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Oceanic crust is the outer layer of Earth's lithosphere under the oceans, composed of basaltic lavas, dikes and gabbro. Learn about its layers, structure, composition and how it is formed and destroyed by plate tectonics.
Oceanic crust is the uppermost layer of the oceanic portion of the tectonic plates, composed of mafic rocks rich in iron and magnesium. It is created at mid-ocean ridges by cooling and crystallization of magma, and subducts at convergent boundaries with older crust or continental crust.
Oceanic crust is formed from mafic magma at sea-floor spreading ridges and consists of layers of basalt, gabbro, and peridotite. It is young, ranging from 0 to 280 Ma, and has various features such as seamounts, islands, and reefs.
1 Ιαν 2018 · Learn about the basaltic composition, formation and structure of the oceanic crust, the outermost solid layer of the lithospheric plates under the oceans. See diagrams and data of major and trace element variations in mid-ocean ridge basalts.
Oceanic crust is composed of dense rock, mainly basalt, and has distinct layers. Learn how oceanic crust is formed, recycled, and studied through the rock cycle and deep sea sediment.
24 Απρ 2024 · Oceanic crust is formed from mafic magma generated by decompression melting of mantle rock at sea-floor spreading ridges. It consists of layers of pillow basalts, gabbro, sheeted dykes, and ultramafic rock, and is covered with sedimentary rock and volcanic islands.
12 Οκτ 2013 · Ocean crust formation. Meyer explains that crust formation is a complex and dynamic process. He says that three-quarters of new ocean crust formed at fast-spreading ridges is composed of magmas crystallized within lower crustal settings.
