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carbonaceous rock

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carbonaceous rock [kär·bə′nā·shəs ′räk]
(petrology)
Rock with carbonaceous material included.


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5) 2-3 cm darker brownish and slightly carbonaceous rock, with abundant brachiopod shells and fragments in the upper part.
Usually the content of crystalline rocks in the gravel-pebble fraction of glaciofluvial deposits is 10-15% higher than in tills, whereas the content of carbonaceous rocks in them is correspondingly lower (Raukas 1978).
Gold mineralization in drillholes is associated with heavy quartz-carbonate plus sulphide alteration on carbonaceous rocks and igneous breccias of unknown origin.
 
 
 
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