Geochemistry of ∼1.9 Ga sedimentary rocks from northeastern Labrador, Canada

  • Hayashi K
  • Fujisawa H
  • Holland H
 et al. 
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Abstract

Fifty-eight rock chips from fifteen samples of sedimentary rocks from the Ramah Group (∼1.9 Ga) in northeastern Labrador, Canada, were analyzed for major and minor elements, including C and S, to elucidate weathering processes on the Earth's surface about 1.9 Ga ago. The samples come from the Rowsell Harbour, Reddick Bight, and Nullataktok Formations. Two rock series, graywacke-gray shales of the Rowsell Harbour, Reddick Bight and Nullataktok Formations, and black shales of the Nullataktok Formation, are distinguishable on the basis of lithology, mineralogy, and major and trace element chemistry. The black shales show lower concentrations than the graywackes-gray shales in TiO2(0.3-0.7 wt% vs. 0.7-1.8 wt%), Al2O3(9.5-20.1 wt% vs. 13.0-25.0 wt%), and ΣFe (

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Authors

  • Ken Ichiro Hayashi

  • Hiroyuki Fujisawa

  • Heinrich D. Holland

  • Hiroshi Ohmoto

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