Les changements d'Arda

[Erendis]

Après vérification, dans l'Ambarkanta, les quatre chaînes de montagnes apparaissent après la chute des Deux Lampes, tout comme les Montagnes de Fer :

Tolkien
But the pillars were made with deceit, being wrought of ice; and they melted, and the lamps fell in ruin, and their light was spilled.

[...]

And the thrusting aside of the land caused also mountains to appear in four ranges, two in the Northland, and two in the Southland; and those in the North were the Blue Mountains in the West side, and the Red Mountains in the East side; and in the South were the Grey Mountains and the Yellow. But Melko fortified the North and built there the Northern Towers, which are also called the Iron Mountains [...]

The Ambarkanta, HoMe IV

Pourtant, le Silmarillion (ch 1) donne : "In that time the Valar brought order to the seas and the lands and the mountains, [...] Aulë at the prayer of Yavanna wrought two mighty lamps for the lighting of the Middle-earth" 

Il y a bien des montagnes AVANT la chute des Lampes. Or, dans le genre "ordonnées" ces 4 chaines de montagnes (bleues, rouges, grises, jaunes), offrent une belle vision de symétrie. Alors, je suis d'accord qu'il n'est pas explicitement indiqué que Tolkien a changé d'avis et que les montagnes désignées dans ce passage du Siilmarillion soient ces 4 chaines, mais il me semblait que cela avait au moins valeur de bémol aux écrits de l'Ambarkanta