Distribution Coefficient

Compounds mixing with groundwater to pollute waterways and its toxicity to animals and aquatic life.

Effect of variable oxygen fugacity on the multivalent elements with increasing reducing conditions in enstatite chondrite material.

REE enrichment in the melt of basaltic magma during crystal fractionation .

1. DISTRIBUTION OR PARTITION COEFFICIENT ( D ) ABHIRUP SAHA PG II

2. PROBLEMS Compounds mixing with groundwater to pollute waterways and its toxicity to animals and aquatic life. Effect of variable oxygen fugacity on the multivalent elements with increasing reducing conditions in enstatite chondrite material. REE enrichment in the melt of basaltic magma during crystal fractionation .

3. OBSERVATIONS During the partial melting of peridotite we can readily see— That Rb ( D Rb = 0.016), Sr ( D Sr = 0.025), Ba ( D Ba = 0.008), and the REE are incompatible elements for typical mantle minerals, and are concentrated in the melt , W hereas Ni ( D Ni = 10.4) and Cr ( D Cr = 6.39) are compatibles, and remain principally in the solid peridotite residua.

4. The preferential movement of elements and their entry in the solid and liquid phases during magmatic crystallization . E lement P artitioning DISTRIBUTION COEFFICIENT (D ) Ratio of the concentration of element in solid to its concentration in the melt.

5. PARTITION COEFFICIENT D= C S /C L C S = Concentration of the element in the solid. C L = Concentration of the element in the liquid. FOR COMPATIBLE ELEMENTS D>1 FOR INCOMPATIBLE ELEMENTS D<1

6. TYPES OF INCOMPATIBLE ELEMENTS B ased on the ratio of valence to ionic radius. The smaller, more highly charged H igh F ield S trength (HFS) elements include the REE, Th , U, Ce, Pb4+, Zr , Hf , Ti, Nb, and Ta. The low field strength L arge ion Lithophile Elements ( LILE) elements (K, Rb, Cs, Ba, Pb2+, Sr , Eu2+) are generally considered to be more mobile .

7. PARTIAL MELTING CRYSTAL FRACTIONATION BATCH MELTING ( EQUILIBRIUM PARTIAL MELTING ) LIQUID IN EQUILIBRIUM WITH RESIDUE . ESCAPE AS A SINGLE BATCH OF MAGMA . 𝑪 𝑳 /𝑪 𝑶 = 𝟏/𝑫 ∗(𝟏−𝑭)+𝑭 EQUILIBRIUM CRYSTALLISATION EQULIBRIUM BETWEEN ALL SOLIDS AND MELTS DURING CRYSTALLISATION . C L /C O = 1/ [ D + F * (1 - D )] RAYLEIGH MELTING LIQUID IN EQUILIBRIUM WITH RESIDUE . REMOVED IMMEDIATELY FROM THE SYSTEM . C L /C O = 1/D * ( 1- F ) ^ (1/D – 1) RAYLEIGH FRACTIONATION ( FRACTIONAL CRYSTALLISATION ) CRYSTAL NOT IN EQULIBRIUM WITH MELT . CRYSTALS REMOVED FROM THE SITE OF FORMATION . C L /C O = F ^ ( D - 1 ) Co = concentration of the element in the starting material (in the case of mantle melting, the concentration in the original mantle). CL = concentration of the element in the liquid (i.e. melt ). D = bulk partition coefficient for the residual solid (in case of crystal fractionation D for fractionating assemblage). F = weight fraction of melt produced.

8. CONCLUSION D VALUES CAN BE USED TO DETERMINE THE PREFERENCE OF AN ELEMENT TO ENTER A CRYSTAL LATTICE OR MELT DURING MAGMATIC CRYSTALLIZATION. D VALUES CAN BE CORELATED WITH VARIOUS IGNEOUS PROCESSES SUCH AS PARTIAL MELTING AND FRACTIONAL CRYSTALLIZATION .

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