YANSHAN AND GAOSHAN VOLCANOES IN THE DAXINGAN MOUNTAIN RANGE-A NEW ERUPTION STYLE
YANSHAN AND GAOSHAN VOLCANOES IN THE DAXINGAN MOUNTAIN RANGE-A NEW ERUPTION STYLE
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发表时间：
2010
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通讯作者：
Fang Qi-Cheng
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作者：
Fang Qi-Cheng
燕山和高山是哈拉哈河和潮尔河火山群中的两座全新世火山，与Strombolian喷发的火山不同，其早期喷发产生火山碎屑，形成火山渣锥、火山灰落片和小规模火山碎屑流，而晚期喷发则喷出大量熔岩，火山渣锥较大，海拔在200~300 m以上，火山锥由火山灰锥和飞溅锥组成，火山灰落片围绕火山锥，两座火山喷出的熔岩流经历了从帕霍埃熔岩到AA熔岩的熔岩类型转变，根据火山产物的特征，火山喷发类型如下：具有持续喷发柱的爆发性喷发，斯特龙博利式喷发，熔岩喷泉喷发，持续喷发柱是新喷发样式的特征，使其区别于典型的斯特龙博利式喷发，燕山、高山火山分别位于龙岗第四纪火山群和镜泊湖全新世火山群中，是我国陆相火山作用中一种新的喷发样式。
Yanshan and Gaoshan,two Holocene volcanoes in the Halaha River and Chaoer River volcanic cluster,are different from volcanoes with Strombolian eruption.Their early-stage eruptions produced pyroclasts which formed scoria cone,tephra fall-out sheet and small-scale pyroclastic flow,while the late stage eruptions effused a great amount of lava.They have large cones with the elevation above 200～300 meters,and the cones are made up of cinder cone and spatter cone.Tephra fall-out sheet is around the cones.The effused lava flow from the two volcanoes underwent the lava type transition from pahoeoe lava to aa lava.According to the characteristics of volcanic products,the eruption style is presented as follows:explosive eruption with a sustained eruption column,Strombolian eruption,lava fountain eruption.The sustained eruption column characterizes the new style and makes it different from typical Strombolian eruption.The similar eruption as Yanshan and Gaoshan happened in Longgang Quaternary volcanic cluster and Holocene volcanic cluster in Jingbohu.It is a new eruption style in the continental volcanism in China.