Do you know that Sintashta R1A-Z93 is older than the Andronovo one?
And that early Andronovo samples are nearly identical with Sintashta samples?
I do know that Andronovo Presence is quite old in Adunqiaolu,Xinjiang.
But where is it said that East Andronovo is older than the west?
Regarding Mining and Metallurgy,that was not that intensive earlier and Pastoralism and Stockbreeding was much more dominant.
1. I think you already read the paper:
“The new data from Adunqiaolu fit well into the emerging view of the eastern Andronovo as shown by Frachetti and Mar’yashev (2007), Hanks et al. (2007), Panyushkina et al. (2008) and Molodin et al. (2012a), and which is gradually gaining wider acceptance (e.g. Doumani 2014). The earlier chronologies for the putative eastward spread of the Andronovo are clearly challenged, although mechanisms behind the transmission of general cultural influences remain unclear. The revised chronology supports new hypotheses on the nature of cultural connections (Frachetti 2013: 292) that replace the earlier explanatory models of long distance migration supported by Kuz’mina (1986, 1994, 2007, 2008) and others (e.g. Tkacheva & Tkachev 2008). The idea of ‘waves’ of eastward movement creating new regionalised ‘cultural clusters’ has been refuted, partly through emerging radiocarbon sequences as discussed above, but also through evidence for long-term localised regional development, such as that documented by Frachetti in Semirech’ye from at least the mid third millennium cal BC (Frachetti 2008).”
2. Another hurdle is anthropology: andronovo proper is a pamir type which cannot be a product of CWC or sintashta. Simlply see tarim skull:
First one is yamna/ afanasievo protoeuropid type, 2
nd one is andronovo proper type(very close to cromagnon, so paleo type), however, CWC/sintashta is genetically mixed with gracile farmer more.
http://racehist.blogspot.com/2010/08/two-old-papers-on-tarim-basin-mummies.html
“At the same time a
more massive type of Europoid (the so-called Pamir-Fergana or Andronovo type), predom-inated across most of Andronovo territory in the Urals, across all of Kazakhstan, in Fergana, and as far as the Sayan-Altay and Minusinsk Basin”
3. Another problem is how arsenic bronze survived in the territory of tin bronze seima turbino witch entered europe and china.
Sintashta outlier WSHG R1a/Z2103/Q1a could be related with seima turbino, and maybe to that andronovo R1a.
p.s
really in pain for posting, editing, replying in my account.