The С–О–Sr–S Isotope Geochemistry and Chemostratigraphic Correlation of Ordovician Deposits in the Vilyui Structural-Facies Zone, Siberian Platform

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Lithology and Mineral Resources Pub Date : 2022-11-11 DOI:10.1134/S0024490222060050

B. G. Pokrovsky, A. V. Zaitsev, M. I. Bujakaite, A. V. Dronov

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引用次数: 1

Abstract

The C–O–Sr isotope composition of carbonates and the S–Sr isotope composition of gypsum were studied in the Ordovician section and the Upper Cambrian–Lower Silurian boundary horizons of the Vilyui structural-facies zone located in the central Siberian Platform. The upsection decrease of the ⁸⁷Sr/⁸⁶Sr ratio within 0.70920‒0.70795 and the value of δ³⁴S ~ 25‒28‰, typical for the reference sections of this stratigraphic interval, indicates a good connection between the basin and the World Ocean in the Ordovician and Early Silurian, but its isolation in the Late Cambrian (Kholomolokh Formation) when the ⁸⁷Sr/⁸⁶Sr ratio (0.7085) was lower than the oceanic one. The sharp ⁸⁷Sr/⁸⁶Sr ratio decrease from ~0.7087 to 0.7080 in the Khar’yalakh Formation (~45 m thick) can be correlated with the interval from the upper Darriwilian-to-upper Sandbian stages of the ICC (Middle Ordovician Volgian horizon–Upper Ordovician Baksanian or Dolborian horizon of the Russian GSS). Based on this benchmark and lithological features of the section, we discuss the causes of wide variations in δ¹³С (‒7.2 to 1.6‰) and δ¹⁸О (16.9‒29.8‰) in the carbonates, as well as a possible correlation of carbon isotope excursions in the Vilyui section with the global carbon isotope events.

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西伯利亚地台维柳构造相带奥陶系沉积物С -О-Sr-S同位素地球化学与化学地层对比

研究了西伯利亚地台中部维尔留构造相带奥陶系剖面和上寒武统—下志留统边界层位碳酸盐岩C-O-Sr同位素组成和石膏S-Sr同位素组成。87Sr/86Sr比值在0.70920 ~ 0.70795范围内的上剖面下降，δ34S值在25 ~ 28‰之间，是该层段参考剖面的典型特征，说明盆地在奥陶世和早志留世与世界大洋有良好的联系，但在晚寒武世(Kholomolokh组)，87Sr/86Sr比值(0.7085)低于海洋，盆地与世界大洋的联系较为隔绝。Khar 'yalakh组(厚度约45 m) 87Sr/86Sr比值从0.7087急剧下降至0.7080，与ICC上darriwilian -上Sandbian阶段(俄罗斯GSS中奥陶统Volgian -上奥陶统Baksanian或Dolborian层)的间隔有关。在此基础上，结合该剖面的岩性特征，探讨了碳酸盐岩中δ13С(-7.2 ~ 1.6‰)和δ18О(16.9 ~ 29.8‰)变化幅度较大的原因，以及Vilyui剖面碳同位素偏移与全球碳同位素事件的可能相关性。

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来源期刊

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

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.