Инд. авторы:	Polyansky O.P., Prokopiev A.V., Koroleva O.V., Tomshin M.D., Reverdatto V.V., Selyatitsky A.Y., Travin A.V., Vasiliev D.A.
Заглавие:	Temporal correlation between dyke swarms and crustal extension in the middle Palaeozoic Vilyui rift basin, Siberian platform
Библ. ссылка:	Polyansky O.P., Prokopiev A.V., Koroleva O.V., Tomshin M.D., Reverdatto V.V., Selyatitsky A.Y., Travin A.V., Vasiliev D.A. Temporal correlation between dyke swarms and crustal extension in the middle Palaeozoic Vilyui rift basin, Siberian platform // Lithos. - 2017. - Vol.282-283. - P.45-64. - ISSN 0024-4937. - EISSN 1872-6143.
Внешние системы:	DOI: 10.1016/j.lithos.2017.02.020; РИНЦ: 29500669; SCOPUS: 2-s2.0-85016159697; WoS: 000401388100005;
Реферат:	eng: This paper presents results from new 40Ar/39Ar isotope dating of nine mafic dykes from three large dyke swarms (Vilyui–Markha, Kontai–Dzherba, and Chara–Sinsk) of the Yakutsk–Vilyui large igneous province (LIP), in addition to a reconstruction of the subsidence history of the middle Palaeozoic Vilyui paleorift basin (eastern Siberian platform). All previously published 40Ar/39Ar and U–Pb dates are summarized. Statistical analysis of the dyke ages reveals repeated magmatic events in the study area. Two major pulses of mafic magmatism are identified: one at the Frasnian–Famennian boundary, with a main peak at ca. 374.1 Ma, and another in the latest Devonian with a peak at ca. 363.4 Ma. The time of maximum intensity of dyke intrusion coincides (within uncertainty) with rapid subsidence in the Vilyui basin. The minimum total volume of middle Palaeozoic magmatism produced in the Yakutsk–Vilyui LIP is 100–215 K km3, which is much less than earlier estimates. Most of the mafic material within the Yakutsk–Vilyui LIP is related to the Vilyui basin and associated dyke swarms. Backstripping analysis of sedimentation in depressions of the Vilyui basin was carried out. Estimates were obtained for the spatial distribution of the stretching factor of the crust and mantle lithosphere, averaging 1.17 and 1.44, respectively. The amount of extension due to dyke intrusion is estimated to be ~ 6%. Backstripping analysis of sedimentation in the Vilyui basin was used to assess the effect of both intraplate far-field forces and upwelling magma flows initiated by a mantle plume. A numerical thermomechanical model was developed to investigate the relations between two possible mechanisms by which the Vilyui rift was initiated: intraplate extension (passive rifting) and the ascent of a mantle magmatic diapir (active rifting). A model considering both of these mechanisms shows the contribution of the far-field extension forces and the effect of convective flows around the mantle plume, assuming a temperature of 1500 °C for a heat source operating for ≥ 10 Myr. The best-fit model predicts the formation of the Vilyui basin under extensional conditions with a depth-integrated horizontal driving force of 2.0 × 1013 N/m, which corresponds to a lithostatic pressure of 0.73. © 2017 Elsevier B.V.
Ключевые слова:	Siberian platform; Rifting; Backstripping analysis; 40Ar/39Ar isotope ages; Numerical modelling; Yakutsk–Vilyui LIP;
Издано:	2017
Физ. характеристика:	с.45-64
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