Organic-walled dinoflagellate cysts from the Bathonian ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland - a palaeoenvironmental approach

• Autorzy: Gedl P.
• Języki publikacji: EN

Abstrakty

EN

A succession of Middle-Upper Bathonian (Subcontractus.Retrocostatum zones) ore-bearing clays exposed at Gnaszyn has been investigated for the presence of dinoflagellate cysts. The assemblages are dominated by Ctenidodinium. However, analysis of diversity shows some subtle differences throughout the succession, possibly related to the palaeoenvironmental conditions in the photic zone. Impoverished assemblages, dominated by Ctenidodinium, occur mainly in monotonous muddy intervals. More diverse assemblages, albeit also dominated by Ctenidodinium, occur in intervals which contain siderite concretion levels. The taxonomic composition of the former assemblage seems to reflect slightly restricted conditions in the photic zone, possibly related to a minor reduction in salinity and/or increase in nutrient availability. More diverse dinoflagellate cyst assemblages reflect periods of less intense terrigenous influx and relatively higher, possibly normal, salinity. These changes were possibly caused by variable intensity of freshwater influx into the basin, controlled by sea-level fluctuations. Sea-level changes may be related to migrations of Tethyan water masses, which were probably partly responsible for the composition of the dinoflagellate cyst assemblages.

Słowa kluczowe

EN

Bathonian; dinoflagellate cysts; Kraków-Silesia Homocline; Middle Jurassic; ore-bearing clays; palaeoenvironment; Poland

PL

baton; dinocysty; iły rudonośne; jura środkowa; monoklina śląsko-krakowska; paleośrodowisko; Polska

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 2012
• Tom: Vol. 62, no. 3
• Strony: 439--461
• Opis fizyczny: Bibliogr. 33 poz.,

Twórcy

autor

Gedl P.

• Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002 Kraków, Poland,

Bibliografia

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