Sedimentary Rocks and Crustal Evolution: Tectonic Setting and Secular Trends

@article{McLennan1991SedimentaryRA,
  title={Sedimentary Rocks and Crustal Evolution: Tectonic Setting and Secular Trends},
  author={S. McLennan and S. Taylor},
  journal={The Journal of Geology},
  year={1991},
  volume={99},
  pages={1 - 21}
}
A significant change in the composition of turbidites deposited at active tectonic settings is seen at the Archean/post-Archean transition. In comparison to post-Archean active margin turbidites, Archean greenstone turbidites exhibit more uniform Th/Sc ratios (but with a similar average), greater HREE-depletion ($$Gd_{N}/Yb_{N} >2$$), less Eu-depletion (Eu/Eu* mostly >0.85) and an absence of low Th/U ratios (Th/ U >3). These data indicate that differing mantle sources and/or conditions of… Expand
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