The Wenlock-Ludlow carbon isotope trend in the Vidukle core, Lithuania, and its relations with oceanic events

• Autorzy: Martma T. , Brazauskas A. , Kaljo D. , Kaminskas D. , Musteikis P.
• Konferencja: Stable isotope records of environmental change. European Society for Isotope Research. VII Isotope Workshop, Graz 2004
• Języki publikacji: EN

Abstrakty

EN

A Wenlock to Ludlow terrigenous-carbonate succession in the Vidukle core in Central Lithuania represents a deep shelf environment with a general upwards-shallowing trend, interrupted by brief deepening episodes. The carbon isotope trend, based on 115 whole-rock analyses, shows three main excursions: (1) a major excursion (δ¹³ C values reach 3.2‰) in the lower Wenlock, (2) low shifts (1.3‰ and 1.6‰) at two levels in the upper most Wenlock Siesartis Formation corresponding to the Monograptus ludensis Biozone, (3) the most prominent excursion (δ¹³ C values reach 8.2‰) occurs in the upper Ludlow Mituva Fm. The upper Ludlow excursion is dated by the last occurrences of Polygnathoides siluricus below the main shift and the appearance of Ozarkodina wimani and O. crispa above the excursion. The excursion stratigraphically coincides with the Lau oceanic Event and is correlated with the mid-Ludfordian Neocucullograptus kozlowskii-Bohemograptus bohemicus tenuis Biozone. Changes in the carbon isotope trend are in general harmony with some aspects of the rock (CaO, terrigenous component) and fossil content of the section. The data presented are consistent with an arid climate model for the Ludfordian isotope event.

Słowa kluczowe

EN

Lithuania; Silurian; carbon isotopes; oceanic events; sedimentary facies

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 2
• Strony: 223--234
• Opis fizyczny: Bibliogr. 44 poz., rys., tab., wykr.

Twórcy

autor

Martma T.

• Institute of Geology, Tallinn University of Technology, 7 Estonia Blvd., 10143 Tallinn, Estonia

autor

Brazauskas A.

• Department of Geology and Mineralogy, Vilnius University, 21/27 Ciurlionio Str., LT-2009 Vilnius, Lithuania

autor

Kaljo D.

• Institute of Geology, Tallinn University of Technology, 7 Estonia Blvd., 10143 Tallinn, Estonia

autor

Kaminskas D.

• Department of Geology and Mineralogy, Vilnius University, 21/27 Ciurlionio Str., LT-2009 Vilnius, Lithuania

autor

Musteikis P.

• Department of Geology and Mineralogy, Vilnius University, 21/27 Ciurlionio Str., LT-2009 Vilnius, Lithuania

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