Abstract

Studies of accessory minerals separated from granitic rocks from the Mount Wheeler mine area, Nevada, and from the Yosemite Valley area, California, show that the calcium content of the rock has an important influence on the species of heavy accessory minerals developed. Typical calcium-rich and calcium-poor assemblages from the Mount Wheeler mine area are:

Assemblages are similar in rocks from Yosemite Valley, but garnet is rare.

These studies also suggest that zircon is more abundant in calcium-rich than in calcium-poor granitic rocks.

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