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

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Russian Journal of Pacific Geology Pub Date : 2024-05-02 DOI:10.1134/s1819714024020076

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

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Abstract

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.

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阿尔贡地块下寒武统拜斯特拉亚地层土沉积物的来源及其堆积的古地球动力学背景

摘要本文介绍了对阿尔贡大陆块上部拜斯特拉亚次构造的粉砂岩进行矿物学、地球化学、同位素和地球化学（Sm-Nd）研究的结果，以及对其中的锆英石碎片进行U-Pb定年的结果。研究的主要目的是确定碎屑物质的主要来源，重建堆积的古地球动力学环境，并确定上拜斯特拉亚亚构造的陆相岩石形成的年龄下限。所研究岩石的矿物成分表明，它们是在与俯冲过程有关的环境中堆积的。该亚构造中粉砂岩的微量元素组成表明，就二氧化硅含量而言，源区存在混合组成的岩石。根据 Sm-Nd 同位素和地球化学数据，可以确定该地层单元粉砂岩的主要碎屑物质来源是古近纪岩石和（或）更年轻的岩石，其形成与古近纪大陆地壳的再加工有关。所研究的 Bystraya 上亚构造粉砂岩样本中的大多数锆石都是新元古代和古元古代岩石。它们的来源可能是广泛分布于中国阿尔贡地块的新元古代和古元古代火成岩。从上拜斯特拉亚亚构造的粉砂岩中分离出的最年轻锆石的年龄（556 ± 9 Ma 和 566 ± 10 Ma）被用来确定它们在埃迪卡拉纪中期的堆积下限。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.