Components. The African Plate includes several cratons, stable blocks of old crust with deep roots in the subcontinental lithospheric mantle, and less stable terranes, which came together to form the African continent during the assembly of the supercontinent Pangea around 250 million years ago.
What are plates mostly made of?
Plates are rigid bodies of rock that essentially float atop a region of partial melt called the asthenosphere. The plates comprise the lithosphere, composed of the crust (which is the rigid, outermost layer of the Earth) and the solid portion of the upper mantle. … Continental crust is mostly of granitic composition.
How thick is the African plate?
The obtained crustal thicknesses range from 28 to 42km, with the thickest crust confined to the northern part of the West African Craton, the Kaapvaal craton, and the Congo cuvette.
Is the African plate convergent?
The African plate has two of these types of plate boundaries around its border. The northern part of the plate is a convergent boundary where the African plate is subducting below the Eurasian plate. Subduction zones are convergent boundaries, and where they collide, one plate dives below the other.
Is Israel on the African plate?
Israel is situated along the border between the African Tectonic Plate and the Arabian Tectonic Plate. The border between these two plates forms part of the Great Rift Valley, the world’s most extensive geological fault, which extends southward through eastern Africa as far south as Mozambique.
Is the African plate thick or thin?
Almost all diamond locations occur where the lithosphere is 175–200 km thick, but they are largely absent from the regions of the thickest lithosphere. The lithosphere is thin beneath the Pan-African terranes of northern Africa but appears to be thicker beneath the Pan-African Damara Belt in southern Africa.
Is Australia moving closer to Antarctica?
Over the next 100m years, the position of Australia moved steadily south, towards more temperate zones, and finally to the edge of the Antarctic Circle by roughly 270m years ago (seven minutes ago, in our geofilm). … Finally, about 150m years ago, Australia begins to slowly move back towards the equator.
Does the Horn of Africa have thick or thin plates?
South of the Red Sea Rift lies the massive, complex East African Rift. Throughout the East African Rift, the continent of Africa is splitting in two. The African plate, sometimes called the Nubian plate, carries most of the continent, while the smaller Somali plate carries Horn of Africa.