Geochemical comparison between Archaean and Proterozoic orthogneisses from the Nagssugtoqidian orogen , West Greenland

@inproceedings{Kalsbeek2001GeochemicalCB,
  title={Geochemical comparison between Archaean and Proterozoic orthogneisses from the Nagssugtoqidian orogen , West Greenland},
  author={Feiko Kalsbeek},
  year={2001}
}
In the Palaeoproterozoic Nagssugtoqidian orogen of West Greenland reworked Archaean and juvenile Proterozoic orthogneisses occur side by side and are difficult to differentiate in the field. Archaean gneisses have tonalitic to trondhjemitic compositions with relatively low Al2O3 and Sr, and may have been derived from magmas formed by melting of basaltic or amphibolitic rocks at moderate pressures. The Proterozoic rocks are on average more mafic, and it is likely that they crystallised from… CONTINUE READING
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