Special Xenoliths in an Aegirine-Augite Syenite Porphyry in Liuhe, Yunnan, China: Discovery and Implications |
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作者单位: | LIU Xianfan(Chengdu University of Technology, Sichuan 610059, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Hubei 430074, China);SONG Xiangfeng(Chengdu University of Technology, Sichuan 610059, China;No. 402 Geological Party, Sichuan Bureau of Geology and Mineral Exploration and Development, Sichuan 611730, China);LU Qiuxia,TAO Zhuan,LONG Xunrong,ZHAO Fufeng(Chengdu University of Technology, Sichuan 610059, China)
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基金项目: | 国家自然科学基金,Foundation of Open Subjects of the State Key Laboratory of Geological Processes and Mineral Resources of the China University of Geosciences,the State Key(Preparation Support) Disciplines of Mineralogy |
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摘 要: | Three special types of xenoliths have recently been found in an aegirine-augite syenite porphyry in Liuhe,Yunnan,China.Petrographical,petrochemical,electron microprobe,and scanning electron microscopy studies indicate that pure calcite xenocrysts and quartz-bearing topaz pegmatite xenoliths result from the degassing of mantle fluids during their migration,and that black microcrystalline iron-rich silicate-melt xenoliths are the product of the extraction of mantle fluids accompanying degassing and are com...
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关 键 词: | 正长斑岩 柳河 辉石 云南 扫描电子显微镜 硅酸盐矿物 地幔流体 地球化学背景 |
Special Xenoliths in an Aegirine-Augite Syenite Porphyry in Liuhe,Yunnan,China:Discovery and Implications |
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Authors: | LIU Xianfan SONG Xiangfeng LU Qiuxia TAO Zhuan LONG Xunrong ZHAO Fufeng Chengdu University of Technology Sichuan China State Key Laboratory of Geological Processes Mineral Resources China University of Geosciences Hubei China No Geological Party Sichuan Bureau of Geology Mineral Exploration Development Sichuan China |
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Institution: | [1]Chengdu University of Technology, Sichuan 610059, China [2]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences Hubei 430074, China [3]3. No. 402 Geological Party, Sichuan Bureau of Geology and Mineral Exploration and Development, Sichuan 611730, China |
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Abstract: | Three special types of xenoliths have recently been found in an aegirine-augite syenite porphyry in Liuhe, Yunnan, China. Petrographical, petrochemical, electron microprobe, and scanning electron microscopy studies indicate that pure calcite xenocrysts and quartz-bearing topaz pegmatite xenoliths result from the degassing of mantle fluids during their migration, and that black microcrystalline iron-rich silicate-melt xenoliths are the product of the extraction of mantle fluids accompanying degassing and are composed dominantly of quartz, chlorite, and iron-rich columnar and sheet silicate minerals with characteristic minerals, such as native iron, apatite, and zircon. According to the bulk-rock chemical and mineral compositions and crystallization states, the microcrystalline melt xenoliths are not the product of conventional magmatism, and especially the existence of native iron further proves that the xenoliths were mantle fluid materials under reduction or anoxic conditions. The study of the special xenoliths furnishes an important deep-process geochemical background of polymetalUc mineralization in different rocks and strata in the study area. |
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Keywords: | special xenolith native iron mantle fluid degasification deep-process geochemistry |
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