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See	discussions,	stats,	and	author	profiles	for	this	publication	at:	http://www.researchgate.net/publication/277953323
Thermic	and	structural	evolution	of	the
external	crystalline	massif	of	Western	Alps
during	the	exhumation	phase	of	the	Alpine
orogeny	-	Abstract
RESEARCH	·	JUNE	2015
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8
1	AUTHOR:
Ugo	Nanni
Ecole	Normale	Supérieure	de	Paris
1	PUBLICATION			0	CITATIONS			
SEE	PROFILE
Available	from:	Ugo	Nanni
Retrieved	on:	23	July	2015
The maximum temperatures reached in the external crystalline massif of Western Alps are obtained in
this study by using Raman Spectroscopy of the Carbonaceous Material (RSCM) of the covers of Mont
Blanc and Aiguilles Rouges massifs.The coalification degree of the organic matter within the sediments
evolve in an irreversible way with the temperature. Hence it is a witness of the peak temperature
(T°max) reached by the rocks during the metamorphic cycle which is linked to the Alpine orogeny.
During the field study whose purpose was to understand the Morcles and Mont Joly nappes and the
Chamonix syncline cover behaviour, 23 samples were taken and their T°max were determined with the
RSCM thermometry. These temperatures range between 226°C and 389°C from NW to SE, from Cluses
to Mont Chétif and are going through Mont Joly cover and Chamonix syncline. We realized three
cross-sections in order to better constrain the structure and then be able to project the different tem-
peratures in a unique NW-SE cross-section. A structural comparison is done between Morcles and Mont
Joly covers, which is then integrated into a kinematic scenario of the external crystalline massif dyna-
mic during the orogeny. Furthermore, a restoration built with these temperatures allows us to be more
precise on the thermic structure of the Mont Blanc and the Aiguilles Rouges massifs between 22 and
30 million years. Integrating earlier works and previous considerations, a discussion is put forward.
Thermic and structural evolution of the external crystalline massif of Western Alps during
the exhumation phase of the Alpine orogeny
This study was conducted from June 14 to August 7 (2014) during an internship at the Institut des
Sciences de la Terre de Paris, Université Pierre et Marie Curie (France) under the supervision of Anne
Verlaguet and Nicolas Bellahsen .
UPMC Univ. Paris 06, UMR 7193, ISTeP, F-75005 Paris, France
CNRS, UMR 7193, ISTeP, F-75005 Paris, France
1, 2 1, 2
1
2
A publication is currently being prepared along with colleagues including these data on a broader
topic concerning the evolution of a collisional prism.
Contact: ugo.nanni0158@gmail.com
Morcles nappe
Mont Joly
nappe
external crystalline massif
faults
internal units
thrust
Mont Blanc
Aiguilles Rouges
Torino
Lausanne
50 km
Localisation of the study

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abstract

  • 2. The maximum temperatures reached in the external crystalline massif of Western Alps are obtained in this study by using Raman Spectroscopy of the Carbonaceous Material (RSCM) of the covers of Mont Blanc and Aiguilles Rouges massifs.The coalification degree of the organic matter within the sediments evolve in an irreversible way with the temperature. Hence it is a witness of the peak temperature (T°max) reached by the rocks during the metamorphic cycle which is linked to the Alpine orogeny. During the field study whose purpose was to understand the Morcles and Mont Joly nappes and the Chamonix syncline cover behaviour, 23 samples were taken and their T°max were determined with the RSCM thermometry. These temperatures range between 226°C and 389°C from NW to SE, from Cluses to Mont Chétif and are going through Mont Joly cover and Chamonix syncline. We realized three cross-sections in order to better constrain the structure and then be able to project the different tem- peratures in a unique NW-SE cross-section. A structural comparison is done between Morcles and Mont Joly covers, which is then integrated into a kinematic scenario of the external crystalline massif dyna- mic during the orogeny. Furthermore, a restoration built with these temperatures allows us to be more precise on the thermic structure of the Mont Blanc and the Aiguilles Rouges massifs between 22 and 30 million years. Integrating earlier works and previous considerations, a discussion is put forward. Thermic and structural evolution of the external crystalline massif of Western Alps during the exhumation phase of the Alpine orogeny This study was conducted from June 14 to August 7 (2014) during an internship at the Institut des Sciences de la Terre de Paris, Université Pierre et Marie Curie (France) under the supervision of Anne Verlaguet and Nicolas Bellahsen . UPMC Univ. Paris 06, UMR 7193, ISTeP, F-75005 Paris, France CNRS, UMR 7193, ISTeP, F-75005 Paris, France 1, 2 1, 2 1 2 A publication is currently being prepared along with colleagues including these data on a broader topic concerning the evolution of a collisional prism. Contact: ugo.nanni0158@gmail.com Morcles nappe Mont Joly nappe external crystalline massif faults internal units thrust Mont Blanc Aiguilles Rouges Torino Lausanne 50 km Localisation of the study