Conodont alteration and tectonothermal evolution of a diagenetic unit in the Iberian Variscan Belt (Ponga-Cuera Unit, NW Spain)

Tectonothermal analysis of a mainly carbonate unit located in the external part of the Variscan orogen in NW Spain is dealt with using the conodont colour alteration index (CAI) and the study of textures of these microfossils. The Kubler index of the illite (KI) is used as a complementary method. Th...

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Bibliographic Details
Published in:Geological magazine 2011-01, Vol.148 (1), p.35-49
Main Authors: Blanco-Ferrera, Silvia, Sanz-López, Javier, García-López, Susana, Bastida, Fernando, Valín, M. Luz
Format: Article
Language:English
Subjects:
alteration
assemblages
Asturias Spain
authigenic minerals
Cantabrian Mountains
carbonate rocks
Carboniferous
Cenozoic
clay minerals
coal
color alteration index
Conodonta
diagenesis
epithermal processes
Europe
Galicia Spain
Geological time
heating
Iberian Peninsula
Illite
Low temperature
microfossils
mineral composition
mineral deposits, genesis
Mineralogy
orogenic belts
Paleozoic
palynomorphs
Pennsylvanian
Permian
Plate tectonics
Ponga-Cuera Unit
rank
sed rocks, sediments
sedimentary petrology
sedimentary rocks
sheet silicates
silicates
Southern Europe
Spain
Structural geology
tectonic units
tectonics
textures
thermal anomalies
thermal history
Variscides
vitrinite reflectance
X-ray diffraction data
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Summary:Tectonothermal analysis of a mainly carbonate unit located in the external part of the Variscan orogen in NW Spain is dealt with using the conodont colour alteration index (CAI) and the study of textures of these microfossils. The Kubler index of the illite (KI) is used as a complementary method. The area is characterized by a great uniformity in the CAI values, which in most cases are
ISSN:0016-7568
1469-5081
DOI:10.1017/S0016756810000269