A magma chamber is a large underground pool of molten rock lying under the surface of the earth's crust. In Geology, rock is a naturally occurring aggregate of Minerals and/or Mineraloids The Earth's outer solid layer the ‘ Lithosphere The molten rock in such a chamber is under great pressure, and given enough time and pressure can gradually fracture the rock around it creating outlets for the magma. Magma (Plurals magmas and magmata) is molten rock that sometimes forms beneath the surface of the Earth (or any other Terrestrial planet If it finds a way to the surface, then the result will be a volcanic eruption; consequently many volcanoes are situated over magma chambers. Plate tectonics and hotspots Divergent plate boundaries At the
Magma chambers are hard to detect, and most of the known ones are therefore close to the surface of the Earth, commonly between 1 km and 10 km under the surface. EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 In geological terms this is extremely close to the surface, although in human terms it is considerably deep underground. Geology (from Greek γη gê, "earth" and λόγος Logos, "speech" lit
Dynamics of magma chambers
Magma rises through fractures from beneath the crust because it is less dense than the surrounding rock. When the magma cannot find a path upwards it pools into a magma chamber. As more magma rises up below it, the pressure in the chamber grows.
If magma resides in a chamber for a long period, then it can become stratified with lower density components rising to the top and more dense materials sinking. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different It can also start to cool, with the higher melting point components such as olivine crystallising out of the solution, particularly near to the cooler walls of the chamber, and forming a more dense conglomerate of minerals which sinks. The Mineral olivine (when gem-quality also called Peridot) is a Magnesium Iron silicate with the formula ( Mg Any subsequent eruption may produce distinctly layered deposits, for example the deposits from the 79 AD eruption of Mount Vesuvius include a thick layer of white pumice from the upper portion of the magma chamber overlayed with a similar layer of grey pumice produced from material erupted later from lower down in the chamber. Year 79 was a Common year starting on Friday (link will display the full calendar of the Julian calendar. Mount Vesuvius (in Italian Monte Vesuvio and in Latin Mons Vesuvius) is an active Stratovolcano east of Naples Pumice is a textural term for a volcanic rock that is a solidified frothy lava composed of highly microvesicular glass Pyroclastic with very thin translucent
Another effect of the cooling of the chamber is that the solidifying crystals will release the gas (primarily steam) previously dissolved when they were liquid, causing the pressure in the chamber to rise, possibly sufficiently to produce an eruption. In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating Uses A Steam engine uses the expansion of steam in order to drive a Piston or Turbine to perform Mechanical work. Additionally, the removal of the lower melting point components will tend to make the magma more viscous (by increasing the concentration of silicates). For the Artificial intelligence Androids of the 1990s Science fiction series Space Above and Beyond, see Silicate (AI Thus, stratification of a magma chamber may result in an increase in the amount of gas within the magma near the top of the chamber, and also make this magma more viscous; potentially leading to a more explosive eruption than would be the case had the chamber not become stratified.
- Main article: Igneous differentiation
If the magma is not vented to the surface in a volcanic eruption it will slowly cool and crystalize at depth to form an intrusive igneous body composed of granite or gabbro (see also pluton). Igneous differentiation is an umbrella term for the various processes by which Magmas undergo bulk chemical change during the Partial melting process cooling In Geology, an intrusion is a body of Igneous rock that has Crystallized from molten Magma below the surface of the Earth. Igneous rocks (etymology from Latin ignis, fire are rocks formed by solidification of cooled Magma (molten rock Granite (ˈɡrænɪt is a common and widely occurring type of intrusive, Felsic, igneous rock. Gabbro (ˈɡæbrəʊ is a dark coarse-grained intrusive Igneous rock chemically equivalent to Basalt. A pluton in Geology is an Intrusive Igneous rock body that crystallized from a Magma slowly cooling below the surface of the Earth
Often, a volcano may have a deep magma chamber many kilometres down, which supplies a shallower chamber near the summit. The location of magma chambers can be mapped using seismology: seismic waves from earthquakes move more slowly through liquid rock than solid, allowing measurements to pinpoint the regions of slow movement which identify magma chambers. Seismology (from Greek grc σεισμός seismos, "earthquake" and grc -λογία -logia) is the scientific study of Earthquakes An earthquake is the result of a sudden release of energy in the Earth 's crust that creates Seismic waves Earthquakes are recorded with a Seismometer
As a volcano erupts, emptying the magma chamber, the surrounding rock will collapse into it. If a large amount of magma is erupted, causing the chamber to reduce considerably in volume, then this can result in a depression at the surface called a caldera. A caldera is a cauldron-like volcanic feature formed by the collapse of land following a volcanic eruption
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