Critical metal minerals are recently proposed resource concept worldwide and are important to the deve-lopment of strategic industries, but the level of awareness is still low. The Luozha pluton is located in the east of the Himalayan belt and invaded the Southern Tibet detachment system. On the northeast of this pluton, mica schist is captured by the tourmaline-bearing leucogranite. The mica schist is mainly composed of phlogopite, chlorite and minor biotite. Whole-rock element geochemical data indicate that the mica schist contains higher Al₂O₃ (13.38%~14.32%), K₂O (6.09%~9.66%), FeO^* (27.11%~30.09%), MgO (15.25%~17.21%), TiO₂ (0.09%~0.26%), and is enriched in Li (650×10^-6~1 031×10^-6), Rb (1 649×10^-6~2 773×10^-6), Cs (98×10^-6~229×10^-6), Tl (5.7×10^-6~12.1×10^-6), Ga (121×10^-6~148×10^-6). The geochemical data of phlogopite show that similar to the whole rock, phlogopite also is enriched in Li-Rb-Cs-Ga, and these critical metal elements are incorporated into phlogopite by replacement of K. Chronological data indicate that zircon records widespread detrital age and Cenozoic metamorphic events. Therefore, it can be concluded that the original rock of mica schist in the Luoza area is sedimentary rock, which was captured during the invasion of leucogranite and underwent low-level metamorphism. The phlogopite mineralization reported in this paper is a new type of lithium ore genesis: metamorphic transformation type. The discovery of the metals thallium and gallium in the Himalayan orogenic belt suggests that critical metals also have mineralization potential in addition to rare metals. Our data suggest that the Himalayan belt is another important target area for the exploration of critical metals. This paper provides new ideas for establishing metallogenic models of critical metals in the Himalayan orogenic belt. It is necessary to strengthen the exploration of critical metals in sedimentary or metasedimentary rocks in the Himalayan orogenic belt and the other orogenic belts in the future.