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| 41. | When silica content reaches 45-53 %, basic rocks become the name of this type of igneous rock in which |
| 当岩石中SiO2含量在45～53％之间时，称这类火成岩为基性岩．辉长岩就是这类岩石侵入岩的典型代表，其中矿物成分为辉石、钙长石，而基性的喷出岩则称之为玄武岩。 |
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| 42. | Furthermore, the lunar orbiters confirmed that the highlands of the moon are dominated by anorthosite, an igneous |
| 此外，两艘月球轨道船证实了月球高地主要由斜长岩（一种主要由长石形成的火成岩，富含钙和铝）构成。 |
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| 43. | The results of well-to-seismic calibration are effective by selecting Permian igneous rock and Carboniferous |
| 利用上述方法，以哈得四油田二叠系火成岩及石炭系双峰灰岩为参考层，选取与研究区地震数据吻合性最好的子波，合理地调整声波速度，对哈得四油田的主要储层东河砂岩进行井－震标定，获得了较为理想的效果。 |
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| 44. | dark brown to black mica found in igneous and metamorphic rock. |
| 深棕色到黑色的云母，发现于火成岩与变质岩中。 |
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