Geochemical Facets of the Inikan Formation as Indicators of Stratification and Hydrochemistry of the Cambrian Paleobasin

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-09-15 DOI:10.2113/rgg20234554

S.I. Merenkova, G.A. Kalmykov, A.Yu. Puzik, R.R. Gabdullin, I.V. Bad’yanova, M.A. Volkova, K.P. Kazymov, M.M. Shiroyan

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Abstract

Abstract —Geochemical studies of Inikan Formation rocks from the coastal outcrops of the Yudoma River were carried out. All analyzed lithological varieties are characterized by significant enrichment in B, Ni, Mo, Ag, Sb, U (redox-sensitive trace metals and elements associated with biodeposition). The source of the elements was sea water that leached them from the eolian material. It was found that the deposits accumulated in anoxic environments with periods of both euxinic (probably, in the bottom water mass) and suboxic conditions. Such anoxic and euxinic conditions developed due to the stable stratification of the ocean that existed in the early–middle Cambrian in this part of the basin. In addition, the long-term accumulation of organic-rich sediment under conditions of anoxia, periodic euxinia, and stable stratification indicates the presence of a geomorphologically isolated depression in this part of the basin. CIA-Kcorr ranges from 68 to 95. The low values of the CIA may be related to the height of the relief in the sedimentary source area.

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伊尼坎组地球化学面作为寒武系古盆地分层和水化学的指示

摘要对尤多马河沿岸露头伊尼坎组岩石进行了地球化学研究。所有分析的岩性品种均显著富集B、Ni、Mo、Ag、Sb、U(氧化还原敏感的微量金属和与生物沉积相关的元素)。这些元素的来源是从风成物质中浸出的海水。发现沉积物在缺氧环境中沉积，同时具有缺氧(可能在底部水体中)和缺氧条件。这种缺氧和缺氧条件的形成是由于早-中寒武纪海洋的稳定分层作用。此外，在缺氧、周期性缺氧和稳定分层条件下，富有机质沉积物的长期堆积表明该盆地在地貌上存在孤立的坳陷。CIA-Kcorr在68到95之间。CIA值较低可能与沉积源区地形高度有关。

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.