I was thinking a bit on how to interpret the findings of the new Haber et al. preprint, and especially the idea that "29% of the Armenian ancestry may originate from an ancestral population best represented by Neolithic Europeans." I looked at the globe13 proportions, and strangely enough, I had estimated that the three Armenian samples (Armenian_D, Armenians, and Armenians_15_Y) have 28-29% of the Mediterranean component that is modal in Sardinians. This seems like a curious coincidence which has raised my confidence that Haber et al. is picking something real.

Looking back at my inferences of Armenian ancestry, it seems (according to globe13) to come completely from West_Asian, Mediterranean, and Southwest_Asian. The Mediterranean component seems real enough as it seems to match Sardinians/early European farmers well. I am not so sure about the Southwest Asian component which is modal in Yemen Jews and may represent population-specific drift in relatively recent Arabians. The West_Asian component is bimodal in Caucasus and Gedrosia, so it can't be the result of a very drifted population in either region (unless there is spooky action at a distance). 

Another curious finding is the lack of North_European in a latitudinal "column" of populations from the Yemen, through the Levant to the South Caucasus (Georgians and Armenians). It seems that North_European is the only one of the four major Caucasoid components that Armenians lack to any important degree. There is a rather abrupt change between the South Caucasus (~1%) and the North Caucasus (15-20%). It seems that the Greater Caucasus did act like a barrier to gene flow. The K=4 analysis of the same dataset that produced K=13 (globe13) also shows the same barrier: all three Armenian samples and Georgians have ~0% of "Amerindian" (which is surely correlated to "Ancient North Eurasian" ancestry and via it with North_European), but North Caucasians and Europeans have 4-10%.  It's clear that this influence did not cross the Greater Caucasus, as Armenians and Georgians lack it.