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Mantle (geology)

Layer inside a planetary-mass object

A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density. All terrestrial planets (including Earth), half of the giant planets, specifically ice giants, a number of asteroids, and some planetary moons have mantles.

Examples

Earth

The internal structure of Earth

Main article: Earth's mantle

The Earth's mantle is a layer of silicate rock between the crust and the outer core. Its mass of 4.01 × 1024 kg is 67% of the mass of the Earth. It has a thickness of 2900 km making up about 84% of Earth's volume. It is predominantly solid, but in geological time it behaves as a viscous fluid. Partial melting of the mantle at mid-ocean ridges produces oceanic crust, and partial melting of the mantle at subduction zones produces continental crust.

Other planets

Mercury has a silicate mantle approximately 490 km thick, constituting only 28% of its mass. Venus's silicate mantle is approximately 2800 km thick, constituting around 70% of its mass. Mars's silicate mantle is approximately 1600 km thick, constituting ~74–88% of its mass, and may be represented by chassignite meteorites. Uranus and Neptune's ice mantles are approximately 30,000 km thick, composing 80% of both masses.

Moons

Jupiter's moons Io, Europa, and Ganymede have silicate mantles; Io's ~1100 km silicate mantle is overlain by a volcanic crust, Ganymede's ~1315 km thick silicate mantle is overlain by ~835 km of ice, and Europa's ~1165 km km silicate mantle is overlain by ~85 km of ice and possibly liquid water.

The silicate mantle of the Earth's moon is approximately 1300–1400 km thick, and is the source of mare basalts. The lunar mantle might be exposed in the South Pole-Aitken basin or the Crisium basin. The lunar mantle contains a seismic discontinuity at ~500 km depth, most likely related to a change in composition.

Titan and Triton each have a mantle made of ice or other solid volatile substances.

Asteroids

Some of the largest asteroids have mantles; for example, Vesta has a silicate mantle similar in composition to diogenite meteorites.

References

Katharina., Lodders. (1998). "The planetary scientist's companion". [[Oxford University Press]].
(2016-03-26). "What is the Earth's Mantle Made Of? – Universe Today". [[Universe Today]].
Swindle, T. D.. (2002-01-01). "Martian Noble Gases". [[Reviews in Mineralogy and Geochemistry]].
Wieczorek, M. A.. (2006-01-01). "The Constitution and Structure of the Lunar Interior". Reviews in Mineralogy and Geochemistry.
(23 February 2012). "Layers of Titan". [[NASA]].
"Triton: In Depth". [[NASA]].
"Griffith Observatory – Pieces of the Sky – Meteorite Histories".
(2011-03-01). "First fragment of Asteroid 4 Vesta's mantle detected". Icarus.

Info: Wikipedia Source

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