Hi Janos,
If I’m well oriented, 50k BRGM geological maps mention “your” faults… with antithetic geometries & high dip angles. Could be a graben with small offset… for precise kinematics, next time you will have to climb!
Cheers,
Cécile
Cécile ALLANIC
Structural Geologist PhD
Georessources Division
Tél. : +33 (0)2 38 64 30 35
BRGM - SERVICE GÉOLOGIQUE NATIONAL
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De : Tectonics & structural geology discussion list <[log in to unmask]> De la part de Dirk Nieuwland
Envoyé : vendredi 10 août 2018 20:20
À : [log in to unmask]
Objet : Re: a small graben in the Vignemale?
Hallo Janos
Did you consider a compressional anticline associated with thrusting and an associated outer-arc extensional collapse structure bound small normal faults?
Greetings, Dirk Nieuwland
Sent from my iPaded
On Aug 8, 2018, at 2:42 PM, Oriol Ferrer <[log in to unmask]> wrote:
Hi Janos,
Hope holidays and climbing in the Pyrenees were great!
Talking this morning with Josep Anton Muñoz about your question, he said me that he climbed several times the north wall of the Vignemale and he don’t remember any graben in the area. This could be a visual effect caused by the stratification of the limestones that are strongly folded and steeply dipping in the area.
Cheers,
Oriol Ferrer
Lecturer & Research Scientist
Geomodels Research Institute
http://www.ub.edu/geomodels/
Department de Ciències de la Terra i de l´Oceà
http://www.ub.edu/geodgf/en
Facultat de Ciències de la Terra
University of Barcelona
C/ Martí i Franquès s/n
08028 Barcelona
Office phone: 00 34 934035913
Fax: 00 34 934021340
e-mail: [log in to unmask]
De: Tectonics & structural geology discussion list <[log in to unmask]> de part de Janos Urai RWTH <[log in to unmask]>
Enviat el: dimecres, 8 d’agost de 2018 12:23:45
Per a: [log in to unmask]
Tema: a small graben in the Vignemale?
Dear colleagues,
last week I hiked around the Vignemale massif in the Pyrenees, and wondered if the Piton Carree peak in the picture below was in fact a small graben bounded by two steep normal faults. The possible offset is difficult to see because the high grade metamorphics-marble contact (dark-light) is steeply dipping.
Maybe somebody who is familiar with the area could help me?
kind regards,
Janos
Prof. Dr. Janos L. Urai
Structural Geology, Tectonics and Geomechanics
RWTH Aachen University, Lochnerstrasse 4-20
D-52056 Aachen, Germany
T: +49 241 809 5723 e-mail: [log in to unmask]
www.ged.rwth-aachen.de
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