An old subduction zone with gold ores Today’s stage is the last long ride through the Armorican Massif. We now ride from south to north, perpendicular to the main structure of the massif, which is defined by large faults and … Continue reading →
The Armorican Margin: where Spain broke away Today’s stage again leads us through the Armorican Massif, but it starts at the south coast of Brittany, at what is known in geological literature as the ‘Armorican Margin’. To the southwest of … Continue reading →
The oldest rocks of France: 2 billion years About five kilometers west of the start of today’s stage, in the village of Trébeurden on the beack of Pors Raden, we find the oldest rocks of France: deformed and recrystallized granite … Continue reading →
Granites of the Armorican Massif The Tour de France 2021 starts in the ‘Armorican Massif’ that covers all of Brittany and Normandy. This represents an old, eroded mountain range that formed some 350-300 million years ago when two enormous continents … Continue reading →
https://www.nrc.nl/nieuws/2021/06/25/het-is-lekker-sprinten-in-sedimentaire-bekkens-a4048789
Continue reading →https://www.rtvutrecht.nl/nieuws/3093223/utrechtse-geoloog-bestudeert-etappes-van-de-tour-de-mont-ventoux-dat-is-een-rare-berg.html
Continue reading →scroll to 15 minutes: https://www.rtvutrecht.nl/gemist/uitzending/radiomutrecht/utrecht-komt-thuis/20210623-1800/
Continue reading →English: The subsurface of France contains a rock record that cover a history of mountain building, volcanism, and sedimentation of 2 billion years. The geology of France is roughly subdivided into three categories that coincide with the different types of … Continue reading →