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The lower mantle, historically also known as the mesosphere, represents approximately 56% of Earth's total volume, and is the region from 660 to 2900 km below Earth's surface; between the transition zone and the outer core. [1]
30 kwi 2024 · The mantle is the mostly solid bulk of Earth’s interior. The mantle lies between Earth’s dense, superheated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84 percent of Earth’s total volume.
Earth's upper mantle is divided into two major rheological layers: the rigid lithosphere comprising the uppermost mantle (the lithospheric mantle), and the more ductile asthenosphere, separated by the lithosphere-asthenosphere boundary.
Perovskite silicates (e.g. Bridgmenite, \((Mg,Fe)SiO_{3})\) are thought to be the main component of the lower mantle, making it the most common mineral in or on Earth. The mesosphere, sometimes known as the lower mantle, is more rigid and immobile than the asthenosphere.
1 sie 2023 · Below the asthenosphere and extending to about 2,900 km is the mesosphere or lower mantle. The mesosphere is a region of strong, rigid rocks that deform slowly under the intense heat and pressure. It’s composed of silicate minerals that change in structure with depth due to increasing pressure.
15 lut 2021 · Mesosphere (or Lower Mantle) This region is a rigid layer between the depths of about 400 to 1800 miles (650 km and 2900 km), but the rocks at these depths are very hot and capable of gradual flow. Heat from the core drives mantle gravitational convection.
29 sie 2023 · This Review describes modern isotopic methods used to characterize plume-derived basalts and gain insight into the composition of the mantle.
