Age, Composition, and Paleomagnetism of Dolerite–Gabbro Dolerite Intrusions of the Western Slope of the Anabar Massif: The Issue of Vendian Magmatism in the Region.

Autor: Pasenko, A. M., Malyshev, S. V., Pazukhina, A. A., Savelev, A. D., Lipenkov, G. V., Chamberlain, K. R.
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Zdroj: Doklady Earth Sciences; Feb2024, Vol. 514 Issue 2, p228-233, 6p
Abstrakt: The Kotuy intrusive complex was identified from the geological survey of the western slope of the Anabar Massif in the middle reaches of the Kotuy River. It is 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 a few dozen kilometers. The distribution area of the complex is a few hundred square kilometers. However, the geodynamic evidence for the formation of extensive intrusive bodies in the northern part of Siberia in the Vendian is 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 igneous province). In this light, the very existence of Vendian intrusive magmatism on the western slope of the Anabar massif appears questionable. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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