Exploration is a far better fit given that Iceland had little to do with the raiding, but everything to do with Greenland and Vinland.
And was settled partly due to Religion, the other Exploration Age motif.
I'm currently reading a new book,
Embers of the Hands, a compilation of material on the 'Vikings' that emphasizes all the non-Viking elements: role of women, trade, religion, culture, crafts, etc. From the start the book makes it clear that everything we think we know about Scandinavia before about 700 CE is strictly archeological: there isn't even evidence of Runes, let alone any other 'historical' material other than that implied by works written 500 - 700 years later by Post Viking Scandinavian Christians.
Which makes a 'real' Antiquity Norse/Norn/Scandinavian Civ very, very difficult. Not completely Impossible, but one which will inevitably include a lot of later material 'back-dated' to fit.
Since, by comparison, we do have a lot of contemporary historical (mostly by Greeks and Romans, admittedly) as well as archeological material for the Antiquity Age German and Celtic groups, even including such specific groups as Britons, Picts, Gauls, Goths, etc. I suspect that a future 'north European' Antiquity Civ might be from one or more of those groups rather than the much hazier Scandinavian possibility.
Not saying it's certain, because, as stated, they've gone outside the strictly chronological to find fits elsewhere, but where there are chronologically appropriate groups related in various ways to their Exploration Age successors why twist the game in knots to do it the hard way?