Bulletin of the Geological Society of Malaysia, Volume 9, Nov. 1977, pp. 117 – 122

Late Mesozoic granitic magmatism in geological structures of the U.S.S.R. North-East

N.A. SHILO* AND A.P. MILOV

*National Committee of Geologists, USSR 7 Pyzhevsky, Moscow G-17, U.S.S.R.

INTRODUCTION: Geologically composite territory of the Soviet North-East was the site of granite formation on a large scale from Late Jurassic through Cretaceous time. Granitic plutons formed under various tectonic conditions, such as, in the Mesozoic Yana-Kolyma and Chukotsk miogeosynclinal folded systems, in the eugeosynclinal Alazey-Oloy system, and in the Okhotsk-Chukotsk volcanogenic belt; the last developed along the borderline between Mesozoic and Cenozoic folded areas.

In the areas where plutons formed in a miogeosynclinal framework, they consist mainly of granitic and granodioritic complexes that are apparently unrelated to volcanism. Granitic complexes of the eugeosynclinal zone and volcanogenic belt, form gabbro-granitic series which are closely associated with products of volcanic eruptions both in space and time.

https://doi.org/10.7186/bgsm09197709