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Source tracing of detrital serpentinite in the Oligocene molasse deposits from the western Alps (Barrême basin): implications for relief formation in the internal zone

Published online by Cambridge University Press:  31 January 2012

S. SCHWARTZ ,
S. GUILLOT ,
P. TRICART ,
M. BERNET ,
S. JOURDAN ,
T. DUMONT  and
G. MONTAGNAC
S. SCHWARTZ*
Affiliation:
IsTerre, CNRS, Université Joseph Fourier (Grenoble1), F-38041 Grenoble, Cedex 9, France
S. GUILLOT
Affiliation:
IsTerre, CNRS, Université Joseph Fourier (Grenoble1), F-38041 Grenoble, Cedex 9, France
P. TRICART
Affiliation:
IsTerre, CNRS, Université Joseph Fourier (Grenoble1), F-38041 Grenoble, Cedex 9, France
M. BERNET
Affiliation:
IsTerre, CNRS, Université Joseph Fourier (Grenoble1), F-38041 Grenoble, Cedex 9, France
S. JOURDAN
Affiliation:
IsTerre, CNRS, Université Joseph Fourier (Grenoble1), F-38041 Grenoble, Cedex 9, France
T. DUMONT
Affiliation:
IsTerre, CNRS, Université Joseph Fourier (Grenoble1), F-38041 Grenoble, Cedex 9, France
G. MONTAGNAC
Affiliation:
Laboratoire des Sciences de la Terre, CNRS, ENS Lyon, France
*
†Author for correspondence: [email protected]
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Abstract

We present the first contribution of tracing the source area of ophiolitic detritus in the Alpine molasse deposits by Raman spectroscopy. The lower Oligocene molasse deposits preserved in the Barrême basin, in the SW foreland of the western Alpine arc, are known for the sudden arrival of the first ‘exotic’ detritus coming from the internal Alpine zones. Among them, the pebbles of serpentinized peridotites have so far not been studied. We show that they only consist of antigorite serpentinite, implying that they originate from erosion of high temperature blueschists. In contrast, the upper Oligocene/lower Miocene molasse shows mixed clasts of serpentine including antigorite and lizardite without any evidence of chrysotile. This suggests that they were derived from a less metamorphosed unit such as the low temperature blueschist unit. Taking into account the sediment transport direction in the basin and the varied metamorphic characteristics of the other ocean-derived detritus, we constrain the lithologic nature of the source zones and the location of the relief zones, identified as the internal Alps, SE of the Pelvoux external crystalline massif. Available structural data and in situ thermochronological data allow the reconstruction of the Oligocene to early Miocene collisional geometry of the Palaeogene subduction wedge. This phase corresponds to two major phases of uplift evolving from a single relief zone located above the Ivrea body during early Oligocene times and persisting up to early Miocene times; then during late Oligocene/early Miocene times a second relief zone developed above the Briançonnais zone. At that time, the internal western Alps acquired its double vergency.

Keywords

serpentinite pebblesRaman spectroscopysource tracingwestern AlpsBarrême basin
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 5 , September 2012 , pp. 841 - 856
Copyright
Copyright © Cambridge University Press 2012

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