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Clastic rocks - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-10) Igneous clastic rocks are broken due to flow, injection or explosive disruption of solid or semi-solid igneous rocks or lavas. Clastic sedimentary rocks are rocks composed predominantly of broken pieces or 'clasts' of older weathered and eroded rocks. Identifying a clastic rock as an impact breccia requires recognising shatter cones, tektites, spherulites, and the morphology of an impact crater, as well as potentially recognising particular chemical and trace element signatures, especialy osmiridium. en.wikipedia.org /wiki/Clastic   (629 words)

Mineral Resources Data System Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff > Ash-Flow Tuff Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt > Tholeiite A schistose metamorphic rock derived by metamorphism of an argillaceous or a fine-grained alluminous sediment. tin.er.usgs.gov /metadata/mrds.faq.html   (6867 words)

Rock Types Flint-like (glassy) sedimentary rock composed mostly of silica. Clastic sedimentary rock composed of rounded fragments in a binding matrix. Non-foliated metamorphic rock composed of interlocking quartz crystals. home.att.net /~cochrans/terms01.htm   (284 words)

The Rock Cycle   (Site not responding. Last check: 2007-10-10) Clastic rocks are classified based on the average size of the grains. Clastic rocks can have a wide variety of grain sizes, and even within a single rock, the range in grain sizes is called sorting. Clastic rocks (and sometimes crystalline rocks) may show bedding, which is a horizontal orientation to the minerals caused by successive accumulation of layers. geology.ou.edu /~msoreg/G1104/rock_cycle/sedimentary1.html   (249 words)

USGS Geology in the Parks Clastic sedimentary rocks are the group of rocks most people think of when they think of sedimentary rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. Shale is a rock made mostly of clay, siltstone is made up of silt-sized grains, sandstone is made of sand-sized clasts, and conglomerate is made of pebbles surrounded by a matrix of sand or mud. wrgis.wr.usgs.gov /docs/parks/rxmin/rock2.html   (315 words)

untitled Clastic sedimentary rocks are formed from the erosion and redeposition of particles of older rocks in water, ice, or air. Clastic fragments that have been churned or moved around by water for a long time are usually smooth, round, and similar in size. Shale - a fine-grained clastic sedimentary rock formed by the cementation of clay and /or silt. www.northern.edu /natsource/EARTH/Sdsedi1.htm   (1527 words)

Rocks and Minerals A sedimentary rock is a rock formed by the consolidation of sediment. Clastic sedimentary rocks are composed of fragments of older rocks that have been deposited and consolidated. The grain size of a sedimentary rock is significant because it reflects the strength of the process by which the sediment was transported. geology.csusb.edu /DIVGRANT/rxmin/rx3.htm   (798 words)

LAB 4 - SEDIMENTARY ROCKS Clastic sedimentary rocks are formed from aggregates of particles that originate as mineral and rock fragments weathered and eroded from pre-existing rocks. Clastic sedimentary rocks, therefore, can be classified on the basis of their particle size (for example conglomerate, sandstone or mudstone). This greenish gray rock is animpure sandstone, with a pod of grayish white fossil shell hash. www-rohan.sdsu.edu /~rhmiller/sedimentaryrocks/SedimentaryRocks.htm   (5814 words)

220Lec12 That is, it's recognized that a clastic sedimentary rock usually contains a relatively small number of non-clastic materials (often as cement) and a non-clastic rock may contain a few clasts. In some cases, it may not be possible to determine whether the components of a particular sedimentary rock are clastic or non-clastic. In some clastic sedimentary rocks, the cemented clasts are microscopic and may be difficult to distinguish from non-clastic sedimentary rocks. www.uky.edu /AS/Geology/henke/220/220Lec12.html   (810 words)

Clastic Sedimentary Rock Classification Sedimentary rocks are classified on the basis of the texture (grain size) of the rock, and composition. Sediments near high mountains frequently have large percentages of feldspar as batholiths and regional metamorphic rocks are uplifted and eroded (Wilson Cycle Stage F and Stage H). Rocks in these fields have between 10-25 % feldspar or lithics and are thus farther along in their evolution toward pure quartz than feldspathic or lithic rocks. csmres.jmu.edu /geollab/Fichter/SedRx/Clastic.html   (1862 words)

Mr The rocks texture is the size, shape and arrangement of the mineral crystals that the rock is composed of. Sedimentary rocks- rocks composed of fragments/ sediments of weathered rocks. In the Earth the pressure due to the weight of overlying rocks is a uniform stress, and is sometimes referred to as confining stress. teacher2.smithtown.k12.ny.us /sgessler/rocks.htm   (2205 words)

Terrigenous clastic rocks (from sedimentary rock) --  Britannica Concise Encyclopedia - The online encyclopedia you ... Terrigenous clastic sedimentary rocks are further subdivided on the basis of the mean grain diameter that characterizes most fragments, using the generally accepted size limits. Thus, a pebble conglomerate is a coarse clastic sedimentary rock whose discrete particles are rounded and range from 4 to 64 millimetres (0.2 to 2.5 inches) in diameter. Shale is any fine clastic sedimentary rock that exhibits fissility, which is the ability to break into thin slabs along narrowly spaced planes parallel to the layers of stratification. www.britannica.com /ebc/article-80248   (1163 words)

Igneous Rocks You may have noticed that there are many kinds of rocks, from the soft sandy rocks that form the cliffs at Scripps beach to the hard rocks that form the mountains to the East of San Diego. There are three general types of rocks, those that form from melt (igneous rocks), those that are deposited from air or water (sedimentary rocks), and those that have formed by "cooking" or otherwise altering another rock (metamorphic rocks). Sedimentary rocks: Rocks that are produced by the action of weathering and erosion that break down pre-existing rocks by physical and chemical processes. topex.ucsd.edu /es10/lectures/lecture10/lecture10.html   (1459 words)

Bryce Canyon National Park: GEODETECTIVE Program A single clastic sedimentary rock may be composed of one type of rock and mineral or many types of rocks and minerals. Rock made from silt is called siltstone, and rock made from sand is called sandstone. Conglomerate is rock made from varying sized particles that are cemented together by a matrix or mineral cement. www.nps.gov /brca/geodet/geodet_ohmy.html   (987 words)

Clastic Rocks Cathedral Rock in Arizona is made of a clastic rock called sandstone. Clastic sedimentary rocks are made up of little pieces of other rocks called sediment. Shale, a sedimentary rock made of mud and clay, may form in a swamp, the bottom of a lake, or some other muddy environment. www.windows.ucar.edu /tour/link=/earth/geology/sed_clastic.html   (259 words)

Clastic Dykes In this article, Roth claims that clastic dykes are evidence for a young-age earth and evidence for catastrophism associated with the flood. The reason most clastic dykes are sands injected into shales is due to the fact that the shales above the sand prevent water from escaping the sand as the sand compacts. This is a stage where essentially the overburden of rock is being supported by the water itself, not by the rock grains and this is unstable. home.entouch.net /dmd/clasdyke.htm   (1181 words)

Glossary S : A physical weathering process in which rock is eroded by the impact of sand grains carried by the wind, frequently leading to ventifact formation of pebbles and cobbles. : A clastic rock composed of grains from 0.0625 to 2 mm in diameter, usually quartz, feldspar, and rock fragments, bound together by a cement of quartz, carbonate, or other minerals, or by a matrix of clay minerals. : A metamorphic rock characterized by strong foliation or schistosity. www.whfreeman.com /presssiever/content/glossary/glossaryS.html   (1674 words)

Geoscience Australia: Education: Teachers: Glossary A coarse-grained clastic rock composed of angular broken rock fragments held together by a mineral cement or in a fine-grained matrix; it differs from conglomerate in that the fragments have sharp edges and unworn corners A fine-grained alkaline volcanic rock, primarily composed of alkali feldspar and feldspathoid minerals A sedimentary rock formed from consolidation of glacial drift (till), which is deposited directly by and underneath a glacier, and consists of a heterogeneous mixture of clay, silt, sand, gravel and boulders www.ga.gov.au /education/teachers/glossary.jsp   (975 words)

Sedimentary Layer Activity Sedimentary rocks are formed in two different ways and can be classified on the basis of texture and composition. Clastic rocks are formed from fragments of other rocks. Nonclastic rocks are also known as organic rocks, chemical rocks or evaporite rocks. www.usoe.k12.ut.us /CURR/SCIENCE/sciber00/7th/earth/sciber/sediment.htm   (523 words)

sed_pet.html   (Site not responding. Last check: 2007-10-10) Sedimentary rocks are classified and subclassified depending on the intended use. Clastic sedimentary rocks are formed from detritus which has been transported. One identifies the composition of clastic sedimentary rocks and point counts the components to determine their amounts, (i.e., performs a modal calculation) and then plots that on a triangular discrimination diagram). www.utc.edu /Faculty/Habte-Churnet/geol342/sedimentary/sed_pet.html   (1789 words)

Sedimentary Rocks Detrital, or clastic - detritus, or fragments, of other rocks (e.g., sandstone); the most important constituents are quartz, calcite, clay minerals (from the weathering of feldspars), rock fragments, and feldspars. Conglomerate - clastic rock in which the fragments are larger than 2 mm in size; fragments have rounded sides and corners. Breccia - clastic rock in which the fragments are larger than 2 mm in size; fragments have angular sides and corners. www.ux1.eiu.edu /~cfjps/1300/sed_rxs.html   (969 words)

Untitled Document sedimentary rocks are the result of a long process in which existing rocks are broken down into fragments, transported, and reconstituted as sedimentary rocks. occurs when rock materials are abraded or fragmented by collision with other particles or by frost wedging (when water in a crack in a rock freezes, expands, and breaks the rock apart). If a rock is well sorted, the grains in the rock are all approximately the same grain size. www.indiana.edu /~g103/G103/wk4/wk4.html   (942 words)

7b. Sedimentary Rocks: Layered Storytellers [Beyond Books - Earth Science: Part 2] Sandstone, another clastic sedimentary rock, is composed mainly of cemented grains of sand. Although renowned as a source of energy, coal is not usually thought of as a sedimentary rock. The color of sedimentary rock is another clue to the chemical composition of the sediments from which it formed. www.beyondbooks.com /ear82/7b.asp   (911 words)

[No title] We do this by separating sediments and sedimentary rocks into three groups based on the kinds or particles they contain: Clastic, Chemical, and Biogenic Clastic Sediment Formed from the loose rock and mineral debris produced by weathering and erosion This material is also referred to as detrital sediment. Clastic Sediment And Their Associated Sedimentary Rock The clastic sediment GRAVEL forms the clastic sedimentary rock CONGLOMERATE. Chemical Sediment Formed by the precipitation of minerals dissolved in lake or seawater The salt that coats the surface of dry lakes in Death Valley, is a chemical sediment. www.stchas.edu /faculty/jmatheney-rood/es_ch8_notes.doc   (828 words)

Introductory Geology - Clastic Rock Textures   (Site not responding. Last check: 2007-10-10) These photographs are of clastic rocks, which are composed of pieces (clasts) of other rocks or minerals; an example is a sandstone composed of sand-sized grains of the mineral quartz. Coarse-grained clastic rock with mostly rounded clasts (conglomerate), Hopi Buttes, Arizona Coarse-grained clastic rock with angular clasts (breccia), Lake Pleasant, Arizona geology.asu.edu /~reynolds/glg103/rock_textures_clastic.htm   (129 words)

Sedimentary Rocks The final rock formed maintains a history of these processes- important for understanding how the surface of the Earth has evolved. Net result is that the sediments become a rock, and pore space is reduced. Clastic rocks - information about the parent material, extent of weathering, mode of transportation, environment of deposition. www.clas.ufl.edu /users/emartin/gly2010f98/lectures/sedrocks.html   (979 words)

Outdoor Recreation: Rock Hounding Particles in shale are commonly clay minerals mixed with tiny grains of quartz eroded from pre-existing rocks. A very fine-grained sedimentary rock made of quartz. Usually made of millions of globular siliceous skeletons of tiny marine plankton called radiolarians. www.desertusa.com /geofacts/rocks_set.html   (398 words)

Sedimentary Rocks Sedimentary rocks made of silt- and clay-sized particles are collectively called mudrocks, and are the most abundant sedimentary rocks. We know that because the actual wood fragments are easily visible in low-grade varieties of coal, fossilized wood is often found in adjacent rocks, the overall environment is typical of coastal swamp or delta settings, and ancient soils are sometimes found beneath the coal beds. Since oil weighs a lot less than rock, the oil in a well weighs far less than the same volume of rock next to the well. www.uwgb.edu /dutchs/EarthSC202Notes/SEDROCKS.HTM   (1216 words)

LAB Was this rock deposited in quiet, intermediate or turbulent conditions? This rock preserves a dramatic change in the depositional energy regime. 17)  This rock came from the same rock sequence as rocks 1 and 8. faculty.etsu.edu /schubert/LAB2keyc.htm   (920 words)

SEDIMENTARY_ROCKS are fossil carrying rocks, with most fossils found not on land but in shallow ocean rocks Features in the rocks that form at the same time that the rocks form Sedimentary rocks can help identify what's happened in the past--marine environment is the one where you have best preservation. blue.utb.edu /paullgj/physci1417/Lectures/SEDI_ROCKS.htm   (929 words)

[No title]   (Site not responding. Last check: 2007-10-10) What is the primary difference between a chemical sedimentary rock and a clastic sedimentary rock? While conducting field research in an area characterized by sedimentary rock, you find a rock consisting of clay, sand and pebble-sized clasts. Upon further study, you determine that the sand-sized clasts are mostly well-rounded quartz grains, and the pebble-sized clasts are angular chert fragments. mtsu32.mtsu.edu:11407 /1030revquestseds.htm   (352 words)

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