Unique diamond placers have formed in the north of the Sakha Republic (Yakutia). They abound in diamonds with light carbon isotope composition, δC13 = −22.5‰ (northern (Ebelyakh) type). Such diamonds were not found in kimberlites of the Yakutian diamondiferous province, but they were discovered in the well-known primary deposits of the Arkhangel’sk province. The primary sources of Ebelyakh diamonds are supposedly of Triassic age. Primary aureole of Ebelyakh diamonds has been revealed in Carnian (Upper Triassic) littoral sediments. Primary sources of these diamonds are predicted in the northeast of the Siberian craton in the zone of its junction with a mobile belt.
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