Blueschist - Wikipedia
网页Blueschist ( / ˈbluːʃɪst /), also called glaucophane schist, is a metavolcanic rock [1] that forms by the metamorphism of basalt and rocks with similar composition at high pressures and low temperatures (200–500 °C (392–932 °F)), approximately corresponding to a depth of 15–30 km (9.3–18.6 mi).
Emergence of blueschists on Earth linked to secular changes in …
网页2015年12月14日 · Blueschists are glaucophane-bearing metabasalts 5,6 that form at high-pressure–low-temperature (HP–LT) conditions in the Earth, typically along geothermal gradients of 150–400 °C...
Blueschist - an overview | ScienceDirect Topics
网页Blueschists and Ultra-High-Pressure Metamorphic Rocks. Blueschists are formed in association with subduction and continental collision and reflect burial to high pressures at relatively low temperatures (see Figure 2.10). It has long been recognized that blueschists older than about 1000 Ma are apparently absent in …
Blueschists, eclogites, and subduction zone tectonics: Insights …
网页2010年7月1日 · Blueschist (glaucophane schist) is a metamorphosed basaltic rock, characterized by glaucophanic amphibole as the major constituent mineral.
Blueschist : Compositions, Properties, Formation - Geology Science
网页2023年1月12日 · Blueschist is a type of metamorphic rock that forms under high-pressure, low-temperature conditions typically associated with subduction zones in tectonic plate boundaries. It is characterized by its distinctive blue color, which is attributed to the presence of minerals such as glaucophane, a blue amphibole.
Blueschists, eclogites, and subduction zone tectonics: Insights …
网页2010年7月1日 · Blueschist (glaucophane schist) is a metamorphosed basaltic rock, characterized by glaucophanic amphibole as the major constituent mineral. The representative mineral assemblages include glaucophanic amphibole + lawsonite (or epidote) + chlorite + albite + quartz ± sodic (jadeitic) clinopyroxene ± aragonite, and these assemblages in ...
Blueschist | rock | Britannica
网页marble, granular limestone or dolomite (i.e., rock composed of calcium-magnesium carbonate) that has been recrystallized under the influence of heat, pressure, and aqueous solutions. Commercially, it includes all decorative calcium-rich rocks that can be polished, as well as certain serpentines (verd antiques).
Blueschist: A window into high-pressure/low-temperature …
网页2020年7月20日 · Blueschist is a regional metamorphic rock formed under high-pressure (HP) low-temperature (LT) conditions. It is formed in the subduction zone environment with low geothermal gradients (4–14°C km −1), and is characterized by the presence of HP/LT index minerals like glaucophane, lawsonite, aragonite, jadeite, and deerite.
The Role of Blueschist Stored in Shallow Lithosphere in the …
网页2020年9月24日 · In regions with small ocean plates and continental blocks, such as the Mediterranean in the Cenozoic and modern Indonesia, many blueschists may be stored at shallow depth in the mantle lithosphere that is newly formed during the amalgamation of small continental blocks and oceans.
Blueschist - SpringerLink
网页2019年11月11日 · Blueschist is another name for glaucophane schist, which specifically refers to metamorphic rocks with minerals of glaucophane characteristics formed during high-pressure regional metamorphism. It has complex metamorphic mineral combinations and is characterised by the presence of glaucophane, magnesio-riebeckite, crossite, jadeite, jadeite ...