Degree of Pyritization (DOP) and Indicator of Anoxicity (IA) in Jurassic sedimentary rocks from Bulgaria

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.2022.83.3.149

L. Metodiev, M. Georgieva, T. Stoylkova

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Abstract

The Degree of Pyritization (DOP) and the Indicator of Anoxicity (IA) were used as tools to assess the degree of redox conditions in Lower and Middle Jurassic strata from Bulgaria. Normally-oxygenated (with DOP values < 0.45 and IA values < 0.4), oxygen-restricted (0.45 < DOP < 0.7; 0.4 < IA < 0.5), and oxygen-depleted (DOP > 0.7 and IA > 0.5) bottom-water conditions were recognized on a selection of samples, mainly from the Ozirovo Formation (upper Pliensbachian–Toarcian), but also from the Etropole Formation (lower Bajocian). DOP and IA yielded the highest values (> 0.9 for DOP and > 0.5 for IA) from samples of the lower Toarcian Tenuicostatum and Falciferum ammonite zones, and thus, denoted declined oxygen levels and enrichment of reactive Fe at the sea floor. Beyond this stratigraphic level, both parameters indicated for prevailing normally-oxygenated to oxygen-restricted setting, with limitedly imposed environments beneath stratified water-column.

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保加利亚侏罗系沉积岩中黄铁矿化程度(DOP)与缺氧指示(IA)

黄铁矿化程度（DOP）和无毒性指标（IA）被用作评估保加利亚下侏罗纪和中侏罗纪地层氧化还原条件程度的工具。在一系列样品中，主要来自Ozirovo组（Pliensbachian上部-Toarcian），也来自Etropole组（Bajocian下部），发现了正常含氧（DOP值<0.45，IA值<0.4）、限氧（0.450.7，IA>0.5）的底层水条件。从下Toarcian Tenuicostatum和Falciferum菊石带的样品中，DOP和IA产生了最高的值（DOP＞0.9，IA＞0.5），因此表明海底的氧气水平下降，活性铁富集。在该地层水平之外，这两个参数都表明了普遍的正常充氧至氧气限制环境，分层水柱下的环境受到限制。

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

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