4 CONTENTS. 



CHAP. PAGE - 



10. Origin of the Coarsely Crystalline Basic Patches and Meta- 



morphic Diffusion 70 



11. Further Examples of Metamorphic Diffusion 72 



Junction Specimens 72 



Composite Gneiss 73 



12. Further Examples of Metamorphic Differentiation 76 



Hornblende, Sphene, Magnetite, Felspar 76 



13. Review and Discussion of Field Phenomena 79 



IV. The Granodiorite Gneiss of Cape Denison 84 



The Aplite Gneisses of Cape Denison 89 



Interpretations of Certain Variations in the Granodiorite Gneiss 91 



V. Correlation with similar Rocks of other Areas and the application of 

 the Conceptions of Metamorphic Differentiation and Metamorphic 



Diffusion 93 



1. General 93 



2. North- West Highlands of Scotland 94 



3. Haliburton and Bancroft Areas, Canada 98 



4. Highlands of New Jersey 103 



The Assimilation Theory 105 



5. The Lizard, Cornwall 106 



Summary 117 



6. Chemical Composition as a Criterion in Determining the 



Origin of Metamorphic Rocks 118 



7. Conclusion 121 



VI. The Mackellar Islets 122 



VII. Cape Hunter 124 



VIII. The Madigan Nunatak .' 128 



Plagioclase Pyroxene Gneiss 128 



Hypersthene Alkali Felspar Gneiss 133 



IX. Aurora Peak 138 



Hornblende Plagioclase Pyroxene Gneiss 138 



Hypersthene Alkali Felspar Gneiss 139 



