eruptive rock

eruptive rock

[ə′rəp·tiv ′räk]
(petrology)
Rock formed from a volcanic eruption.
Igneous rock that reaches the earth's surface in a molten condition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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These late Carboniferous to early Permian metallic deposits appear to be associated with basaltic to andesitic eruptive rocks. The presence of Cu-Mo porphyry deposits and secondary lead deposits in a region of arid weathering sets the stage for the formation of wulfenite deposits.
Knowledge of the earth's mantle is being generated through the study of eruptive rocks that have their sources in the 100 to 200 km depth range.
The country rock in the district consists of Cretaceous thinbedded limestones and shales that have been injected with felsic eruptive rocks, the largest mass of which is the granodiorite laccolith forming San Pedro Peak near the center of the property.