- Tytuł:
- Neoproterozoic ophiolite exotic blocks in the Outer Western Carpathians, southern Poland : a record of the fast ocean-floor cooling and alterations
- Autorzy:
-
Gawęda, Aleksandra
Szopa, Krzysztof
Waśkowska, Anna
Golonka, Jan
Krzykawski, Tomasz
Kalinichenko, Tatiana - Powiązania:
- https://bibliotekanauki.pl/articles/27323309.pdf
- Data publikacji:
- 2023
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
Outer Carpathians
Neoproterozoic
ophiolite mélange
ocean floor - Opis:
- Ophiolitic blocks, represented by metagabbro and serpentinite containing relict pyroxene, olivine, baddeleyite, zirconolite, Ni-pyrite and pyrrhotite, were found as exotic blocks in an olistostrome in the Magura Nappe, Outer Western Carpathians. The geochemical and isotopic features of the blocks suggest they represent mantle-derived rocks, with within-plate geochemistry signatures, modified by subduction, with lithospheric mantle input. A U-Pb apatite cooling age (614 ±3 Ma) is within age uncertainty of a published U-Pb zircon magmatic crystallization age (~614 Ma) implying rapid post-crystallization cooling. Pervasive alteration with replacement of primary minerals by low-temperature assemblages is observed in all rock fragments and is interpreted as contemporaneous with shearing. The secondary mineral assemblages and temperature modelling allow the interpretation that the pervasive ocean-floor metamorphism is the alteration in these meta-mafic rocks. These ophiolitic fragments can be linked to the Neoproterozoic break up of Rodinia/Pannotia.
- Źródło:
-
Geological Quarterly; 2023, 67, 1; art. no. 9
1641-7291 - Pojawia się w:
- Geological Quarterly
- Dostawca treści:
- Biblioteka Nauki
Artykuł