| 湘南中生代火山岩中尖晶石二辉橄榄岩包体 Sm-Nd等时线年龄及地质意义 |
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| 引用本文： | 陈必河,贾宝华,刘耀荣,彭学军,贺春平.湘南中生代火山岩中尖晶石二辉橄榄岩包体 Sm-Nd等时线年龄及地质意义[J].地质论评,2004,50(2):180-183. |
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| 作者姓名： | 陈必河 贾宝华 刘耀荣 彭学军 贺春平 |
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| 作者单位： | 湖南地质调查研究院,湘潭,411100;湖南地质调查研究院,湘潭,411100;湖南地质调查研究院,湘潭,411100;湖南地质调查研究院,湘潭,411100;湖南地质调查研究院,湘潭,411100 |
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| 基金项目： | 国土资源部中国地质调查局1:25万道县幅区域地质调查项目(编号2001130000012)资助的成果 |
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| 摘 要： | 湖南宁远太阳山中生代玄武质火山岩内,产较丰富的尖晶石二辉橄榄岩包体。包体经人工碎样,镜下挑选了含铬尖晶石、镁橄榄石、含铬透辉石、斜方辉石、全岩5个样品,由国土资源部天津地质矿产研究所同位素室测试,得出 Sm-Nd全岩-单矿物等时线同位素年龄2702±19 Ma。进而根据测试结果和以往资料综合分析,认为华南陆块岩石圈是沿垂向演化增生的,由下往上依次为:上地幔岩垫托、结晶基底、褶皱基底、褶皱盖层、沉积盖层5个构造层。其中,上地幔岩起着底板垫托作用,形成于新太古代,为该地区最古老岩石。
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| 关 键 词： | 包体 尖晶石二辉橄榄岩 同位素年龄 湘南 |
Sm-Nd Isochron Age of Spinel-Lherzolite Xenoliths from Mesozoic Volcanic Rocks in the South Hunan and Its Geological Significance |
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| CHEN Bihe,JIA Baohu,LIU Yaorong,PENG Xuejun,HE ChunpingHunan Insitute of Geological Survey,Xiangtan.Sm-Nd Isochron Age of Spinel-Lherzolite Xenoliths from Mesozoic Volcanic Rocks in the South Hunan and Its Geological Significance[J].Geological Review,2004,50(2):180-183. |
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| Authors: | CHEN Bihe JIA Baohu LIU Yaorong PENG Xuejun HE ChunpingHunan Insitute of Geological Survey Xiangtan |
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| Abstract: | There are a lot of spinel-lherzolite xenoliths in the Taiyangshan Mesozoic basalt in Ningyuan, Hunan province. Five samples of chrome spinel, forsterite, chrome-diopside, orthorhombic and whole rock were picked out under microscope from the brocken pieces, were analysesed in the Isochronology Center, Tianjin Institute of Geology and Mineral Resouces, Geological Survey of China. A Sm-Nd whole rock-single mineral isochron age of 2702 + 19 Ma was got. According to this result and having synthesized the data others got before, writers consider the lithosphere of southern China was vertically multiplicated. From bottom upward in order: upper mantle mat, crystallized basement, folded basement, folded cover and sedimentary cover. Among five structural layers, upper mantle rock plays a role of motherboard oushion, was formed at Neoarchaeoid is the oldest rock in this district. |
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| Keywords: | xenoliths spinel-lherzolite isotopic age South Hunan |
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