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Photo ID: 618
Gallery ID: 62 | Photo Title: Barranco de Tirajana, Gran Canaria, Canary Islands. | Purchase Images Digital Images:
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Keywords:
barranco de tirajana, gran canaria, canary islands, atlantic islands, volcanic islands, atlantic ocean, ocean, oceanic islands, canyon, barranco, gorge, columnar jointing, post roque nublo, nepheline-basanite, nepheline-basanite lava flow, ‘aa’ lava, lava flow, crystallize, contract, shrinkage, rock mass, microlites, plagioclase, pyroxenite nodules, |
Description:
Columnar jointing of a small post Roque Nublo, nepheline-basanite lava flow on the south western flank of the Barranco de Tirajana. The columnar jointing of a lava flow is formed as a lava flow cools and crystallizes into a coherent rock. As it begins to contract, shrinkage of the rock mass results in the development of numerous cracks, called joints. The rock is chemically a nephelinite, but contains microlites of plagioclase. Pyroxenite nodules are also to be found in this flow. |
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