岩浆岩的一类。二氧化硅含量为45%~53%，铁、镁质含量高，基本不含石英。主要有辉石和基性斜长石组成。代表岩石是辉长岩，因辉石呈黑色，斜长石呈白色，故常呈黑白斑杂岩石，粗晶状或似斑状结构，密度较大。
n. basite
misc. basic rock
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中基性岩多以喷溢相开始、火山沉积相结束；
Andesiticbasaltic eruption cycles usually begin with effusive facies and end with volcanogenitic sedimentary facies.
超基性岩与塞巴奎沉积岩岩片相间构成一巨大的构造岩片的杂岩体。
The ultrabasic rocks form a complex of large tectonic slices with intercalated slices of Sebakwian sedimentary rocks.
该铂- 金砂矿产于超基性岩体山前谷地的第四纪冲积- 洪积层中。
The studied platinum - gold placer occurs in Quaternary alluvial - diluvial a piedmont valley of ultrabasic rocks, Northwest China.
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