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A pelite (from Ancient Greek πηλός (pēlós) 'clay, earth') or metapelite is a metamorphosed fine-grained sedimentary rock, i.e. mudstone or siltstone. The term was earlier used by geologists to describe a clay-rich, fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone, the metamorphosed version of which ...
Pelito (do grego πηλός, translit. pelós, 'lodo', 'argila') é uma rocha sedimentar detrítica clástica - isto é, formada com os fragmentos ou detritos oriundos da destruição de outras rochas - cujos componentes principais são minerais da granularidade das argilas e siltes e que se originam pela litificação de lamas.
Phyllite ( / ˈfɪlaɪt / FIL-yte) is a type of foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. [1] . It is primarily composed of quartz, sericite mica, and chlorite. [2]
The term pelite refers in a general sense to sedimentary protoliths that are fine-grained and dominated by clay. As the proportion of silt increases in the source rock, the metamorphosed equivalent is then commonly referred to as a semi-pelite, although there is no formal definition of when this lithological transition occurs (Bucher and Frey ...
8 de mai. de 2018 · pelite (adj. pelitic) An aluminium-rich, metamorphic rock formed by the metamorphism of clay-rich sedimentary rocks, e.g. shales and mudstones. The type of aluminium-bearing silicate minerals seen in the rock depends on the pressure and temperature of the metamorphism but usually includes one of the mica group minerals.
Properties. Perlite boulders with fireweed in foreground. Perlite softens when it reaches temperatures of 850–900 °C (1,560–1,650 °F). Water trapped in the structure of the material vaporises and escapes, and this causes the expansion of the material to 7–16 times its original volume.
2 de nov. de 2022 · Pelites (shales and mudstones) are arguably the most important rock type for interpreting metamorphism. Their significance derives from their widespread occurrence and the range of mineral assemblages they develop at different conditions of pressure and temperature.
