Assimilation, Mixing

Ferrara G, Preite-Martinez M, Taylor HP, Tonarini S, Turi B (1986) Evidence for crustal assimilation, mixing of magmas, and a 87Sr-rich upper mantle. Contrib Mineral Petrol 92 269-280... 

Although stream standards are the most reaUstic in light of the use of the assimilative capacity of the receiving water, they are difficult to administer and control in an expanding industrial and urban area. The equitable allocation of poUutional loads for many industrial and municipal complexes also poses pohtical and economic difficulties. A stream standard based on minimum dissolved oxygen at low stream flow intuitively implies a minimum degree of treatment. One variation of stream standards is the specification of a maximum concentration of a poUutant (ie, the BOD) in the stream after mixing at a specified low flow condition. 

A two phase process, in which the feedstock (e.g., petroleum) was mixed with water and an organic solvent to improve denitrogenation of aromatic nitrogen compounds [102], led to an improvement of the process. Additionally, a surfactant was used to increase the interfacial area. Carbazole and quinoline and their alkyl derivatives were used as primary compounds for demonstration. The biocatalyst is used in resting stage and is continuously fed to the system to keep the reaction rate at an acceptable level. It was observed that quinoline was hardly removed under the conditions at which carbazole was decomposed and assimilated. 

The mg is a useful parameter in petrologic problems it varies rapidly with the fractionation of mafic minerals from basalts and is left almost unchanged by assimilation of crustal material, which contains very little Fe and Mg. The two coordinates may be considered as ratios, CaO with a constant denominator, mg with (Fe + Mg) as the denominator. Mixing and fractionation relationships are therefore not straight lines in such a diagram. The mixing curvature is usually strong as it is a function of the atomic (Fe + Mg) contents in crust and basalt, which are usually extremely different. <>... 

The evolntionary history of the magma including processes of isotope exchange, assimilation of conntry rocks, magma mixing, etc... 

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