Late Mesozoic Granitoid Magmatism in the Evolution of the Eastern Flank of the Mongol-Okhotsk Orogenic Belt (Russia)

In this article, for the first time, a comparison is made of magmatic events that occurred in northern and southern framing eastern flank Mongol-Okhotsk orogenic belt. It established these simultaneously. The igneous rocks accompanying are identical their material characteristics. And geochemical characteristics reflect geodynamic processes took place frame Mongolian-Okhotsk belt at end Mesozoic. Igneous represented by wide range rocks: from plutonic to volcanic. composition also wide. But main component belongs granitoids. At initial stage Late Mesozoic geological events, granitoids adakitic series (149–138 Ma) were formed. Then formations calc-alkaline (140–122 begin form. However, both second stages formed under suprasubduction conditions. difference values Sr-Nd isotopes. This reflects spatial affiliation. frame, they break through widely developed Archean Proterozoic formations, only ones.