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a. A group of igneous rocks within a petrographic province that are
related chemically and petrographically, generally in a systematic manner
such that chemical data for the rocks plot as smooth curves on variation
diagrams. See also: tribe AGI
b. The association of mineral deposits with certain rock types. If
mineral-producing localities are considered individually, valuable
generalizations often can be made, and lithotectonic-plate tectonic
classifications of ore deposits and exploration strategies derived from
them.
Source:
Dictionary of Mining, Mineral, and Related Terms
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