Lithogeochemical Characteristics and Sedimentary Environments of the Uk Formation Limestones (Upper Riphean, Southern Urals)

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
A. V. Maslov, S. A. Dub
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Abstract

Lithogeochemical characteristics of limestones of the Uk Formation (uppermost unit of the Riphean stratotype section in the Southern Urals) are considered. Data points of limestones (40 samples), accumulated on the middle and inner ramps have a quite contrasting distribution on the (La/Sm)sh, (La/Yb)sh, and (Sm/Yb)sh diagrams based on the systematization of numerous analytical data on carbonate sequences in various plate-tectonic (paleogeographic in the broad sense) environments, according to (Zhang et al., 2017). The data points of limestones of the Medved Member of the Uk Formation deposited on the middle ramp, according to a detailed lithofacies analysis, are shifted in these diagrams toward the field of limestones of open ocean, whereas limestones of the Manaysu Member (inner ramp) correspond to the near-coastal deposits in terms of their geochemical characteristics. Thus, the geochemical characteristics of the Uk limestones generally confirm the conclusions based previous reconstructions. In the described example, the distribution of trace elements in the inner ramp limestones was controlled apparently by the fine-grained aluminosiliciclastic material transported from the continent, whereas influence of the open ocean environment is already perceptible in geochemical features of the middle ramp limestones deposited in the deeper sea.

Abstract Image

Abstract Image

乌克地层灰岩的岩石地球化学特征和沉积环境(乌拉尔南部,上里皮安时期)
摘要 考察了乌克地层(乌拉尔南部里氏地层剖面的最上层单元)灰岩的岩石地球化学特征。根据对各种板块构造(广义上的古地理)环境中碳酸盐序列的大量分析数据的系统化(Zhang 等,2017 年),在中斜坡和内斜坡上积累的灰岩数据点(40 个样本)在 (La/Sm)sh、(La/Yb)sh 和 (Sm/Yb)sh 图上的分布对比鲜明。根据详细的岩相分析,沉积在中斜坡上的 Uk Formation Medved 成员的灰岩数据点在这些图中向开阔洋灰岩领域移动,而 Manaysu 成员(内斜坡)的灰岩在地球化学特征上与近海岸沉积物相对应。因此,乌克兰石灰岩的地球化学特征总体上证实了之前重建的结论。在所描述的例子中,内斜坡灰岩中微量元素的分布显然受到从大陆运来的细粒铝硅酸盐碎屑物质的控制,而在深海沉积的中斜坡灰岩的地球化学特征中已经可以感受到公海环境的影响。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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