Pillow Lavas Wadi Jizzi. Oman | #Geology #Discovery In the | Geology of the world and the Environment

Pillow Lavas Wadi Jizzi. Oman | #Geology #Discovery

In the Hajar Mountains of Oman, pillow lavas occur in what geologists call the Semail Ophiolite — a large slab of the oceanic crust and the underlying upper mantle that was uplifted and exposed above the sea level. Covering an area of approximately 100,000 square km, it is the largest and best exposed of its kind in the world.

Pillow Lavas found in the Hajar Mountains of Oman. Pillow lavas form when hot lava flows into water and cools rapidly forming a skin over the still molten rock. Underneath the skin, lava continues to flow forming a lobe, until the pressure of the magma becomes sufficient to rupture the skin and start the formation of a new lobe. This process produces a series of interconnecting pillow-shaped mounds of rock that look like toothpaste squeezed from a tube. Pillow lavas are found not only in the ocean but also under glaciers that overlie volcanoes. The presence of pillow lavas indicate that the area was once under water.

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