Silicofossils and Dinocysts of the Lower Paleogene Siliceous–Terrigenous Deposits, South Russian Plate: Their Significance for Dating of Sedimentary Sequences

Abstract. Diatoms play a major role in carbon and silicon cycles, and thus diatom-bearing sediments represent an archive of past climatic and environmental settings. In shallow-marine and freshwater environments, the accumulation of diatom frustules forms a sedimentary rock called diatomite. While most global-scale studies of diatom-bearing sediments focus on deep-sea sites, shallow-marine and freshwater diatomites are studied mainly at a regional level. To address this problem, we present a global-scale compilation of diatomite occurrences spanning the Palaeogene (∼66 to ∼23 Ma). This period was characterized by initial extreme warmth, followed by prolonged cooling, disrupted by short-term climatic events called hyperthermals and by a number of palaeoceanographic and palaeogeographic changes. The aim of this compilation is to determine the response of diatom production to Palaeogene environmental fluctuations by examining the influence of climate, tectonic activity, and ocean circulation on diatomite deposition. Although climatic factors appear to have had an indirect impact, our study suggests that palaeogeographic and palaeoceanographic changes were key drivers of diatomite deposition during the Palaeogene, particularly from the Early Eocene Climatic Optimum (∼53 to ∼49 Ma) onwards. In fact, our compilation suggests the absence of diatomite deposition in epicontinental seas between ∼46 and ∼44 Ma, whereas diatomites did not begin to accumulate in open-ocean environments until ∼43.5 Ma. Moreover, we observe that regional climate and volcano-tectonic activity have had an impact on the deposition of freshwater diatomites.

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Silicofossils and Dinocysts of the Lower Paleogene Siliceous–Terrigenous Deposits, South Russian Plate: Their Significance for Dating of Sedimentary Sequences

Cited by 3 publications

References 21 publications

Chondrichthyan fishes from the Middle Eocene Osinovaya Formation of Rostov Region, Russia

Chondrichthyan fishes from the Middle Eocene Osinovaya Formation of Rostov Region, Russia

Diatoms and Silicoflagellates from the Paleogene of the South of the Russian Plate: Implications for Biostratigraphy and Interregional Correlations

Climatic and tectonic controls on shallow-marine and freshwater diatomite deposition throughout the Palaeogene

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