Back
Warrumbungle National Park
沃鲁姆邦格尔国家公园
Warrumbungle National Park
沃鲁姆邦格尔国家公园
About 17 mya, thick trachyte lava welled up from a number of vents over a wide area. About 16 mya, as the volcano aged, more fluid basalt lava flowed from new vents, alternating with ash and scoria explosions. The later flows filled the spaces between the earlier trachyte domes and built a large cone rising~1000m high and nearly 50km wide. Later, the magma became less viscous, spreading further from the vents and forming thick trachyte flows such as Mt Exmouth and Siding Spring Mountain. In the final stage from 14 mya, the flows became thinner, longer and more basaltic. Since the end of volcanic pile, exposing the early hard trachyte features.
大约一万七千年前，许多火山口喷发出大面积的粗面岩厚熔浆。一千年后，随着火山的老化，更多的液态玄武岩熔岩从新的火山口流出，其间交叉发生火山灰和火山渣喷发现象。之后流入的熔岩填满了早期粗面岩穹顶之间的空间，形成了一个高约1000米、宽约50公里的大圆锥体。之后流出的岩浆没有之前的那么粘稠，就从火山口进一步往外流动，形成了厚厚的粗面岩流，进一步形成了埃斯茅斯山和西定泉山等山峰。在一万四千年前的最后一段火山活跃期，岩浆变得更稀薄，流动的范围更远，玄武岩在其中的含量也越高。当火山不再喷发堆积物时，即展现出早期硬粗面岩特征。