Devonian detrital rocks from the Iberian Range (Spain)

Published online by Cambridge University Press:  09 July 2018

B. Bauluz Lazaro ,
M.J. Mayayo Burillo ,
C. Fernandez-Nieto  and
J.M. Gonzalez Lopez
B. Bauluz Lazaro
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pza San Francisco s/n, 50.009 Zaragoza, Spain
M.J. Mayayo Burillo
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pza San Francisco s/n, 50.009 Zaragoza, Spain
C. Fernandez-Nieto
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pza San Francisco s/n, 50.009 Zaragoza, Spain
J.M. Gonzalez Lopez
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pza San Francisco s/n, 50.009 Zaragoza, Spain
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Abstract

Two profiles in Devonian marine deposits have been studied, consisting of pelites, subgreywackes, greywackes and quartzites. Quartz and clay minerals are major components and feldspar and calcite are minor ones. Phyllosilicates in the fine fractions are kaolinite and illite; kaolinite has a high degree of ordering; illite is predominantly of a 1Md polytype, with low Na content and poor crystallinity and has a phengitic composition in greywackes, whereas in pelites it is muscovitic in composition. Both phyllosilicates may be inherited from a source area with intensive weathering processes, although illite may also be a diagenetic phase. These mineral characteristics indicate that the Devonian rocks did not reach the anchizone boundary in their post-depositional evolution.

The chemical composition of pelites and subgreywackes reveals a high degree of chemical maturity. Chondrite-normalized REE patterns indicate a higher degree of weathering of these Devonian sediments than of Post-Archaean Australian Shales (PAAS), possibly as a consequence of sedimentary recycling processes. The REE patterns of the Devonian rocks in addition to the high Th/Sc, La/Sc and Th/Co ratios suggest a felsic composition of the primitive source area, probably a K-rich granite.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 4 , December 1995 , pp. 381 - 394
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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