暗色岩是一种火成岩。
它们产于富含暗色岩和伟晶岩的古老地盾区内。
The deposits occur in the old shield which is rich in dark rocks and pegmatites.
同时，该层序内沉积的暗色泥岩也是有利的烃源岩。
The dark mudstone deposited in this time is the favorable source rock.
同时，该层序内沉积的暗色泥岩也是有利的烃源岩。
The dark mudstone deposited in this time is the favorable source rock.
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