page_title: Piégut-Pluviers Granodiorite
section_title: Geological overview
hierarchical_section_title: Piégut-Pluviers Granodiorite / Geological overview
caption_attribution_description: English: The Piégut-Pluviers granodiorite transgressed by Liassic arkoses. La Bardinie quarry near Nontron, Dordogne, France.
context_page_description: The Piégut-Pluviers Granodiorite is situated at the northwestern edge of the Variscan Massif Central in France. Its cooling age has been determined as 325 ± 14 million years BP.
context_section_description: The Piégut-Pluviers Granodiorite is surrounded in the north, northeast and east by the Saint-Mathieu Leucogranite and its equivalents (SML on the geological map), which has a slightly younger age of 315 ± 17 million years BP (Pennsylvanian, Bashkirian). In the northwest and southeast 
  it is bordered by various paragneisses (unit P). Along the southwestern and western border the granodiorite is transgressed by liassic arkoses belonging to the sedimentary infill of the Aquitaine Basin. Together with the leucogranite the granodiorite forms a domal swell in the basement − the Saint-Mathieu Dome. The contact relationships with the paragneisses are not always clear-cut, sometimes there is a diffuse border region of several hundred meters where granodiorite and paragneiss interfinger. This indicates that the paragneiss is the host rock of the granodiorite and casts doubts on a truly intrusive origin.
  The western Massif Central is a nappe-stack of several basement slivers in the following spatial arrangement (from top to bottom):
  Upper Gneiss Unit (UGU)
  Lower Gneiss Unit (LGU)
  Parautochthonous Micaschist Unit (unit bo) containing the Saint-Mathieu Leucogranite (PMU)
  Piégut-Pluviers Granodiorite
  paragneisses (P)
  This arrangement is only spatial and does not reflect temporal relationships. Major thrust contacts are situated between the Parautochthonous Micaschist Unit and the Lower Gneiss Unit and in between the two gneiss units.
caption: Transgression of liassic arkose onto the eroded Piégut-Pluviers Granodiorite near Nontron
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