cap rock

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Related to cap rocks: source rocks

cap rock

[′kap ‚räk]
(geology)
An overlying, generally impervious layer or stratum of rock that overlies an oil- or gas-bearing rock.
Barren vein matter, or a pinch in a vein, supposed to overlie ore.
A hard layer of rock, usually sandstone, a short distance above a coal seam.
An impervious body of anhydrite and gypsum in a salt dome.
References in periodicals archive ?
The project includes the involvement of undergraduate engineering honors students in independent research on geologic sequestration focused on the sealing capacity of cap rocks serving as barriers to carbon dioxide migration in geologic formations; development of an advanced undergraduate/graduate level course on coal combustion and gasification, climate change, and carbon sequestration; support of six graduate students conducting research on the development of protocols for assessment of seal layer integrity; and analysis of cap rock samples from geologic formations under consideration for sequestration of CO2.
The initial drill program will focus on the core area of the porphyry where the leached cap rocks are associated with anomalous copper geochemistry, high conductivity and low resistivity.
There is also excellent potential for outlining heap - leachable gold deposits in the oxidized cap rocks.