上地幔由超镁铁质的二辉橄榄岩组成，在尖晶石二辉橄榄岩和石榴石二辉橄榄岩之间有一过渡层。
The upper mantle consists of lherzolite, and it seems that there is a transition zone between spinel and garnet lherzolites.
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.
应用推荐