répartition des sédiments


  • Comment sont répartis les sédiments ?

    Les sédiments se superposent donc du bas (les plus anciens) vers le haut (les plus récents). Ce principe de superposition permet d'expliquer la présence de couches dans les terrains sédimentaires, ainsi que les variations de couleur et de nature. Le dépôt des sédiments se fait dans un milieu de sédimentation.
  • Quels sont les différents types de sédiments ?

    On distingue la sédimentation marine (littorale ou côtière, océanique, bathyale, abyssale, etc.), la sédimentation lagunaire (dans des zones séparées de la mer par un cordon littoral), la sédimentation continentale (éolienne, fluviatile, deltaïque, lacustre, glaciaire, etc.).
  • Quels sont les 3 types de roches sédimentaires ?

    Les roches sédimentaires constituent une famille d'une grande diversité d'aspect. Les plus courantes sont les grès, les calcaires ou les charbons. Elles peuvent être meubles (sable) ou consolidées (grès).
  • Les étapes qui conduisent à la formation des roches sédimentaires sont: l'altération superficielle des roches qui produit des particules; le transport de ces particules par l'eau, le vent ou la glace; la sédimentation, ou le dépôt, des particules pour former un sédiment et, finalement, la diagenèse qui va transformer
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