Thermal maturation of the Lower Palaeozoic strata in the southwestern margin of the Malopolska Massif,southern Poland: no evidence for Caledonian regional metamorphism |
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| Authors: | Z Belka A Siewniak-Madej |
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| Institution: | 1. Geologisch-Pal?ontologisches Institut der Universit?t, Sigwartstr. 10, D-72076, Tübingen, Germany
2. State Geological Institute, Silesian Branch, Krolowej Jadwigi 1, PL-41200, Sosnowiec, Poland
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| Abstract: | Conodont colour alteration index (CAI) values have been used for the assessment of the thermal history of Lower Palaeozoic
strata in the southwestern margin of the Malopolska Massif, along the contact with the Upper Silesian Massif. The CAI data
provide no evidence for a previously suggested greenschistgrade regional metamorphism in the Cracow-Myszkow zone during the
Caledonian epoch. Near Zarki, the Silurian rocks display a relatively uniform thermal overprint (CAI values of 4) resulting
from sedimentary burial during the early Late Carboniferous. The estimated maximum temperatures of 200–220°C can be explained
by an elevated heat flow associated with the Cracow Fault system. This thermal maturation level was locally enhanced (CAI
values up to 8) after the Westphalian, due to the magmatic activity caused by the Variscan regional extension. |
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| Keywords: | Thermal maturation Lower Palaeozoic Conodont colour alteration index Variscan intrusives Malopolska Massif Poland |
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