3 years ago

An integrated U-Pb, Hf, and O isotopic provenance analysis of the Paleoproterozoic Murmac Bay Group, northern Saskatchewan, Canada

Sedimentary successions deposited near craton margins provide an opportunity to test hypotheses regarding nearest cratonic neighbors during deposition by reconstructing their sedimentary provenance. The Paleoproterozoic Murmac Bay Group, northern Saskatchewan, Canada, was deposited near the southwestern margin of the Rae craton between 1.93Ga and 2.32Ga. We present the first integrated detrital zircon U-Pb geochronology, Lu-Hf, and O isotope analysis of detrital zircon from these rocks with the aim to elucidate provenance and characterize crustal growth in the source regions. A foreland tectonic setting associated with the Taltson orogeny has been suggested for the upper Murmac Bay Group paleobasin, however its sediment source(s) remain uncertain. Our Hf data show that not all zircon U-Pb age populations can be attributed to local (Rae craton) sources. Integrating U-Pb, Lu-Hf, and O isotope data, we find that the most probable source rocks, in addition to Rae craton rocks, were from the Buffalo Head-Chinchaga domains in northern Alberta. Hafnium model ages calculated from the upper Murmac Bay Group identify two periods of regional crustal growth at 2.83Ga and 2.70Ga, agreeing with Sm-Nd model ages from the western Churchill province.

Publisher URL: www.sciencedirect.com/science

DOI: S0301926817301754

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.