| 词汇 | ultramafic |
| 语种 | 英语、汉语、英汉翻译、汉英翻译 |
| 释义 | BETA Examples of ultramaficultramafic isn’t in the Cambridge Dictionary yet. You can help! Previous studies seem to have overemphasized the point that ultramafic complexes in the region are aligned along regional shear zones. However, due to the complex magmatic history of these centres and the cur rent erosion levels, typically only fragments of the ultramafic lithologies are exposed. It is obvious that the compositions of mafic- ultramafic complexes like these have been greatly influenced by cumulate processes. In the southeast, the partially crystallized cumulates of the gabbro series were intruded by a lenticular, ultramafic pluton 800 m in thickness. The contacts between the ultramafic units are of two types: conformable and intrusive. Plagioclase from the ultramafic intrusion is distinctly more calcic than plagioclase of the layered gabbro. Cooling and contamination of mafic and ultramafic magmas during ascent through continental crust. Field relations within the ultramafic series indicate that it crystallized from at least three distinct injections of magma. |
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