Cyrkony nie są wieczne. Badania izotopowe O-U-Pb cyrkonów ze skał alkalicznych

• Autorzy: Krzemińska Ewa , Poprawa Paweł

Identyfikatory

DOI

10.7306/2024.56

Warianty tytułu

EN

Zircons are not forever. O-U-Pb isotopic studies of the zircons from alkaline rocks

• Języki publikacji: PL

Abstrakty

EN

Despite the common belief that zircons are nearly indestructible i.e. zircons last forever, regardless of the geological evolution experienced by their host rocks, there is one hostile environment in which decomposition of this incredibly resistant mineral may occur. An alteration of the natural zircon by coupled dissolution-reprecipitation or by ion-exchange with an aqueous fluid are common for alkaline rocks. In those zircons, the abundance of non-formula elements increase and textural changes are frequently observed. These symptoms are accompanied by the disturbance of primarily isotopic signatures. The extent of these processes can be well inferred from the oxygen (δ¹⁸O) isotopic composition of zircon. A large contrast of the δ¹⁸O between values of the normal mantle/magmatic zircons (>5.3 ±0.6%o) and the results obtained from the porous zircons from the Elk syenite massif have been detected by SHRIMP IIe/MC analyses using a~20 fim Cs+ beam. Most of the grains had reduced δ 1SO, up to prominently negative δ¹⁸O values of-7.46 ±0.27%. These δ 18O-depleted signatures resulted from high-temperature alkaline fluids - zircon interaction after foid syenite emplacement. Then this would imply that porous textures, as illustrated in Fig. 1, could be induced by alkaline fluids and thus these grains could be used to date solely the post-emplacement, i.e. hydrothermal, stage of evolution.

Słowa kluczowe

PL

zmiana wywołana płynem; cyrkon pierwiastki nieformalne; U-Pb cyrkon geochronologia; δ18 O w cyrkonie; intruzja alkaliczna

EN

fluid-induced alteration; zircon non-formula elements; U-Pb zircon geochronology; δ18 O in zircon; alkaline intrusion

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2024
• Tom: Vol. 72, nr 12-1
• Strony: 730--–734
• Opis fizyczny: Bibliogr. 35 poz., fot.

Twórcy

autor

Krzemińska Ewa

• Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy, ul. Rakowiecka 4, 00-975 Warszawa

• https://orcid.org/0000-0002-6832-8104

autor

Poprawa Paweł

• AGH Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie, Wydział Geologii, Geofizyki i Ochrony Środowiska, al. A. Mickiewicza 30, 30-059 Kraków

• https://orcid.org/0000-0002-9026-2252

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).