Author:
Baadsgaard H.,Morton R. D.,Olade M. A. D.
Abstract
Spilitic basalts from the Proterozoic Seton Formation at the type locality of Seton Island in the East Arm of Great Slave Lake, Northwest Territories, have a Rb–Sr isotopic age of 1872 ± 10 m.y. The age, representing either the time of eruption or a subsequent metasomatic (spilitization) event, provides a minimum age for the Great Slave Supergroup of the district. An initial 87Sr/86Sr ratio of 0.7018 ± 0.0005 for the lavas is, together with their age, in accordance with previously proposed theories on continental separation and mantle derived magmatism during Aphebian times.
Publisher
Canadian Science Publishing
Subject
General Earth and Planetary Sciences
Cited by
19 articles.
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1. Organic remains in late Palaeoproterozoic granular iron formations and implications for the origin of granules;Precambrian Research;2018-06
2. U–Pb zircon ages from Athapuscow aulacogen, East Arm of Great Slave Lake, N.W.T., Canada;Canadian Journal of Earth Sciences;1984-11-01
3. Lower Proterozoic red beds, evaporites and secondary sedimentary uranium deposits from the East Arm, Great Slave Lake, Canada;Journal of the Geological Society;1984-03
4. Paleomagnetism of the North American Precambrian: a look at the data base;Precambrian Research;1983-03
5. Rb–Sr isochron ages, magmatic 87Sr/86Sr initial ratios, and oxygen isotope geochemistry of the Proterozoic lava flows and intrusions of the East Arm of Great Slave Lake, Northwest Territories, Canada;Canadian Journal of Earth Sciences;1982-02-01