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pelite
Pelite (Greek ''pelos'', clay) is an old and currently not widely used field geological term for a clay rich fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone. It is equivalent to the Latin-derived term lutite. More commonly, metamorphic geologists currently use pelite for a metamorphosed fine-grained sedimentary rock, i.e. mudstone or siltstone, which should technically be called a ''metapelite.〔Potter, P.E., J.B. Maynard, and P.J. Depetris (2005) ''Muds and Mudstones.'' New York, New York, Springer. 279 pp. ISBN 978-3-540-22157-9〕〔Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. ISBN 0-922152-76-4〕
The term ''pelite'' is not to be confused with ''pilite'', a rarely used name for an altered olivine that has been partially pseudomorphically replaced by an assemblage of carbonate–chlorite–actinolite and can be identified only in a thin section.
Pettijohn (1975)〔Pettijohn, F. J. (1975), ''Sedimentary Rocks'', Harper & Row, ISBN 0-06-045191-2.〕 gives the following descriptive terms based on grain size, avoiding the use of terms such as clay or argillaceous which carry an implication of chemical composition. The Greek terms are more commonly used for metamorphosed rocks, and the Latin for unmetamorphosed:
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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