Ore types and and characteristics of melt (fluid) inclusions on the Maoniuping REE deposit Mianning, Sichuan, China

摘要

The Maoniuping REE deposit located in the northern section of the Panxi (Panzhihua and Xichang) rift zone of western margin of the Yangtze plate. It is by far the world's youngest discovered endogenous LREE deposit, and is also the world's third largest endogenous LREE deposit. Yanshanian alkaline granites are widely developed in Mianxi region, and the Maoniuping REE deposit hosts in the middle of Mianqi granite body. Surrounding rocks of REE ore body are nordmarkite and carbonatite. According to the output position, mineralization types, structure and other features, ore types of the Maoniuping REE deposit are designated as carbonatite type, pegmatite type, breccia type, and fine stockwork type. According to phase characteristics at room temperature and change of heating process, inclusions can be divided into three kinds: melt inclusions (M), melt fluid inclusions (ML) and fluid inclusions (L).