syenite-porphyry
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Between east and west, the mineralization in subalkalic intrusive complex is different. In the west, the veins are chiefly quartz veins, quartz veinlets and network veins, the wall rocks are mainly syenite and quartz monzonite. In the east, the fine quartz network veins, altered kata-rocks, alkali-syenite and syenite are dominant.
成矿作用在偏碱性侵入杂岩体的东部与西部有所不同,西部多以石英脉、石英细脉、网脉型为主,围岩以正长岩、石英二长岩为主;东部则多为石英细网脉和破碎蚀变岩型,围岩主要是碱长正长岩、正长岩。
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The Pb isotopic compositions of the ores are similar to those of the syenite, as shown in the 207Pb/206Pb-208Pb/206Pb diagram, the ores, syenite, and Archean metamorphic rocks are linearly correlated and the ores are more closely related to the syenite than Archean metamorphic rocks do.
矿石铅同位素组成与正长岩杂岩体相似,在207Pb/206Pb-208Pb/206Pb图解上,矿石、正长岩、矿石中的钾长石脉石及太古宇桑干群变质岩呈线性分布,矿石与正长岩在铅同位素组成上更接近,而与太古宙变质岩有明显的区别。
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The early magmatic rocks include quartz syenite porphyries , syenite porphyries , striking in near SN direction; the latter ones include biotite syenite porphyries , lamprophyres, striking in near EW direction.
详细讨论了北衙矿区的地质特征,通过对勘探资料的深入研究和野外观察,初步确定,北衙矿区存在两期岩浆活动,早期的石英正长斑岩、正长斑岩等近南北向分布,晚期的黑云正长斑岩、煌斑岩脉等呈近东西向展布。
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diorite syenite-porphyry:闪长正长斑岩
闪长斑岩 diorite porphyry | 闪长正长斑岩 diorite syenite-porphyry | 闪长煌斑岩 dioritic lamprophyre