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

This paper presents the results of mineralogical, geochemical, isotope, and geochemical (Sm–Nd) studies of siltstones from the upper Bystraya 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 ma...

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Bibliographic Details
Published in:Russian journal of Pacific geology 2024-04, Vol.18 (2), p.150-168
Main Authors: Smirnova, Yu. N., Kurilenko, A. V., Khubanov, V. B., Dril, S. I.
Format: Article
Language:English
Subjects:
Accumulation
Cambrian
Continental crust
Earth and Environmental Science
Earth Sciences
Geochemistry
Geology
Igneous rocks
Mineralogy
Silica
Siltstone
Subduction
Terrigenous sediments
Trace elements
Zircon
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Summary:This paper presents the results of mineralogical, geochemical, isotope, and geochemical (Sm–Nd) studies of siltstones from the upper Bystraya 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 Bystraya subformation. The mineralogical composition of the studied rocks indicates their accumulation in an environment associated with subduction 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 Bystraya 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 zircons (556 ± 9 and 566 ± 10 Ma) isolated from siltstones of the upper Bystraya subformation were used to constrain the lower limit of their accumulation at the middle Ediacaran.
ISSN:1819-7140
1819-7159
DOI:10.1134/S1819714024020076