| 词汇 | mafic |
| 释义 | mafic adjective[ not gradable ] us/ˈmæf·ɪk/ earth science describes rocks containing more dark-colored substances and iron than other rocks Examples of maficmafic During this stage, the mafic minerals grow faster than plagioclase, exhausting the local melt in mafic components. Small amounts of mafic and opaque minerals occur. On the basis of our combined data, a more appealing model for the mafic-ultramafic complexes is the emplacement of solitary intrusions. This is in agreement with return to more mafic detritus and the proposed increased upper continental crust contribution, together at the expense of felsic detritus. In continental rift settings, the emplacement of such large volumes of felsic melts requires a huge amount of mafic magma derived from uprising asthenosphere. In particular, the heat for the melting may have been supplied by mafic mantle-derived magmas. In weakly deformed gneiss, the mafic minerals (biotite, augite and hornblende) occur as irregular clusters, locally separated from plagioclase by coronas of garnet. The mafic magmas were probably derived from the upper mantle (spinel stability field) by 9 % partial melting. Sampling was limited to the chromitite layers and laminae that occur in the mafic-ultramafic cumulates of these complexes. The thrust truncates a number of vertical mafic layers in the footwall block. It is obvious that the compositions of mafic- ultramafic complexes like these have been greatly influenced by cumulate processes. In general, eclogites are predominantly mafic and are preserved as boudins within felsic gneisses. The formation is vertically zoned with the appearance of banded and mafic pumices approximately 8 cm above the base of the ignimbrite. The mafic shells do not show up clearly due to weathering. Amphiboles from the core, the inner and outer mafic shells and the matrix were analysed. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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