In the overlapped fault volcan ic basin there occurred extensive magmatic rock consisting of potassium_rich int ermediate_basic to alkaline volcanic rocks and lamprophyre.

• 在上叠构造断陷_火山盆地单元内，广泛分布幔源岩浆 岩，包括中基性到碱性的侵入岩、富钾火山岩和煌斑岩；