The Caucasus region, one of the densest ethnic melting pot in the world, has long been an enigma for haplogroups. There were numerous studies (Wells et al. 2001, Nasidze et al. 2003 and 2004, Marchani et al. 2008) but all reported a lot of haplogroup F without testing for H or J1 (and indeed sometimes not even for G !), and K without testing for L or T. The same held true for Kurdistan. Fortunately a new study of the Caucasus by
Balanovsky et al. (2011) as well as an in-depth analysis of J1 by
Chiaroni et al. (2010) shed some light on the mystery. Most of the F that wasn't G was in fact J1, and most of it had nothing to do with the ubiquitous Arabic J1c3. The origin of J1 was placed in Kurdistan, around Lake Van.
You will find all the maps
here.
You will see that I have put a lot of effort in painstakingly delimiting the areas for each ethnic group in the Caucasus and colourised the map for each of them one by one for every haplogroup.
I removed all I2a from the Caucasus, not knowing if there was any, as it seems that most of the Middle Eastern I is just I* or I2* (except in Kurdistan and Turkey). I checked for clues on the regional projects on FTDNA, but I could only find a substantial number of I members in the
Armenian project, and out of 20 I's there was only one I2a2, but 14 I* or I2*. The 5 other members, very surprisingly, belonged to the Germanic I2b1c (P78+). I checked it up and noticed that this subclade was found all over Europe, from Russia to Ireland and to Spain, via Ukraine, Poland, Germany, France and Britain. It is also found in Greece and Turkey. I would be careful about the self-reported ancestry though since all five members were Armenians from Turkey (I would guess around Istanbul) or Crimea, not from Armenia itself. This probably explains everything (non-paternity event somewhere in the past). It also fits better with the distribution of I2b in regions settled by the Goths and Vikings.