Basalt - Wikipedia
网页Basalt. Basalt (UK: / ˈbæsɔːlt, - əlt /; [1] US: / bəˈsɔːlt, ˈbeɪsɔːlt /) [2] is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low- viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of …
Basalt | Definition, Properties, & Facts | Britannica
网页2024年8月16日 · Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium. Basalts may be broadly classified on a chemical and petrographic basis into two main groups: the tholeiitic and the alkali basalts. Learn more about basalt in this article.
Basalt: Igneous Rock - Pictures, Definition, Uses & More - Geology.com
网页Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro.
Basalt | Properties, Formation, Composition, Uses - Geology Science
网页2023年4月23日 · Basalt is a mafic volcanic rock that forms from the solidification of basaltic magma and exhibits a characteristic fine-grained texture. Its composition, texture, and classification provide insights into the processes involved in its formation and the geochemical characteristics of the mantle and crust.
玄武岩 - 维基百科，自由的百科全书
网页玄武岩 （英語： basalt）是一種细粒致密、外觀呈黑色的 火成岩， 密度 約為2.8～3.3g/cm 3，由 基性岩漿 噴發凝結而成，主要成分是硅铝酸钠或硅铝酸钙， 二氧化硅 的含量大约是45-52%，还含有较高的 氧化铁 和 氧化镁。. 由于喷发时产生大量气孔，有时是大孔如 ...
A Guide to Basalt: A Common, Fine-grained, Dark-Colored …
网页2023年8月17日 · Basalt rock is fine-grained, dark-colored volcanic rock with essentially Mg-rich plagioclase and augite. It is basic or low in silica (42-52 wt. %) mafic (Mg- and Fe-rich) rock, with relatively low amounts of total alkalis (Na 2 O and K 2 O). To identify this rock in the field, consider its colors and texture.
Basalt: characteristics, formation, uses - ZME Science
网页2024年1月4日 · Basalt primarily forms in three key geological settings: Mid-Ocean Ridges: Here, basaltic lava emerges as the oceanic plates diverge, creating new oceanic crust. The process, known as ...
Basalt | Properties, Formation, Composition, Uses - Geology Hub
网页It is the most common rock type found in oceanic crust and is an important component of the Earth’s continental crust. Basalt is formed through the rapid cooling and solidification of magma at Earth’s surface, resulting in the formation of lava flows and volcanic rocks.
BASALT中文(简体)翻译：剑桥词典 - Cambridge Dictionary
网页The basalts have distinctive petrographic characteristics such as rounded and skeletal olivine phenocrysts with abundant melt inclusions, implying the mixing of two distinct magmas. 来自 Cambridge English Corpus
Basalt - Igneous rocks - Sandatlas
网页Basalt is the original constituent of the crust from which almost all other rock types have evolved. Basalt forms when mantle rocks (peridotite) start to melt. Rocks melt incongruently. It basically means that melt that forms has a different composition from the source rocks.