Age, composition and paleomagnetism of dolerite-gabbro dolerite intrusions of the Anabar massif western slope: on the issue of the Vendian magmatism isolation in the region

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Abstract

According to the Anabar massif western slope geological survey in the Kotuy River middle reaches, the Kotuy intrusive complex was identified. It represented by dolerite-gabbrodolerite sills and dikes of Vendian age (556 ± 28 Ma). A number of sills are characterized by 30–80 m thickness, and dikes often have a length of the top tens km. The complex distribution area is the first hundreds of km2. At the same time, the geodynamic reasons for the formation extensive intrusive bodies in the north of Siberia in the Vendian are not clear. We present new geochronological, geochemical and paleomagnetic data indicating that at least part of the Kotuy magmatic complex intrusions in the middle reaches of the Kotuy River should be attributed to the ~1500 Ma Kengede magmatic complex (Kuonamka large magmatic province). In this light, the question arises about the correctness of the allocation of the stage of intrusive magmatism of the Vendian age on the western slope of the Anabar massif.

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About the authors

A. M. Pasenko

Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences

Author for correspondence.
Email: a.m.pasenko@iperas.ru
Russian Federation, Moscow

S. V. Malyshev

St. Petersburg State University

Email: a.m.pasenko@iperas.ru
Russian Federation, St. Petersburg

A. A. Pazukhina

Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences; St. Petersburg State University

Email: a.m.pasenko@iperas.ru
Russian Federation, Moscow; St. Petersburg

A. D. Savel’ev

St. Petersburg State University; Karpinsky Russian Geological Research Institute

Email: a.m.pasenko@iperas.ru
Russian Federation, St. Petersburg; St. Petersburg

G. V. Lipenkov

Karpinsky Russian Geological Research Institute

Email: a.m.pasenko@iperas.ru
Russian Federation, St. Petersburg

K. R. Chemberlain

University of Wyoming

Email: a.m.pasenko@iperas.ru

Department of Geology and Geophysics

United States, Laramie

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2. Fig. 1. Map-scheme of the geological structure of the western slope of the Anabar massif (after [6]) (a); schematic stratigraphic column of the western slope of the Anabar massif (b) and concordia for 4 IDTIMS analyses of baddeleyite grains of the Orevun sill (c). 1 - Ordovician-Silurian; 2 - Cambrian; 3 - Starorechenskaya suite Vendian; 4 - Billyakh series; 5 - Mukun series; 6 - formations of the Archean-Proterozoic basement; 7 - intrusive bodies of the Kotuy igneous complex; 8 - intrusive bodies of the Early Triassic igneous complex; 9 - points of sampling paleomagnetic (black) and geochronological (yellow) samples; 10 - basement rocks; 11 - conglomerates, gravelites; 12 – siltstones, argillites; 13 – sandstones; 14 – dolomites; 15 – stromatolitic limestones, dolomites; 16 – limestones; 17 – intrusive rocks of basic composition; 18 – effusive rocks of basic composition. * – review of isotopic datings (see [9]).

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3. Fig. 2. Results of petropalaeomagnetic studies of intrusive bodies of the Kotuy complex. Results of stepwise temperature cleaning: a) Zijderveld diagrams; b) stereograms of the direction of the EOH vector; c) micrographs in a scanning electron microscope of the structures of high-temperature decomposition of titanomagnetite crystals; d) graph of the dependence of magnetic susceptibility on temperature; d) stereogram of magnetization directions for the bodies of the Kotuy complex, the Kuonamskaya large igneous province and the Vendian rocks of the Siberian platform [14]; e) Day-Dunlop diagram.

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4. Fig. 3. Geochemical characteristics of the rocks of the Kotuy complex of the Kotuy River, the Kotuykan River (according to data from [4]) and the Kuonamskaya CMP [8]. a) Multi-element diagram with element concentrations normalized to the primitive mantle [16]; b) Th/Yb–Nb/Yb diagram [17].

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