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replacement

replacement Widely used geologic term denoting a process that involves some kind of transformation. In a petrological sense it refers to the partial or complete alteration of an original mineral to an aggregate of secondary minerals, by the diffusion of ions between the solid phases and an introduced, fluid (usually water-rich) phase. Such diffusion takes place easily when the temperature of the rock system is below the stability limit of an individual mineral and a fluid is present to act as a catalyst to initiate the diffusion reactions. The secondary minerals may be all of one type, or a combination of mineral types. For example, high-temperature, magnesium-rich olivine can be replaced by an aggregate of secondary serpentine and chlorite, while plagioclase can be replaced by a fine aggregate of white mica (sericite). See also FOSSILIZATION.

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"replacement." A Dictionary of Earth Sciences. . Encyclopedia.com. 15 Aug. 2017 <http://www.encyclopedia.com>.

"replacement." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 15, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/replacement

"replacement." A Dictionary of Earth Sciences. . Retrieved August 15, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/replacement

replacement

re·place·ment / riˈplāsmənt/ • n. the action or process of replacing someone or something: the replacement of religion by poetry| a hip replacement. ∎  a person or thing that takes the place of another.

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"replacement." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 15 Aug. 2017 <http://www.encyclopedia.com>.

"replacement." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 15, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/replacement

"replacement." The Oxford Pocket Dictionary of Current English. . Retrieved August 15, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/replacement

replacement

replacement The substitution of one amino acid for another as a consequence of a nonsynonymous mutation at the DNA level.

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"replacement." A Dictionary of Ecology. . Encyclopedia.com. 15 Aug. 2017 <http://www.encyclopedia.com>.

"replacement." A Dictionary of Ecology. . Encyclopedia.com. (August 15, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/replacement-0

"replacement." A Dictionary of Ecology. . Retrieved August 15, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/replacement-0