| 西藏拉萨达孜侏罗统叶巴组火山角砾凝灰岩中波痕的发现及意义 |
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| 引用本文： | 江宇,刘明明,孙春卫,杨玉堂,陈伟乐,索朗群培.西藏拉萨达孜侏罗统叶巴组火山角砾凝灰岩中波痕的发现及意义[J].西藏大学学报,2012(5):43-46. |
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| 作者姓名： | 江宇 刘明明 孙春卫 杨玉堂 陈伟乐 索朗群培 |
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| 作者单位： | 西藏大学工学院,西藏拉萨850000 |
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| 基金项目： | 2012年度西藏自治区大学生创新性实验训练计划项目“西藏拉萨市夺底沟—哲蚌寺一带壶穴成因探讨”阶段性成果,项目号：2011CX041 |
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| 摘 要： | 文章分析了西藏拉萨达孜侏罗统叶巴组火山角砾凝灰岩的地质背景、波痕及寄主地层特征。结果显示,西藏拉萨达孜叶巴组为一套中酸性火山岩及火山碎屑岩为主的岩石组合,其地球化学特征证实为岛弧环境,其中段火山角砾凝灰岩中发现波痕,波长介于165-235cm,波高约20-30cm,为具宽阔的不对称浪成波痕,其古流向为SSE,形成于滨岸地带。
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| 关 键 词： | 叶巴组 波痕 火山角砾凝灰岩 滨岸沉积 |
Discovery and significance of Ripple Marks in volcanic breccias of Yeba Formation in Jurassic in Lhasa, Tibet |
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| Institution: | Jiang-yu Liu, Ming-ming, Sun Chun-wei, Yang Yu-tang ,Chen Wei-le, Suolang-Qunpei(School of Engineering,Tibet University,Lhasa 850000,Tibet) |
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| Abstract: | In the present paper,the geographical background of ripple mark and Early Jurassic Yeba Formation in Dazi,Lhasa.The result showed that the Yeba Formation is composed of intermediate-acid volcanic rock and volcanic breccias and it formed in island arc settings.The ripple marks was discovered in volcanic breccias of Yeba Formation with wavelength between 160 and 235 cm and about 20-30 cm of height,and is a broad asymmetric ripples,it＇s ancient flow direction was SSE and Formed at a transgresive sedimentary area. |
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| Keywords: | Yeba formation Ripple marks Volcanic breccias Transgresive deposition |
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