Andesite - Wikipedia
Andesite is an aphanitic (fine-grained) to porphyritic (coarse-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and …
Andesite: Igneous Rock - Pictures, Definition & More - Geology.com
Andesite is the name of a family of fine-grained, extrusive igneous rocks that are usually light to dark gray in color. They have a mineral composition that is intermediate between granite and …
Andesite | Properties, Composition, Formation, Uses - Geology …
2023年9月4日 · Andesite is the volcanic equivalent of diorite. It consists of the plagioclase feldspar minerals andesine and oligoclase, together with one or more dark, ferromagnesian …
安山岩（中性的钙碱性喷出岩）_百度百科
安山岩（andesite）是中性的钙碱性喷出岩。 与闪长岩成分相当。 安山岩一词来源于南美洲西部的安第斯山名Andes。 分布于环太平洋 活动大陆边缘 及岛弧地区。 产状以陆相中心式喷发为 …
Everything You Ought to Know about Andesite Rock - Geology Base
2023年7月3日 · Andesite is a fine-grained, intermediate volcanic or extrusive igneous rock. Its composition lies between basalt and dacite, and it has mainly sodium-rich plagioclase and one …
Andesite | Volcanic, Igneous, Magma | Britannica
andesite, any member of a large family of rocks that occur in most of the world’s volcanic areas. Andesites occur mainly as surface deposits and, to a lesser extent, as dikes and small plugs.
Andesite Rocks: Identification, Characteristics, Pictures, and More ...
2024年3月13日 · Andesite rocks are volcanic rocks commonly found in volcanic arcs and island arcs. Their composition is intermediate, meaning they contain a balance of silica content …
Andesite - Geology Hub
2024年9月21日 · Andesite is a fine-grained volcanic rock (aphanitic texture) that forms through the rapid cooling of magma at the Earth’s surface. Its silica content ranges from 57-63%, …
Andesite - New World Encyclopedia
Andesite is a type of igneous rock that is found in most volcanic regions of the world, especially around volcanoes that line the Pacific Basin. Its main mineral components are plagioclase, …
Andesitic magma | geology | Britannica
Andesitic magma is intermediate in temperature (800–1,000 °C [about 1,470–1,830 °F]) and silica content. (See also felsic and mafic rocks.) Why some volcanic eruptions are more explosive …