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研究了华北十一个典型太古代花岗岩体的副矿物，结果表明，太古代花岗岩类副矿物种类简单，含量高，组合稳定单一，几乎都是Mt Ap Zir(Sph)型，这一规律可作为太古宙与显生宙花岗岩类岩石判别的标志。太古宙花岗岩类岩石可能是由早期地壳中的镁铁质和长英质岩石经熔融，混合而成的。 相似文献
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由本会宝石矿物学委员会主办的全国宝石学研究及应用进展研讨会于1988年6月13—16日在西安举行。来自地质矿产部、外贸部、化工部、能源部、冶金部、中国科学院、中国有色工业总公司等77个单位的近百名代表参加了会议。大会就宝石的国内外研究进展、着色处理、合成、资源等专题进行了研讨,旨在及时交流宝石学研究及其应用的信息,讨论并预测国内宝石学发展趋势,进一步推动和繁荣我国宝石学科研、生产、教学及贸易。 相似文献
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Detailed geological，chronological,mineralogical,petrological and geochemical studies have been conducted of the Chichent gneissic complex in northwestern Hebei province.The gneissic complex is composed mainly of tonalitic-granodioritic rocks according to O'Connor's classification.The zircou U-Pb age of the gneissic complex is 2468-27^+33 Ma.,consistent with that of the rocks in the North Tonalitic-granodioritic Gneiss Belt in the North China Platorm.The Archean Chicheng gneissic complex is part of the belt.No significant difference in composition between early anhedral metasomatic and late semi-euhedral plagiocalases suggests that the gneissic complex is not composed merely of mafic rocks replaced by felsic fiuids.The REE patterns in the complex,in conjunction with major and trace elements data,show that the gneissic complex is the mixture of felsic magma produced by partial melting of FI dacitic granulite and crystallate derived from the magma produced by 50%±partial melting of TH2 tholeiitic granulite and 40%±fractional crystallization of hornblende. 相似文献
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