Found the reference to this interesting Y-DNA study at Dienekes. The paper itself, by Adams et al., is behind a paywall, but curiously enough the supplemental material is not. And there is where all the hard data is anyhow.
It's maybe one of the most comprehensive Y-DNA studies of Iberian (and Gascon) populations. After some work, I got the following distribution maps:
Nearly all R is R1b, with some R1b* at Valencia but mostly R1b3 (really old nomenclature, I know, but it's what the paper uses and does not mention the specific SNPs, so I'm follwing it here, much to my own displeasure). There's also some scattered R1a1 and even one R1* in Western Andalusia.
Within R1b3 most is R1b3* (if anybody is willing to compare the haplotypes, that would be an interesting thing to do and I'd love to hear from the results - overall, on first sight, they appear rather closely related anyhow). There are three SNP-defined subclades though:
- R1b3b, only found in the Basque Country (2 individuals)
- R1b3d, clearly stronger among Basque and Gascons and less important elswhere
- R1b3f, centered in Catalonia (other studies suggest Mid/Eastern Pyrenees) and somewhat more common in the peninsula, specially in the East
R1b becomes somewhat rarer to the SW but it is also oddly low in Asturias and Aragon. These two regions show some peculiarities regarding other clades too, what suggests that they have been affected by major demic movements at or after the Neolithic.
Neolithic or Celtic or both? Lacking clear data on what subclades are more common in each region is hard to judge. Overall other studies have suggested that the Iberian main clade is the same as that of the Balcans, what would suggest a Neolithic origin (Cardium Pottery) but hard to say without testing downstream SNPs.
Haplogroup I in Iberia is strongest at Aragon (a major Celtic hub in the Iron Age) but other locations appear to relate better with a Neolithic spread. The high presence in Galicia, Asturias and Extremadura could be explained by both prehistorical migrations.
Haplgroup E3b (now E1b1b).
While there are some E3b*, some E3b3 and even some E(xE3b), two clades appear dominant: E3b2 and E3b1. Not sure which is which (this nomenclature went obsolete long ago) but I think one correlates best with Greece/Albania and the other with North Africa. Nevertheless their distribution patterns are very similar, being both strong in the West specially.
Out of the Western Half, Valencia and Minorca appear significative in the East, what may relate to Neolithic founder effects.
While here is some scattered J(xJ2), most of the Iberian J is J2. This is a clearly Neolithic clade too, that must have originated in the Eastern Mediterranean, arriving with Cardium Pottery.
It's widespread but again the West (specially the SW, but also the enigmatic Asturias) appears unusually high.
This is another clade that must be original from West Asia (Neolithic). It appears strongest in Portugal and overall in the West. There are other areas, notably Catalonia, where this clade is also very important.
Described as K(xP), this clade must be T (formerly known as K2). It must be again a Neolithic clade and is strongest in Ibiza (Phoenician founder effect?).
And that's about all. Just to mention the two cases of Q(xQ3), found one in the Basque Country and the other in Andalusia that must be considered erratics of likely Anatolian origin (Neolithic).
Hope you like the maps.