Massif Armoricain
massif-armoricainMassif armoricain
https://fr.wikipedia.org/wiki/Massif_armoricainLa pointe de la Hague : Baie d'Ecalgrain et Anse du Cul-Rond. Trois orogenèses : icartienne, cadomienne et varisque.
http://geologie.discip.ac-caen.fr/precamb/lahagueEcalgrain/ecalgrain.htmLes orthogneiss icartiens de Port-Béni (Côtes d'Armor) : un affleurement des roches les plus anciennes de France métropolitaine
http://planet-terre.ens-lyon.fr/article/gneiss-icartien-Port-Beni.xmlÉtude du manteau
étude-du-manteauTwo models of mantle convection (whole convection & 2 layer convection) - 2003
Mantle transition zone cross section (410km & 660km boundaries)
Earth interior global cross section
Inferring Earth’s discontinuous chemical layering from the 660-kilometer boundary topography
Topography, or depth variation, of certain interfaces in the solid Earth can provide important insights into the dynamics of our planet interior. Although the intermediate- and long-range topographic variation of the 660-kilometer boundary between Earth’s upper and lower mantle is well studied, small-scale measurements are far more challenging. We found a surprising amount of topography at short length scale along the 660-kilometer boundary in certain regions using scattered P'P' seismic waves. Our observations required chemical layering in regions with high short-scale roughness. By contrast, we did not see such small-scale topography along the 410-kilometer boundary in the upper mantle. Our findings support the concept of partially blocked or imperfect circulation between the upper and lower mantle.
One interpretation of […] is very weak small-scale topography on a sharp 410-km discontinuity. This interpretation implies that the 410-km discontinuity is a *pure phase-transition boundary*, which only has topographic variations at large and intermediate scales mostly caused by smoothly changing thermal structures.
Small-scale topography of the 660-km boundary, or a less likely thin layer of volumetric heterogeneities, would best be explained with a *chemical origin* (and not only a phase transition). A gravitationally stable garnetite layer above the 660-km interface, due to oceanic crust accumulation from currently subducting and/or ancient slabs, is possible. Some regions lack small-scale topography of the 660-km interface, implying a globally discontinuous chemical layer. Our observations support simulations that describe subducting slabs as transient features of the transition zone, which eventually penetrate into the lower mantle. They also support a picture of partially blocked upper- to lower-mantle circulation.
Palette: Morphologie de cours d'eau
https://fr.wikipedia.org/wiki/Modèle:Palette_Morphologie_de_cours_d'eauDossier géographique sur les séismes, La Recherche, Septembre 95, p917
Large low-shear-velocity provinces
https://en.wikipedia.org/wiki/Large_low-shear-velocity_provincesPele's hair
https://en.wikipedia.org/wiki/Pele%27s_hairMaar
https://en.wikipedia.org/wiki/MaarThe Newer Volcanics Province (Australia)
https://theconversation.com/would-an-eruption-in-melbourne-really-match-hawaiis-volcanoes-heres-the-evidence-101675Why China's Largest Volcano Is So Unusual (not regular subduction volcanism, but probably the result of dehydratation of pacific oceanic plate stuck at the MTZ) - Deep Dive
Plate techtonics and life interacts : life may not be possible without plate techtonics (climate/carbon regulation, phosphorus cycle), and continents may not form without life (granite formation) - SciShow