Matthew: as far as I can tell, no. There is only one instruction, which says before the nuptial blessing:

"Dicto Pater noster, sacerdos, antequam dicat Libera nos, quaesumus, Domine, stans in latere Epistolae versus sponsos ante altare genuflexos, dicit super eos sequentes orationes:"

The Missal seems to be composed mostly with low Mass in mind.

http://www.sanctamissa.org/en/resources/books-1962/missale-romanum-1962.pdf

I couldn't find anything about it in the Liber Usualis, either.

Here is one video of a solemn nuptial Mass where the blessing is sung (in the collect tone) at the 1:20 mark: https://www.youtube.com/watch?v=8bHaCFwlDXE

All other videos I've seen so far have it merely recited, which is odd for sung/solemn Mass if it is supposed to seen as an integral part of the liturgy itself (and it is), rather than an interruption. I asked if the preface tone ought to be used because the nuptial blessing is placed within what some would still call the Canon. After the Pater noster at a normal sung Mass, the priest still closes the "libera nos, etc." with the solemn ending and only returns to the collect tone at the Postcommunion.

I guess no one really thinks about these things, though.

Believe the OF nuptial blessing uses the Preface tone. The Portuguese version, though, uses a tone similar to Gloria XV.

tomjaw: I don't think such a thing as a fully notated Rituale existed before the Novus Ordo. If there was ever one, that is huuuuuuge (and good) news to me.

ClemensRomanus: ah, really? I'd be happy if someone could confirm that, just for future reference.

Jahaza: you may be right on a practical sphere. I certainly believe sung nuptial Masses were more common than that in the medieval ages of the Church, including even for the peasantry; but the Counter-Reformation period showed itself increasingly indifferent to the value of sung liturgy, leading ultimately to the situation you describe where sung Mass became the province of the elite.

Here is the OF Nuptial Blessing.

James,
I would say that having it sung in the collect tone makes sense. IF you wish it to be sung you can go that direction. Also, the Liber itself gives a lot of leeway into the tones at mass (more in some ways than the divine office {1962}) I would say that you are on the right track and really, even if it's not something that is common or even rarely done or even discouraged I'll call it what my pastor would say, "It's an abuse in the right direction".

I think the Preface tone is on the right track, IMO, considering the way it is used throughout the liturgy, e.g. at ordinations. The Easter Vigil chants might be the next place to go...

Officially speaking, this was an open question until recently. It has been clarified through a dubium sent to the CDF. For the full explanation and documentation, see: this post over at CCW.