Yurmatinian/Karatavian Boundary in the Riphean Stratotype: Comparison of the Geochemical Features of Clay Rocks of the Avzyan Formation and Biryan Subformation (Zilmerdak Formation)

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

The results of a comparison of various ratios of trace elements-indicators of the composition of provenances for clay rocks of the Middle Riphean Avzyan Formation and the Upper Riphean Biryan Subformation of the Zilmerdak Formation (Bashkirian meganticlinorium, Southern Urals) are analyzed. The formation of these two objects is separated by a hiatus, with the maximum duration up to 250 Ma. The study is based on materials related to the content of trace elements in clay/fine-grained clastic rocks, respectively, of the Avzyan Formation (28 samples) and Biryan Subformation (16 samples) from the collections of E.Z. Gareev and the author, obtained by the ICP-MS method at the IGG Ural Branch of the Russian Academy of Sciences (Yekaterinburg). Distribution of individual and average data points of clay rocks of the named objects on La/Sc–Th/Co, Sc–Th/Sc, Eu/Eu*–Th/Sc, Ni–V–10Th, Th–La–Sc, Y/Ni–Cr/V, Cr/Th–Th/Sc, and Hf–La/Th diagrams are significantly comparable. The chondrite-normalized spectra of rare earth elements (REE) are also comparable. Only on the Th–Th/U diagram, the distribution of data points has a slightly different form, suggesting that either the provenance composition was invariable for almost 250 Ma, the duration of the pre-Upper Riphean hiatus was not so long, the author’s analytics are “lame”, or there are other reasons.

Abstract Image

Riphean地层中的Yurmatinian/Karatavian界线:阿夫齐安岩层和比尔扬亚岩层(齐勒梅达克岩层)粘土岩地球化学特征比较
本研究分析了对中里皮安-阿夫齐安地层(Middle Riphean Avzyan Formation)和齐勒梅尔达克地层(Zilmerdak Formation)上里皮安-比尔扬子层(Upper Riphean Biryan Subformation)(乌拉尔南部巴什基尔巨型地层)粘土岩的各种微量元素比率--产地组成的指标--进行比较的结果。这两个地层的形成之间有一个间断期,最长持续时间达250Ma。研究基于俄罗斯科学院 IGG 乌拉尔分院(叶卡捷琳堡)通过 ICP-MS 方法分别从 E.Z. Gareev 和作者的藏品中获得的与阿夫齐安构造(28 个样本)和比尔扬亚构造(16 个样本)的粘土/细粒碎屑岩中微量元素含量有关的材料。命名对象的粘土岩在 La/Sc-Th/Co、Sc-Th/Sc、Eu/Eu*-Th/Sc、Ni-V-10Th、Th-La-Sc、Y/Ni-Cr/V、Cr/Th-Th/Sc 和 Hf-La/Th 图上的单个和平均数据点的分布具有明显的可比性。稀土元素(REE)的软玉归一化光谱也具有可比性。只有在Th-Th/U图上,数据点的分布形式略有不同,这表明,要么在将近250 Ma的时间里来源成分是不变的,要么前上里皮安时期的间断时间并不长,要么作者的分析 "蹩脚",要么还有其他原因。
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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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