Discovery of Natural Separation of Isotopes in Layered Intrusions Provided by the Gradients of a Temperature, of a Pressure and of a Deformation, using Lukkulaisvaara Intrusion (North Karelia) as an Example

Abstract

The spatial local anomalies of the concentration ratios for isotopes ¹⁴³Nd/¹⁴⁴Nd (or eNd) and ⁸⁷Sr/⁸⁶Sr in Lukkulaisvaara intrusion (North Karelia) were discovered. The physical mechanisms and the  descriptions of the effect of an arising of the anomalies were developed and presented. The base of the proposed mechanisms is the phenomena of the migration (diffusion) of components, due to the (T, P (or D)) gradients. The description of the processes of an arising of the gradients of a temperature (T), of a pressure (P) and of a deformation (D) in the layered inhomogeneous intrusion  during its formation and evolution, were obtained. It was shown that the gradients can  induce the spatial redistribution of the chemical elements and their isotopes in the intrusion. The redistribution, in turn, can lead to the observed spatial concentration anomalies for these components , i.e to the separation of isotopes, in part. There were first obtained the expressions for the diffusion additions to the isotope´s parameter \(\xi\) (\(\xi\)Nd, in part). Greatest study objective was the discovery of separation of isotopes in natural conditions.