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Magmatic activity at the Silurian/Devonian boundary in the Brunovistulia and Małopolska Terranes (S Poland): possible link with the Rheic Ocean closure and the onset of the Rheno-Hercynian Basin

Published online by Cambridge University Press:  17 May 2019

Jerzy Nawrocki*
Affiliation:
Faculty of Earth Sciences and Spatial Management, Maria Curie-Skłodowska University, Al. Kraśnicka 2cd, 20-718Lublin, Poland
Magdalena Pańczyk
Affiliation:
Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975Warsaw, Poland
Piotr Szrek
Affiliation:
Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975Warsaw, Poland
*
Author for correspondence: Jerzy Nawrocki, Email: [email protected]

Abstract

The age of granophyric diorite from the Sosnowiec IG-1 borehole (Brunovistulia Terrane) was studied by means of U–Pb single-grain zircon analysis performed on a SHRIMP (sensitive high-resolution ion microprobe) IIe device. The isotope ages and provenance of zircons from the Emsian tuffs cropping out in the southern part of the Holy Cross Mountains (Małopolska Terrane) were also investigated using the same method. The age of the diorite intrusion (420 ± 2 Ma) is comparable with the combined Ar–Ar/magnetostratigraphic age of the Bardo diabase intrusion from the northern part of the Małopolska Terrane. These intrusions were emplaced during the same event of regional tectonic extension associated with the Rheic Ocean closure and the onset of processes creating the Rheno-Hecynian Basin near the Silurian/Devonian boundary. A negative Nb anomaly characteristic of both intrusions could be linked with the subduction of the Rheic oceanic crust under the SE margin of the Old Red Continent. Emsian magmatic activity in the distant Rheno-Hercynian Zone provided several tuff layers in the northern part of the Małopolska Terrane. As can be inferred from zircon ages, these tuffs were derived from mafic eruptions that cut sedimentary rocks containing detrital zircons transported from Baltica. This interpretation fits the existing models of development of the Rheno-Hercynian Basin in the Emsian.

Type
Original Article
Copyright
© Cambridge University Press 2019 

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