Ygorcs
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Do these results support the hypothesis of R1b moving from Anatolia through the Caucasus and taking CHG women, and then further moving up and taking some EHG women, with the Kura-Araxes expansion resulting in mainly J2 taking the R1b women (yeah, I know, Y DNA is only found in men) from the stage of R1b taking women in the Caucasus?
Because that's what I think happened. It could be the other way round, with K-A forcing the R1b guys upwards instead of just expanding from the power vacuum left by R1b moving upwards.
I could also be completely wrong, but I'm just trying to model in two things I see as very likely: R1b coming from (Eastern) Anatolia, and the Kura-Araxes picking up R1b-like ancestry.
That isn't very likely because of dating. Even before 4000 BC (the rough time of Kura-Araxes and Maykop was began in the 4th milennium BC, so a bit later) the CHG component and the R1b haplogroup was already found in the steppes. That migration from the Caucasus to the steppes could've happened, but it would've happened in an earlier historic context (not with Kura-Araxes, Yamnaya and Maykop so on), and you'd have first to establish what autosomal ancestry was mainly found in those R1b males, because if they were autosomally different, then they took CHG women and mixed with them and then they arrived in the steppes and took EHG women, then we certainly wouldn't expect the Chalcolithic steppe to be almost entirely EHG+CHG, as if the autosomal contribution of those R1b men had simply vanished completely. Unless, of course, the "R1b men" were just a small minority (but if they were then why are almost all the steppe males R1b? Not very likely IMHO), or they were already fully CHG just like the CHG women they took before moving into the steppes. In any case, if I were you I'd look for earlier Neolithic cultures, not those of the Copper Age and Early Bronze Age. The real "boom" of CHG in the steppes doesn't look to be that comparatively recent.