They are hypabyssal to subsurfac e intrusives and were folded during the Mesozoic time together with their sur rounding rocks.

• 研究表明，该区基性岩浆来源于过渡型地幔，主要通过部分熔融方式形成，在岩浆上侵过程中遭到陆壳或花岗质岩石的混染。