摘要
象山县花岙岛南东侧的海岸带上出露柱状节理群火山地貌,因石柱的粗细、长短、色彩、趋向和所处位置的差异,相依相牵,顺坡层向上,构成阶梯式的山坡,是花岙岛的核心景点。柱状节理群形成于早白垩世,当炙热的碎斑熔岩经火山口侵出后,在区域不均匀冷却和缓慢收缩的条件下形成倾斜方向各异的柱状节理群,是火山岩的原生构造。
The volcanic landforms of columnar joint groups outcropped in the East - South side of coastal of Hua'ao is- land, Xianshan county town. These stone columns have an different diameters, length, color, tendency and position. They was dependent and structured stepwise hillside with layer upon layer along the slope. The hillside is the core feature spot of the Hua'ao island. The columnar joint groups were formed during the late pleistocene epoch. The mixed tuff lava were formed by the clastic and hot lava after the volcanic eruption. Because the composition of tuff lava were complicated, un- der the condition of inhomogeneous cooling and slow contraction, the columnar joint groups with different directions were formed, they were the original structure of extrusive rock.
出处
《资源环境与工程》
2013年第5期640-642,655,共4页
Resources Environment & Engineering
关键词
花岙岛
柱状节理群
火山地貌
古火山
Hua'ao island
columnar joint groups
volcanic landform
ancient volcano