Review of the data on strain fields of Mesozoides of Northeast of Asia obtained by kinematic method

Gonchar, V. V.

doi:10.24028/gzh.0203-3100.v38i4.2016.107800

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(2 citation statements)

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“…However, this event was less intense and mainly resulted in the reactivation of pre-existing thrusts. The general E-W trend of compression corresponds to the deformation of the Verkhoyansk FTB and not of the OFZ, which exhibits differently oriented folds and faults (Parfenov et al 1995;Prokopiev & Deikunenko, 2001;Gonchar, 2016).…”

Section: A Timing Of Northern Verkhoyansk Ftb Deformationmentioning

confidence: 99%

“…Two deformation events were also supported by direct observations of folds with NW-SE and N-S trends and the recognition of two thrust faulting stress fields with NE-SW and E-W compression axes. However, the NW-SE trending folds and their corresponding stress field were interpreted to be younger and related to the formation of the OFZ (Parfenov, 1988;Mikulenko et al 1997;Prokopiev & Deikunenko, 2001;Gonchar, 2016). More recently, important age constraints resulted from U-Pb dating of mafic dykes and apatite fission track (AFT) studies: three mafic dykes of variable orientation but always cutting N-S-trending folds were mapped to the east from the Danil River area and yielded 86 ± 1, 86 ± 4 and 89 ± 2 Ma U-Pb zircon ages (Fig.…”

Section: A Timing Of Northern Verkhoyansk Ftb Deformationmentioning

confidence: 99%

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Tectonic evolution of the northern Verkhoyansk Fold-and-Thrust Belt: insights from palaeostress analysis and U–Pb calcite dating

et al. 2022

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A combined structural and geochronological study was carried out to identify the tectonic evolution of the northern Verkhoyansk Fold-and-Thrust Belt, formed on the east margin of the Siberian Craton during late Mesozoic collision. Fault and fold geometries and kinematics were used for palaeostress reconstruction along the Danil and Neleger rivers cross-cutting the central and western parts of the Kharaulakh segment of the northern Verkhoyansk. Three different stress fields (thrust, normal and strike-slip faulting) were identified after separation from heterogeneous fault-slip data. Thrust and normal faulting stress fields were found in both areas, whereas a strike-slip faulting stress field was only found in Neoproterozoic rocks of the Neleger River area. U–Pb laser ablation – inductively coupled plasma – mass spectrometry (LA-ICP-MS) dating of calcite slickenside samples reveals the following succession of major deformation events across the northern Verkhoyansk: (i) The oldest tectonic event corresponding to the strike-slip faulting stress field with NE–SW-trending compression axis is Early Permian (Cisuralian, 284 ± 7 Ma) and likely represents a far-field response to the late Palaeozoic collision of the Kara terrane with the northern margin of the Siberian Craton. (ii) A slickenfibrous calcite age of 125 ± 4 Ma is attributed to the Early Cretaceous compression event, when the fold-and-thrust structure was formed. (iii) U–Pb slickenfibre calcite ages of 76–60 Ma estimate the age of a Late Cretaceous – Palaeocene compression event, when thrusts were reactivated. Slickensides related to both (ii) and (iii) compressional tectonic events formed by similar stress fields with W–E-trending compression axes. (iv) From the Palaeocene onwards, extensional tectonics with approximately W–E extension predominated.

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Section: A Timing Of Northern Verkhoyansk Ftb Deformationmentioning

confidence: 99%

Section: A Timing Of Northern Verkhoyansk Ftb Deformationmentioning

confidence: 99%