Epigenetic Deposit

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Epigenetic Deposit


a mineral deposit that formed later than the enclosing rocks. The mineral composition and chemical composition of epigenetic deposits differ markedly from the composition of the enclosing rocks.

Epigenetic deposits usually occur in the form of veins, lenses, stocks, and pipes that cut through the rocks; zones of mineralization accompanying epigenetic deposits form in the enclosing rocks through their action. Epigenetic deposits include magmatic deposits of titanomagnetites, chromites, platinoids, diamonds, and apatite, as well as certain bodies of sulfide copper-nickel ores. They also include pegmatite deposits of ceramic raw materials, mica, precious stones, lithium, and beryllium and skarn deposits of iron, copper, lead, zinc, and other metallic ores. The broadest group of epigenetic deposits includes hydrothermal vein and metasomatic deposits of ores of the nonferrous, rare, noble, and radioactive metals and deposits of quartz, barite, fluorite, and asbestos. Infiltration deposits of ores of iron, copper, and uranium are also classified as epigenetic deposits.

Epigenetic deposits are contrasted to syngenetic deposits, which formed at the same time as the enclosing rocks.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Lower G zone, also exploited at the Mogul mine, was a steeply dipping epigenetic deposit in which sphalerite and galena were the dominant sulfides with increasing pyrite and marcasite toward the upper parts.
220 [degrees] C) which formed the epigenetic deposits as they rose.