What Is Decomposed Granite?
Granite (acid rock), K2O and Na2O content is also high, only MgO, FeO and CaO are lower. Therefore, iron-magnesium minerals are rare, usually only about 10%; quartz, alkaline feldspar, acid plagioclase and biotite symbiosis are common. [1] The term granitoid was originally used to refer to rocks similar to granite but with different compositions. Now commonly used as a synonym for granitic rocks, for temporary "wild" classification.
Granite
discuss
- Chinese name
- Granite
- Foreign name
- granitoid
- Meaning
- Granite containing silica at 65% ~ 78%
- Classification
- Granodiorite, quartz diorite
- Granite (acid rock), K2O and Na2O content is also high, only MgO, FeO and CaO are lower. Therefore, iron-magnesium minerals are rare, usually only about 10%; quartz, alkaline feldspar, acid plagioclase and biotite symbiosis are common. [1] The term granitoid was originally used to refer to rocks similar to granite but with different compositions. Now commonly used as a synonym for granitic rocks, for temporary "wild" classification.
- Granite
- It is a general term for granite, granodiorite, quartz diorite, quartz diorite, quartz syenite, etc. containing 65% ~ 78% of silica. It is generally characterized by the appearance of quartz and granite. Its genesis is formed by both magma and granitization. Granite rocks are widely distributed and often present as large complexes. Related minerals include tungsten, tin, beryllium, niobium, tantalum, rare elements, uranium, gold, lead, zinc and so on.
- Granite is a general term for igneous rocks with 65-78% SiO2 content. According to their alkali content, they can be divided into two subcategories of alkaline and calcium. Alkaline granites are characterized by alkaline feldspar and basic iron-magnesium minerals, such as amphibole granites and neonite granites, which are less distributed. Widely distributed are calcareous granites, which are divided into alkaline feldspar granite, normal granite (granite), granodiorite and plagioclase according to the proportion of alkaline feldspar and plagioclase. Generally speaking, granites are formed by magma and granitization. Granite porphyry can form quartz sericite and pyrite under the action of hydrothermal fluid. Under epigenetic action, the dark minerals in granite are decomposed, and feldspar becomes sericite or kaolin, which becomes a kaolin deposit, such as kaolin deposits in Jingdezhen, Jiangxi, China, and Dawu, Hubei. The granite-related minerals in China's major geological and historical periods and different structures include tungsten, tin, beryllium, niobium, tantalum, uranium, gold, lead, zinc, and rare elements. Granite rocks are widely distributed, often in large complexes.