what is craton in geology
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Craton A craton (/ˈkreɪtɒn/ , /ˈkraetɒn/ , ˈkrætɒn /or/ ; ˈkreɪtən From: greek κράτος kratos) strength is an old and stable part of the continental. lithospherehe word craton was first proposed by the Austrian geologist Leopold Kober in 1921 as Kratogen, referring to stable continental platforms, and orogen as a term for mountain or orogenic belts.
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Sedimentary rocks Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock.
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Pictures of Sedimentary Rocks Shale is a clastic sedimentary rock that is made up of clay-size (less then 1/256 millimeter in diameter) weathering debris. It typically breaks into thin flat pieces. The specimen shown above is about two inches (five centimeters) across.
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Glossary of geology For other uses, see Shale (disambiguation) . Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite.The ratio of clay to other minerals is variable.or other uses, see Shale (disambiguation) . Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite.
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Supercontinent In geology, a supercontinent is the assembly of most or all of the Earth 's continental blocks or cratons to form a single large landmass. However, the definition of a supercontinent can be ambiguous.assive margins are therefore born during the break-up of supercontinents and die during supercontinent assembly. Pangaea's supercontinent cycle is a good example for the efficiency of using the presence, or lack of, these entities to record the development, tenure, and break-up of supercontinents.
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Geology phenocryst. A phenocryst is a conspicuous, large crystal embedded in a finer-grained matrix of smaller crystals in a porphyritic igneous rock. (left-click to enlarge image-a plagioclase feldspar phenocryst, Lambert Dome, Yosemite, courtesy Daniel Mayer). Porphyrys are formed by a two-stage cooling of rising magma. First, deep crustal magma cools slowly, allowing formation of large phenocrysts (diameter 2 mm or more).
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Geology Geology can also refer generally to the study of the solid features of any celestial body (such as the geology of the Moon or Mars). Geology gives insight into the history of the Earth by providing the primary evidence for plate tectonics, the evolutionary history of life, and past climates.here are three major types of rock: igneous, sedimentary, and metamorphic. The rock cycle is an important concept in geology which illustrates the relationships between these three types of rock, and magma.
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- Sedimentary rocks are made of rock or mineral fragments deposited in layers by water, wind or ice at the earth's surface. Individual grains, or clasts, are bound together by compaction or cementation, or both. Clastic rocks are made from weathered rock debris.
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Craton A craton (/ˈkreɪtɒn/ , /ˈkraetɒn/ , ˈkrætɒn /or/ ; ˈkreɪtən From: greek κράτος kratos) strength is an old and stable part of the continental. Lithosphere having often survived cycles of merging and rifting of, continents cratons are generally found in the interiors of tectonic. plateshe word craton was first proposed by the Austrian geologist Leopold Kober in 1921 as Kratogen, referring to stable continental platforms, and orogen as a term for mountain or orogenic belts.
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SEDIMENTARY ROCKS Clastic sedimentary rocks are sometimes considered true sedimentary rocks as they are composed directly of the sediments or fragments from other rocks. These fragments are called clasts, hence the term clastic.
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Continental crust From Wikipedia, the free encyclopedia. The thickness of Earth's crust (km). The continental crust is the layer of igneous, sedimentary, and metamorphic rocks that forms the continents and the areas of shallow seabed close to their shores, known as continental shelves.his line is called the Conrad discontinuity .). Consisting mostly of granitic rock, continental crust has a density of about 2.7 g/cm 3 and is less dense than the material of Earth's mantle, which consists of ultramafic rock and whose density is about 3.3 g/cm 3.
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Geology Geology (from the Ancient Greek γῆ, gē, i.e. earth and -λoγία, -logia, i.e. study of, discourse) is an earth science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which they change.
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The exposed portion of the North American craton containing metamorphic and igneous rocks is called the? Platforms and shields together make up cratons. The shield is the part of the craton that is exposed at Earth's surface and the platform is the part of the craton that is cove … red by sedimentary strata.
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What is shale? According to geology dot com: Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call mud. This composition places shale in a category of sedimentary rocks known as mudstones.
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Sedimentary Rocks: Definition, Types & Examples Clastic rocks are composed of fragments of rock and mineral debris produced by weathering of other rocks on the earth's surface. During weathering, large masses are physically broken up into smaller pieces, and those grains, or clasts, are given names based on their sizes.Many of the terms are likely familiar to you.edimentary rocks are made of rock or mineral fragments deposited in layers by water, wind or ice at the earth's surface. Individual grains, or clasts, are bound together by compaction or cementation, or both.
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Sedimentary Rocks: Definition, Types & Examples Clastic rocks are composed of fragments of rock and mineral debris produced by weathering of other rocks on the earth's surface. During weathering, large masses are physically broken up into smaller pieces, and those grains, or clasts, are given names based on their sizes. Many of the terms are likely familiar to you.
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Craton The concept of cratons first appeared at the turn of the 20th century in the works of A. P. Karpinskii, E. Suess and G. E. Haug. In 1932, A. D. Arkhangel’skii used the Russian term platforma for the first time in its modern sense to denote a central continental craton.
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What is the definition of clastic sedimentary rocks? Clastic sedimentary rocks are those that are composed of cemented particles of other rocks. Examples are conglomerate, breccia, sandstone, and shale.
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Planetary geology Although the geo-prefix typically indicates topics of or relating to the Earth, planetary geology is named as such for historical and convenience reasons; applying geological science to other planetary bodies.urface of Mars as photographed by the Viking 2 lander December 9, 1977. Planetary geology, alternatively known as astrogeology or exogeology, is a planetary science discipline concerned with the geology of the celestial bodies such as the planets and their moons, asteroids, comets, and meteorites.
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- Cratons are the foundations of the continents, North America, for example, is composed of the Superior, Hearne, Rae, and Slave cratons, all of which were welded together along deformation belts to form a larger cratonic unit during the Proterozoic Eon.
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Sedimentary rock Sediments and sedimentary rocks are confined to the Earth’s crust, which is the thin, light outer solid skin of the Earth ranging in thickness from 40–100 kilometres (25 to 62 miles) in the continental blocks to 4–10 kilometres in the ocean basins. Igneous and metamorphic rocks constitute the bulk of the crust.
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Conglomerate Conglomerate is a clastic sedimentary rock that contains large (greater than two millimeters in diameter) rounded clasts.The space between the clasts is generally filled with smaller particles and/or a chemical cement that binds the rock together. Conglomerate can have a variety of compositions.As a clastic sedimentary rock it can contain clasts of any rock material or weathering product that is washed downstream or down current.The rounded clasts of conglomerate can be mineral particles such as quartz or they can be sedimentary, metamorphic or igneous rock fragments.The matrix that binds the large clasts together can be a mixture of sand, mud and chemical cement.he space between the clasts is generally filled with smaller particles and/or a chemical cement that binds the rock together. Conglomerate can have a variety of compositions. As a clastic sedimentary rock it can contain clasts of any rock material or weathering product that is washed downstream or down current.
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West Bridgewater, Massachusetts West Bridgewater, Massachusetts. West Bridgewater is a town in Plymouth County, Massachusetts, United States. The population was 6,916 at the 2010 census.
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- Archean cratons are relatively flat, stable regions of the crust that have remained undeformed since the Precambrian, forming the ancient cores of the continents.23. One person's conception. Sometimes a shortened name is used: Archon=Archean+craton; Proton=Proterozoic+craton.
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- A sedimentary rock is a layered rock that is formed from the compaction, cementation, and the recrystallization of sediments. Compaction is the squeezing together of layers of sediment due to the great weight of overlying layers of rock.
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Sedimentary rock Clastic sedimentary rocks are composed of other rock fragments that were cemented by silicate minerals. Clastic rocks are composed largely of quartz, feldspar, rock (lithic) fragments, clay minerals, and mica; any type of mineral may be present, but they in general represent the minerals that exist locally.