- Tytuł:
- Age constraints on the Pre-Variscan and Variscan thermal events in the Kamieniec Ząbkowicki Metamorphic belt (the Fore-Sudetic Block, SW Poland)
- Autorzy:
-
Jastrzębski, Mirosław
Żelaźniewicz, Andrzej
Budzyń, Bartosz
Sláma, Jiří
Konečny, Patrik - Powiązania:
- https://bibliotekanauki.pl/articles/1836361.pdf
- Data publikacji:
- 2020
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Tematy:
-
U-Pb geochronology
LA-ICP-MS dating
U-Th-total Pb geochronology
EPMA dating
microplates of the Bohemian Massif
Kamieniec Ząbkowicki Metamorphic Belt
Variscan metamorphism - Opis:
- The Kamieniec Ząbkowicki Metamorphic Belt (KZMB) is a narrow zone of mainly mica schists, subordinate acid metavolcanics and scarce eclogites, sandwiched between Brunovistulia and the northern tip of the Teplá-Barrandia microplates. Locally occurring high-pressure relics indicate subduction of the metasedimentary succession of the KZMB, the origin and provenance of which remain unclear. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) investigations of detrital zircons show that the metapelites represent an Ediacaran-Cambrian sedimentary basin, with a maximum depositional age of 561±9 Ma. This basin was filled with detritus from a source or sources, composed of rocks containing zircons that are mainly Cryogenian-Ediacaran and Palaeoproterozoic in age. No younger component was found in the zircon population studied. The isotopic U-Pb LA-ICP-MS and chemical U-Th-total Pb electron probe microanalysis (EPMA) monazite geochronology data indicate an important regional tectono-metamorphic event at ca. 330 Ma. Though these data do not permit determination of the peak pressure from the peak temperature stages, the event was part of a complex collision of the Saxothuringian plate with Brunovistulia.
- Źródło:
-
Annales Societatis Geologorum Poloniae; 2020, 90, 1; 27-49
0208-9068 - Pojawia się w:
- Annales Societatis Geologorum Poloniae
- Dostawca treści:
- Biblioteka Nauki
Artykuł