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熔结凝灰岩(Ignimbrite)是一种由火山爆溢作用形成的火山碎屑岩。它包括熔结凝灰岩、熔结角砾岩和熔结集块岩。因细粒级的熔结凝灰岩分布面积最广,堆积厚度最大,因而得名。以酸性、中酸性的多见,碱性及中性的次之,基性的最少。它广泛分布于大陆造山带,是一种典型的陆相火山碎屑岩。时代集中在侏罗纪、白垩纪,近年来在前震旦纪和古生代地层中也陆续有所发现。正确认识这种岩石,对研究火山作用性质,再造火山机构,阐明区域岩浆活动史以及探查有关矿产,都具有十分重要的意义。
Ignimbrite is a pyroclastic rock formed by the volcanic eruption. It includes tuff, sinter breccia and frit rock. Due to the fine-grained fused tuff is the most widely distributed, the largest accumulation thickness, hence the name. To acid, acid more common, alkaline and neutral second, the least of the basic. It is widely distributed in the mainland orogenic belt, is a typical continental volcano clastic rocks. Times concentrated in the Jurassic, Cretaceous, in recent years in the Pre-Sinian and Paleozoic strata have also been found. Correct understanding of this kind of rock is very important for studying the nature of volcanism, rebuilding volcanic institutions, clarifying the history of regional magmatic activities and exploring relevant minerals.