Abstract
Palaeo-, rock magnetic and geochemical studies were conducted on volcanic samples from the Listice area to improve the knowledge of Palaeozoic volcanic evolution in the Prague Basin. The magnetic data display no significant differences between two studied localities, indicating one magnetizing event for both localities. Geochemical data suggest that Listice basalt could have originated from deep melting of the garnet peridotite mantle source during the attenuation and rifting of the continental lithosphere connected with asthenospheric mantle upwelling. The dataset furthermore supports the evidence of syn- or post- intrusive fluid interactions and low-temperature stages of alteration. The Ti-magnetite within amygdales of the samples was found to be carrying the characteristic remanent magnetization and reflects probably the Permo-Carboniferous remagnetization of volcanic phases.
Highlights
The Prague Basin, Teplá–Barrandian Unit, Czech Republic, is a large Ordovician to Devonian basin which was tilted during Variscan Orogeny
The results show that χ and NRM are on average higher in SI07 than in SI08 samples (Table 1)
The results of our studies indicate the same direction and age for the Ti-magnetite carried ChRM component for both SI07 and SI08 localities
Summary
The Prague Basin, Teplá–Barrandian Unit, Czech Republic, is a large Ordovician to Devonian basin which was tilted during Variscan Orogeny. The Prague Basin, and especially its sedimentary sequence, has been extensively studied (e.g., Fiala 1970; Krs & Pruner 1995; Melichar 2004). The information about Palaeozoic volcanic evolution, and especially its palaeosetting and development, are still scarce due to lack of magnetic and geochemical data on Prague Basin volcanites, as well as due to large scatter in the existing palaeomagnetic directions (e.g., Krs et al 2001; Aïfa et al 2007; see Global Paleomagnetic Database, http://www.ngu.no/geodynamics/gpmdb/). For the purpose of this research 50 samples were collected from Lištice quarry (SI08) and roadside (SI07) outcrops during 2010–2014. Lištice volcanites were subjected to palaeomagnetic, rock magnetic and geochemical studies to gain new insights into Palaeozoic evolution and its volcanic phases
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