In nature, there are several varieties of rocks: sedimentary, igneous and metamorphic.All of them are compounds certain minerals.
In this article, we consider that such metamorphic rocks.We describe the types, characteristics and ways of use in industry.
But above all, it should tell you that such rocks.This term is used to refer to the chemical nature of the compounds which are formed in the crust.
Metamorphic rocks are the result of exposure to high temperatures and strong pressure on the resources of magmatic or sedimentary origin.Thus the chemical composition of minerals does not change significantly, but they acquire new texture and structure.
Many different metamorphic minerals Shale (the presence of fine slips).This characteristic indicates a method of forming mineral (under pressure).These resources have the ability to break into thin plates.
If the process of converting one into other minerals (metamorphism) occurs due to the heat of the intrusive masses in shallow water, in this case, the metamorphic rocks have rogovistuyu structure.An example of this are the hornfels (biotite, pyroxene, amphibolite), formed from clay.
of metamorphism (transformation) may be subjected to any resources - igneous, sedimentary or metamorphic origin.Any transformations made in the rocks by recrystallization of a solid.The degree of transformation of raw minerals can be very diverse, ranging from small modifications to significant rearrangements in the structure and shape of the fossil.The character of metamorphism is also different.It may happen only a small seal, or may complete recrystallization of the mineral.
all metamorphic rocks are inherently byproduct.Depending on the degree of conversion, there are several types of transient minerals:
- The contact.Arise as a result of the intrusion of magma (introduction in the earth's crust) and its interaction with sedimentary rocks.Minerals of this type are formed by pressure and heat.These include fossil marble and skarn, migmatite.The rocks of contact metamorphism are predominantly crystalline, massive, and saccharoidal slabosloistoe structure and the composition of minerals preperpevaet significant changes.
- Regional (deep).Process modification occurs at greater depths in the interaction of the high pressure, temperature and fluids.The mineralogical composition of the minerals in this case does not always change.Species differ in crystalline shale, tight structure.
- Dynamo metamorphism.The conversion process occurs in the tectonic plates under high pressure.In the variety of minerals produced strong crumple zones and complex folds.These fossils are mylonites and ka-taklazity.
metamorphic rocks usually occur naturally in the form of veins, strata and lenses.They often retain the original form of the mineral occurrence, but when exposed to intrusions of magma minerals can be irregular in shape.
metamorphic minerals are used worldwide as a decorative, building and ornamental material (quartz, marble, schist, gneiss).They are also used as industrial raw materials (asbestos, talc, etc.).The nature of the metamorphic rocks often located near mineral deposits of precious and semi-precious stones (ruby, emerald, jade, garnet, etc.).
