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Blueschist on Île de Groix, France Photomicrograph of a thin section of blueschist facies metamorphosed basalt, from Sivrihisar, Turkey. Blueschist (/ ˈ b l uː ʃ ɪ s t /), 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 ...
Greenstones, aside from containing basalts, also give rise to several types of metamorphic rocks which are used synonymously with 'metabasalt' et cetera; greenschist, whiteschist and blueschist are all terms spawned from the study of greenstone belts. The West African early Proterozoic greenstone belts are similar to the Archean greenstone belts.
The greenstone belts of the various Archean cratons are commonly altered to the greenschist facies. These ancient rocks are noted as host rocks for a variety of ore deposits in Australia, Namibia and Canada. Greenschist-like rocks can also be formed under blueschist facies conditions if the original rock contains enough magnesium.
Belts have been documented as male clothing since the Bronze Age. Both sexes have used them off and on, depending on the fashion trends. In the western world, belts have been more common for men, with the exception of the early Middle Ages, late 17th century Mantua, and skirt/blouse combinations between 1901 and 1910.
Sansabelt is a brand of men's trousers. The trousers have a wide webbed elastic band sewn into the waist, which is intended to make a belt or suspenders unnecessary, hence the name sans a belt. The slacks come in a classic fit with roomy legs in a dressy or dress casual fabric.
The mélange zones in the Franciscan usually have a block in matrix appearance with higher grade metamorphic blocks (blueschist, amphibolite, greenschist, eclogite) embedded within the mélange matrix. [16] The matrix material of the mélanges are mudstone or serpentinite. Geologists have argued for either a tectonic or olistostormal origin. [17]