Classification of Igneous Rock Series

@article{Peacock1931ClassificationOI,
  title={Classification of Igneous Rock Series},
  author={Martin A. Peacock},
  journal={The Journal of Geology},
  year={1931},
  volume={39},
  pages={54 - 67}
}
  • M. A. Peacock
  • Published 1 January 1931
  • Geology
  • The Journal of Geology
Some rock series cannot be properly classified either as alkalic or as sub-alkalic. To meet this situation a simple extension of the present twofold classification is proposed; this takes the form of a fourfold division into alkalic, alkali-calcic, calc-alkalic, and calcic groups. It is shown, from a partial graphical representation of thirteen rock series, that the silica value at which the curves for total alkalis and for lime intersect (the alkali-lime index) is characteristic of a rock… 
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References

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PROF. DALY is a man of ideas. A few facts observed in the field suggest to him a hypothesis which he then proceeds to test by searching for other facts which must exist if the hypothesis be of any
On the Origin of the Alkaline Rocks
The writer believes that the process of albitization, now known to be a common accompanying feature of granitic intrusion, furnishes a key to the genesis of alkaline rocks. The passage of emanations