- Tytuł:
- Detrital zircon populations in Ediacaran Period sediments distinguish active from passive continent margins even when metamorphosed and help resolve the Gondwana-Panotia supercontinent/megacontinent argument
- Autorzy:
-
Crow, Michael
Zaw, Khin
Thu, Kyaw
Belousov, Ivan
Goemann, Karsten - Powiązania:
- https://bibliotekanauki.pl/articles/24202136.pdf
- Data publikacji:
- 2023
- Wydawca:
- Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
- Opis:
- Great thicknesses of sand and greywacke were deposited on the margins of megacontinents during the Ediacaran Period (620–542 Ma). Zircon age populations in sediments with long deep-time flat profiles distinguish passive margin sedimentation from shorter humped zircon profiles characteristic of sediments derived from volcanic arcs and their feeder zones in active margins. An example of a single hump detrital profile is given by an Ediacaran Period volcano present in the Charnian Supergroup in the Anglo-Brabant Massif of the East Avalonia terrane. This Gondwana fragment was originally part of the West Africa craton and was subsequently accreted to Laurentia. A volcanic complex with sediments carrying an Ediacaran biota is overlain by Triassic sediments. The main phase of eruption at c. 561 Ma provides a single hump zircon age histogram with a few pre-eruption zircon xenocrysts up to 40 Ma older
- Źródło:
-
Geotourism / Geoturystyka; 2023, 1-2 (72-73); 16--17
1731-0830 - Pojawia się w:
- Geotourism / Geoturystyka
- Dostawca treści:
- Biblioteka Nauki
Artykuł