The orogenic system to north is represented by the Hercynian Tianshan-Hinggan orogen that connects the Caledonian Altay Ergun orogen with sandwich of the Junggar and lli massifs in be t ween.

• 北造山系以天山-兴安岭华力西造山系的西段为主体，向北接有阿尔泰-额尔古纳加里东造山系，间有准噶尔、伊犁等微地块。