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cap rock |
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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A petrological examination of four rock samples collected during 2002 from the Exploration Licence 50 kilometres north of the WMC/ Falcon ground , has identified them as being possible silicified and ferruginised ultrabasic cap rocks which may have been serpentinised ultrabasic rocks. Overlying this ancient shoreline are cap rocks (impermeable layers) of the Mississippian Lower Shunda formation and Cretaceous/Jurassic impermeable shales. Chalcocite has also been found in altered volcanic cap rocks covering the mineralized intrusive bodies on the west side of the main zone. |
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