L
J
Last name: LARDEAUX
First name: Jean-Marc
International audience
In this paper we review and discuss, in a synthetic historical way, the main results obtained on Variscan metamorphism in the French Massif Central. First, we describe the pre-orogenic architecture of the French Massif Central on the base of available lithostratigraphic and geochemical constraints. Second, we portray the progressive metamorphic...
International audience
Deciphering orogenic evolution requires the integration of a growing number of geological and geophysical techniques on various spatial and temporal scales. Contrasting visions of mountain building and lithospheric deformation have been proposed in recent years. These models depend on the respective roles assigned to the mantle, the crust or...
The Massif Central, like the southern part of the Massif Armoricain, belongs to the North Gondwana margin. The Massif Central consists of a stack of nappes resulting of six main tectonic-metamorphic events. The first one, D0, is coeval with an Early Late Silurian (ca 415 Ma) high-pressure (or ultra high-pressure) metamorphism for which the...
International audience
International audience
Prospections des matières premières dans les massifs de l'Argentera et des Maures et premières expérimentations céramiques
During the Neogene, the internal arc of the Western Alps underwent extension behind its inverted Paleogene frontal thrust while shortening affected the external arc. In the core of the internal arc, doming of eclogite-bearing gneissic nappes has formed the Dora–Maira massif. The blueschist-bearing Schistes lustrés of Queyras, which overlie the...
Apports de la datation 40Ar/39Ar mono-grain pour l'étude des poteries
Etude des lames de hache du secteur Nord-Est
During the Oligocene, in the central western Alps, tectonic accretion of the external domain to the internal orogenic wedge along the Briançonnais Frontal Thrust (BFT) was followed by backfolding, resulting in the Alpine fanning structure. The Briançonnais fan axis was rapidly exhumed by erosion. This growing wedge at the scale of the entire...
This work presents petrologic data obtained from shielded mineral inclusions within large garnets from the Beni-Bousera metamorphic unit (internal Rif belt, northern Morocco) combined with in situ U‒Th‒Pb dating of monazite inclusions. In the considered Beni-Bousera metapelites, the occurrence of mineral inclusions of kyanite + rutile +...
In the Provence basin, south-eastern France, more than 230 Bottom Hole Temperature (BHT) data have been compiled and corrected for transient disturbances to provide a thermal model of this Mesozoic to Cenozoic sedimentary basin. The thermal gradient of the area averages 29.9°C/km (32.5°C/km in all France), but some places show gradients...