Identify the factors that cause melting and thus the formation of magma. Choose one or more: A.addition of volatiles. B.heat transfer. C.crystallization. D.compression. E.decompression. F.rapid coolingDistinct Melting Events One possibility that always exists is that the magmas are not related except by some heating event that caused melting. In such a case each magma might represent melting of a different source rock at different times during the heating event. If this wereThe composition of magma depends on the rock it was formed from (by melting), and the conditions of that melting. Magmas derived from the mantle have higher levels of iron, magnesium, and calcium, but they are still likely to be dominated by oxygen and silicon.There are two main factors that can cause the conversion: heat, pressure. The presence of hydrothermal fluids at the time of transformation can also play a role in the resulting rock. Heat. Geothermal gradients in the earth caused by radioactive decay are the most common cause of temperature differences and thus a cause of metamorphism.When magma is extruded out of the earth's surface, it becomes lava or explosives that can do certain damage in surrounding areas. The factors that mainly affect in the formation of magma can be...
Magmatic Differentiation
The subducting material is saturated with sea water Mixes with the material and speeds up the melting process Steam rises into the overlying lithosphere and asthenosphere and causes the formation of vast quantities of magmaA key factor for magma saturation and volatile formation is the sulphide saturation in the original magma. High solubility and high concentration of sulphur in magma lead to high sulphide saturation and could be an important factor in formation of big ore deposits.Much of the planet's mantle consists of magma. This magma can push through holes or cracks in the crust, causing a volcanic eruption. When magma flows or erupts onto Earth's surface, it is called lava. Like solid rock, magma is a mixture of minerals. It also contains small amounts of dissolved gases such as water vapor, carbon dioxide, andThere are three principal ways rock behavior crosses to the right of the green solidus line to create molten magma: 1) decompression melting caused by lowering the pressure, 2) flux melting caused by adding volatiles (see more below), and 3) heat-induced melting caused by increasing the temperature.
3.2 Magma and Magma Formation - Physical Geology
Decompression Melting - Under normal conditions the temperature in the Earth, shown by the geothermal gradient, is lower than the beginning of melting of the mantle. Thus in order for the mantle to melt there has to be a mechanism to raise the geothermal gradient. Once such mechanism is convection, wherein hot mantle material rises to lower pressure or depth, carrying its heat with it.Identify the factors that cause melting and thus the formation of magma. Choose one or more: A. decompression B. rapid cooling C. compression D. addition of volatiles E. heat transfer F. crystallizationAs the rock heats, decompresses, or is infused with water, the minerals with the lowest melting point (more felsic) melt first and begin to move away from the source rock, so a magma is always somewhat more felsic than its source.Identify the factors that cause melting and thus the formation of magma. Choose one or more: A. decompression B. heat transfer C. crystallization D. compression E. addition of volatiles F. rapid coolingOrigin of magma. Rocks melt forming magma due to one of three factors or the combination of them, these factors are a decrease in pressure or addition of water or an increase in temperature. Decrease in pressure (decompression melting) Pressure increases with depth affecting the melting temperature of the rocks. Melting, which is accompanied by
0 comments:
Post a Comment