Abstract
The Laptev Sea Rift System, on the north-eastern continental margin of the Russian Arctic, is a key area to understand the opening of the Eurasia Basin. The rifts developed since Cretaceous/Early Cenozoic times and consists of five, roughly north–south trending depocentres, controlled by major listric normal faults. Three cross-sections from the rift system were incrementally restored to quantify the amount of extension over time and to reconstruct the geological evolution. We show that since the beginning of rifting, fault activity in the Anisin Basin was unevenly distributed between two symmetrical graben systems. The central Ust’ Lena Rift has a completely different structure: regularly spaced west-dipping faults are interrupted by minor east-dipping faults in only three places. Fault dip decreases from west to east, from 60° to 30°, respectively.
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