一种位于岛弧内的盆地，经含富火山碎屑的沉积物为典型。
A basin situated within an island arc and typically containing sediments rich in volcanic debris.
完整的斑状斑状橄榄石玄武岩和火山碎屑岩是最近火山活动的更新世的组成部分。
The holocrystalline porphyritic olivine basalts and pyroclastic rocks are the components of Pleistocene to recent volcanic activities.
在东部和东北部，冰川为尘埃和其他火山碎屑所覆盖，看起来是一种皱巴巴的棕色。
To the east and northeast, the glacier is covered by ash and other volcanic debris, giving it a rumpled, brown look.
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