A number of New England “granites” and their associated pegmatites were analyzed spectrographically for their minor element content. The analyses were made of the rocks as a whole and of the rock-forming minerals separately.

  1. Each granite had well-marked minor element characteristics whereby it could, be distinguished from the others.

  2. Almost invariably the granites and the granite minerals had a greater variety of minor elements than the adjacent pegmatites and pegmatite minerals; when the same element was found in both environments it was more abundant in the granites.

  3. The following pairs of elements varied together: barium and strontium, and vanadium and chromium. The barium-strontium relationship was true in all mineral and rock samples; that of vanadium-chromium was marked only in the granites.

  4. Biotite, where present in a granite, contained the bulk of the minor elements of the rock.

  5. A genetic as well as an areal kinship between many of the granites and pegmatites was suggested.

  6. Most elements were preferentially concentrated in the biotites of a two-mica granite, only barium, scandium, sodium, and strontium being concentrated in the muscovites.

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