Sources of Terrigenous Sediments of the Lower Cambrian Bystraya Formation of the Argun Massif and Paleogeodynamic Settings of Their Accumulation

Smirnova, Y.N.; Kurilenko, A.V.; Khubanov, V.B.; Dril, S.I.

Авторы: Smirnova Yu N., Kurilenko A.V., Khubanov V.B., Dril S.I.
Журнал: Russian Journal of Pacific Geology
Том: 18
Номер: 2
Год издания: 2024
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 150
Последняя страница: 168
Оригинальные версии: ИСТОЧНИКИ И ПАЛЕОГЕОДИНАМИЧЕСКАЯ ОБСТАНОВКА НАКОПЛЕНИЯ ТЕРРИГЕННЫХ ОТЛОЖЕНИЙ НИЖНЕКЕМБРИЙСКОЙ БЫСТРИНСКОЙ СВИТЫ АРГУНСКОГО МАССИВА
DOI: 10.1134/s1819714024020076
Аннотация: Abstract—This paper presents the results of mineralogical, geochemical, isotope, and geochemical (Sm–Nd) studies of siltstones from the upper Bystrinskaya subformation of the Argun continental massif, as well as U– Pb dating of detrital zircon grains from them. The main goal of the research was to identify the main sources of clastic material, to reconstruct the paleogeodynamic environment of accumulation, and to constrain the lower age limit for the formation of terrigenous rocks of the upper Bystrinskaya subformation. The mineralog- ical composition of the studied rocks indicates their accumulation in an environment associated with subduc- tion processes. The trace element composition of siltstones from the subformation suggests the presence of rocks of mixed composition in the source area in terms of their silica content. Based on Sm–Nd isotope and geochemical data, it was established that the main sources of clastic material for siltstones of the stratigraphic unit were Paleoproterozoic rocks and (or) younger rocks whose formation is associated with the reworking of the Paleoproterozoic continental crust. Most of the zircons from the studied siltstone sample of the upper Bystrinskaya subformation are Neo- and Paleoproterozoic in age. Their sources are probably Neo- and Paleoproterozoic igneous rocks widespread within the Argun massif in China. The ages of the youngest zir- cons (556 ± 9 and 566 ± 10 Ma) isolated from siltstones of the upper Bystrinskaya subformation were used to constrain the lower limit of their accumulation at the middle Ediacaran.
Добавил в систему: Хубанов Валентин Борисович

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Sources of Terrigenous Sediments of the Lower Cambrian Bystraya Formation of the Argun Massif and Paleogeodynamic Settings of Their Accumulationстатья Исследовательская статья

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