Fenite

Classification：Metamorphic Rock

It is distributed in the contact zone between carbonatite and alkaline rock mass and surrounding rock, and the protolith is granite. Alkali metasomatic nishang long diagenesis is the formation of fenite variable function.

According to the characteristics of the new mineral assemblage, structural structure, chemical composition, spatial distribution and material sources formed during the Fenite process, the Fenite can be divided into 5 types: low grade, intermediate, advanced, contact and pulse. The main factors for controlling the Fenite are: the petrological characteristics and the invasion of the carbonatite or alkaline rock. The source, nature and composition of the fluid; (3) the mineral assemblage, structural structure and chemical composition of the surrounding rock; (4) the temperature and pressure conditions in the process of Fenite. The geological and geochemical characteristics of the carbonatite are easily altered by the influence of later geological action, so that it is difficult to distinguish from the sedimentary metamorphic Dali rock facies. However, Fenite can remain relatively stable, so the study of Fenite is helpful to identify the related carbonatite. This paper compares the alkaline alteration surrounding rock of Baiyunebo deposit with the Fenite associated with carbonatite, and investigates whether they are similar, which is the key to solving the cause of the deposit.