extrusive rock


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Related to extrusive rock: Intrusive Rock

extrusive rock

[ik′strü·siv ′räk]
(geology)
References in periodicals archive ?
It is worth mentioning that, according to the geophysical data, extrusive rocks forming the Deecan Plateau of India (famous for zeolites and associated minerals) are related to another hotspot active in the same region (but genetically younger at ~67 million years)--the Reunion Hotspot.
Geologically, the project area is a 15 million year old volcanic eruptive center dominated by a bi-modal suite of flow domes, dikes, and extrusive rocks that were intensively and extensively altered and mineralized by a hydrothermal system of the same age.
The oldest extrusive rocks are capped by a Quaternary basalt flow several hundred feet thick.
The property covers a sequence of intrusive and extrusive rocks that are host to a number of known occurrences of nickel, copper, PGM's and gold.
There was abundant disseminated and stringer sulfphid mineralizatiuon in the extrusive rocks and associated quartz veining.