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

Authors

  • Tánu Martma Institute of Geology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
  • Antanas Brazauskas Department of Geology and Mineralogy, Vilnius University, 21/27 Ciurlionio Str., LT-2009 Vilnius, Lithuania
  • Dimitri Kaljo Institute of Geology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
  • Donatas Kaminskas Department of Geology and Mineralogy, Vilnius University, 21/27 Ciurlionio Str., LT-2009 Vilnius, Lithuania
  • Petras Musteikis Department of Geology and Mineralogy, Vilnius University, 21/27 Ciurlionio Str., LT-2009 Vilnius, Lithuania

Keywords:

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

Abstract

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 (d13 C values reach 3.2) in the lower Wenlock, (2) low shifts (1.3 and 1.6) at two levels in the uppermost Wenlock Siesartis Formation corresponding to the Monograptus ludensis Biozone, (3) the most prominent excursion (d13 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.

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Published

2010-03-27

Issue

Vol. 49 No. 2 (2005)

Section

Articles

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