黑云母一般是镁铁质及超镁铁质岩石中的次要成分。
Biotite is a subordinate constituent of the mafic and ultramafic rocks generally.
前人对该地区二叠纪镁铁质—超镁铁质岩石的研究程度较低。
The studying degree of the predecessor is low to the Permian mafic-ultramafic rock.
以窑沟橄榄辉石角闪石岩岩体为代表，研究了涞源岩基中超镁铁质岩石。
This paper chooses the Yaogou hornblendite body, one of the two major ultramafic outcrops in the Laiyuan batholith, as a representative to carry out detailed research.
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