Titanium , aluminum and interlayer cation substitutions in biotite from high-grade gneisses ' West Greenland

  title={Titanium , aluminum and interlayer cation substitutions in biotite from high-grade gneisses ' West Greenland},
  author={Rosenr F. DYtvtBx},
  • Rosenr F. DYtvtBx
  • Published 2007
A detailed electron microprobe study has been carried out on biotite in pelitic to mafic metamorphic rocks from two localities in West Greenland. Comparison of analyses from similar rock types indicates higher Ti, K/(K+Na), and possibly (K+Na), similar AlIv, and lower AlvI in granulite us. amphibolite grade samples. Normalization of the analyses on the basis of7 octahedral and tetrahedral cations results in calculated total positive charge that exceeds the theoretical maximum of 22.0 in all… CONTINUE READING
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