Volcanic caves mainly are lava tube type?pyrodastic type cave and volcanic-intrusive cave,with different genetic mechanism and high value of tourism.
火山洞穴主要是指火山熔岩型洞穴 ,除此之外 ,还有构造 -差异风化洞穴和火山侵入岩崩塌堆叠型洞穴。
It is consisted of basalt lava (including massive basalt,porphyritic basalt,and amygdaloidal basalt),py- roclastic-lava,volcanic breccia and tuff.
对中坝址出露地层进行分析,主要为峨眉山玄武岩系第三到第六岩性段,由火山熔岩类、火山碎屑熔岩类、火山碎屑岩类和沉积火山碎屑岩类所组成。
Junjianshan Formation was first introduced for the Neocene thick confined or unconfined basaltic lava flows around the Tianchi Cone and has been divided into three parts as, from early to late, Toudao F, Baishan F and Laofangzixiaoshan F,.
天池火山东北侧造盾玄武岩可划分出8个流动单元,熔岩流的流动距离主要集中在30~50km,熔岩流宽度以5km左右为主。
The quenching fragment lavas are distributed in the upper part of Sihetun layer,the middle of Zhuanchengzi layer and the upper of Dakangpu layer of Yixian formation.
通过近年在辽西北票-义县地区的研究,在该区首次发现了多处湖盆环境水下急速冷却机制形成的淬碎熔岩(不同于一般的枕状熔岩),这些淬碎熔岩分别与义县组中不同层位的沉积夹层伴生,其就位年龄应分别代表着相应沉积夹层的年龄。