Geological characteristics and LA-ICP-MS zircon U-Pb age of Mayinebo ophiolite in Altay orogenic belt

A series of metabasic volcanic rocks are exposed in the west of Fuyun Country, Xinjiang. They are composed mostly of plagioclase amphibolite and occured in the lenticular form in Fuyun Rock Group. Geochemical studies indicate that these metabasic volcanic rocks have characteristics of N-type MORB (mid-ocean ridge basalt). LA-ICP-MS zircon U-Pb dating analysis was performed for metabasic volcanic rocks in the west of Fuyun Country, and the results showed that the formation age of the plagioclase amphibolite is 437±12Ma, suggesting Early Silurian. The study of Mayinebo ophiolite provides new supplementary information for the investigation of Zayson-Ertix ophiolic tectonic rock zone and its geological evolution history as well as for the establishment of its Paleozoic tectonic framework in this area.