What is mineral assemblage?
Any set of minerals in a rock, whether in equilibrium or not. It can be made more specific by prefixing with prograde, syn-metamorphic, retrograde etc.
Why does mineral zoning occur?
Zoning results from the mineral’s inability to maintain chemical equilibrium with a magma during rapid cooling; the zonation represents a frozen picture of the continuous reaction series for that mineral.
What is Syngenetic and epigenetic deposits?
Sedimentary Ore Deposits are the example of syngenetic Ore Deposits. 4. Epigenetic Ore Deposits The Ore deposits that are formed later than the enclosing rock, are called “Epigenetic ore deposits”. Hydrothermal ore deposits are the example of epigenetic ore deposits.
What are epigenetic deposits?
a mineral deposit that formed later than the enclosing rocks. 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.
What is metamorphic mineral assemblage?
metamorphic rocks involve a complete change in mineral assemblage or simply a shift in the compositions of the preexisting mineral phases. The resultant mineral assemblage will reflect the chemical composition of the original rock and the new pressure-temperature conditions to which the rock was subjected.
What do you mean by assemblage?
Definition of assemblage 1 : a collection of persons or things : gathering. 2 : the act of assembling : the state of being assembled. 3a : an artistic composition made from scraps, junk, and odds and ends (as of paper, cloth, wood, stone, or metal) b : the art of making assemblages.
What is a mineralogical phase rule?
Originally proposed by Goldschmidt (1911), the Mineralogic Phase Rule is a special boundary condition of the Gibbs Phase Rule, F=C+ 2–P (see Vol. IVA, Phase Equilibria), which states that temperature and pressure are externally controlled and probably variable across the stability range of a particular assemblage.