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Pellets are small spherical to ovoid or rod-shaped grains that are common component of many limestones. They are typically 0.03 to 0.3 mm long and composed of carbonate mud (micrite). Their most common size is 0.04 to 0.08 mm. Pellets typically lack any internal structure and are remarkably uniform in size and shape in any single limestone sample. They consist either of aggregated carbonate mud, precipitated calcium carbonate, or a mixture of both. They either are or were composed either of aragonite, calcite, or a mixture of both. Also, pellets composed of either glauconite or phosphorite are common in marine sedimentary rocks. Pellets occur in Precambrian through Phanerozoic strata. They are an important component mainly in Phanerozoic strata. The consensus among sedimentologists and pet

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  • Pèl·let (petrologia) (ca)
  • Pellet (géologie) (fr)
  • Pellets (petrology) (en)
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  • Els pèl·lets són petits grans de forma esfèrica a ovoide o grans en forma de vareta que són components comuns de moltes pedres calcàries. Típicament fan de 0,03 a 0,3 mm de llarg i estan composatsde fang carbonatat (micrita). Són de mida i forma remarcablement uniforme en una mostra de pedra calcària. Consten de ja sia agregats de fang carbonatat, carbonat de calci precipitat o una mescla d'ambdòs. Poden estat d'aragonita, calcita o una mescla dels dos. En roques sedimentàries marines també presenten glauconita o fosforita. Es troben en estrats del Precambrià al Fanerozoic. Es creu que els pèl·lets són productes fecals d'invertebrats. (ca)
  • Pellets are small spherical to ovoid or rod-shaped grains that are common component of many limestones. They are typically 0.03 to 0.3 mm long and composed of carbonate mud (micrite). Their most common size is 0.04 to 0.08 mm. Pellets typically lack any internal structure and are remarkably uniform in size and shape in any single limestone sample. They consist either of aggregated carbonate mud, precipitated calcium carbonate, or a mixture of both. They either are or were composed either of aragonite, calcite, or a mixture of both. Also, pellets composed of either glauconite or phosphorite are common in marine sedimentary rocks. Pellets occur in Precambrian through Phanerozoic strata. They are an important component mainly in Phanerozoic strata. The consensus among sedimentologists and pet (en)
  • En géologie, un pellet (ou pelletoïde) est un type d'allochèmes (grains ou éléments figurés) présents dans les roches carbonatées. Dans la classification de Folk, les pellets sont un des quatre types de grains que l'on rencontre dans les calcaires avec les , les ooïdes et les bioclastes. Le mot pellet est emprunté à l'anglais (« pastille, boulette, pilule »). Les pellets font partie des péloïdes ; ils en diffèrent toutefois en ce que les pellets ont une taille, une forme et une origine implicite spécifique ; tandis que les péloïdes sont des allochèmes de toute taille, structure ou origine. (fr)
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  • Els pèl·lets són petits grans de forma esfèrica a ovoide o grans en forma de vareta que són components comuns de moltes pedres calcàries. Típicament fan de 0,03 a 0,3 mm de llarg i estan composatsde fang carbonatat (micrita). Són de mida i forma remarcablement uniforme en una mostra de pedra calcària. Consten de ja sia agregats de fang carbonatat, carbonat de calci precipitat o una mescla d'ambdòs. Poden estat d'aragonita, calcita o una mescla dels dos. En roques sedimentàries marines també presenten glauconita o fosforita. Es troben en estrats del Precambrià al Fanerozoic. Es creu que els pèl·lets són productes fecals d'invertebrats. Els pèl·lets difereixen dels oòlits i intraclasts, els quals també es troben en les pedres calcàries. Difereixen dels oòlits en què els pèl·lets no tenen estructures radials o concèntriques. Difereixen dels intraclasts en què els pèl·lets no tenen una estructura interna complexa. (ca)
  • Pellets are small spherical to ovoid or rod-shaped grains that are common component of many limestones. They are typically 0.03 to 0.3 mm long and composed of carbonate mud (micrite). Their most common size is 0.04 to 0.08 mm. Pellets typically lack any internal structure and are remarkably uniform in size and shape in any single limestone sample. They consist either of aggregated carbonate mud, precipitated calcium carbonate, or a mixture of both. They either are or were composed either of aragonite, calcite, or a mixture of both. Also, pellets composed of either glauconite or phosphorite are common in marine sedimentary rocks. Pellets occur in Precambrian through Phanerozoic strata. They are an important component mainly in Phanerozoic strata. The consensus among sedimentologists and petrographers is that pellets are the fecal products of invertebrate organisms because of their constant size, shape, and extra-high content of organic matter. Pellets differ from oolites and intraclasts, which are also found in limestones. They differ from oolites in that pellets lack the radial or concentric structures that characterize oolites. They differ from intraclasts in that pellets lack the complex internal structure, which is typical of intraclasts. In addition, pellets, quite unlike intraclasts, are characterized by a remarkable uniformity of shape, extremely good sorting, and small size. By definition, pellets differ from peloids, in that pellets have a specific size, shape, and implied origin—while peloids vary widely in size, shape, and origin. Pellets, in the strict sense, are fecal products of invertebrate organisms. Peloids are allochems of any size, structure, or origin. As a result, peloids not only include possible pellets, but also include a variety of other distinctly non-pellet grains—such as indistinct intraclasts, micritized ooids, or fossil fragments. In addition, some peloids are even microbial or inorganic precipitates. Carbonate geologists consider the vast majority of peloids as secondary allochems created by biological degradation or “micritization” of other primary carbonate grains, i.e., ooids, bioclasts, or pellets. (en)
  • En géologie, un pellet (ou pelletoïde) est un type d'allochèmes (grains ou éléments figurés) présents dans les roches carbonatées. Dans la classification de Folk, les pellets sont un des quatre types de grains que l'on rencontre dans les calcaires avec les , les ooïdes et les bioclastes. Le mot pellet est emprunté à l'anglais (« pastille, boulette, pilule »). Les pellets sont en forme de petits grains sphériques, ovoïdes ou en forme de tiges qui sont les composants communs à de nombreux calcaires. Leur diamètre est inférieur à 0,2 mm, il est généralement compris entre 0,04 et 0,1 mm. Ils sont constitués soit de boue carbonatée agrégée, soit de carbonate de calcium précipité, soit d'un mélange des deux et contiennent souvent des matières organiques d'origine fécale d'organismes invertébrés. Si le diamètre des pellets dépasse les 2 mm, ils sont reclassés dans le groupe des intraclastes. Les pellets font partie des péloïdes ; ils en diffèrent toutefois en ce que les pellets ont une taille, une forme et une origine implicite spécifique ; tandis que les péloïdes sont des allochèmes de toute taille, structure ou origine. (fr)
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