Abstract
This article presents the results of long-term stratigraphic studies on the territory of the Kuldzhuktau mountains. Schemes for the division and correlation of Devonian deposits have been created based on complete biostratigraphic data that most effectively reflect the geological age of local stratigraphic units and their reliable correlation with geological age. The tier units of the International Devonian Stratigraphic Scale are substantiated at the present stage of research. Due to the widespread use of conodonts, it was possible to clarify the physical and age volumes, as well as the sequence of Devonian deposits in the territory of Kuldzhuktau, and almost completely reconstruct the Devonian section.
Highlights
The relevance of the research substantiated the creation of a scheme of dissection and correlation of Devonian deposits in the Kuldzhuktau mountains in the Southern Tien Shan.The USA Journals Volume 02 Issue 12-2020Tectonically, the Kuldzhuktau Mountains are a complex folded structure consisting of a series of narrow, highly compressed asymmetric folds with a sharply emphasized linear orientation of their axes in the northwest direction
For the territory of Central Asia, the characteristics of the Devonian conodont biostratigraphy are reflected in the works: Mashkov, 1978 [19]; Kim, et al, 1978-2012 [1315]; Bardashev, 1986 [4]; Apekina 1989 [4]; Yolkin et al, 1994 [30], 1997 [31], 2008 [32], 2011 [33]; Nikolaeva et al, 2017 [24] and others
By comprehensively substantiating the age volumes of the Lower and Middle Devonian sediments using the data obtained on conodonts, it was possible to significantly clarify their age volumes, and significantly enrich the arsenal of the biostratigraphic method for decoding the stratigraphic sequence of strata in the tectonically complex regions of the Kuldzhuktau Mountains (Fig. 1)
Summary
The relevance of the research substantiated the creation of a scheme of dissection and correlation of Devonian deposits in the Kuldzhuktau mountains in the Southern Tien Shan.The USA Journals Volume 02 Issue 12-2020Tectonically, the Kuldzhuktau Mountains are a complex folded structure consisting of a series of narrow, highly compressed asymmetric folds with a sharply emphasized linear orientation of their axes in the northwest direction. The relevance of the research substantiated the creation of a scheme of dissection and correlation of Devonian deposits in the Kuldzhuktau mountains in the Southern Tien Shan. Several formations in the age range from Ordovician to Carboniferous take part in the geological structure of the Kuldzhuktau mountains, which are grouped into two tectonic plates linearly elongated in the latitudinal direction: autochthon (northern block) and allochthon (southern block). These plates have a similar structure with slight differences in the base and upper parts of the section (Mirkamalov et al, 2020 [23]). The aim of the research is to correlate the Devonian deposits of the Kuldzhuktau Mountains on more complete biostratigraphic data that most effectively reflect the geological age of local strata and their reliable correlation with the longline units of the International Devonian Stratigraphic Scale at the present stage of research
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