Mineralization, deposit type and metallogenic age of the gold antimony polymetallic belt in the eastern part of North Himalayan

The deposit type and metallogenic age of the gold antimony polymetallic belt in the eastern part of North Himalayan is poorly constrained. Based on the detailed field geological survey and comprehensive studies, together with the previous researches, the authors propose that this belt experienced three pulses of mineralization during the syn-depositional, syn-collisional and intra-continental periods, respectively. We delineate five types of ore deposits including exhalative sedimentation-reworked, Carlin-Carlin-like, hot spring, subvolcano magmatic hydrothermal, and orogenic types, and point out four ore controlling factors. The crossover of the basin and the mountain in the Lake Yamdrok-Lake Zhegu passive continental margin rift valley is the favorable ore-forming area. The gold deposits are mainly controlled by nearly EW-trending detachment structures and the secondary structures; the antimony and antimony polymetallic deposits are mainly controlled by near SN-trending strike-slip normal faults and the corresponding secondary structures. Particularly, the intersection of the two types of structures is the most favorable prospecting area. Furthermore, we argue that the three mineralization districts are controlled by SN-trending strike-slip normal faults and two mineralization districts are controlled by EW-trending detachment structures, which will be helpful for the prospecting deployment.