地壳板块;
Nd isotopic model ages of basement rocks suggested that the crustal age of Ili plate in the north ( 1.9Ga) is younger than that of the South Tianshan ( STS) fold belt in the south ( 2.2Ga).
本区北部伊犁地块基底岩石的Nd同位素模式年龄约为1.9Ga,南部南天山褶皱带的约为2.2Ga。
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