Primary banding in norite and gabbro

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Abstract
The remarkable regularity of banding in such complexes as the Stillwater, the Bushveld, and a number of other large mafic intrusions, has attracted attention of petrologists for the last two decades. Many hypotheses have been advanced to account for this banding; though no one hypothesis is completely in accord with all the facts concerning them, nearly every hypothesis has an element of truth in it. Coats [see 1 of “References” at end of paper] has ably reviewed the literature on the subject, has presented an hypothesis of his own to account for banding, and has backed that hypothesis with laboratory‐experiments. This work seems to the writer to be the most satisfactory that has appeared on this subject. It may be the correct explanation for the banding of certain gabbros, but it is not entirely adequate to explain the banding which the writer has studied in the Stillwater Complex. The writer independently came to the conclusion that differential settling of the crystalline constituents of the bands is a major factor in the explanation of their origin. In this he completely agrees with Coats. He diverges from Coats' views, however, as to the cause of rhythmic repetition of the bands. Only a brief analysis of the problem will be presented at this time. The subject will be treated more comprehensively at a later date.

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