Novelty in Queen Pawn game

I have found an interesting move in the queen pawn game that has brought me some good results. I haven't been able to find it in the databases, so I'm assuming it's a novelty, although I may be wrong.

Anyway, the point is to respond to e6 with a3, entirely preventing black from playing Bb4 and pinning the knight. It's especially useful in a QGA, avoiding variations where black plays b5 because the bishop now has an escape square on h2, where he is still aimed at the kingside.

I'm not arrogant enough to think I have found a super-great opening move that no one else has ever thought of, but I can't see any refutation of it. Anyone?

Yes, that's it

interesting - but not a novelty. There are 160 Master games in Game Explorer with that position. In fact, there are two games of mine as black where we reached that position. In one I responded with 3. ... Be7 and in the other with 3. ... f5. I lost them both. At Master level the move is not quite so successul though.

I can't see a refutation, but it's a bit slow.  I would prefer black's position after 3... Nf6.  And with lots of pawns on light squares, black's dark bishop should find a number of useful positions, even if it can't pin white's queen's knight.