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Genesis and transformation of dickite in Permo-Triassic sediments (Betic Cordilleras, Spain)

Published online by Cambridge University Press:  09 July 2018

M. D. Ruiz Cruz  and
B. Andreo
M. D. Ruiz Cruz
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071, Málaga, Spain
B. Andreo
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071, Málaga, Spain
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Abstract

In the Maláiguide Complex (Betic Cordilleras, Spain), dickite is widely developed in clastic Permo-Triassic sequences. The lateral extent stretches at least 300 km along the Betic range, whilst vertical extent is variable and appears limited to the lowest 20–150 m of these sequences. Textural, chemical and crystallochemical characteristics of the dickite, illite/mica and chlorite in dickite-bearing rocks and in the overlying (Permo-Triassic) and underlying (Carboniferous) rocks have been investigated to determine the approximate conditions in which dickite has developed. Using the chlorite geothermometer (based on A1IV contents), temperatures of 146±28°C and 169±12°C have been deduced for two Permo-Triassic members, and 305±12°C for Carboniferous. The Si content in illites has been used as a geobarometer, and pressures of 4.8±2 kbar have been estimated in Carboniferous rocks and tentative pressures of 2.7±3 and 2.1±2 kbar in Permo-Triassic members. Chemical evolution of phyllosilicates is accompanied by increasing illite crystallinity and % 2M1 polytype.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 2 , June 1996 , pp. 133 - 152
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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