Stelvino
C'est bien cet événement !
Voici le lien du papier :
https://www.sciencedirect.com/science/article/pii/S0012821X10001305Si vous n'arrivez pas à télécharger le pdf, je l'ai sur mon ordi, je peux l'envoyer par mail ...
Notice pour la première série d'image :
Fig. 2. Scanning electron microscope images of the spherulitic aggregates (A to E: back-scattered electron mode; F: secondary electron mode). They consist of porous assemblages of unsorted, loosely bound, microscopic spherules up to 65 μm in diameter. A few silicate grains from the granitic bedrock occur interspersed within the aggregates (arrowed).
A) Particle #20c25 showing one sub-planar surface (top) likely representing an original external surface. B) A detail of one side of particle #20c.100 showing a very irregular surface, most likely a broken surface. C) A cluster of spherules showing dendritic textures on their external surfaces. D) A detail of a spherule showing a porphyritic texture on its external surface. E) A bedrock quartz grain embedded in the spherulitic aggregate (arrowed). F) Discontinuous, fine-grained sulfates (jarosite) encrust the spherules and provide binding material of the spherulitic aggregate.
Notice pour la seconde série d'image :
Fig. 3. Field emission-scanning electron microscope images of the sectioned spherulitic aggregates (back-scattered electron mode). A) Complete view of sectioned particle #20c.25 showing hundreds of quench-textured microscopic spherules and spherule fragments (arrowed) dominated by forsteritic olivine and magnesioferrite. B) A dendritic magnesioferrite spherule (DM-type). C) A olivine (grey) plus magnesioferrite (white) porphyritic spherule (POM-type). D) A fragment of a POM-type spherule. An albite crystal fragment from the bedrock is also featured at the lower right-hand corner. E) A feathered olivine spherule (FO-type). F) A cryptocrystalline spherule (CC-type). G) A barred olivine (grey) spherule (BO-type).
à toi