The Songshugou ultramafic pluton north of the Shangdan fault is the largest ultramafic body in the East Qinling Orogen and assumes the emplacement contract with the Qinling complex.

• 摘要松树沟超镁铁质岩体位于秦岭商丹断裂以北，是该地区出露最大的超基性岩体，以侵位方式与秦岭杂岩接触。