期刊
BULLETIN OF GEOSCIENCES
卷 86, 期 2, 页码 259-268出版社
CZECH GEOLOGICAL SURVEY
DOI: 10.3140/bull.geosci.1243
关键词
Devonian; Lochkovian-Pragian boundary; Prague Synclinorium; magnetic susceptibility; gamma-ray spectrometry
资金
- [GAAV IAAX00130702]
- [GACR 210/10/2351]
- [MSM 0021620855]
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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