| 陕西金堆城花岗岩类主要造岩矿物特征及其岩石学意义 |
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| 引用本文： | 聂凤军.陕西金堆城花岗岩类主要造岩矿物特征及其岩石学意义[J].岩石矿物学杂志,1988,7(4):337-347. |
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| 作者姓名： | 聂凤军 |
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| 作者单位： | 中国地质科学院矿床地质研究所 |
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| 摘 要： | 本文依据大量测试数据,对金堆城地区花岗岩类主要造岩矿物学特征同钼迁移富集成矿关系进行了探讨。研究结果表明:异常晶胞条纹长石和正长石以及富重稀土和具明显负铕异常的黑云母是含钼花岗岩类标型矿物,并且可作为花岗岩类岩石发育地区寻找隐伏钼矿体的指示性矿物。钾钠长石和斜长石的结构状态和成分不仅可以提供有关花岗岩类成因演化的信息,其矿物本身亦可成为钼的载体矿物。岩浆期后,强烈的热液蚀变作用可造成钾钠长石和斜长石分解,并且引起钼的释放,从而形成高品位钼矿石。
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| 关 键 词： | 含钼花岗岩类 矿物标型 稀土元素地球化学 异常晶胞 陕西 |
Main Rock-forming Minerals of Jinduicheng Granitoids in Shanxi Province: Their Characteristics and Petrological Significance |
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| Nie Fengjun.Main Rock-forming Minerals of Jinduicheng Granitoids in Shanxi Province: Their Characteristics and Petrological Significance[J].Acta Petrologica Et Mineralogica,1988,7(4):337-347. |
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| Authors: | Nie Fengjun |
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| Abstract: | Jinduicheng granitoids and the it related porphyry Mo deposits lie within the Henan-Shanxi faulted-upwarping area along the southern edge of the Sino-Korean paraplatform. The Yenshanian granitoids (124 to 130 Ma) consist of Laoneushan biotite monzonitic granite batholith and Shijiawan-Jinduicheng granite porphyries.The Laoneushan granite body intruded into gneiss of Archean Taihua Group and meta-spilite of Proterozoic Xionger Group, with an exposed area of some 440 km~2. The Shijiawan granite porphyry intruded into meta-spilite of Xionger Group and metamorphic quartz sandstone as well as quartzite of Gashanhe Formation. The Jinduicheng granite porphyry intruded into meta-spilite of Xionger Group. Those granite porphyries are all less than 1 km~2 in size. Mineralogical studies show that not only can the structure state and composition of plagioclase and K-Na-feldspar provide the information on origin and evolution of granitoids, but these minerals themselves might act as Mo-carrier as well. Along with wide and strong hydrothermal alterations of post-granite porphyry period, Mo released from the Mo-carrier was superimposed on the original Mo stockworks, forming high-grade ores of granite type. In addition, the F-, HREE-rich biotite with distinct negative Eu anomaly can be taken as a useful indicator mineral for Mo ore prospecting in granitoid areas. |
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| Keywords: | Mo-bearing granitoid typomorphic peculiarity REE geochemistry anomalous unit cell Shanxi |
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