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对蒙古国南戈壁Harshatewula地区二长花岗岩进行LA-ICP-MS锆石U-Pb精确定年。结果表明,该岩体LA-ICP-MS锆石U-Pb年龄为326.4±1.1Ma,成岩时代为早石炭世。本次所测岩体年龄是迄今为止该区获得的较为可靠的直接测年数据,为北山构造带、哈尔力克-大南湖岛弧带与蒙古戈壁-天山古生代岛弧岩浆岩带为一条古生代岛弧岩浆岩带的认识提供了年龄依据,对该区构造地质演化研究具有重要意义。
LA-ICP-MS zircon U-Pb dating of monzite granulites in Harshatewula area, South Gobi, Mongolia. The results show that the LA-ICP-MS zircon U-Pb age of the rock body is 326.4 ± 1.1Ma and the diagenetic period is Early Carboniferous. The measured rock age is by far the more reliable direct dating data obtained in this area. It is a Paleozoic for the Beishan tectonic belt, and the Halrick-Tai Nanhu island arc belt and the Mongolia Gobi-Tianshan Paleozoic island arc magmatism belt The understanding of the island arc magmatic belt provides the age basis and is of great significance to the study of tectonic evolution in this area.