Late Ediacaran glacial deposits of the Baykonur Formation, Middle Tianshan of eastern Kyrgyzstan: Age substantiation based on detrital zircon U–Th–Pb (LA-ICP-MS) geochronological study

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Abstract

The results of U-Th-Pb (LA-ICP-MS) dating of detrital zircons reveal late Ediacaran ca 556–540 Ma age of the Baykonur Formation and eponymous glaciation in the Middle Tianshan (MTS) of eastern Kyrgyzstan. The widespread occurrence of the Baykonur diamictites in Kazakhstan and the Tianshan over a distance of more than 1600 km points to a significant extent of glaciation. The association of glacial deposits with shallow-marine fine-grained siliciclastic and carbonate facies indicates lack of connection with mountain glaciers. In the Tarim Craton, which in the Precambrian represented a single continent with the MTS, the stratigraphic correlative of the Baykonur Formation is the Hankalchough diamictite which has a similar age according to chemostratigraphic data. Paleomagnetic data indicating that in the Ediacaran the Tarim and MTS located at low latitudes <30° suggest that the Baykonur glaciation covered most of the Earth's surface and represented one of the largest glacial events in the Neoproterozoic.

About the authors

D. V. Alexeiev

Geological Institute, Russian Academy of Sciences

Email: dvalexeiev@mail.ru
Moscow, Russia

A. K. Khudoley

St. Petersburg State University

St. Petersburg, Russia

A. G. Shevkunov

Kumtor Gold Company

Bishkek, Kyrgyz Republic

A. V. Kulikova

Kazan Federal University; V.S. Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences

Kazan, Russia; Novosibirsk, Russia

T. N. Aidarkulov

Kumtor Gold Company

Bishkek, Kyrgyz Republic

K. R. Minnebaev

Kazan Federal University

Kazan, Russia

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