暗色岩

岩漿的緩慢冷卻（無論是基石流還是濃稠的熔岩流）有時會在形成的暗色岩層內產生系統的垂直裂縫。這些裂縫通常通常形成六邊形的岩石柱，但也有四到八邊形的Muller, G. (1998) "Experimental simulation of basalt columns". Journal of Volcanology and Geothermal Research. vol. 86, no. 1–4, pp. 93–96Spry, A. (1962). "The origin of columnar jointing, particularly in basalt flows". Journal of the Geological Society of Australia. Vol. 5, pp. 191–216.。

參考資料

Category:火成岩学
Category:火成侵入體