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Fractured clasts in neotectonic reconstructions: an example from the Nowy Sącz basin, western outer Carpathians, Poland

Antoni K. Tokarski^1,2,  Anna Świerczewska¹, Witold Zuchiewicz^2,3

¹ Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Kraków, Senacka 1-3, 31-002 Kraków; E-mail: ndtokars@cyf-kr.edu.pl, ndswierc@cyf-kr.edu.pl

² Galicia Tectonic Group

³ Institute of Geological Sciences, Jagiellonian University, Oleandry 2A, 30-063 Kraków;  E-mail: witold@ing.uj.edu.pl

 Abstract

This paper presents the results of a detailed analysis of fractured clasts hosted within Miocene and Pleistocene paraconglomerates that are exposed close to a map-scale overthrust. Both these paraconglomerates bear numerous fractured clasts (22-50%). The architecture of fractures (joints and minor faults) is well-organized and independent of both clast orientation and the degree of clast roundness. The fractures were formed in situ, most probably due to neotectonic activity of the map-scale overthrust. The number of fractured clasts is positively correlated with the clast size, and negatively correlated with the grain-size of clasts of detrital rocks. The number of fractured clasts increases in clasts of detrital rocks, compared to those of quartzites and magmatic rocks.