LA-ICP-MS zircon U-Pb dating of monzogranite of Harshatewula area in South Gobi province, Mongolia, and its geological significance

High precision LA-ICP-MS zircon U-Pb dating of the Harshatewula monzogranites was conducted. The analyses indi-cate that the intrusion was formed at 327.0± 2.1Ma, belonging to Early Carboniferous. The age is a relatively reliable and directly mea-sured datum which provides the evidence for the existence of an island arc magmatite belt composed of Beishan tectonic belt, Har-like-Dananhu islandarc belt and Gobi-Tianshan island arc magmatite belt. This result has great significance for the understanding of the tectonic-geological evolution in this area.