Szczegóły publikacji
Opis bibliograficzny
Late Ediacaran–early Cambrian rifting along the northern margin of Laurentia: constraints from the Yelverton Formation of Ellesmere Island, Canada / Karol Faehnrich, William C. McClelland, Laura Webb, Karolina KOŚMIŃSKA, Justin V. Strauss // Canadian Journal of Earth Sciences ; ISSN 0008-4077. — 2023 — vol. 60 no. 12, s. 1597–1626. — Bibliogr., Abstr. — Publikacja dostępna online od: 2023-10-03
Autorzy (5)
- Faehnrich Karol
- McClelland William C.
- Webb Laura E.
- AGHKośmińska Karolina
- Strauss Justin V.
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 151200 |
|---|---|
| Data dodania do BaDAP | 2024-01-18 |
| DOI | 10.1139/cjes-2023-0020 |
| Rok publikacji | 2023 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre |
Abstract
Neoproterozoic to early Paleozoic strata exposed along the northeastern margin of North America (Franklinian Basin) record a prolonged history of rifting and passive margin development. An episode of Ediacaran-Cambrian extension is potentially recorded in volcanic and sedimentary rocks of the Yelverton Formation, exposed on northern Ellesmere Island, Nunavut, Canada. Here, we present new whole-rock trace element and isotope geochemistry and hornblende 40Ar/39Ar geochronology from intrusive and extrusive rocks of the Yelverton Formation, along with isotope geochemistry from carbonate rocks underlying the volcanics and detrital zircon U-Pb and Lu-Hf isotopic data from the Yelverton Formation and overlying Grant Land Formation. The carbonate strata yielded an average 87Sr/86Sr value of 0.7076 (n = 6), constraining the overlying volcanics to the late Ediacaran-early Cambrian (ca. 570-530 Ma). Flows and dikes/sills show three distinct compositions: (1) a depleted, low La/YbPM and Th/Nb group, (2) an enriched, higher La/YbPM and low Th/Nb group, and (3) a low to moderate La/YbPM and high Th/Nb group. One of the high Th/Nb intrusions produced saddle-shaped 40Ar/39Ar hornblende spectra with ca. 482 ± 7Ma age minima and Silurian-Devonian inverse isochron ages, highlighting a hitherto unknown suite of younger intrusions and volcanic rocks. The trace element geochemistry and 143Nd/144Nd(t)ratios of enriched and depleted volcanic rocks of the indisputable Yelverton Formation are consistent with decompression melting during rifting along a continental margin. We suggest that late Ediacaran-early Cambrian rifting recorded in the Yelverton Formation resulted in the separation of peri-Laurentian terranes, such as the North Slope subterrane and eventual development of the passive margin of northern Laurentia.
