Evidence of an upper ordovician thermo-metamorphic event in the SW-Corner of the Cantabrian Mountains (N-Spain)

M. Keller; S. Krumm

doi:10.3989/egeol.92485-6395

Evidence of an upper ordovician thermo-metamorphic event in the SW-Corner of the Cantabrian Mountains (N-Spain)

Authors

M. Keller Institut für Geologie und Mineralogie, Universität Erlangen-Nürnberg, Erlangen
S. Krumm Institut für Geologie und Mineralogie, Universität Erlangen-Nürnberg, Erlangen

DOI:

https://doi.org/10.3989/egeol.92485-6395

Keywords:

Spain, Cantabrian Mountains, Somiedo-Correcilla Unit, Narcea Anticline, Upper Ordovician, Illite crystallinity, very low-grade metamorphism, thermo-metamorphism

Abstract

According to Illite «crystallinity» (IC) data, the metamorphic evolution of the SW Cantabrian Mountains took place in several steps. After a Precambrian deformation with accompanying low-grade metamorphism a thermal event during the Upper Ordovician affected the Cambro-Ordovician sediments. This event is marked by anchizonal IC values in the Pre-Silurian sequence contrasting the diagenetic data obtained from Siluro-Devonian rocks.

Apparently, the metamorphic history in that part of the Cantabrian Mountains ended during the Late Ordovician, a Hercynian metamorphism cannot be proven conclusively.

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Published

1992-12-30

How to Cite

Keller, M., & Krumm, S. (1992). Evidence of an upper ordovician thermo-metamorphic event in the SW-Corner of the Cantabrian Mountains (N-Spain). Estudios Geológicos, 48(5-6), 289–296. https://doi.org/10.3989/egeol.92485-6395

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Issue

Vol. 48 No. 5-6 (1992)

Section

Articles

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