One type of metamorphic rock, one of the three major rocks refers to a new type of rock transformed by the internal force (temperature, pressure, stress changes, chemical composition, etc.).Under the pressure and temperature of the solid rock, under the pressure and temperature of the earth, the migration and crystallization of material components occur, forming a new mineral combination.For example, ordinary limestone becomes marble due to heavy crystals.
Formation of deterioration rocks
1. In contact with the deterioration effect, this refers to the deterioration effect caused by the contact band of the magma when the magma invasion is invaded.This is a local deterioration, which is limited to near the contact belt.The deterioration temperature is roughly 300-800 ° C, and the pressure is 0.2-3KB, which reflects the characteristics of high temperature and low pressure.Corner rocks are unique and common rocks in contact with metamorphic effects. They are generally lumpy. Mineral arrangements have no directionality. Typical corner rocks have no directional arrangement such as sheets and columnar minerals such as Yunmu and corner glitter.There are many types of corner rocks, including mud corner rocks, Changying -quality corner rocks and other types.2. Regional deterioration. This is the most widely distributed and most complicated deterioration. Generally, it has a relatively large scale. The distribution area can reach hundreds of hundreds, or even thousands of kilometers.High temperature and directional structure stress are the main factors in many factors in regional deterioration.Generally, the temperature range of deterioration is about 200-900 ° C, and the pressure is 3-12KB.The depth of the deterioration of the regional deterioration is different, and there are some differences in the metamorphic rocks formed, which are the most obvious in the degree of crystal crystallization and the characteristics of mineral combination.For example, the slate, thousands of rocks, sliced ??rocks, and semi -rocks are all regional metamorphic rocks. Due to the different degrees of deterioration, their crystallization degree gradually changes, from the crystal of the slate to the display of the sheetra, and the science began to appear on the film, and the item began to appear on the film.EssenceThe slices and hemp in the regional metamorphic rock are formed by the rock under the action of directional pressure. The rocks are sliced, and the minerals are roughly arranged in the direction of vertical pressure.Minerals appearing in spoiled rocks can reflect the deterioration of rocks. For example, when you see green mud, corner glitters, and pyroxyl in different rocks, you can roughly believe that they represent the shallow metamorphic, strong metamorphic to strong deterioration effects.Three indications minerals.
Features of deterioration rocks
The characteristics of metamorphic rocks are the most important points: the first is that the rock heavy crystals are obvious.The second is that the rock has a certain structure and structure, especially the pattern structure formed by the heavy crystallization of minerals under certain pressure.Compared with the fire -forming rock, although both have crystalline structures, the former often has typical deterioration minerals, and some have a science structure, while the latter does not have.The latter has a layered structure, which often contains biological fossils, while the former does not have. At the same time, except for chemical rocks and biochemical rocks in the sedimentary rocks, they generally do not have crystal granular structures.The degree of crystallization is different.
What are the metamorphic rocks
The types of metamorphic rocks can be divided into silicon strokes, corner rocks, hemp rocks, long-bonus granular rocks, gas-liquid-liquid change rocks, mixed rocks, thousands of rocks, hemp rocks, iron magnesium dark rocks, iron magnesium dark rocks, and iron magnesium dark rocks, iron magnestes, and iron magnesium dark rocks, iron magnestes, and iron magnesium dark rocks, iron magnesium rocks, iron magnesium dark rocks, iron magnestes, and iron magnesium dark rocks, iron magnestes, and iron magnesium.Guobi Rock, Dali Rock.

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