| 长江上游地区几个层状基性-超基性侵入体的岩石特征及有关岩石学问题 |
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| 引用本文： | 刘若新,解广轰,倪集众.长江上游地区几个层状基性-超基性侵入体的岩石特征及有关岩石学问题[J].地球化学,1974(2):77-92. |
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| 作者姓名： | 刘若新 解广轰 倪集众 |
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| 摘 要： | Three iron-, titanium-rieh layered basie-ultrabasie intrusives have been described.They occur in an approximately south-north striking belt of tectonie-magmatic complex within an anteklise. Iron and titanium were concentrated in the lower or middle lower parts of these intrusives in the early and middle stages of differentiation, during which 《FeO》 may have played an important role. Intimate spatial and temporal association as well as common petroehemical features (i.e., high iron and titanium contents) have been found between these layered intrusives and the syenite and alkalisyenite plutons. All of these rocks are considered as hypogene produets of the differentiation of the. Omeishan basaltic magma. In other words, the hypogene differentiation of the iron (titanium)-rieh, sub-alkali Omeishan basaltic magma under the same tectonic-geological conditions resulted in the formation of the rock series of layered intrusives (peridotite→iron, titanium-rich ultramafic rocks→iron, titanium-rich gabbro, plagioclasite)→syenite, alkali-syenite.
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| 关 键 词： | 长江上游地区 基性岩 超基性岩 岩石特征 岩石学 |
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