The Ebe-Khaya dike belt 400 km long has been found north of the Siberian Platform. Within this belt, two types of magma – tholeiite-basalt and alkaline olivine-basalt – are associated in space and follow each other in time. The tholeiite magma produced Lower Triassic dolerite sills and dikes. They were involved in the development of trap syneclises and are typically platform formations. Subsequent development of the Yenisei-Khatanga and Lena-Anabar troughs caused melting at greater depths to form an alkaline olivine-basalt melt, which produced dikes of trachydolerite porphyrites as well as dikes and stock-like bodies of monzonite-porphyries. It is believed that magmatic activity ceased in the Lower Jurassic.
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