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Xierqu is a skarn Fe–Cu deposit associated with porphyritic diorite, in the Kalatag district of eastern Tianshan, China. The diorite yields a sensitive high‐resolution ion microprobe U–Pb zircon date of 391 ± 3 Ma interpreted as its age of emplacement. Major element geochemistry shows that the diorite is a calc‐alkaline assaying 16.7–19 wt.% of Al2O3, with Mg# values of 56.8–67.1, and Al2O3/(CaO + Na...
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