Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Thomas E. Krogh"'
Publikováno v:
Geochimica et Cosmochimica Acta. 60:3505-3511
Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a new, minimum UPb age obtain
Publikováno v:
Canadian Journal of Earth Sciences. 32:273-280
U–Pb baddeleyite and zircon ages for three diabase dykes from widely spaced localities within the Grenville dyke swarm indicate a single age of emplacement at [Formula: see text] Ma. The 700 km long Grenville dyke swarm, located in the southeastern
Publikováno v:
Canadian Journal of Earth Sciences. 30:1607-1612
Mafic sills from Cape St. Mary's on the Avalon Peninsula of Newfoundland give an U–Pb baddeleyite age of 441 ± 2 Ma. This age corresponds with the earliest ages recorded for the climactic Silurian orogenic event that dominantly affected rocks of t
Publikováno v:
Canadian Journal of Earth Sciences. 30:1490-1504
An Early Proterozoic Kikkertavak mafic dyke intruding the Archaean Hopedale block, Labrador, gives an age of 2235 ± 2 Ma using U–Pb techniques on baddeleyite. A Harp mafic dyke in the same area gives an age of 1273 ± 1 Ma using U–Pb techniques
Publikováno v:
Geology. 17:602
Mafic dike swarms represent direct evidence of early tensional environments that may have eventually led to ocean formation. The first precise U-Pb zircon and baddeleyite age of 615 {plus minus} 2 Ma for a Long Range dike, southeastern Labrador, coul