Palaeoclimatic event at the Lochkovian-Pragian boundary recorded in magnetic susceptibility and gamma-ray spectrometry (Prague Synclinorium, Czech Republic)

 

Authors: Vacek F

Published in: Bulletin of Geosciences, volume 86, issue 2; pages: 259 - 268; Received 9 November 2010; Accepted in revised form 15 March 2011; Online 6 May 2011

Keywords: Devonian, Lochkovian-Pragian boundary, Prague Synclinorium, magnetic susceptibility, gamma-ray spectrometry,

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Abstract

The MS and GRS stratigraphic records of three Lochkovian-Pragian boundary sections representing different depositional conditions have been evaluated. All studied sections are characterized by increased MS magnitudes from Lochkovian to Pragian. Another prominent characteristic is a turnover in the Th/U ratio; the Pragian magnitudes are usually 2–4 times higher than the Lochkovian ones. Based on a combined physical stratigraphic and sedimentological approach a previously reported regressive event at this time interval is ascribed to climate warming accompanied by enhanced carbonate productivity while eustatic sea-level changes probably played only a minor role, which was locally also combined with synsedimentary uplift.

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