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Clastic rocks refers to rocks formed from fragments of pre-existing rock. The most common usage is for clastic or detrital sedimentary rocks. However, the usage is not restricted to sediments. Sedimentary, volcanic, plutonic, metamorphic rock types of North America. ...
Two types of sedimentary rock: limey shale overlaid by limestone. ...
Clastic metamorphic and igneous rocks
Clastic metamorphic rocks include breccias formed in faults, as well as some protomylonite and pseudotachylyte. Occasionally, metamorphic rocks can be brecciated via hydrothermal fluids, forming a hydrofracture breccia. Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means change in form, derived from the Greek words meta, change, and morphe, form. The protolith is subjected to extreme heat (>150 degrees Celsius) and pressure causing profound...
Breccia, derived from the Latin word for broken, is a sedimentary rock composed of angular fragments in a matrix that may be of a similar or a different material. ...
Mylonite is a fine-grained, compact rock without cleavage or crystals. ...
Hydrothermal circulation in the oceans is the passage of the water through mid-ocean Ridge (MOR) systems. ...
Clastic igneous rocks include pyroclastic volcanic rocks such as tuff, agglomerate and intrusive breccias, as well as some marginal eutaxitic and taxitic intrusive morphologies. Igneous clastic rocks are broken due to flow, injection or explosive disruption of solid or semi-solid igneous rocks or lavas. Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ...
Pyroclastic rocks are formed from lavas which are ejected into the air, as occur in pyroclastic flows or Plinian eruptions. ...
Welded tuff at Golden Gate in Yellowstone National Park Tuff (from the Italian tufo and pronounced tuf) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. ...
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Breccia, derived from the Latin word for broken, is a sedimentary rock composed of angular fragments in a matrix that may be of a similar or a different material. ...
Look up lava, Aa, and pahoehoe in Wiktionary, the free dictionary. ...
Clastic sediments Clastic sedimentary rocks are rocks composed predominantly of broken pieces or 'clasts' of older weathered and eroded rocks. Clastic sediments or sedimentary rocks are classified based on grain size, clast and cementing material (matrix) composition, and texture. The classification factors are often useful in determining a sample's environment of deposition. Two types of sedimentary rock: limey shale overlaid by limestone. ...
Weathering is the process of disintegration of rocks, soils and their minerals through natural, chemical, and biological processes. ...
Severe soil erosion in a wheat field near Washington State University, USA. Erosion is the displacement of solids (soil, mud, rock, and other particles) by the agents of wind, water, ice, movement in response to gravity, or living organisms (in the case of bioerosion). ...
This article deals with grain size in the context of geology, see crystallite for grain size in materials science. ...
The matrix or groundmass of an igneous rock consists of fine grained often microscopic crystals in which larger crystals (phenocrysts) are embedded. ...
Grain size determines the basic name of a clastic sedimentary rock. Grain size varies from clay in shales; through silt in siltstones; sand in sandstones; and gravel, cobble, to boulder sized fragments in conglomerates and breccias. The Krumbein phi (φ) scale numerically orders these terms in a logarithmic size scale. Quaternary clay in Estonia. ...
Shale Shale is a fine-grained sedimentary rock whose original constituents were clays or muds. ...
Silt refers to soil or rock particles of a certain very small size range (see grain size). ...
Categories: Stub | Sedimentary rocks ...
For other uses, see Sand (disambiguation). ...
Sandstone near Stadtroda, Germany Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock grains. ...
Gravel being unloaded from a barge Gravel is rock that is of a certain grain size range. ...
Cobble is a geologic term for a rock or rock fragment with a grain size with dimensions between 64–256 mm (2. ...
This article is about the large rocks known as boulders. ...
A conglomerate with iron oxide cementing material A conglomerate is a rock consisting of other stones that have been cemented together. ...
Breccia, derived from the Latin word for broken, is a sedimentary rock composed of angular fragments in a matrix that may be of a similar or a different material. ...
This article deals with grain size in the context of geology, see crystallite for grain size in materials science. ...
Composition includes the chemical and mineralogic make-up of the single or varied fragments and the cementing material (matrix) holding the clasts together as a rock. A chemical substance is any material substance used in or obtained by a process in chemistry: A chemical compound is a substance consisting of two or more chemical elements that are chemically combined in fixed proportions. ...
This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ...
The matrix or groundmass of an igneous rock consists of fine grained often microscopic crystals in which larger crystals (phenocrysts) are embedded. ...
An example clastic environment would be a river system, in which the full range of grains being transported by the moving water consist of pieces eroded from solid rock upstream. Severe soil erosion in a wheat field near Washington State University, USA. Erosion is the displacement of solids (soil, mud, rock, and other particles) by the agents of wind, water, ice, movement in response to gravity, or living organisms (in the case of bioerosion). ...
Sedimentary breccias Sedimentary breccias are a type of clastic sedimentary rock which are composed of angular to subangular, randomly oriented clasts of other sedimentary rocks. They are formed by either submarine debris flows, avalanches, mud flow or mass flow in an aqueous medium. Technically, turbidites are a form of debris flow deposit and are a fine-grained peripheral deposit to a sedimentary breccia flow. Breccia, derived from the Latin word for broken, is a sedimentary rock composed of angular fragments in a matrix that may be of a similar or a different material. ...
This article refers to the natural event known as an avalanche. ...
USGS image Turbidite geological formations have their origins in turbidity current deposits, deposits from a form of underwater avalanche that are responsible for distributing vast amounts of clastic sediment into the deep ocean. ...
The other derivation of sedimentary breccia is as angular, poorly sorted, very immature fragments of rocks in a finer grained groundmass which are produced by mass wasting. These are, in essence, lithified colluvium. Thick sequences of sedimentary (colluvial) breccias are generally formed next to fault scarps in grabens. Colluvium or hillwash is the name for loose bodies of sediment that has been deposited or built up at the bottom of a low grade slope or against a barrier on that slope, as a result of rainwater or downhill creep by gravity. ...
USGS image A graben is a depressed block of land bordered by parallel faults. ...
In the field, it may at times be difficult to distinguish between a debris flow sedimentary breccia and a colluvial breccia, especially if one is working entirely from drilling information. Sedimentary breccias are an integral host rock for many SEDEX ore deposits. An electric drill A drill is a tool with a rotary drill bit used to bore holes through material. ...
Sedimentary exhalative deposits (abbreviated as SEDEX from SEDimentary EXhalative) are ore deposits which are interpreted to have been formed by release of ore-bearing hydrothermal fluids into a water reservoir (usually the ocean), resulting in the precipitation of stratiform ore. ...
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Igneous clastic rocks Igneous clastic rocks can be divided into two classes Image File history File links Basalt_breccia. ...
Image File history File links Basalt_breccia. ...
Basalt Basalt is a common gray to black volcanic rock. ...
Epidote is a calcium aluminium iron sorosilicate mineral, Ca2(Al, Fe)3(SiO4)3(OH), crystallizing in the monoclinic system. ...
- Broken, fragmental rocks produced by intrusive processes, usually associated with plutons or porphyry stocks
- Broken, fragmental rocks associated with volcanic eruptions, both of lava and pyroclastic type
Pluton redirects here. ...
Pluton redirects here. ...
Look up lava, Aa, and pahoehoe in Wiktionary, the free dictionary. ...
Pyroclastic rocks are formed from lavas which are ejected into the air, as occur in pyroclastic flows or Plinian eruptions. ...
Hydrothermal clastic rocks Hydrothermal clastic rocks are generally restricted to those formed by hydrofracture, the process by which hydrothermal circulation cracks and brecciates the wall rocks and fills it in with veins. This is particularly prominent in epithermal ore deposits and is associated with alteration zones around many intrusive rocks, especially granites. Many skarn and greisen deposits are associated with hydrothermal breccias. Hydrothermal circulation in the oceans is the passage of the water through mid-ocean Ridge (MOR) systems. ...
Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ...
Metasomatism is a geologic process where metamorphism causes an alteration in a mineral or rock mass that involves a chemical change of the substance with the addition of material, as when chrysolite (olivine) is converted to serpentine basically by the addition of water. ...
Quarrying granite for the Mormon Temple, Utah Territory. ...
Skarn is a fine grained metamorphic rock that is usually variably colored green or red, occasionally grey, black, brown or white. ...
Greisen is a highly altered granitic rock or pegmatite. ...
Impact breccias A fairly rare form of clastic rock is formed during meteorite impact. This is composed primarily of ejecta; clasts of country rock, melted rock fragments, tektites (glass ejected from the impact crater]] and exotic fragments, including fragments derived from the impactor itself. A meteorite is a small extraterrestrial body that impacts the Earths surface. ...
A tektite Tektites (from Greek tektos, molten) are natural glass objects, up to a few centimeters in size, which — according to most scientists — have been formed by the impact of large meteorites on Earths surface, although a few researchers favor an origin from the Moon as volcanic ejecta. ...
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. Shatter Cone from the Steinheim Basin, Germany A shatter cone is that rare fragment of stone whose origin is from the very center of an meteorite impact crater. ...
Tektite Tektites (from Greek tektos, molten) are glass objects, up to a few centimeters in size, which may be formed by the impact of large meteorites on Earths surface. ...
Spherulites, in petrology, are small, rounded bodies that commonly occur in vitreous igneous rocks. ...
Look up crater on Wiktionary, the free dictionary. ...
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