ANALYSIS OF THEORETICAL CONCEPTS AND EXPERIMENTAL DATA ON THE DISTRIBUTION OF MINERAL GRAINS BY THEIR SIZE WITHIN MAGMATIC ROCKS

摘要

The critical review is given for existing concepts of the mechanism distributing mineral grains within a crystalline rock by their size. Two possible explanations are suggested for the inverse linear dependence between logarithm of the number of grains and their size observed in a series of cases. This function is detected either in the whole range of sizes or within the more developed right branch of the distribution curve. One explanation of this peculiarity is based on the known Zeldovich equation describing the process of the crystal nucleation development after an 《instantaneous》 creation of the supersaturation and further maintaining of this state later on. Another explanation is based on the well known phenomenon of the crystals 《breeding》 and assumes that the nucleation process ought to be considered as a chain reaction. The equation to calculate the information entropy for the function of distribution of the mineral grains by their size was improved also.