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diagenesis
Book article from: The Oxford Companion to the Earth
diagenesis The term ‘diagenesis’ is attributed to von Gumbel who coined it at the...burial, excluding the effects of tectonism and metamorphism. Diagenesis usually, but not always, results in the production of an...
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diagenesis in deep-sea sediments
Book article from: The Oxford Companion to the Earth
diagenesis in deep-sea sediments The organic...material and the rate of burial are low, diagenesis does not generally continue beyond this...water can fall to such a low level that diagenesis must proceed using secondary oxidants...
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sedimentary geochemistry
Book article from: The Oxford Companion to the Earth
...processes, collectively termed sedimentary diagenesis , occur through interactions between...often subsequently reprecipitate during diagenesis to form new minerals as cements in sediment...oxides such as haematite; or calcite. Diagenesis may also lead to dissolution of detrital...
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sand and sandstone
Book article from: The Oxford Companion to the Earth
...the grain during transport and, to a lesser extent, during diagenesis. Constant collision of grains during transport smooths the...deposition, although this can be modified or altered during diagenesis. Weathering, transportation by wind, and ice impart characteristic...
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Metamorphism
Encyclopedia entry from: The Gale Encyclopedia of Science
...metamorphism. These occur between the low-temperature process of diagenesis (temperature above 392 ° F [200 ° C] and...Palisades sill, an igneous intrusion, produced contact KEY TERMS Diagenesis — Compaction, cementation, and other processes...
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taphonomy
Book article from: The Oxford Companion to the Earth
...main areas of study; necrolysis, biostratinomy, and fossil diagenesis. Necrolysis deals with the processes that act on an organism...organisms, termed fossil Lagerstätten. Fossil diagenesis can lead to the preservation of fossils, as in the permineralization...
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textures of rocks
Book article from: The Oxford Companion to the Earth
...spaces of a rock commonly cement together the clastic grains. These processes in which sediments are altered and compacted are known as diagenesis . Metamorphism could be thought of as an extreme form of diagenesis, but diagenetic proc
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clays
Book article from: The Oxford Companion to the Earth
...lakes, for example. When buried by later sediments, clays can undergo changes in their mineralogy, a process known as diagenesis. Further increases in temperature and pressure will convert a clay into a shale and then a slate. Because of this, clay...
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brines
Book article from: The Oxford Companion to the Earth
...production. Connate or formation waters are formed from fluids trapped in spaces between particles in sediments. During diagenesis and burial some fluids are squeezed out and will escape, but some will remain trapped in isolated pockets and form oilfield...
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chalk
Book article from: The Oxford Companion to the Earth
...is composed dominantly of calcite and was deposited originally as this mineral. It thus underwent much less change during diagenesis than limestones originally composed of aragonite and high-magnesium calcite. Chalk has subsequently retained much of its...
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