保加利亚西部古生代燧石的地球化学和沉积环境：初步结果

IF 0.2 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society Pub Date : 2022-12-01 DOI:10.52215/rev.bgs.2022.83.3.141

I. Boncheva, P. Andreeva, V. Sachanski

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引用次数: 0

摘要

保加利亚西部的古生代（志留纪和泥盆纪）燧石分布在三个构造单元中：Svoge、Lyubash-Golo-Bardo和Morava。这些岩石中的SiO2含量在76.06%-96.02%之间。根据收到的地球化学主要元素数据，对硅质岩的二氧化硅来源和沉积环境进行了解释。计算的Si/（Si+Fe+Al+Ca）比和在非水热场绘制的Al–Fe–Mn图表明，燧石中的大部分二氧化硅是生物成因的，或者是生物成因和陆源的。另一方面，所有研究的硅质样品在Fe2O3/TiO2与Al2O3/（Al2O3+Fe2O3）图上绘制到大陆边缘沉积物环境的区域中。计算的MnO/TiO2比率也表明沉积在大陆架或斜坡环境中。

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Geochemistry and depositional settings of Paleozoic cherts from Western Bulgaria: preliminary results

Paleozoic (Silurian and Devonian) cherts from Western Bulgaria occur in three tectonic units: Svoge, Lyubash-Golo Bardo and Morava. The SiO2 content in these rocks varies from 76.06% to 96.02%. The silica source and depositional settings of the cherts have been interpreted based on the received geochemical major element data. The calculated Si/(Si+Fe+Al+Ca) ratio and Al–Fe–Mn diagram plotting at non-hydrothermal field suggest that most of silica in the cherts is biogenic or both biogenic and terrigenous in origin. On the other hand, all studied siliceous samples plot into the field of the continental margin sediment environments on the Fe2O3/TiO2 vs. Al2O3/(Al2O3+Fe2O3) diagram. The calculated MnO/TiO2 ratio also indicates deposition in continental shelf or slope environments.

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Spisanie Na B Lgarskoto Geologichesko Druzhestov-Review of the Bulgarian Geological Society GEOSCIENCES, MULTIDISCIPLINARY-

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