web stats origin of magma Archives - Geo Studies Organization

Tag «origin of magma»

Origin of the Igneous Rocks

We can find the mineral composition of igneous rocks by means of studying the chemical composition of the magma from which the rock has been crystallized. Because there is a large variety of igneous rocks, thus it was originally thought an equally large variety of magma also existed. But the later research found out that there are only two types of magma existed and all types of igneous rocks were derived from them.

Mechanics of Intrusion

Source of Magma:  Magma is originated from the upper mantle, which lies just under the crust, and is nearly molten. A slight drop in pressure caused by dee faulting etc, completes the melting process. The basaltic magma originates in this manner, while the “granitic magma” can be produced in two ways: (a) from melting of …

Volcanic Activity and Plate tectonics

According to the plate tectonic theory, there are three principal zones of volcanic activities: (i) spreading centers, (ii) subduction zones, (iii) regions within the plates themselves. Let us first study the origin of magma and its relations to plate tectonics. Origin of Magma: Basaltic Magma: Most basaltic magma is believed to originate in partially molten …