Abstract

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Title:: Characteristics of Sub-continental Lithospheric Mantle Underneath Yakutia Area of Siberia

Author(s):: SUN Jing; XIE Qing-bin; College of Geosciences, China University of Petroleum, Beijing 102249, China

Keywords:: craton; sub-continental lithospheric mantle; peridotite; Re-Os isotope; mantle metasomatism; thinning; Yakutia area; Siberia

Abstract:: Siberian craton is one of the stable craton in the world. Yakutia area, which locates in the northeast of Siberian craton, has a large number of kimberlite outcrops and is also one of the important place of diamond deposit. Previous studies displaced that diamond only occurred in the kimberlite erupted in 360 Ma, but the kimberlites erupted in 160 Ma had no diamond occurrence, indicating the character change of sub-continental lithospheric mantle beneath Yakutia area from 360 Ma to 160 Ma. The petrology, mineralogy, geochemistry and chronology characters of xenoliths from the kimberlite erupted in different episodes of Yakutia area were summarized and compared. The sub-continental lithospheric mantle underneath Yakutia area is varied from 360 Ma to 160 Ma on ages and thickness. This difference may be associated with the Siberian collisional amalgamation event in 1.9 Ga, rather than the super mantle plume around 250 Ma in the southwest.