| 西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩:新特提斯洋内俯冲体系的记录? |
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| 引用本文： | 许荣科,郑有业,冯庆来,陕亮,魏俊浩,张翔,张刚阳,马国桃,庞迎春.西藏札达县夏浦沟的放射虫硅质岩和岛弧火山岩:新特提斯洋内俯冲体系的记录?[J].地球科学,2009(6). |
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| 作者姓名： | 许荣科 郑有业 冯庆来 陕亮 魏俊浩 张翔 张刚阳 马国桃 庞迎春 |
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| 作者单位： | 中国地质大学资源学院;中国地质大学地质过程与矿产资源国家重点实验室;中国地调局发展研究中心;甘肃地勘局第二地质勘查院;成都地质矿产研究所; |
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| 基金项目： | 国家科技支撑计划(No.2006BAB01A04); 国家重点基础研究发展计划(No.2002CB412610); 教育部重大项目(No.308018); 中国地调局国土资源大调查项目(Nos.200210200001,1212010531504) |
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| 摘 要： | 在西藏阿里地区夏浦沟野外调查发现放射虫硅质岩、熔岩组合.放射虫硅质岩SiO2含量在89.47%～92.94%之间,Si/Al在43～67之间,Al/(Al+Fe+Mn)比值在0.68～0.74之间,MnO/TiO2平均比值为0.60,Ce/Ce*平均值为0.89,LaN/CeN平均值1.09,指示它位于洋盆和大陆边缘过渡的环境,总体更接近大陆边缘环境.伴生的火山熔岩以安山质为主,具低TiO2(0.75%～0.98%)、轻稀土弱富集和源自板片流体的易溶元素如Ba、U、Pb相对轻稀土富集,亏损高场强元素(HFSE)Nb、Ta、Ti等,指示形成于岛弧环境,很可能是中生代新特提斯洋洋内俯冲系统的组分.放射虫动物群主要包括Alievium cf.regulare、Alievium cf.fatuum、Archaeospon goprunum cf.patricki、Archaeodictyi mitra mitra Dumitrica等早白垩世分子,其提供了岛弧活动时间上限的约束.
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| 关 键 词： | 白垩纪 放射虫 硅质岩 岩石学 岛弧 夏浦沟 雅鲁藏布江缝合带 |
Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet:Records of Neo-Tethys Intra-Oceanic Subduction System? |
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| XU Rong-ke,ZHENG You-ye,FENG Qing-lai,SHAN Liang,WEI Jun-hao,ZHANG Xiang,ZHANG Gang-yang,MA Guo-tao,PANG Ying-chun.Faculty of Earth Resources,China University of Geosciences,Wuhan,China.State Key Laboratory of Geological Processes , Mineral Resources,China.Development , Research Center of China Geological Survey,Beijing,China.Second Geological , Mineral Exploration Institute of Gansu Province,Lanzhou,China.Chengdu Institute ....Radiolarian Chert and Island-Arc Volcanic Rocks in Xiapugou Tibet:Records of Neo-Tethys Intra-Oceanic Subduction System?[J].Earth Science-Journal of China University of Geosciences,2009(6). |
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| Authors: | XU Rong-ke ZHENG You-ye FENG Qing-lai SHAN Liang WEI Jun-hao ZHANG Xiang ZHANG Gang-yang MA Guo-tao PANG Ying-chunFaculty of Earth Resources China University of Geosciences Wuhan ChinaState Key Laboratory of Geological Processes Mineral Resources ChinaDevelopment Research Center of China Geological Survey Beijing ChinaSecond Geological Mineral Exploration Institute of Gansu Province Lanzhou ChinaChengdu Institute |
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| Institution: | XU Rong-ke1,ZHENG You-ye1,2,FENG Qing-lai2,SHAN Liang3,WEI Jun-hao1,ZHANG Xiang4,ZHANG Gang-yang1,MA Guo-tao5,PANG Ying-chun11.Faculty of Earth Resources,China University of Geosciences,Wuhan430074,China2.State Key Laboratory of Geological Processes and Mineral Resources,China3.Development and Research Center of China Geological Survey,Beijing100037,China4.Second Geological and Mineral Exploration Institute of Gansu Province,Lanzhou730045,China5.Chengdu Institute ... |
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| Abstract: | The stratigraphic units composed of radiolarian chert and lava were found in Xiapugou in western of Yarlung Zangbo Suture Zone during the 1/250000 field geology survey. The radiolarian cherts are characterized by SiO2 ranging from 89.47 to 92.94%,Si/ Al ratio ranging from 43 to 67,Al/(Al+Fe+Mn) ratio from 0.68 to 0.74,The average MnO/TiO2,Ce/Ce* and LaN/CeN ratio is 0.60,0.89 and 1.09,which indicates the radiolarian chert was formed in transitional environment between continental margin basin and the oceani... |
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| Keywords: | Cretaceous radiolarian chert lithology island arc Xiapugou Yarlung Zangbo Suture Zone |
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