When oceanic crust is first formed at mid-ocean ridges, it is hot and thin. Oceanic crust: Found beneath the deep ocean basins, this crust is composed of basalt and gabbro.
Thermal Structure and Composition of Oceanic Plates
While the term plate might suggest a uniform slab, these structures are complex, stratified systems with distinct chemical and mechanical properties. Plates are broadly categorized into two types based on their surface geology and density.
Plate Type Primary Crustal Rock Primary Mantle Rock Key Minerals. A tectonic plate is not a shallow skin; it is a thick, rigid slab that extends down to the base of the lithosphere.
Thermal Structure and Composition of Oceanic Plates
The composition remains largely basaltic and peridotitic, but the physical state changes from a flexible layer to a strong, rigid lid capable of supporting the weight of continents or resisting the pull of subduction. Chemical Composition and Mineralogy Looking at the specific chemistry reveals a consistent pattern.
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