CHANGE OF ARC-MAGMATISM FROM THE PALEOZOIC IN NORTHEAST JAPAN

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The one of the purposes of this project is to clarify the position and characters of the Kitakami Mountains in the Gondwanaland. Our results of the project are as follows : (1) We proposed the relation between the Middle to Late Paleozoic igneous activity in the Kitakami Mountains and the formation, development and dispersion of the Gondwanaland. (2) The tectonic relation between the Kitakami Mountains and Southwestern part of Hokkaido from the point of view on the Early Cretaceous granitic activity. (3) Characteristics of the Early Mesozoic to Late Paleozoic lithium - fluorine granites in Mongolia have been investigated from the point of view to clarify the relation of the igneous activity of the Mongolia - Okhotsk Fold belt and Northeast Japan. (4) The distribution and structure of the Late Mesozoic to Recent magmatism and tectonic movements have been investigated by using the Digital Elevation Model. From the results, new lineaments and curvilinear structures are observed in the Kitakami Mountains and granitic plutons in the Mountains.