The Tarim-Urumchi mummies represent a people related to the Tokarians, Indo-European speakers. But other "Aryan" (bad name to use-- politically incorrect) peope have been found in both China and Mongolia/Siberia. The northeastern Iranian Scythians/Saka had ranged the steppes below the Altai, also far to the east.
In the movie Crouching Tiger, Hidden Dragon, you can see the remaining Caucasian in a bit actor during the Makla-Makan robbing scene. The guy has light brown hair and looks like an Irishman. The commentary by James Shamus refers to him as "the white guy."
The Urumchi people were Caucasians, but the Scythians/Saka were not totally (genetically) Europoids. A lot of Asian there.
I've been studying the relationships from the Cimmerians to the Alans and Taifali for about 10 years. I'm an Asian film buff, and I shoot steppe compound bows as a hobby, authentic ones made from sinew, horn, and fish glue. As a Roman Auxilliary reenactor, I assume the role of "Alanus" (my real name is Alan), a late 1st century Roxolanus in the Cohors I Pannoniarum. Hope to write a book about the Saka/Massagetae/Alans in the near future.
I hope to be helpful. You guys seem like a good bunch. ;D
Here's a little more about these Indo-Europeans who lived in Xinjiang Province.
Steve Shelby has located a nearly perfect early bow at the Urumchi Museum. It's of the oldest "cupid bow" type, the same as seen on Greek vases. See-- "Scythian-Style Bows Discovered in Xinjiang" by Dede Dyer; google Circle of Ancient Iranian Studies.
These people, the Tokarians, also went down into India and became acquainted with early monks who followed the teachings of Sakyamuni. They then brought Buddhism back into China.
There are good photographs in The Mummies of Urumchi by Elizabeth Wayland Barber. These include the mummies themselves, such as a blue-eyed baby, the plaids that are identical to Celtic ones found in the Halstadt salt mines, and a painting of a red-headed Tokarian with a Buddhist offering.
There are quite a few of their religious ms in Tokarian A, but they spoke a more "modern" Tokarian A. The Tokarians were called the Greater Yu-chi and Lesser Yu-chi by the Chinese. They moved into Sogdiana and were later known as the Kushans.
I was listening to the radio, and I heard that they found some burials in China that contained 3,000 old Aryan skeletons. Are these just Scythians? Or is there something more going on here?
I heard it mentioned that they contained genetic data that linked them to Eastern European Slavs.
It might be better to say, Eastern European Slaws might be linked to Tarim mummies, not vice versa. Eastern Slaws did appear much later and probably only a small minority of them came from the "original Slavic home". Par example, quite a lot of people switched to the Slavic languages since the Varyag empire of Rus (with capital city in Kiev) accepted the Byzantine Christianity as state ideology.