Petrogenetic Significance of the Covariance Relationship between Compatible and Incompatible Elements

On the basis of the previous quantitative modeling of trace element behavior in magmatic pro-cesses such as fractional crystallization ,batch melting and magma mixing,the author has shown the covariance relationship between compatible and incompatible elements. The discussion of the covariance relationship among trace elements indicates that the covariance relationship can be used to study the petrogenesis of igneous rocks and that the relationship be-tween compatible and incompatible elements are most important in distinguishing equilibrium process(melting and crystallization )from other magmatic processes, i.e.,the former shows a hyperbola trend on C1^i vs .C1^i diagrams,and however, the fractional process gives an exponent curve and magma mixing presents a straight line .On the other hand ,log C1^i vs .C1^i diagrams are also discussed here. Alkaline rocks from Zijinshan, Lin County, Shanxi Province are taken for example in our study ,indicating that the rocks were derived from batch melting of the upper mantle.

On the basis of the previous quantitative modelling of trace element behavior in magmatic pro- cesses such as fractional crystallization,batch melting and magma mixing,the author has shown the covariance relationship between compatible and incompatible elements. The discussion of the covariance relationship among trace elements indicates that the covariance relationship can be used to study the petrogenesis of igneous rocks and that the relationship be- tween compatible and incompatible elements are most important in distinguishing equilibrium process (melting and crystallization)from other magmatic processes,i.e.,the former shows a hyperbola trend on C_I^i vs.C_I^j diagrams,and however,the fractional process gives an exponent curve and magma mixing presents a straight line.On the other hand,log C_O^i vs.log C_I^j diagrams are also discussed here. Alkaline rocks from Zijinshan,Lin County,Shanxi Province are taken for example in our study,indicating that the rocks were derived from batch melting of the upper mantle.