It is unfortunate that a theory of vein formation so in conflict with known facts of physical chemistry should be based on one small specimen, especially when the orientation of the specimen is not known, but must be assumed to be such as to accord with the theory. There is hardly a sentence in the interpretive part of the paper that is not open to question. In the following discussion no attempt is made to select all of the things that could be questioned; only those points are picked out that are answerable on general grounds, without reference to details of the specimen. Shaub makes an attempt at justification on the grounds that insufficient experimental work has been done to prove or disprove the operation of immiscible concentrated solution pairs. As a matter of fact, there is ample experimental evidence to indicate that such immiscible solutions do not exist at the temperatures under which such vein deposits form. The mineral assemblages give a reasonably accurate estimate of the temperatures of formation; at least, they indicate a temperature above which the solutions could not have been when crystallization began. Estimates range from 575° C. down.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.