Arenite (from the Latinarena, "sand")[1] is a sedimentaryclastic rock with sand grain size between 0.0625 mm (0.00245 in) and 2 mm (0.08 in) and containing less than 15% matrix.[2] The related adjective is arenaceous. The equivalent Greek-derived term is psammite, though this is more commonly used for metamorphosed sediments.
Arenite
Since it refers to grain size rather than chemical composition, the term is used for example in the classification of clastic carbonatic limestones, as the granulometrically equivalent term sandstone is not appropriate for limestone. Other arenites include sandstones, arkoses, greensands, and greywackes.
Arenites mainly form by erosion of other rocks or turbiditic re-deposition of sands. Some arenites contain a varying amount of carbonatic components and thus belong to the rock-category of carbonatic sandstones or silicaticlimestones. Arenites often appear as massive or bedded medium-grained rocks with a middling- to wide-spaced preferred lamination and often develop a pronounced cleavage.
Pettijohn[3] 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:
arenite, from, latin, arena, sand, sedimentary, clastic, rock, with, sand, grain, size, between, 0625, 00245, containing, less, than, matrix, related, adjective, arenaceous, equivalent, greek, derived, term, psammite, though, this, more, commonly, used, metamo. Arenite from the Latin arena sand 1 is a sedimentary clastic rock with sand grain size between 0 0625 mm 0 00245 in and 2 mm 0 08 in and containing less than 15 matrix 2 The related adjective is arenaceous The equivalent Greek derived term is psammite though this is more commonly used for metamorphosed sediments AreniteSince it refers to grain size rather than chemical composition the term is used for example in the classification of clastic carbonatic limestones as the granulometrically equivalent term sandstone is not appropriate for limestone Other arenites include sandstones arkoses greensands and greywackes Arenites mainly form by erosion of other rocks or turbiditic re deposition of sands Some arenites contain a varying amount of carbonatic components and thus belong to the rock category of carbonatic sandstones or silicatic limestones Arenites often appear as massive or bedded medium grained rocks with a middling to wide spaced preferred lamination and often develop a pronounced cleavage Pettijohn 3 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 Descriptive size terms Texture Common Greek LatinCoarse gravel ly psephite psephitic rudite rudaceous Medium sand y psammite psammitic arenite arenaceous Fine clay ey pelite pelitic lutite lutaceous References edit arena Charlton T Lewis and Charles Short A Latin Dictionary on Perseus Project Britannica definition of arenite Accessed on January 1 2008 Pettijohn Francis J 1975 Sedimentary Rocks Harper amp Row ISBN 0 06 045191 2 Retrieved from https en wikipedia org w index php title Arenite amp oldid 1209372825, wikipedia, wiki, book, books, library,
