NEOTECTONICS OF THE KHARAULAKH SECTOR OF THE LAPTEV SHELF
V.S. Imaev1,2, L.P. Imaeva1,2, O.P. Smekalin1,2, A.V. Chipizubov1, A.N. Ovsyuchenko3, I.I. Kolodeznikov4
1Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
2Institute of Geology of Diamond and Precious Metals, Siberian Branch of the Russian Academy of Sciences, pr. Lenina 33, Yakutsk, 677007, Russia
3Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol. Gruzinskaya 10, str. 1, Moscow, 123242, Russia
4Academy of Sciences of the Sakha Republic (Yakutia), pr. Lenina 33, Yakutsk, 677007, Russia
Keywords: Региональные сегменты, активные разломы, кинематические типы, парагенезисы активных структур, палеосейсмогенные структуры, позднекайнозойские деформации, механизм землетрясения, сейсмотектонические деформации, режимы напряженно-деформированного состояния земной коры, Хараулахский сектор Арктической зоны, Active fault, slip geometry, paleoseismogenic structure, Late Cenozoic deformation, earthquake mechanism, seismotectonics, crustal stress and strain, Kharaulakh sector, Laptev Shelf
Abstract
Seismotectonic deformation and crustal stress pattern have been studied comprehensively in major seismogenic structures of the Kharaulakh sector of the Verkhoyansk folded system and adjacent parts of the Chersky seismotectonic zone. The study focuses on neotectonic structures, deep structure, and systems of active faults, as well as tectonic stress fields inferred by tectonophysical analysis of Late Cenozoic faults and folds. The results, along with geological and geophysical data, reveal main strain directions and structural patterns of crustal stress and strain in the Arctic segment of the Eurasia-North America plate boundary. The area is a junction of mid-ocean and continental structures evolving in a mixed setting of extension, compression, and their various combinations. The rotation pole of the two plates is presumably located near Buor-Khaya Bay. In this case, extension is expected to act currently upon the neotectonic structures north of the bay and compression to control those in the south and southeast. This inference is consistent with the identified zoning of stress and strain in the Kharaulakh sector.
|
