Scholarly record

PALEOSTRESS AXES IN THE NORTH-EASTERN AND EASTERN FOLDED FRAMING OF THE SIBERIAN PLATFORM

Dmitry A. Vasiliev

Abstract

Along the north-eastern and eastern margins of the Siberian platform extends the foreland zone of the Verkhoyansk fold-and-thrust belt (VFTB) to the west of which is the Priverkhoyansk foredeep. On the north, the platform is bounded by the Olenek folded zone with the Lena-Anabar basin located to its south. Various authors identified a number of deformational events in the Late Mesozoic tectonic history of the region, of which the nature, kinematics and relationships are as yet poorly studied. We carried out detailed structural studies in several key areas to address these issues, involving measurements of spatial orientation of structural elements (bedding, cleavage, striation on fault slickensides, shear fractures, faults, joints, etc.). Formation of strike-slip faults in the Olenek folded zone and in the northern part of the Kharaulakh segment of the VFTB foreland was coeval with thrusting. In the southern part of the segment, strike-slip faulting occurred at the final stage of deformation, following the formation of most of the thrusts. In the more southerly Kuranakh segment of the VFTB, most strike-slip faults post-dated the fold-and-thrust deformations. Normal faults of the Olenek folded zone and the Kuranakh segment as well as most of the normal faults of the Kharaulakh segment were formed synchronously with folding and thrusting. Within the Kharaulakh segment, low-amplitude normal faults were studied, which formed as a result of Paleogene rifting that led to the formation of the Kengdey graben. The studies enabled reconstruction of the paleostress axes orientation in course of deformation stages in the study area.

Publication Impact Profile

• Captures
• Mendeley - Readers: 1

PLUMX see details

DOI resolver: doi.org/10.5593/sgem2019/1.1/s01.052

Publication details

Back to publication list