Oceanic crust and its life cycle

crust is the uppermost layer of the oceanic portion of a Tectonic plate.

1. Oceanic Crust And Its Life Cycle

2. What is Oceanic crust? Oceanic crust  is the uppermost layer of the oceanic portion of a Tectonic plate. Oceanic crust is the result of erupted mantle material originating from below the plate, cooled by seawater. It is primarily composed of mafic rocks. Generally less than 10 kilometers thick.

3. Life cycle of oceanic crust

4. At mid-oceanic ridge Oceanic crust is continuously being created at mid-ocean ridges. As magma rises into the upper mantle and crust, the new crust formed move away from each other

5. At convergent boundary The oceanic lithosphere then subduct  at convergent boundary. The subduction process consumes older oceanic lithosphere. The subducted lithosphere than melt and rise up through continental crust and form island arcs. By the weathering, erosion, transportation, deposition, and lithification of these igneous rocks , sedimentary rocks are formed.

6. Than with the increase of temperature and pressure of sedimentary rocks due to increases of thickness of overburden, metamorphism occur. When temperature exceeded the upper-limit of metamorphism then melting occur, & magma is formed, which erupt at mid-oceanic ridges or from valcanoes