穹状火山（dome shaped volcano）指火山锥外形如穹窿状的火山。是火山喷出极黏稠的熔岩，堵塞在火山口内，并聚集膨胀，因而形成穹状外形，内部则常可见流动构造。
它也是在一个火山穹丘硬化和逐步侵蚀中，剥离出洋葱状岩石层形成的。
It formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock.
尽管它看起来像是一个陨石撞击坑，它是在一个火山穹丘硬化和逐步侵蚀中，剥离出洋葱状岩石层的结果。
Although it resembles an impact crater, it formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock.
结合台马碎斑熔岩与周边火山岩、侵入岩、地层的关系，认为它是早—中三叠世中心裂隙式火山构造中央部位侵出的穹状岩脊。
Combined with the surrounding volcanic rocks, intrusive rocks and strata, the Taima rock body is considered as a dome of the central part of the central fissure type volcanic structure.
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