To model Tajiks, all 2-ways admixture models were excluded and we obtained one 3-ways admixture model (p-value = 0.49) implying around 17% ancestry from XiongNu, almost 75% ancestry from Turkmenistan_IA, and around 8% ancestry from a South Asian individual (Indian_GreatAndaman_100BP) representing a deep ancestry in South Asia.
Finally, we used DATES18 206 to estimate the number of generations since the admixture events. We obtained 35±15 generations for the admixture between Turkmenistan_IA and XiongNu-like populations at the origins of the Yaghnobis, i.e. an admixture event dating back to ~1019±447 years ago considering 29 years per generation. For Tajiks (TJE, TJY, TJA) we obtained dates from ~ 546 ±138 years ago (18.8± 4.7 generations) to ~ 907 ± 617 years ago (31.2 ± 21.3 generations) for the West/East admixture. We also obtained a date of ~944 ±300 years ago for the admixture with the South Asian population.
Looks like most of the admixture from the Indian subcontinent dates to the period around 1000 AD, when the Ghaznavids were enslaving large numbers of Indians. This ancestry shows up in Afghanistan and eastern Iran.