Re os isotopic dating of molybdenites

These data are interpreted to indicate that the time of pegmatite crystallization occurred at 395 Ma with the younger U-Pb tantalite ages (i.e., youngest ~ 365 Ma), the 353 Ma Re-Os molybdenite age, and the oldest Ar age (i.e., 347 Ma) recording hydrothermal activity related to later magmatic events in this part of the Meguma terrane (e.g., 357 Ma Wedgeport Pluton). Geochemistry of Alkalis and Alkaline Earths in Ore-Forming Granites, Pegmatites, and Rhyolites.

The muscovite ages record resetting and cooling related to the ca.

Kontak Nova Scotia Department of Natural Resources, P. Heaman Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3Douglas A.

Creaser Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3Larry M.

Current interests include further development of the Re-Os chronometer to sedimentary and petroleum systems, time scale calibration and resolving controversy of the causes of mass extinctions.

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The studied zircons have a typical homogeneous character with oscillatory zoning and scarce restite cores.

SHRIMP U-Pb data provide an age of 81.5 ± 0.7 Ma, whereas restite cores suggest a latest Neoproterozoic-Ediacaran age (~565 Ma) source.

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