Special Aspects of the Application of Lithogeochemical Indicators for Reconstructing the Paleoclimate and Composition of Source Areas in the West Siberian Late Jurassic–Lower Cretaceous Sedimentary Basin

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2023-11-14 DOI:10.1134/S0024490223700311
V. G. Eder, A. G. Zamiralova, P. A. Yan
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Abstract

For Upper Jurassic–Lower Cretaceous rocks of the Bazhenov Formation, a significant positive linear correlation of the content of Th, Hf, Sc, and La with the Al2O3 content was revealed, and their terrigenous genesis was confirmed. It has been determined that the samples, in which the distribution of Sc/Al2O3 and La/Al2O3 values does not satisfy the linear correlation, represent the mixed clayey–siliceous rocks (with P2O5 > 1 wt %) or the substantially pyritized rocks (with the pyrite content exceeding the OM content and C/S ≤ 1), as well as siliceous mudstones (with the SiO2 content > 70 wt %). It is concluded that, in addition to carbonatized rocks, rocks of the above-mentioned types, as well as rocks subjected to the late diagenetic kaolinization, should be excluded before analyzing the geochemical indicators for reconstructing the formation conditions of the Bazhenov Formation. The formation conditions of these rocks were reconstructed based on the analysis of values of several geochemical modules and indicators. Based on the study of CIA and CIW variations, it was confirmed that the Late Jurassic–Early Cretaceous climate in the West Siberian sedimentary basin was warm and semiarid, and it did not change significantly during the entire period under consideration. For rocks of the Bazhenov Formation, several indicators, such as (La/Yb)N and Eu/Eu*, as well as the distribution of trace elements in the Th‒La‒Sc triangular diagram, suggest that rocks of the Bazhenov Formation were deposited in the central and southeastern regions, with the dominant impact of source areas of mafic rocks.

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应用岩石地球化学指标重建西西伯利亚晚侏罗世-下白垩世沉积盆地古气候和源区组成的特殊方面
上侏罗统—下白垩统Bazhenov组岩石中Th、Hf、Sc、La含量与Al2O3含量呈显著的线性正相关,证实了其陆源成因。样品中Sc/Al2O3和La/Al2O3值的分布不满足线性相关关系,代表混合粘土-硅质岩石(含P2O5 >1 wt %)或大部分黄铁矿化的岩石(黄铁矿含量超过OM含量且C/S≤1),以及硅质泥岩(SiO2含量>70% wt %)。在分析地球化学指标重建巴热诺夫组形成条件时,除碳酸化岩石外,应排除上述类型的岩石以及晚成岩高岭土化作用的岩石。通过对多个地球化学模块和指标值的分析,重建了这些岩石的形成条件。通过对CIA和CIW变化的研究,证实了西西伯利亚沉积盆地晚侏罗世-早白垩世气候为温暖半干旱气候,且在整个研究时期没有明显变化。(La/Yb)N和Eu/Eu*等指标以及Th-La-Sc三角图中微量元素的分布表明,巴济诺夫组岩石主要沉积在中部和东南部地区,主要受基性岩源区的影响。
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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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