On the basis of analysis and research of previous data, it is put forward that ophiolitic mélange of Aletunkunduo is the extended eastward part of ophiolitic belt from Kalameili, which starts from the belt of Kalameili-Tazale-Daheishan-Aletunkunduo in the west. Plagioclase granite in the ophiolitic mélange occurs in the top of gabbro, they have gradually or abruptly changing contact relationship. With SHRIMP method zircon U-Pb dating is carried out with Plagioclase granite, the result is (351±6) Ma that reflects that ophiolitic mélange of Aletunkunduo formed in 351 Ma. Meanwhile the study on ophiolitic mélange overlying rocks in the Late Carboniferous can also state that ophiolitic mélange from Aletunkunduo emplacement ages is not later than Late Carboniferous.