Asha Serkis

If the magma rises towards the surface, it will form intrusive rocks, but if it falls inside, it will form molten rocks. When it cools, it forms volcanic or effusive rocks, which are terms in disuse.

The most common types of magma are basaltic, andesitic, and granitic.

According to its mineral composition, magma can be classified into two groups: mafic and felsic. The felsic and mafic magmas have similar contents of magnesium and iron.

The composition of magmas can vary depending on several processes.

The temperature at which the rich in silica begin to form varies between 700 and 900 C, while the poor start to form between 1,200 and 1,300 C.

The solidus point is the temperature at which a rock begins to melt, and the liquidus point is the temperature at which fusion is complete.

Water and a decrease in pressure can lower the solidus and liquidus points of a rock, facilitating the formation of magmas without increasing the temperature

Due to the effect of hot spots, 80% of the magmatism occurs at the constructive edges of the plates.

There have been at least three magmatic super events in the history of the planet. The oldest and most intense is in the Neoarchaic, followed by another 1,900 Ma in the Orosirian and the third 1,200 Ma on the ectasic-sthenic limit.

In each of them, large basaltic plateaus would have formed, which would have contributed to the increase of the continental mass.

To explain these superevents, some authors, such as the tectonicist Kent Condie in 1998, have proposed that the mechanism would have been produced by gigantic gravitational avalanches of material from the upper mantle and crust, which would fall from the upper mantle boundary. with the lower one (670 km deep) to the very limit of the outer core (about 2,900 km from the surface), crossing the entire lower mantle (about 2,230 km thick). As a result, many disturbances would form in the form of mantle that would give rise to the magmatism.

The 888-269-5556 888-269-5556s of the mantle would be the result of the physical changes of the fragments of the mantle that have been subducted up to 700 km deep. The mass of lithosphere that has subducted, up to 100 km thick and colder than the mantle that surrounds it, may take several million years to reach the temperature that facilitates, together with the greater pressure of these levels, the densification of the minerals that compose it (transition from peridotites to eclogites). The collapse of the core would occur when the density of the subducted mass becomes unstable.

Each repetition of the cycle would be less intense than the previous one, since each event involves a significant loss of heat in the mantle. This mechanism could explain the magmatism peaks from the end of the Paleozoic, about 300 Ma, and from the middle Cretaceous, about 100 Ma.

The cooling of the magma resulted in the formation of the igneous rocks. The rocks can be coarse or fine.

The place of cooling and crystallization affects the division of the rocks.

The original magma is divided into:

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