Szczegóły publikacji
Opis bibliograficzny
Detrital zircon U-Pb geochronology of a metasomatic calc-silicate in the Tsäkkok Lens, Scandinavian Caledonides / Christopher J. BARNES, Jarosław MAJKA, Michał BUKAŁA, Erika Nääs, Sabine Rousku // Geology, Geophysics & Environment / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie ; ISSN 2299-8004. — Tytuł poprz.: Geologia : kwartalnik Akademii Górniczo-Hutniczej im. Stanisława Staszica w Krakowie ; ISSN: 0138-0974. — 2021 — vol. 47 iss. 1, s. 21-31. — Bibliogr. s. 29-31, Abstr. — Publikacja dostępna online od: 2021-04-23. — Ch. J. Barnes - dod. afiliacja: Polish Academy of Sciences ; J. Majka – dod. afiliacja: Uppsala University, Sweden
Autorzy (5)
- AGHBarnes Christopher
- AGHMajka Jarosław
- AGHBukała Michał
- Nääs Erika
- Rousku Sabine
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 135568 |
|---|---|
| Data dodania do BaDAP | 2021-09-08 |
| Tekst źródłowy | URL |
| DOI | 10.7494/geol.2021.47.1.21 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Geology, Geophysics & Environment |
Abstract
The Tsakkok Lens of the Seve Nappe Complex in the Scandinavian Caledonides comprises eclogiie bodies hosted within metasedimentary rocks. These rocks are thought to be derived from the outermost margin of Baltica along the periphery of the Iapetus Ocean, but detrital records from the sedimentary rocks are lacking. Many metasedimentary outcrops within the lens expose both well-foliated metapelitic rocks and massive talc-silicates. The contacts between these two lithologies are irregular and are observed to trend at all angles to the high-pressure foliation in the metapelites. Where folding is present in the metapelites, the talc-silicate rocks are also locally folded. These relationships suggest metasomatism of the metapelites during the Caledonian orogenesis. Zircon U-Pb geochronology was conducted on sixty-one zircon grains from a talc-silicate sample to investigate if they recorded the metasomatic event and to assess the detrital zircon populations. Zircon grains predominantly show oscillatory zoning, sometimes with thin, homogeneous rims that have embayed contacts with the oscillatory-zoned cores. The zircon cores yielded prominent early Stenian, Calymmian, and Statherian populations with a subordinate number of Tonian grains. The zircon rims exhibit dissolution-reprecipitation of the cores or new growth and provide ages that span similar time frames, indicating overprinting of successive tectonic events. Altogether, the zircon record of the talc-silicate suggests that the Tsakkok Lens may be correlated to Neoproterozoic basins that are preserved in allochthonous positions within the northern extents of the Caledonian Orogen.
