米易新街基性超基性岩体的底板由二迭纪玄武岩组成,四周也都被玄武岩包围。前者沿接触面常有所谓辉长辉绿岩的分布;后者关系不清。因此,新街岩体的成因也和攀(枝花)西(昌)地区其他含钒钛磁铁矿基性超基性岩的成因问题一样,有三种不同见解: The basement of the Miyi Xinjie basement ultramafic rock mass consists of Permian basalts and is surrounded by basalt all around. The former is often distributed along the contact surface of the so-called gabbro diabase; the latter relationship is unclear. Therefore, the genesis of the Xinjie pluton is also the same as that of other vanadium-bearing magnetite basic ultrabasic rocks in the Panzhihua (Changhua) area. There are three different opinions: