Comparative characteristics of the paragenetic features of the composition of garnets from some kimberlite bodies of the Mirny field

Abstract

Introduction: The compositions of garnets were studied for three kimberlite bodies of the Mirny field (Mir, Internatsionalnaya and Dachnaya pipes). This field is located within the Malo-Botuobinsky diamondiferous region of Western Yakutia. Materials and Methods: The paragenetic affiliation of garnets was determined based on their chemical composition using the «MineralogicalAnalyse» program. In total 3263 garnet grains were studied. The study of the compositions of garnets was carried out using an electron probe analyser. Results and Discussion: The research results show that the kimberlite bodies of the Mirny field, despite a similar set of different garnet parageneses, differ significantly by percentage. A characteristic feature of the garnets of the studied bodies was high total content of varieties of eclogitic paragenesis, especially garnets from weakly diamondiferous magnesian eclogites. Conclusions: The use of the «MineralogicalAnalyse» program allows not only reliably determine the par agenetic specialization of garnets, but also identify concentrate aureoles in the process of searching for new kimberlite bodies.