Abstract
Because of marked differences between trace ferride content of ore magnetite and that of disseminated wall-rock magnetite, James and Dennen concluded (ibid., v. 57, p. 439-499, 1962) that the ore was not concentrated by lateral secretion, and instead had a magmatic source. This conclusion is not valid if the ferromagnesian silicates of the host rock were an important source of the iron. In this latter case, the differences between ore and host-rock magnetite and observed regional differences in ferride content can be attributed to differences in host-rock composition or to degree of recrystallization.
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