Abstract
Research subject. In this paper, we set out to investigate main paleostructures in Kazakhstan. In particular, we attempt to clarify or revise their existing geodynamic structures and to show key stages in their development on the basis of new data on the age of some stratigraphic units and rocks of the ophiolitic association. Materials and methods . The work was based on the materials of long-standing geological research performed by the authors, including government-funded geomapping, tectonic zoning and paleoreconstruction, as well as the revision of literature data. Results . It is shown that the main sedimentary, volcanogenic, volcanogenic-sedimentary and intrusive complexes were originated in the western part of the Central Asian fold belt (Paleozoic Kazakhstan) in place of various structures differing in their geodynamic environment and tectonic history throughout the Proterozoic and entire Paleozoic periods. The Epigrenville microcontinent disintegrated into individual massifs has been described, along with rift depressions, basins with oceanic crust, island arcs and island arc systems, the Epicaledonian continent, continental depressions, regional volcano-plutonic belts and marginal basins . The tectonic zonality of Kazakhstan has been presented in the form of diagrams. The mapping of the Precambrian Ulutau massif has been conducted. The distribution of the Devonian complexes and the Late Paleozoic complexes of Kazakhstan is schematically represented. Conclusions . We have refined and partially revised the existing concepts and tectonic consecution on the territory of Kazakhstan. On the basis of paleoreconstructions, key stages in the development of main paleostructures have been established; features of the geological evolution of Kazakhstan paleozoids and their relationship with tectonic processes in the Central Asian fold belt have been determined. It is shown that the modern structure of Kazakhstan paleozoids was evolving over a long period and in many stages for almost 900 million years.
Highlights
Volcanogenic, volcanogenic-sedimentary, and intrusive complexes originating in the western part of the Central Asian fold belt (Paleozoic Kazakhstan) in place of various structures differing in their geodynamic environment and tectonic history throughout the Proterozoic and entire Paleozoic are described
It is shown that the formation of the modern structure of Kazakhstan’s paleozoids took place over a long period and in many stages for almost 900 Ma
(2015) Неопротерозойские риолиты Улутауского докембрийского массива (Центральный Казахстан): структурное положение и обоснование возраста
Summary
Поступила в редакцию 01.08.2018 г., принята к печати 26.09.2018 г. На основе обобщения новых данных о возрасте ряда стратиграфических подразделений и пород офиолитовой ассоциации предпринята попытка уточнить или пересмотреть существующие геодинамические построения и показать основные этапы развития главных палеоструктур на территории Казахстана. Работа основана на многолетних геологических исследованиях авторов, включающих государственное геокартирование, тектоническое районирование, палеореконстукции и обобщение литературных данных последних лет. Охарактеризованы основные осадочные, вулканогенные, вулканогенноосадочные и интрузивные комплексы, возникшие в западной части Центрально-Азиатского складчатого пояса (палеозоиды Казахстана) на месте разнотипных структур, которые различались геодинамическими обстановками и историей тектонического развития на протяжении протерозоя и всего палеозоя. Уточнены и частично пересмотрены существующие построения и ход тектонических событий на территории Казахстана. На основе палеореконструкций установлены основные этапы развития главных палеоструктур, особенности геологической эволюции палеозоид Казахстана и их связь с тектоническими процессами в Центрально-Азиатском складчатом поясе. Что формирование современной структуры палеозоид Казахстана происходило длительно и многоэтапно на протяжении почти 900 млн лет. Ключевые слова: геодинамический комплекс, каледониды, варисциды, палеозоиды Казахстана, ЦентральноАзиатский складчатый пояс
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